Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/utils/cborutil.py @ 49004:f254fc73d956

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global: bulk replace simple pycompat.iteritems(x) with x.items() pycompat.iteritems() just calls .items(). This commit applies a regular expression search and replace to convert simple instances of pycompat.iteritems() with .items(). There are still a handful of calls to pycompat.iteritems() remaining. But these all have more complicated expressions that I wasn't comfortable performing an automated replace on. In addition, some simple replacements were withheld because they broke pytype. These will be handled by their own changesets. Differential Revision: https://phab.mercurial-scm.org/D12318
author Gregory Szorc <gregory.szorc@gmail.com>
date Thu, 03 Mar 2022 18:28:30 -0800
parents 6000f5b25c9b
children 176f1a0d15dc
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1 # cborutil.py - CBOR extensions
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2 #
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8
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9 import struct
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10 import sys
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11
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12 from .. import pycompat
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13
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14 # Very short very of RFC 7049...
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15 #
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16 # Each item begins with a byte. The 3 high bits of that byte denote the
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17 # "major type." The lower 5 bits denote the "subtype." Each major type
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18 # has its own encoding mechanism.
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19 #
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20 # Most types have lengths. However, bytestring, string, array, and map
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21 # can be indefinite length. These are denotes by a subtype with value 31.
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22 # Sub-components of those types then come afterwards and are terminated
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23 # by a "break" byte.
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24
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25 MAJOR_TYPE_UINT = 0
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26 MAJOR_TYPE_NEGINT = 1
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27 MAJOR_TYPE_BYTESTRING = 2
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28 MAJOR_TYPE_STRING = 3
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29 MAJOR_TYPE_ARRAY = 4
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30 MAJOR_TYPE_MAP = 5
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31 MAJOR_TYPE_SEMANTIC = 6
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32 MAJOR_TYPE_SPECIAL = 7
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33
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34 SUBTYPE_MASK = 0b00011111
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35
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36 SUBTYPE_FALSE = 20
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37 SUBTYPE_TRUE = 21
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38 SUBTYPE_NULL = 22
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39 SUBTYPE_HALF_FLOAT = 25
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40 SUBTYPE_SINGLE_FLOAT = 26
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41 SUBTYPE_DOUBLE_FLOAT = 27
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42 SUBTYPE_INDEFINITE = 31
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43
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44 SEMANTIC_TAG_FINITE_SET = 258
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45
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46 # Indefinite types begin with their major type ORd with information value 31.
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47 BEGIN_INDEFINITE_BYTESTRING = struct.pack(
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48 '>B', MAJOR_TYPE_BYTESTRING << 5 | SUBTYPE_INDEFINITE
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49 )
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50 BEGIN_INDEFINITE_ARRAY = struct.pack(
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51 '>B', MAJOR_TYPE_ARRAY << 5 | SUBTYPE_INDEFINITE
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52 )
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53 BEGIN_INDEFINITE_MAP = struct.pack(
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54 '>B', MAJOR_TYPE_MAP << 5 | SUBTYPE_INDEFINITE
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55 )
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56
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57 ENCODED_LENGTH_1 = struct.Struct('>B')
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58 ENCODED_LENGTH_2 = struct.Struct('>BB')
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59 ENCODED_LENGTH_3 = struct.Struct('>BH')
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60 ENCODED_LENGTH_4 = struct.Struct('>BL')
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61 ENCODED_LENGTH_5 = struct.Struct('>BQ')
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62
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63 # The break ends an indefinite length item.
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64 BREAK = b'\xff'
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65 BREAK_INT = 255
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66
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67
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68 def encodelength(majortype, length):
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69 """Obtain a value encoding the major type and its length."""
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70 if length < 24:
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71 return ENCODED_LENGTH_1.pack(majortype << 5 | length)
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72 elif length < 256:
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73 return ENCODED_LENGTH_2.pack(majortype << 5 | 24, length)
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74 elif length < 65536:
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75 return ENCODED_LENGTH_3.pack(majortype << 5 | 25, length)
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76 elif length < 4294967296:
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77 return ENCODED_LENGTH_4.pack(majortype << 5 | 26, length)
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78 else:
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79 return ENCODED_LENGTH_5.pack(majortype << 5 | 27, length)
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80
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81
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82 def streamencodebytestring(v):
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83 yield encodelength(MAJOR_TYPE_BYTESTRING, len(v))
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84 yield v
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86
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87 def streamencodebytestringfromiter(it):
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88 """Convert an iterator of chunks to an indefinite bytestring.
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89
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90 Given an input that is iterable and each element in the iterator is
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91 representable as bytes, emit an indefinite length bytestring.
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92 """
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93 yield BEGIN_INDEFINITE_BYTESTRING
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94
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95 for chunk in it:
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96 yield encodelength(MAJOR_TYPE_BYTESTRING, len(chunk))
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97 yield chunk
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98
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99 yield BREAK
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101
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102 def streamencodeindefinitebytestring(source, chunksize=65536):
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103 """Given a large source buffer, emit as an indefinite length bytestring.
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104
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105 This is a generator of chunks constituting the encoded CBOR data.
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106 """
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107 yield BEGIN_INDEFINITE_BYTESTRING
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108
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109 i = 0
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110 l = len(source)
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111
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112 while True:
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113 chunk = source[i : i + chunksize]
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114 i += len(chunk)
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115
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116 yield encodelength(MAJOR_TYPE_BYTESTRING, len(chunk))
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117 yield chunk
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118
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119 if i >= l:
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120 break
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121
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122 yield BREAK
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123
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124
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125 def streamencodeint(v):
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126 if v >= 18446744073709551616 or v < -18446744073709551616:
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127 raise ValueError(b'big integers not supported')
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128
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129 if v >= 0:
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
130 yield encodelength(MAJOR_TYPE_UINT, v)
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
131 else:
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
132 yield encodelength(MAJOR_TYPE_NEGINT, abs(v) - 1)
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
133
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
134
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
135 def streamencodearray(l):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
136 """Encode a known size iterable to an array."""
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
137
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
138 yield encodelength(MAJOR_TYPE_ARRAY, len(l))
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 for i in l:
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
141 for chunk in streamencode(i):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
142 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
143
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
144
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
145 def streamencodearrayfromiter(it):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
146 """Encode an iterator of items to an indefinite length array."""
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148 yield BEGIN_INDEFINITE_ARRAY
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 for i in it:
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
151 for chunk in streamencode(i):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
152 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
153
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
154 yield BREAK
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
155
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
156
37942
2ae6a3134362 cborutil: port to Python 3
Augie Fackler <augie@google.com>
parents: 37711
diff changeset
157 def _mixedtypesortkey(v):
2ae6a3134362 cborutil: port to Python 3
Augie Fackler <augie@google.com>
parents: 37711
diff changeset
158 return type(v).__name__, v
2ae6a3134362 cborutil: port to Python 3
Augie Fackler <augie@google.com>
parents: 37711
diff changeset
159
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
160
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
161 def streamencodeset(s):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162 # https://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml defines
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
163 # semantic tag 258 for finite sets.
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
164 yield encodelength(MAJOR_TYPE_SEMANTIC, SEMANTIC_TAG_FINITE_SET)
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
165
37942
2ae6a3134362 cborutil: port to Python 3
Augie Fackler <augie@google.com>
parents: 37711
diff changeset
166 for chunk in streamencodearray(sorted(s, key=_mixedtypesortkey)):
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
168
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
169
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
170 def streamencodemap(d):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
171 """Encode dictionary to a generator.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
172
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
173 Does not supporting indefinite length dictionaries.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
174 """
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
175 yield encodelength(MAJOR_TYPE_MAP, len(d))
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
176
49004
f254fc73d956 global: bulk replace simple pycompat.iteritems(x) with x.items()
Gregory Szorc <gregory.szorc@gmail.com>
parents: 48966
diff changeset
177 for key, value in sorted(d.items(), key=lambda x: _mixedtypesortkey(x[0])):
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
178 for chunk in streamencode(key):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
180 for chunk in streamencode(value):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
181 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
183
37711
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
184 def streamencodemapfromiter(it):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185 """Given an iterable of (key, value), encode to an indefinite length map."""
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
186 yield BEGIN_INDEFINITE_MAP
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
188 for key, value in it:
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
189 for chunk in streamencode(key):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
190 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
191 for chunk in streamencode(value):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
192 yield chunk
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
193
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
194 yield BREAK
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
195
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
196
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
197 def streamencodebool(b):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
198 # major type 7, simple value 20 and 21.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
199 yield b'\xf5' if b else b'\xf4'
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
200
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
201
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
202 def streamencodenone(v):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
203 # major type 7, simple value 22.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
204 yield b'\xf6'
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
205
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
206
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
207 STREAM_ENCODERS = {
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
208 bytes: streamencodebytestring,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
209 int: streamencodeint,
39473
8d858fbf2759 cbor: teach the encoder to handle python `long` type for Windows
Matt Harbison <matt_harbison@yahoo.com>
parents: 39440
diff changeset
210 pycompat.long: streamencodeint,
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
211 list: streamencodearray,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
212 tuple: streamencodearray,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
213 dict: streamencodemap,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
214 set: streamencodeset,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
215 bool: streamencodebool,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
216 type(None): streamencodenone,
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
217 }
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
218
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
219
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
220 def streamencode(v):
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
221 """Encode a value in a streaming manner.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
222
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
223 Given an input object, encode it to CBOR recursively.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
224
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
225 Returns a generator of CBOR encoded bytes. There is no guarantee
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
226 that each emitted chunk fully decodes to a value or sub-value.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
227
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
228 Encoding is deterministic - unordered collections are sorted.
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
229 """
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
230 fn = STREAM_ENCODERS.get(v.__class__)
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
232 if not fn:
42176
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
233 # handle subtypes such as encoding.localstr and util.sortdict
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
234 for ty in STREAM_ENCODERS:
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
235 if not isinstance(v, ty):
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
236 continue
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
237 fn = STREAM_ENCODERS[ty]
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
238 break
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
239
b6387a65851d cborutil: fix streamencode() to handle subtypes
Yuya Nishihara <yuya@tcha.org>
parents: 40125
diff changeset
240 if not fn:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
241 raise ValueError(b'do not know how to encode %s' % type(v))
37711
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
242
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
243 return fn(v)
65a23cc8e75b cborutil: implement support for streaming encoding, bytestring decoding
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
244
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
245
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
246 class CBORDecodeError(Exception):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
247 """Represents an error decoding CBOR."""
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
248
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
249
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
250 if sys.version_info.major >= 3:
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
251
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
252 def _elementtointeger(b, i):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
253 return b[i]
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
254
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
255
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
256 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
257
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
258 def _elementtointeger(b, i):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
259 return ord(b[i])
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
260
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
261
43554
9f70512ae2cf cleanup: remove pointless r-prefixes on single-quoted strings
Augie Fackler <augie@google.com>
parents: 43117
diff changeset
262 STRUCT_BIG_UBYTE = struct.Struct('>B')
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
263 STRUCT_BIG_USHORT = struct.Struct(b'>H')
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
264 STRUCT_BIG_ULONG = struct.Struct(b'>L')
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
265 STRUCT_BIG_ULONGLONG = struct.Struct(b'>Q')
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
266
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
267 SPECIAL_NONE = 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
268 SPECIAL_START_INDEFINITE_BYTESTRING = 1
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269 SPECIAL_START_ARRAY = 2
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270 SPECIAL_START_MAP = 3
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271 SPECIAL_START_SET = 4
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272 SPECIAL_INDEFINITE_BREAK = 5
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273
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274
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275 def decodeitem(b, offset=0):
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276 """Decode a new CBOR value from a buffer at offset.
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277
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278 This function attempts to decode up to one complete CBOR value
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diff changeset
279 from ``b`` starting at offset ``offset``.
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280
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281 The beginning of a collection (such as an array, map, set, or
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diff changeset
282 indefinite length bytestring) counts as a single value. For these
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diff changeset
283 special cases, a state flag will indicate that a special value was seen.
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284
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285 When called, the function either returns a decoded value or gives
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
286 a hint as to how many more bytes are needed to do so. By calling
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diff changeset
287 the function repeatedly given a stream of bytes, the caller can
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diff changeset
288 build up the original values.
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289
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290 Returns a tuple with the following elements:
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291
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292 * Bool indicating whether a complete value was decoded.
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293 * A decoded value if first value is True otherwise None
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294 * Integer number of bytes. If positive, the number of bytes
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diff changeset
295 read. If negative, the number of bytes we need to read to
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296 decode this value or the next chunk in this value.
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297 * One of the ``SPECIAL_*`` constants indicating special treatment
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298 for this value. ``SPECIAL_NONE`` means this is a fully decoded
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299 simple value (such as an integer or bool).
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300 """
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301
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302 initial = _elementtointeger(b, offset)
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303 offset += 1
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304
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305 majortype = initial >> 5
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306 subtype = initial & SUBTYPE_MASK
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307
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diff changeset
308 if majortype == MAJOR_TYPE_UINT:
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diff changeset
309 complete, value, readcount = decodeuint(subtype, b, offset)
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310
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diff changeset
311 if complete:
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312 return True, value, readcount + 1, SPECIAL_NONE
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diff changeset
313 else:
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314 return False, None, readcount, SPECIAL_NONE
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315
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diff changeset
316 elif majortype == MAJOR_TYPE_NEGINT:
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diff changeset
317 # Negative integers are the same as UINT except inverted minus 1.
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diff changeset
318 complete, value, readcount = decodeuint(subtype, b, offset)
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diff changeset
319
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diff changeset
320 if complete:
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diff changeset
321 return True, -value - 1, readcount + 1, SPECIAL_NONE
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diff changeset
322 else:
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323 return False, None, readcount, SPECIAL_NONE
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diff changeset
324
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diff changeset
325 elif majortype == MAJOR_TYPE_BYTESTRING:
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diff changeset
326 # Beginning of bytestrings are treated as uints in order to
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diff changeset
327 # decode their length, which may be indefinite.
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328 complete, size, readcount = decodeuint(
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329 subtype, b, offset, allowindefinite=True
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diff changeset
330 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
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331
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
332 # We don't know the size of the bytestring. It must be a definitive
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diff changeset
333 # length since the indefinite subtype would be encoded in the initial
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diff changeset
334 # byte.
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
335 if not complete:
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336 return False, None, readcount, SPECIAL_NONE
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diff changeset
337
aeb551a3bb8a cborutil: implement sans I/O decoder
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338 # We know the length of the bytestring.
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diff changeset
339 if size is not None:
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diff changeset
340 # And the data is available in the buffer.
aeb551a3bb8a cborutil: implement sans I/O decoder
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341 if offset + readcount + size <= len(b):
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diff changeset
342 value = b[offset + readcount : offset + readcount + size]
39438
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diff changeset
343 return True, value, readcount + size + 1, SPECIAL_NONE
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diff changeset
344
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
345 # And we need more data in order to return the bytestring.
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diff changeset
346 else:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
347 wanted = len(b) - offset - readcount - size
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diff changeset
348 return False, None, wanted, SPECIAL_NONE
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diff changeset
349
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350 # It is an indefinite length bytestring.
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diff changeset
351 else:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
352 return True, None, 1, SPECIAL_START_INDEFINITE_BYTESTRING
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
353
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
354 elif majortype == MAJOR_TYPE_STRING:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
355 raise CBORDecodeError(b'string major type not supported')
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
356
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
357 elif majortype == MAJOR_TYPE_ARRAY:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
358 # Beginning of arrays are treated as uints in order to decode their
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
359 # length. We don't allow indefinite length arrays.
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
360 complete, size, readcount = decodeuint(subtype, b, offset)
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
361
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
362 if complete:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
363 return True, size, readcount + 1, SPECIAL_START_ARRAY
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
364 else:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
365 return False, None, readcount, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
366
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
367 elif majortype == MAJOR_TYPE_MAP:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
368 # Beginning of maps are treated as uints in order to decode their
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
369 # number of elements. We don't allow indefinite length arrays.
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
370 complete, size, readcount = decodeuint(subtype, b, offset)
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
371
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
372 if complete:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
373 return True, size, readcount + 1, SPECIAL_START_MAP
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
374 else:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
375 return False, None, readcount, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
376
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
377 elif majortype == MAJOR_TYPE_SEMANTIC:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
378 # Semantic tag value is read the same as a uint.
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
379 complete, tagvalue, readcount = decodeuint(subtype, b, offset)
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
380
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
381 if not complete:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
382 return False, None, readcount, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
383
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
384 # This behavior here is a little wonky. The main type being "decorated"
aeb551a3bb8a cborutil: implement sans I/O decoder
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parents: 37942
diff changeset
385 # by this semantic tag follows. A more robust parser would probably emit
aeb551a3bb8a cborutil: implement sans I/O decoder
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parents: 37942
diff changeset
386 # a special flag indicating this as a semantic tag and let the caller
aeb551a3bb8a cborutil: implement sans I/O decoder
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parents: 37942
diff changeset
387 # deal with the types that follow. But since we don't support many
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
388 # semantic tags, it is easier to deal with the special cases here and
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
389 # hide complexity from the caller. If we add support for more semantic
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
390 # tags, we should probably move semantic tag handling into the caller.
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
391 if tagvalue == SEMANTIC_TAG_FINITE_SET:
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diff changeset
392 if offset + readcount >= len(b):
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
393 return False, None, -1, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
394
43076
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parents: 42176
diff changeset
395 complete, size, readcount2, special = decodeitem(
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
396 b, offset + readcount
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
397 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
398
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
399 if not complete:
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
400 return False, None, readcount2, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
401
aeb551a3bb8a cborutil: implement sans I/O decoder
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diff changeset
402 if special != SPECIAL_START_ARRAY:
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
403 raise CBORDecodeError(
43117
8ff1ecfadcd1 cleanup: join string literals that are already on one line
Martin von Zweigbergk <martinvonz@google.com>
parents: 43106
diff changeset
404 b'expected array after finite set semantic tag'
43076
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Augie Fackler <augie@google.com>
parents: 42176
diff changeset
405 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
406
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
407 return True, size, readcount + readcount2 + 1, SPECIAL_START_SET
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
408
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
409 else:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
410 raise CBORDecodeError(b'semantic tag %d not allowed' % tagvalue)
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
411
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
412 elif majortype == MAJOR_TYPE_SPECIAL:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
413 # Only specific values for the information field are allowed.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
414 if subtype == SUBTYPE_FALSE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
415 return True, False, 1, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
416 elif subtype == SUBTYPE_TRUE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
417 return True, True, 1, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
418 elif subtype == SUBTYPE_NULL:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
419 return True, None, 1, SPECIAL_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
420 elif subtype == SUBTYPE_INDEFINITE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
421 return True, None, 1, SPECIAL_INDEFINITE_BREAK
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
422 # If value is 24, subtype is in next byte.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
423 else:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
424 raise CBORDecodeError(b'special type %d not allowed' % subtype)
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
425 else:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
426 assert False
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
427
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
428
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
429 def decodeuint(subtype, b, offset=0, allowindefinite=False):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
430 """Decode an unsigned integer.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
431
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
432 ``subtype`` is the lower 5 bits from the initial byte CBOR item
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
433 "header." ``b`` is a buffer containing bytes. ``offset`` points to
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
434 the index of the first byte after the byte that ``subtype`` was
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
435 derived from.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
436
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
437 ``allowindefinite`` allows the special indefinite length value
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
438 indicator.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
439
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
440 Returns a 3-tuple of (successful, value, count).
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
441
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
442 The first element is a bool indicating if decoding completed. The 2nd
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
443 is the decoded integer value or None if not fully decoded or the subtype
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
444 is 31 and ``allowindefinite`` is True. The 3rd value is the count of bytes.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
445 If positive, it is the number of additional bytes decoded. If negative,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
446 it is the number of additional bytes needed to decode this value.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
447 """
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
448
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
449 # Small values are inline.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
450 if subtype < 24:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
451 return True, subtype, 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
452 # Indefinite length specifier.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
453 elif subtype == 31:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
454 if allowindefinite:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
455 return True, None, 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
456 else:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
457 raise CBORDecodeError(b'indefinite length uint not allowed here')
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
458 elif subtype >= 28:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
459 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
460 b'unsupported subtype on integer type: %d' % subtype
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
461 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
462
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
463 if subtype == 24:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
464 s = STRUCT_BIG_UBYTE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
465 elif subtype == 25:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
466 s = STRUCT_BIG_USHORT
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
467 elif subtype == 26:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
468 s = STRUCT_BIG_ULONG
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
469 elif subtype == 27:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
470 s = STRUCT_BIG_ULONGLONG
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
471 else:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
472 raise CBORDecodeError(b'bounds condition checking violation')
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
473
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
474 if len(b) - offset >= s.size:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
475 return True, s.unpack_from(b, offset)[0], s.size
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
476 else:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
477 return False, None, len(b) - offset - s.size
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
478
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
479
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
480 class bytestringchunk(bytes):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
481 """Represents a chunk/segment in an indefinite length bytestring.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
482
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
483 This behaves like a ``bytes`` but in addition has the ``isfirst``
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
484 and ``islast`` attributes indicating whether this chunk is the first
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
485 or last in an indefinite length bytestring.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
486 """
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
487
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
488 def __new__(cls, v, first=False, last=False):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
489 self = bytes.__new__(cls, v)
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
490 self.isfirst = first
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
491 self.islast = last
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
492
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
493 return self
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
494
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
495
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
496 class sansiodecoder(object):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
497 """A CBOR decoder that doesn't perform its own I/O.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
498
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
499 To use, construct an instance and feed it segments containing
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
500 CBOR-encoded bytes via ``decode()``. The return value from ``decode()``
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
501 indicates whether a fully-decoded value is available, how many bytes
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
502 were consumed, and offers a hint as to how many bytes should be fed
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
503 in next time to decode the next value.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
504
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
505 The decoder assumes it will decode N discrete CBOR values, not just
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
506 a single value. i.e. if the bytestream contains uints packed one after
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
507 the other, the decoder will decode them all, rather than just the initial
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
508 one.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
509
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
510 When ``decode()`` indicates a value is available, call ``getavailable()``
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
511 to return all fully decoded values.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
512
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
513 ``decode()`` can partially decode input. It is up to the caller to keep
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
514 track of what data was consumed and to pass unconsumed data in on the
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
515 next invocation.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
516
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
517 The decoder decodes atomically at the *item* level. See ``decodeitem()``.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
518 If an *item* cannot be fully decoded, the decoder won't record it as
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
519 partially consumed. Instead, the caller will be instructed to pass in
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
520 the initial bytes of this item on the next invocation. This does result
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
521 in some redundant parsing. But the overhead should be minimal.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
522
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
523 This decoder only supports a subset of CBOR as required by Mercurial.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
524 It lacks support for:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
525
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
526 * Indefinite length arrays
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
527 * Indefinite length maps
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
528 * Use of indefinite length bytestrings as keys or values within
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
529 arrays, maps, or sets.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
530 * Nested arrays, maps, or sets within sets
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
531 * Any semantic tag that isn't a mathematical finite set
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
532 * Floating point numbers
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
533 * Undefined special value
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
534
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
535 CBOR types are decoded to Python types as follows:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
536
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
537 uint -> int
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
538 negint -> int
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
539 bytestring -> bytes
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
540 map -> dict
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
541 array -> list
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
542 True -> bool
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
543 False -> bool
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
544 null -> None
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
545 indefinite length bytestring chunk -> [bytestringchunk]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
546
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
547 The only non-obvious mapping here is an indefinite length bytestring
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
548 to the ``bytestringchunk`` type. This is to facilitate streaming
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
549 indefinite length bytestrings out of the decoder and to differentiate
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
550 a regular bytestring from an indefinite length bytestring.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
551 """
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
552
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
553 _STATE_NONE = 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
554 _STATE_WANT_MAP_KEY = 1
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
555 _STATE_WANT_MAP_VALUE = 2
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
556 _STATE_WANT_ARRAY_VALUE = 3
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
557 _STATE_WANT_SET_VALUE = 4
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
558 _STATE_WANT_BYTESTRING_CHUNK_FIRST = 5
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
559 _STATE_WANT_BYTESTRING_CHUNK_SUBSEQUENT = 6
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
560
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
561 def __init__(self):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
562 # TODO add support for limiting size of bytestrings
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
563 # TODO add support for limiting number of keys / values in collections
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
564 # TODO add support for limiting size of buffered partial values
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
565
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
566 self.decodedbytecount = 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
567
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
568 self._state = self._STATE_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
569
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
570 # Stack of active nested collections. Each entry is a dict describing
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
571 # the collection.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
572 self._collectionstack = []
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
573
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
574 # Fully decoded key to use for the current map.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
575 self._currentmapkey = None
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
576
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
577 # Fully decoded values available for retrieval.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
578 self._decodedvalues = []
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
579
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
580 @property
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
581 def inprogress(self):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
582 """Whether the decoder has partially decoded a value."""
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
583 return self._state != self._STATE_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
584
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
585 def decode(self, b, offset=0):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
586 """Attempt to decode bytes from an input buffer.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
587
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
588 ``b`` is a collection of bytes and ``offset`` is the byte
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
589 offset within that buffer from which to begin reading data.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
590
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
591 ``b`` must support ``len()`` and accessing bytes slices via
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
592 ``__slice__``. Typically ``bytes`` instances are used.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
593
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
594 Returns a tuple with the following fields:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
595
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
596 * Bool indicating whether values are available for retrieval.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
597 * Integer indicating the number of bytes that were fully consumed,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
598 starting from ``offset``.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
599 * Integer indicating the number of bytes that are desired for the
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
600 next call in order to decode an item.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
601 """
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
602 if not b:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
603 return bool(self._decodedvalues), 0, 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
604
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
605 initialoffset = offset
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
606
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
607 # We could easily split the body of this loop into a function. But
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
608 # Python performance is sensitive to function calls and collections
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
609 # are composed of many items. So leaving as a while loop could help
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
610 # with performance. One thing that may not help is the use of
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
611 # if..elif versus a lookup/dispatch table. There may be value
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
612 # in switching that.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
613 while offset < len(b):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
614 # Attempt to decode an item. This could be a whole value or a
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
615 # special value indicating an event, such as start or end of a
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
616 # collection or indefinite length type.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
617 complete, value, readcount, special = decodeitem(b, offset)
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
618
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
619 if readcount > 0:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
620 self.decodedbytecount += readcount
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
621
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
622 if not complete:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
623 assert readcount < 0
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
624 return (
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
625 bool(self._decodedvalues),
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
626 offset - initialoffset,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
627 -readcount,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
628 )
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
629
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
630 offset += readcount
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
631
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
632 # No nested state. We either have a full value or beginning of a
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
633 # complex value to deal with.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
634 if self._state == self._STATE_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
635 # A normal value.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
636 if special == SPECIAL_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
637 self._decodedvalues.append(value)
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
638
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
639 elif special == SPECIAL_START_ARRAY:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
640 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
641 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
642 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
643 b'v': [],
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
644 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
645 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
646 self._state = self._STATE_WANT_ARRAY_VALUE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
647
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
648 elif special == SPECIAL_START_MAP:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
649 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
650 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
651 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
652 b'v': {},
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
653 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
654 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
655 self._state = self._STATE_WANT_MAP_KEY
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
656
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
657 elif special == SPECIAL_START_SET:
43076
2372284d9457 formatting: blacken the codebase
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parents: 42176
diff changeset
658 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
659 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
660 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
661 b'v': set(),
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
662 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
663 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
664 self._state = self._STATE_WANT_SET_VALUE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
665
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
666 elif special == SPECIAL_START_INDEFINITE_BYTESTRING:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
667 self._state = self._STATE_WANT_BYTESTRING_CHUNK_FIRST
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
668
aeb551a3bb8a cborutil: implement sans I/O decoder
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parents: 37942
diff changeset
669 else:
43076
2372284d9457 formatting: blacken the codebase
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parents: 42176
diff changeset
670 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
671 b'unhandled special state: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
672 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
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parents: 37942
diff changeset
673
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
674 # This value becomes an element of the current array.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
675 elif self._state == self._STATE_WANT_ARRAY_VALUE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
676 # Simple values get appended.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
677 if special == SPECIAL_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
678 c = self._collectionstack[-1]
43077
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parents: 43076
diff changeset
679 c[b'v'].append(value)
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
680 c[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
681
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
682 # self._state doesn't need changed.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
683
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
684 # An array nested within an array.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
685 elif special == SPECIAL_START_ARRAY:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
686 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
687 newvalue = []
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
688
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
689 lastc[b'v'].append(newvalue)
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
690 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
691
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
692 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
693 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
694 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
695 b'v': newvalue,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
696 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
697 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
698
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
699 # self._state doesn't need changed.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
700
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
701 # A map nested within an array.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
702 elif special == SPECIAL_START_MAP:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
703 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
704 newvalue = {}
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
705
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
706 lastc[b'v'].append(newvalue)
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
707 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
708
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
709 self._collectionstack.append(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
710 {b'remaining': value, b'v': newvalue}
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
711 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
712
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
713 self._state = self._STATE_WANT_MAP_KEY
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
714
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
715 elif special == SPECIAL_START_SET:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
716 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
717 newvalue = set()
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
718
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
719 lastc[b'v'].append(newvalue)
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
720 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
721
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
722 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
723 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
724 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
725 b'v': newvalue,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
726 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
727 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
728
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
729 self._state = self._STATE_WANT_SET_VALUE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
730
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
731 elif special == SPECIAL_START_INDEFINITE_BYTESTRING:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
732 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
733 b'indefinite length bytestrings '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
734 b'not allowed as array values'
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
735 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
736
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
737 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
738 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
739 b'unhandled special item when '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
740 b'expecting array value: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
741 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
742
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
743 # This value becomes the key of the current map instance.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
744 elif self._state == self._STATE_WANT_MAP_KEY:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
745 if special == SPECIAL_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
746 self._currentmapkey = value
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
747 self._state = self._STATE_WANT_MAP_VALUE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
748
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
749 elif special == SPECIAL_START_INDEFINITE_BYTESTRING:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
750 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
751 b'indefinite length bytestrings '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
752 b'not allowed as map keys'
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
753 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
754
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
755 elif special in (
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
756 SPECIAL_START_ARRAY,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
757 SPECIAL_START_MAP,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
758 SPECIAL_START_SET,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
759 ):
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
760 raise CBORDecodeError(
43117
8ff1ecfadcd1 cleanup: join string literals that are already on one line
Martin von Zweigbergk <martinvonz@google.com>
parents: 43106
diff changeset
761 b'collections not supported as map keys'
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
762 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
763
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
764 # We do not allow special values to be used as map keys.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
765 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
766 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
767 b'unhandled special item when '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
768 b'expecting map key: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
769 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
770
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
771 # This value becomes the value of the current map key.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
772 elif self._state == self._STATE_WANT_MAP_VALUE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
773 # Simple values simply get inserted into the map.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
774 if special == SPECIAL_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
775 lastc = self._collectionstack[-1]
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
776 lastc[b'v'][self._currentmapkey] = value
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
777 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
778
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
779 self._state = self._STATE_WANT_MAP_KEY
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
780
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
781 # A new array is used as the map value.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
782 elif special == SPECIAL_START_ARRAY:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
783 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
784 newvalue = []
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
785
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
786 lastc[b'v'][self._currentmapkey] = newvalue
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
787 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
788
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
789 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
790 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
791 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
792 b'v': newvalue,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
793 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
794 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
795
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
796 self._state = self._STATE_WANT_ARRAY_VALUE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
797
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
798 # A new map is used as the map value.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
799 elif special == SPECIAL_START_MAP:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
800 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
801 newvalue = {}
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
802
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
803 lastc[b'v'][self._currentmapkey] = newvalue
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
804 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
805
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
806 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
807 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
808 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
809 b'v': newvalue,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
810 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
811 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
812
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
813 self._state = self._STATE_WANT_MAP_KEY
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
814
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
815 # A new set is used as the map value.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
816 elif special == SPECIAL_START_SET:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
817 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
818 newvalue = set()
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
819
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
820 lastc[b'v'][self._currentmapkey] = newvalue
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
821 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
822
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
823 self._collectionstack.append(
45957
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
824 {
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
825 b'remaining': value,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
826 b'v': newvalue,
89a2afe31e82 formating: upgrade to black 20.8b1
Augie Fackler <raf@durin42.com>
parents: 43554
diff changeset
827 }
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
828 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
829
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
830 self._state = self._STATE_WANT_SET_VALUE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
831
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
832 elif special == SPECIAL_START_INDEFINITE_BYTESTRING:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
833 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
834 b'indefinite length bytestrings not '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
835 b'allowed as map values'
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
836 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
837
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
838 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
839 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
840 b'unhandled special item when '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
841 b'expecting map value: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
842 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
843
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
844 self._currentmapkey = None
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
845
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
846 # This value is added to the current set.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
847 elif self._state == self._STATE_WANT_SET_VALUE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
848 if special == SPECIAL_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
849 lastc = self._collectionstack[-1]
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
850 lastc[b'v'].add(value)
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
851 lastc[b'remaining'] -= 1
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
852
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
853 elif special == SPECIAL_START_INDEFINITE_BYTESTRING:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
854 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
855 b'indefinite length bytestrings not '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
856 b'allowed as set values'
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
857 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
858
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
859 elif special in (
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
860 SPECIAL_START_ARRAY,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
861 SPECIAL_START_MAP,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
862 SPECIAL_START_SET,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
863 ):
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
864 raise CBORDecodeError(
43117
8ff1ecfadcd1 cleanup: join string literals that are already on one line
Martin von Zweigbergk <martinvonz@google.com>
parents: 43106
diff changeset
865 b'collections not allowed as set values'
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
866 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
867
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
868 # We don't allow non-trivial types to exist as set values.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
869 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
870 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
871 b'unhandled special item when '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
872 b'expecting set value: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
873 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
874
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
875 # This value represents the first chunk in an indefinite length
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
876 # bytestring.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
877 elif self._state == self._STATE_WANT_BYTESTRING_CHUNK_FIRST:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
878 # We received a full chunk.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
879 if special == SPECIAL_NONE:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
880 self._decodedvalues.append(
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
881 bytestringchunk(value, first=True)
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
882 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
883
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
884 self._state = self._STATE_WANT_BYTESTRING_CHUNK_SUBSEQUENT
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
885
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
886 # The end of stream marker. This means it is an empty
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
887 # indefinite length bytestring.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
888 elif special == SPECIAL_INDEFINITE_BREAK:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
889 # We /could/ convert this to a b''. But we want to preserve
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
890 # the nature of the underlying data so consumers expecting
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
891 # an indefinite length bytestring get one.
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
892 self._decodedvalues.append(
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
893 bytestringchunk(b'', first=True, last=True)
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
894 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
895
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
896 # Since indefinite length bytestrings can't be used in
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
897 # collections, we must be at the root level.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
898 assert not self._collectionstack
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
899 self._state = self._STATE_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
900
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
901 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
902 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
903 b'unexpected special value when '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
904 b'expecting bytestring chunk: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
905 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
906
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
907 # This value represents the non-initial chunk in an indefinite
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
908 # length bytestring.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
909 elif self._state == self._STATE_WANT_BYTESTRING_CHUNK_SUBSEQUENT:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
910 # We received a full chunk.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
911 if special == SPECIAL_NONE:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
912 self._decodedvalues.append(bytestringchunk(value))
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
913
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
914 # The end of stream marker.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
915 elif special == SPECIAL_INDEFINITE_BREAK:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
916 self._decodedvalues.append(bytestringchunk(b'', last=True))
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
917
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
918 # Since indefinite length bytestrings can't be used in
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
919 # collections, we must be at the root level.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
920 assert not self._collectionstack
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
921 self._state = self._STATE_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
922
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
923 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
924 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
925 b'unexpected special value when '
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
926 b'expecting bytestring chunk: %d' % special
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
927 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
928
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
929 else:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
930 raise CBORDecodeError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
931 b'unhandled decoder state: %d' % self._state
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
932 )
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
933
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
934 # We could have just added the final value in a collection. End
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
935 # all complete collections at the top of the stack.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
936 while True:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
937 # Bail if we're not waiting on a new collection item.
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
938 if self._state not in (
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
939 self._STATE_WANT_ARRAY_VALUE,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
940 self._STATE_WANT_MAP_KEY,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
941 self._STATE_WANT_SET_VALUE,
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
942 ):
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
943 break
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
944
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
945 # Or we are expecting more items for this collection.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
946 lastc = self._collectionstack[-1]
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
947
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
948 if lastc[b'remaining']:
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
949 break
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
950
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
951 # The collection at the top of the stack is complete.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
952
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
953 # Discard it, as it isn't needed for future items.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
954 self._collectionstack.pop()
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
955
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
956 # If this is a nested collection, we don't emit it, since it
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
957 # will be emitted by its parent collection. But we do need to
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
958 # update state to reflect what the new top-most collection
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
959 # on the stack is.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
960 if self._collectionstack:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
961 self._state = {
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
962 list: self._STATE_WANT_ARRAY_VALUE,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
963 dict: self._STATE_WANT_MAP_KEY,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
964 set: self._STATE_WANT_SET_VALUE,
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
965 }[type(self._collectionstack[-1][b'v'])]
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
966
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
967 # If this is the root collection, emit it.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
968 else:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
969 self._decodedvalues.append(lastc[b'v'])
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
970 self._state = self._STATE_NONE
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
971
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
972 return (
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
973 bool(self._decodedvalues),
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
974 offset - initialoffset,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
975 0,
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
976 )
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
977
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
978 def getavailable(self):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
979 """Returns an iterator over fully decoded values.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
980
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
981 Once values are retrieved, they won't be available on the next call.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
982 """
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
983
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
984 l = list(self._decodedvalues)
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
985 self._decodedvalues = []
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
986 return l
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
987
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
988
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
989 class bufferingdecoder(object):
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
990 """A CBOR decoder that buffers undecoded input.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
991
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
992 This is a glorified wrapper around ``sansiodecoder`` that adds a buffering
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
993 layer. All input that isn't consumed by ``sansiodecoder`` will be buffered
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
994 and concatenated with any new input that arrives later.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
995
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
996 TODO consider adding limits as to the maximum amount of data that can
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
997 be buffered.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
998 """
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
999
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1000 def __init__(self):
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1001 self._decoder = sansiodecoder()
40031
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1002 self._chunks = []
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1003 self._wanted = 0
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1004
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1005 def decode(self, b):
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1006 """Attempt to decode bytes to CBOR values.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1007
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1008 Returns a tuple with the following fields:
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1009
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1010 * Bool indicating whether new values are available for retrieval.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1011 * Integer number of bytes decoded from the new input.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1012 * Integer number of bytes wanted to decode the next value.
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1013 """
40125
b638219a23c3 cborutil: cast bytearray to bytes
Gregory Szorc <gregory.szorc@gmail.com>
parents: 40031
diff changeset
1014 # We /might/ be able to support passing a bytearray all the
b638219a23c3 cborutil: cast bytearray to bytes
Gregory Szorc <gregory.szorc@gmail.com>
parents: 40031
diff changeset
1015 # way through. For now, let's cheat.
b638219a23c3 cborutil: cast bytearray to bytes
Gregory Szorc <gregory.szorc@gmail.com>
parents: 40031
diff changeset
1016 if isinstance(b, bytearray):
b638219a23c3 cborutil: cast bytearray to bytes
Gregory Szorc <gregory.szorc@gmail.com>
parents: 40031
diff changeset
1017 b = bytes(b)
b638219a23c3 cborutil: cast bytearray to bytes
Gregory Szorc <gregory.szorc@gmail.com>
parents: 40031
diff changeset
1018
40031
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1019 # Our strategy for buffering is to aggregate the incoming chunks in a
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1020 # list until we've received enough data to decode the next item.
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1021 # This is slightly more complicated than using an ``io.BytesIO``
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1022 # or continuously concatenating incoming data. However, because it
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1023 # isn't constantly reallocating backing memory for a growing buffer,
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1024 # it prevents excessive memory thrashing and is significantly faster,
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1025 # especially in cases where the percentage of input chunks that don't
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1026 # decode into a full item is high.
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1027
40031
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1028 if self._chunks:
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1029 # A previous call said we needed N bytes to decode the next item.
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1030 # But this call doesn't provide enough data. We buffer the incoming
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1031 # chunk without attempting to decode.
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1032 if len(b) < self._wanted:
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1033 self._chunks.append(b)
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1034 self._wanted -= len(b)
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1035 return False, 0, self._wanted
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1036
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1037 # Else we may have enough data to decode the next item. Aggregate
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1038 # old data with new and reset the buffer.
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1039 newlen = len(b)
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1040 self._chunks.append(b)
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1041 b = b''.join(self._chunks)
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1042 self._chunks = []
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1043 oldlen = len(b) - newlen
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1044
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1045 else:
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1046 oldlen = 0
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1047
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1048 available, readcount, wanted = self._decoder.decode(b)
40031
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1049 self._wanted = wanted
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1050
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1051 if readcount < len(b):
40031
62160d3077cd cborutil: change buffering strategy
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39473
diff changeset
1052 self._chunks.append(b[readcount:])
39440
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1053
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1054 return available, readcount - oldlen, wanted
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1055
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1056 def getavailable(self):
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1057 return self._decoder.getavailable()
babad5ebaf0a cborutil: add a buffering decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39439
diff changeset
1058
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42176
diff changeset
1059
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1060 def decodeall(b):
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1061 """Decode all CBOR items present in an iterable of bytes.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1062
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1063 In addition to regular decode errors, raises CBORDecodeError if the
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1064 entirety of the passed buffer does not fully decode to complete CBOR
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1065 values. This includes failure to decode any value, incomplete collection
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1066 types, incomplete indefinite length items, and extra data at the end of
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1067 the buffer.
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1068 """
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1069 if not b:
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1070 return []
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1071
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1072 decoder = sansiodecoder()
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1073
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1074 havevalues, readcount, wantbytes = decoder.decode(b)
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1075
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1076 if readcount != len(b):
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
1077 raise CBORDecodeError(b'input data not fully consumed')
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1078
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1079 if decoder.inprogress:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
1080 raise CBORDecodeError(b'input data not complete')
39438
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1081
aeb551a3bb8a cborutil: implement sans I/O decoder
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37942
diff changeset
1082 return decoder.getavailable()