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annotate contrib/python-zstandard/c-ext/decompressobj.c @ 31796:e0dc40530c5a

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zstd: vendor python-zstandard 0.8.0 Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). Updates relevant to Mercurial include: * Support for multi-threaded compression (we can use this for bundle and wire protocol compression). * APIs for batch compression and decompression operations using multiple threads and optimal memory allocation mechanism. (Can be useful for revlog perf improvements.) * A ``BufferWithSegments`` type that models a single memory buffer containing N discrete items of known lengths. This type can be used for very efficient 0-copy data operations. # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 01 Apr 2017 15:24:03 -0700
parents c32454d69b85
children b1fb341d8a61
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /**
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2 * Copyright (c) 2016-present, Gregory Szorc
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3 * All rights reserved.
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4 *
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5 * This software may be modified and distributed under the terms
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6 * of the BSD license. See the LICENSE file for details.
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7 */
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8
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9 #include "python-zstandard.h"
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10
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11 extern PyObject* ZstdError;
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12
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13 PyDoc_STRVAR(DecompressionObj__doc__,
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14 "Perform decompression using a standard library compatible API.\n"
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15 );
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16
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17 static void DecompressionObj_dealloc(ZstdDecompressionObj* self) {
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18 Py_XDECREF(self->decompressor);
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19
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20 PyObject_Del(self);
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21 }
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22
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23 static PyObject* DecompressionObj_decompress(ZstdDecompressionObj* self, PyObject* args) {
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24 const char* source;
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25 Py_ssize_t sourceSize;
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26 size_t zresult;
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27 ZSTD_inBuffer input;
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28 ZSTD_outBuffer output;
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29 size_t outSize = ZSTD_DStreamOutSize();
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30 PyObject* result = NULL;
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31 Py_ssize_t resultSize = 0;
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32
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33 /* Constructor should ensure stream is populated. */
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34 assert(self->decompressor->dstream);
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35
30435
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36 if (self->finished) {
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37 PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
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38 return NULL;
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39 }
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40
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41 #if PY_MAJOR_VERSION >= 3
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42 if (!PyArg_ParseTuple(args, "y#:decompress",
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43 #else
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44 if (!PyArg_ParseTuple(args, "s#:decompress",
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45 #endif
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46 &source, &sourceSize)) {
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47 return NULL;
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48 }
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49
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50 input.src = source;
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51 input.size = sourceSize;
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52 input.pos = 0;
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53
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54 output.dst = PyMem_Malloc(outSize);
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55 if (!output.dst) {
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56 PyErr_NoMemory();
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57 return NULL;
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58 }
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59 output.size = outSize;
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60 output.pos = 0;
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61
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62 /* Read input until exhausted. */
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63 while (input.pos < input.size) {
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64 Py_BEGIN_ALLOW_THREADS
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65 zresult = ZSTD_decompressStream(self->decompressor->dstream, &output, &input);
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66 Py_END_ALLOW_THREADS
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67
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68 if (ZSTD_isError(zresult)) {
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69 PyErr_Format(ZstdError, "zstd decompressor error: %s",
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70 ZSTD_getErrorName(zresult));
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71 result = NULL;
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72 goto finally;
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73 }
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74
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75 if (0 == zresult) {
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76 self->finished = 1;
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77 }
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78
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79 if (output.pos) {
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80 if (result) {
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81 resultSize = PyBytes_GET_SIZE(result);
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82 if (-1 == _PyBytes_Resize(&result, resultSize + output.pos)) {
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83 goto except;
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84 }
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85
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86 memcpy(PyBytes_AS_STRING(result) + resultSize,
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87 output.dst, output.pos);
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88 }
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89 else {
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90 result = PyBytes_FromStringAndSize(output.dst, output.pos);
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91 if (!result) {
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92 goto except;
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93 }
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94 }
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95
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96 output.pos = 0;
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97 }
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98 }
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99
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100 if (!result) {
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101 result = PyBytes_FromString("");
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102 }
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103
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104 goto finally;
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105
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106 except:
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107 Py_CLEAR(result);
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108
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109 finally:
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110 PyMem_Free(output.dst);
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111
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112 return result;
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113 }
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114
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115 static PyMethodDef DecompressionObj_methods[] = {
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116 { "decompress", (PyCFunction)DecompressionObj_decompress,
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117 METH_VARARGS, PyDoc_STR("decompress data") },
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118 { NULL, NULL }
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119 };
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120
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121 PyTypeObject ZstdDecompressionObjType = {
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122 PyVarObject_HEAD_INIT(NULL, 0)
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123 "zstd.ZstdDecompressionObj", /* tp_name */
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124 sizeof(ZstdDecompressionObj), /* tp_basicsize */
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125 0, /* tp_itemsize */
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126 (destructor)DecompressionObj_dealloc, /* tp_dealloc */
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127 0, /* tp_print */
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128 0, /* tp_getattr */
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129 0, /* tp_setattr */
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130 0, /* tp_compare */
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131 0, /* tp_repr */
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132 0, /* tp_as_number */
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133 0, /* tp_as_sequence */
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134 0, /* tp_as_mapping */
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135 0, /* tp_hash */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
136 0, /* tp_call */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
137 0, /* tp_str */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
138 0, /* tp_getattro */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139 0, /* tp_setattro */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 0, /* tp_as_buffer */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
141 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
142 DecompressionObj__doc__, /* tp_doc */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
143 0, /* tp_traverse */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
144 0, /* tp_clear */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
145 0, /* tp_richcompare */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
146 0, /* tp_weaklistoffset */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147 0, /* tp_iter */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148 0, /* tp_iternext */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149 DecompressionObj_methods, /* tp_methods */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 0, /* tp_members */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
151 0, /* tp_getset */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
152 0, /* tp_base */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
153 0, /* tp_dict */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
154 0, /* tp_descr_get */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
155 0, /* tp_descr_set */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
156 0, /* tp_dictoffset */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
157 0, /* tp_init */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
158 0, /* tp_alloc */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
159 PyType_GenericNew, /* tp_new */
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
160 };
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
161
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162 void decompressobj_module_init(PyObject* module) {
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
163 Py_TYPE(&ZstdDecompressionObjType) = &PyType_Type;
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
164 if (PyType_Ready(&ZstdDecompressionObjType) < 0) {
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
165 return;
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
166 }
b86a448a2965 zstd: vendor python-zstandard 0.5.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 }