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annotate contrib/python-zstandard/c-ext/frameparams.c @ 40121:73fef626dae3

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zstandard: vendor python-zstandard 0.10.1 This was just released. The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. setup.py was updated to pass a new argument to python-zstandard's function for returning an Extension instance. Upstream had to change to use relative paths because Python 3.7's packaging doesn't seem to like absolute paths when defining sources, includes, etc. The default relative path calculation is relative to setup_zstd.py which is different from the directory of Mercurial's setup.py. The project contains a vendored copy of zstandard 1.3.6. The old version was 1.3.4. The API should be backwards compatible and nothing in core should need adjusted. However, there is a new "chunker" API that we may find useful in places where we want to emit compressed chunks of a fixed size. There are a pair of bug fixes in 0.10.0 with regards to compressobj() and decompressobj() when block flushing is used. I actually found these bugs when introducing these APIs in Mercurial! But existing Mercurial code is not affected because we don't perform block flushing. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D4911
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 08 Oct 2018 16:27:40 -0700
parents b1fb341d8a61
children e92ca942ddca
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1 /**
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2 * Copyright (c) 2017-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(FrameParameters__doc__,
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14 "FrameParameters: information about a zstd frame");
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15
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16 FrameParametersObject* get_frame_parameters(PyObject* self, PyObject* args, PyObject* kwargs) {
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17 static char* kwlist[] = {
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18 "data",
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19 NULL
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20 };
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21
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22 Py_buffer source;
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23 ZSTD_frameHeader header;
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24 FrameParametersObject* result = NULL;
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25 size_t zresult;
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26
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27 #if PY_MAJOR_VERSION >= 3
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28 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:get_frame_parameters",
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29 #else
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30 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:get_frame_parameters",
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31 #endif
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32 kwlist, &source)) {
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33 return NULL;
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34 }
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35
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36 if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
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37 PyErr_SetString(PyExc_ValueError,
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38 "data buffer should be contiguous and have at most one dimension");
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39 goto finally;
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40 }
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41
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42 zresult = ZSTD_getFrameHeader(&header, source.buf, source.len);
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43
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44 if (ZSTD_isError(zresult)) {
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45 PyErr_Format(ZstdError, "cannot get frame parameters: %s", ZSTD_getErrorName(zresult));
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46 goto finally;
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47 }
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48
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49 if (zresult) {
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50 PyErr_Format(ZstdError, "not enough data for frame parameters; need %zu bytes", zresult);
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51 goto finally;
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52 }
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53
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54 result = PyObject_New(FrameParametersObject, &FrameParametersType);
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55 if (!result) {
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56 goto finally;
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57 }
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58
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59 result->frameContentSize = header.frameContentSize;
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60 result->windowSize = header.windowSize;
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61 result->dictID = header.dictID;
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62 result->checksumFlag = header.checksumFlag ? 1 : 0;
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63
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64 finally:
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65 PyBuffer_Release(&source);
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66 return result;
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67 }
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68
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69 static void FrameParameters_dealloc(PyObject* self) {
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70 PyObject_Del(self);
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71 }
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72
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73 static PyMemberDef FrameParameters_members[] = {
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74 { "content_size", T_ULONGLONG,
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75 offsetof(FrameParametersObject, frameContentSize), READONLY,
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76 "frame content size" },
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77 { "window_size", T_ULONGLONG,
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78 offsetof(FrameParametersObject, windowSize), READONLY,
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79 "window size" },
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80 { "dict_id", T_UINT,
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81 offsetof(FrameParametersObject, dictID), READONLY,
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82 "dictionary ID" },
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83 { "has_checksum", T_BOOL,
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84 offsetof(FrameParametersObject, checksumFlag), READONLY,
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85 "checksum flag" },
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86 { NULL }
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87 };
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88
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89 PyTypeObject FrameParametersType = {
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90 PyVarObject_HEAD_INIT(NULL, 0)
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91 "FrameParameters", /* tp_name */
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92 sizeof(FrameParametersObject), /* tp_basicsize */
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93 0, /* tp_itemsize */
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94 (destructor)FrameParameters_dealloc, /* tp_dealloc */
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95 0, /* tp_print */
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96 0, /* tp_getattr */
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97 0, /* tp_setattr */
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98 0, /* tp_compare */
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99 0, /* tp_repr */
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100 0, /* tp_as_number */
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101 0, /* tp_as_sequence */
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102 0, /* tp_as_mapping */
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103 0, /* tp_hash */
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104 0, /* tp_call */
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105 0, /* tp_str */
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106 0, /* tp_getattro */
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107 0, /* tp_setattro */
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108 0, /* tp_as_buffer */
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109 Py_TPFLAGS_DEFAULT, /* tp_flags */
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110 FrameParameters__doc__, /* tp_doc */
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111 0, /* tp_traverse */
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112 0, /* tp_clear */
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113 0, /* tp_richcompare */
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114 0, /* tp_weaklistoffset */
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115 0, /* tp_iter */
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116 0, /* tp_iternext */
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117 0, /* tp_methods */
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118 FrameParameters_members, /* tp_members */
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119 0, /* tp_getset */
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120 0, /* tp_base */
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121 0, /* tp_dict */
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122 0, /* tp_descr_get */
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123 0, /* tp_descr_set */
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124 0, /* tp_dictoffset */
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125 0, /* tp_init */
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126 0, /* tp_alloc */
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127 0, /* tp_new */
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128 };
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129
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130 void frameparams_module_init(PyObject* mod) {
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131 Py_TYPE(&FrameParametersType) = &PyType_Type;
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132 if (PyType_Ready(&FrameParametersType) < 0) {
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133 return;
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134 }
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135
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136 Py_INCREF(&FrameParametersType);
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137 PyModule_AddObject(mod, "FrameParameters", (PyObject*)&FrameParametersType);
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138 }