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annotate contrib/python-zstandard/zstd.c @ 30822:b54a2984cdd4

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zstd: vendor python-zstandard 0.6.0 Commit 63c68d6f5fc8de4afd9bde81b13b537beb4e47e8 from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). This includes minor performance and feature improvements. It also changes the vendored zstd library from 1.1.1 to 1.1.2. # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 14 Jan 2017 19:41:43 -0800
parents b86a448a2965
children c32454d69b85
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /* A Python C extension for Zstandard. */
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10
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11 #include "python-zstandard.h"
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12
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13 PyObject *ZstdError;
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14
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15 PyDoc_STRVAR(estimate_compression_context_size__doc__,
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16 "estimate_compression_context_size(compression_parameters)\n"
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17 "\n"
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18 "Give the amount of memory allocated for a compression context given a\n"
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19 "CompressionParameters instance");
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20
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21 PyDoc_STRVAR(estimate_decompression_context_size__doc__,
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22 "estimate_decompression_context_size()\n"
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23 "\n"
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24 "Estimate the amount of memory allocated to a decompression context.\n"
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25 );
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26
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27 static PyObject* estimate_decompression_context_size(PyObject* self) {
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28 return PyLong_FromSize_t(ZSTD_estimateDCtxSize());
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29 }
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30
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31 PyDoc_STRVAR(get_compression_parameters__doc__,
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32 "get_compression_parameters(compression_level[, source_size[, dict_size]])\n"
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33 "\n"
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34 "Obtains a ``CompressionParameters`` instance from a compression level and\n"
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35 "optional input size and dictionary size");
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36
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37 PyDoc_STRVAR(train_dictionary__doc__,
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38 "train_dictionary(dict_size, samples)\n"
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39 "\n"
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40 "Train a dictionary from sample data.\n"
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41 "\n"
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42 "A compression dictionary of size ``dict_size`` will be created from the\n"
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43 "iterable of samples provided by ``samples``.\n"
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44 "\n"
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45 "The raw dictionary content will be returned\n");
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46
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47 static char zstd_doc[] = "Interface to zstandard";
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48
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49 static PyMethodDef zstd_methods[] = {
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50 { "estimate_compression_context_size", (PyCFunction)estimate_compression_context_size,
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51 METH_VARARGS, estimate_compression_context_size__doc__ },
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52 { "estimate_decompression_context_size", (PyCFunction)estimate_decompression_context_size,
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53 METH_NOARGS, estimate_decompression_context_size__doc__ },
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54 { "get_compression_parameters", (PyCFunction)get_compression_parameters,
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55 METH_VARARGS, get_compression_parameters__doc__ },
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56 { "train_dictionary", (PyCFunction)train_dictionary,
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57 METH_VARARGS | METH_KEYWORDS, train_dictionary__doc__ },
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58 { NULL, NULL }
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59 };
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60
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61 void compressobj_module_init(PyObject* mod);
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62 void compressor_module_init(PyObject* mod);
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63 void compressionparams_module_init(PyObject* mod);
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64 void constants_module_init(PyObject* mod);
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65 void dictparams_module_init(PyObject* mod);
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66 void compressiondict_module_init(PyObject* mod);
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67 void compressionwriter_module_init(PyObject* mod);
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68 void compressoriterator_module_init(PyObject* mod);
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69 void decompressor_module_init(PyObject* mod);
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70 void decompressobj_module_init(PyObject* mod);
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71 void decompressionwriter_module_init(PyObject* mod);
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72 void decompressoriterator_module_init(PyObject* mod);
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73
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74 void zstd_module_init(PyObject* m) {
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75 /* python-zstandard relies on unstable zstd C API features. This means
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76 that changes in zstd may break expectations in python-zstandard.
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77
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78 python-zstandard is distributed with a copy of the zstd sources.
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79 python-zstandard is only guaranteed to work with the bundled version
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80 of zstd.
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81
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82 However, downstream redistributors or packagers may unbundle zstd
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83 from python-zstandard. This can result in a mismatch between zstd
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84 versions and API semantics. This essentially "voids the warranty"
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85 of python-zstandard and may cause undefined behavior.
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86
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87 We detect this mismatch here and refuse to load the module if this
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88 scenario is detected.
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89 */
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90 if (ZSTD_VERSION_NUMBER != 10102 || ZSTD_versionNumber() != 10102) {
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91 PyErr_SetString(PyExc_ImportError, "zstd C API mismatch; Python bindings not compiled against expected zstd version");
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92 return;
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93 }
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94
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95 compressionparams_module_init(m);
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96 dictparams_module_init(m);
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97 compressiondict_module_init(m);
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98 compressobj_module_init(m);
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99 compressor_module_init(m);
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100 compressionwriter_module_init(m);
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101 compressoriterator_module_init(m);
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102 constants_module_init(m);
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103 decompressor_module_init(m);
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104 decompressobj_module_init(m);
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105 decompressionwriter_module_init(m);
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106 decompressoriterator_module_init(m);
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107 }
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108
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109 #if PY_MAJOR_VERSION >= 3
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110 static struct PyModuleDef zstd_module = {
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111 PyModuleDef_HEAD_INIT,
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112 "zstd",
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113 zstd_doc,
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114 -1,
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115 zstd_methods
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116 };
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117
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118 PyMODINIT_FUNC PyInit_zstd(void) {
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119 PyObject *m = PyModule_Create(&zstd_module);
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120 if (m) {
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121 zstd_module_init(m);
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122 if (PyErr_Occurred()) {
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123 Py_DECREF(m);
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124 m = NULL;
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125 }
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126 }
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127 return m;
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128 }
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129 #else
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130 PyMODINIT_FUNC initzstd(void) {
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131 PyObject *m = Py_InitModule3("zstd", zstd_methods, zstd_doc);
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132 if (m) {
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133 zstd_module_init(m);
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134 }
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135 }
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136 #endif