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annotate contrib/python-zstandard/c-ext/frameparams.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:
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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) {
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17 const char* source;
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18 Py_ssize_t sourceSize;
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19 ZSTD_frameParams params;
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20 FrameParametersObject* result = NULL;
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21 size_t zresult;
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22
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23 #if PY_MAJOR_VERSION >= 3
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24 if (!PyArg_ParseTuple(args, "y#:get_frame_parameters",
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25 #else
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26 if (!PyArg_ParseTuple(args, "s#:get_frame_parameters",
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27 #endif
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28 &source, &sourceSize)) {
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29 return NULL;
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30 }
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31
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32 /* Needed for Python 2 to reject unicode */
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33 if (!PyBytes_Check(PyTuple_GET_ITEM(args, 0))) {
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34 PyErr_SetString(PyExc_TypeError, "argument must be bytes");
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35 return NULL;
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36 }
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37
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38 zresult = ZSTD_getFrameParams(&params, (void*)source, sourceSize);
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39
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40 if (ZSTD_isError(zresult)) {
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41 PyErr_Format(ZstdError, "cannot get frame parameters: %s", ZSTD_getErrorName(zresult));
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42 return NULL;
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43 }
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44
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45 if (zresult) {
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46 PyErr_Format(ZstdError, "not enough data for frame parameters; need %zu bytes", zresult);
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47 return NULL;
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48 }
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49
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50 result = PyObject_New(FrameParametersObject, &FrameParametersType);
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51 if (!result) {
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52 return NULL;
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53 }
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54
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55 result->frameContentSize = params.frameContentSize;
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56 result->windowSize = params.windowSize;
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57 result->dictID = params.dictID;
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58 result->checksumFlag = params.checksumFlag ? 1 : 0;
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59
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60 return result;
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61 }
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62
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63 static void FrameParameters_dealloc(PyObject* self) {
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64 PyObject_Del(self);
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65 }
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66
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67 static PyMemberDef FrameParameters_members[] = {
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68 { "content_size", T_ULONGLONG,
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69 offsetof(FrameParametersObject, frameContentSize), READONLY,
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70 "frame content size" },
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71 { "window_size", T_UINT,
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72 offsetof(FrameParametersObject, windowSize), READONLY,
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73 "window size" },
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74 { "dict_id", T_UINT,
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75 offsetof(FrameParametersObject, dictID), READONLY,
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76 "dictionary ID" },
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77 { "has_checksum", T_BOOL,
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78 offsetof(FrameParametersObject, checksumFlag), READONLY,
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79 "checksum flag" },
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80 { NULL }
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81 };
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82
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83 PyTypeObject FrameParametersType = {
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84 PyVarObject_HEAD_INIT(NULL, 0)
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85 "FrameParameters", /* tp_name */
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86 sizeof(FrameParametersObject), /* tp_basicsize */
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87 0, /* tp_itemsize */
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88 (destructor)FrameParameters_dealloc, /* tp_dealloc */
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89 0, /* tp_print */
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90 0, /* tp_getattr */
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91 0, /* tp_setattr */
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92 0, /* tp_compare */
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93 0, /* tp_repr */
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94 0, /* tp_as_number */
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95 0, /* tp_as_sequence */
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96 0, /* tp_as_mapping */
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97 0, /* tp_hash */
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98 0, /* tp_call */
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99 0, /* tp_str */
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100 0, /* tp_getattro */
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101 0, /* tp_setattro */
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102 0, /* tp_as_buffer */
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103 Py_TPFLAGS_DEFAULT, /* tp_flags */
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104 FrameParameters__doc__, /* tp_doc */
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105 0, /* tp_traverse */
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106 0, /* tp_clear */
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107 0, /* tp_richcompare */
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108 0, /* tp_weaklistoffset */
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109 0, /* tp_iter */
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110 0, /* tp_iternext */
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111 0, /* tp_methods */
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112 FrameParameters_members, /* tp_members */
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113 0, /* tp_getset */
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114 0, /* tp_base */
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115 0, /* tp_dict */
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116 0, /* tp_descr_get */
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117 0, /* tp_descr_set */
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118 0, /* tp_dictoffset */
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119 0, /* tp_init */
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120 0, /* tp_alloc */
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121 0, /* tp_new */
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122 };
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123
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124 void frameparams_module_init(PyObject* mod) {
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125 Py_TYPE(&FrameParametersType) = &PyType_Type;
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126 if (PyType_Ready(&FrameParametersType) < 0) {
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127 return;
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128 }
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129
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130 Py_INCREF(&FrameParametersType);
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131 PyModule_AddObject(mod, "FrameParameters", (PyObject*)&FrameParametersType);
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132 }