Mercurial > hg
annotate contrib/python-zstandard/c-ext/compressobj.c @ 31266:8089de5fab89
dispatch: add pagination of two more help cases
I missed these in the last round anf Yuya spotted them in
review. Thanks!
author | Augie Fackler <augie@google.com> |
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date | Wed, 08 Mar 2017 18:32:42 -0500 |
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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(ZstdCompressionObj__doc__, |
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14 "Perform compression using a standard library compatible API.\n" |
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15 ); |
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16 |
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17 static void ZstdCompressionObj_dealloc(ZstdCompressionObj* self) { |
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18 PyMem_Free(self->output.dst); |
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19 self->output.dst = NULL; |
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20 |
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21 if (self->cstream) { |
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22 ZSTD_freeCStream(self->cstream); |
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23 self->cstream = NULL; |
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24 } |
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25 |
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26 Py_XDECREF(self->compressor); |
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27 |
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28 PyObject_Del(self); |
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29 } |
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30 |
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31 static PyObject* ZstdCompressionObj_compress(ZstdCompressionObj* self, PyObject* args) { |
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32 const char* source; |
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33 Py_ssize_t sourceSize; |
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34 ZSTD_inBuffer input; |
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35 size_t zresult; |
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36 PyObject* result = NULL; |
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37 Py_ssize_t resultSize = 0; |
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38 |
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39 if (self->finished) { |
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40 PyErr_SetString(ZstdError, "cannot call compress() after compressor finished"); |
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41 return NULL; |
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42 } |
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43 |
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44 #if PY_MAJOR_VERSION >= 3 |
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45 if (!PyArg_ParseTuple(args, "y#:compress", &source, &sourceSize)) { |
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46 #else |
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47 if (!PyArg_ParseTuple(args, "s#:compress", &source, &sourceSize)) { |
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48 #endif |
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49 return NULL; |
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50 } |
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51 |
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52 input.src = source; |
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53 input.size = sourceSize; |
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54 input.pos = 0; |
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55 |
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56 while ((ssize_t)input.pos < sourceSize) { |
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57 Py_BEGIN_ALLOW_THREADS |
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58 zresult = ZSTD_compressStream(self->cstream, &self->output, &input); |
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59 Py_END_ALLOW_THREADS |
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60 |
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61 if (ZSTD_isError(zresult)) { |
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62 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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63 return NULL; |
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64 } |
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65 |
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66 if (self->output.pos) { |
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67 if (result) { |
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68 resultSize = PyBytes_GET_SIZE(result); |
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69 if (-1 == _PyBytes_Resize(&result, resultSize + self->output.pos)) { |
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70 return NULL; |
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71 } |
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72 |
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73 memcpy(PyBytes_AS_STRING(result) + resultSize, |
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74 self->output.dst, self->output.pos); |
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75 } |
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76 else { |
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77 result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); |
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78 if (!result) { |
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79 return NULL; |
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80 } |
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81 } |
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82 |
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83 self->output.pos = 0; |
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84 } |
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85 } |
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86 |
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87 if (result) { |
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88 return result; |
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89 } |
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90 else { |
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91 return PyBytes_FromString(""); |
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92 } |
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93 } |
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94 |
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95 static PyObject* ZstdCompressionObj_flush(ZstdCompressionObj* self, PyObject* args) { |
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96 int flushMode = compressorobj_flush_finish; |
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97 size_t zresult; |
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98 PyObject* result = NULL; |
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99 Py_ssize_t resultSize = 0; |
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100 |
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101 if (!PyArg_ParseTuple(args, "|i:flush", &flushMode)) { |
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102 return NULL; |
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103 } |
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104 |
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105 if (flushMode != compressorobj_flush_finish && flushMode != compressorobj_flush_block) { |
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106 PyErr_SetString(PyExc_ValueError, "flush mode not recognized"); |
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107 return NULL; |
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108 } |
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109 |
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110 if (self->finished) { |
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111 PyErr_SetString(ZstdError, "compressor object already finished"); |
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112 return NULL; |
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113 } |
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114 |
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115 assert(self->output.pos == 0); |
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116 |
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117 if (flushMode == compressorobj_flush_block) { |
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118 /* The output buffer is of size ZSTD_CStreamOutSize(), which is |
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119 guaranteed to hold a full block. */ |
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120 Py_BEGIN_ALLOW_THREADS |
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121 zresult = ZSTD_flushStream(self->cstream, &self->output); |
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122 Py_END_ALLOW_THREADS |
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123 |
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124 if (ZSTD_isError(zresult)) { |
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125 PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); |
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126 return NULL; |
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127 } |
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128 |
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129 /* Output buffer is guaranteed to hold full block. */ |
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130 assert(zresult == 0); |
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131 |
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132 if (self->output.pos) { |
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133 result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); |
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134 if (!result) { |
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135 return NULL; |
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136 } |
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137 } |
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138 |
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139 self->output.pos = 0; |
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140 |
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141 if (result) { |
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142 return result; |
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143 } |
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144 else { |
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145 return PyBytes_FromString(""); |
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146 } |
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147 } |
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148 |
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149 assert(flushMode == compressorobj_flush_finish); |
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150 self->finished = 1; |
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151 |
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152 while (1) { |
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153 zresult = ZSTD_endStream(self->cstream, &self->output); |
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154 if (ZSTD_isError(zresult)) { |
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155 PyErr_Format(ZstdError, "error ending compression stream: %s", |
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156 ZSTD_getErrorName(zresult)); |
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157 return NULL; |
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158 } |
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159 |
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160 if (self->output.pos) { |
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161 if (result) { |
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162 resultSize = PyBytes_GET_SIZE(result); |
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163 if (-1 == _PyBytes_Resize(&result, resultSize + self->output.pos)) { |
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164 return NULL; |
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165 } |
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166 |
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167 memcpy(PyBytes_AS_STRING(result) + resultSize, |
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168 self->output.dst, self->output.pos); |
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169 } |
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170 else { |
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171 result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); |
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172 if (!result) { |
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173 return NULL; |
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|
174 } |
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|
175 } |
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176 |
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177 self->output.pos = 0; |
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178 } |
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179 |
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180 if (!zresult) { |
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181 break; |
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182 } |
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183 } |
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184 |
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185 ZSTD_freeCStream(self->cstream); |
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186 self->cstream = NULL; |
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187 |
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188 if (result) { |
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189 return result; |
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|
190 } |
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191 else { |
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192 return PyBytes_FromString(""); |
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|
193 } |
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|
194 } |
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195 |
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|
196 static PyMethodDef ZstdCompressionObj_methods[] = { |
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|
197 { "compress", (PyCFunction)ZstdCompressionObj_compress, METH_VARARGS, |
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|
198 PyDoc_STR("compress data") }, |
30822
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|
199 { "flush", (PyCFunction)ZstdCompressionObj_flush, METH_VARARGS, |
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|
200 PyDoc_STR("finish compression operation") }, |
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|
201 { NULL, NULL } |
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|
202 }; |
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|
203 |
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|
204 PyTypeObject ZstdCompressionObjType = { |
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|
205 PyVarObject_HEAD_INIT(NULL, 0) |
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|
206 "zstd.ZstdCompressionObj", /* tp_name */ |
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|
207 sizeof(ZstdCompressionObj), /* tp_basicsize */ |
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|
208 0, /* tp_itemsize */ |
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|
209 (destructor)ZstdCompressionObj_dealloc, /* tp_dealloc */ |
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|
210 0, /* tp_print */ |
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|
211 0, /* tp_getattr */ |
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|
212 0, /* tp_setattr */ |
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|
213 0, /* tp_compare */ |
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|
214 0, /* tp_repr */ |
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|
215 0, /* tp_as_number */ |
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|
216 0, /* tp_as_sequence */ |
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|
217 0, /* tp_as_mapping */ |
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|
218 0, /* tp_hash */ |
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|
219 0, /* tp_call */ |
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parents:
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|
220 0, /* tp_str */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
221 0, /* tp_getattro */ |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
222 0, /* tp_setattro */ |
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parents:
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|
223 0, /* tp_as_buffer */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
224 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
225 ZstdCompressionObj__doc__, /* tp_doc */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
226 0, /* tp_traverse */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
227 0, /* tp_clear */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
228 0, /* tp_richcompare */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
229 0, /* tp_weaklistoffset */ |
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parents:
diff
changeset
|
230 0, /* tp_iter */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
231 0, /* tp_iternext */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
232 ZstdCompressionObj_methods, /* tp_methods */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
233 0, /* tp_members */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
234 0, /* tp_getset */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
235 0, /* tp_base */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
236 0, /* tp_dict */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
237 0, /* tp_descr_get */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
238 0, /* tp_descr_set */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
239 0, /* tp_dictoffset */ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
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240 0, /* tp_init */ |
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241 0, /* tp_alloc */ |
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242 PyType_GenericNew, /* tp_new */ |
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243 }; |
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244 |
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245 void compressobj_module_init(PyObject* module) { |
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246 Py_TYPE(&ZstdCompressionObjType) = &PyType_Type; |
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247 if (PyType_Ready(&ZstdCompressionObjType) < 0) { |
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248 return; |
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249 } |
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250 } |