Mercurial > cpython-lru_cache-weakref

annotate Objects/bufferobject.c @ 38664:7619216bbc19 2.4

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Bug #1502728: Correctly link against librt library on HP-UX. (backport from rev. 46743)
author Georg Brandl <georg@python.org>
date Thu, 08 Jun 2006 12:54:16 +0000
parents 97c97194e64b
children 3f358afbb3d3 0bc6cfb6b5fb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Buffer object implementation */
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3
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4 #include "Python.h"
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5
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6
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7 typedef struct {
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8 PyObject_HEAD
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9 PyObject *b_base;
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10 void *b_ptr;
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11 int b_size;
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12 int b_offset;
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13 int b_readonly;
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14 long b_hash;
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15 } PyBufferObject;
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16
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17
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18 static int
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19 get_buf(PyBufferObject *self, void **ptr, int *size)
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20 {
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21 if (self->b_base == NULL) {
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22 assert (ptr != NULL);
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23 *ptr = self->b_ptr;
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24 *size = self->b_size;
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25 }
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26 else {
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27 int count, offset;
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28 getreadbufferproc proc;
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29 PyBufferProcs *bp = self->b_base->ob_type->tp_as_buffer;
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30 if ((*bp->bf_getsegcount)(self->b_base, NULL) != 1) {
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31 PyErr_SetString(PyExc_TypeError,
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32 "single-segment buffer object expected");
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33 return 0;
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34 }
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35 if (self->b_readonly)
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36 proc = bp->bf_getreadbuffer;
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37 else
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38 proc = (getreadbufferproc)bp->bf_getwritebuffer;
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39 if ((count = (*proc)(self->b_base, 0, ptr)) < 0)
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40 return 0;
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41 /* apply constraints to the start/end */
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42 if (self->b_offset > count)
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43 offset = count;
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44 else
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45 offset = self->b_offset;
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46 *(char **)ptr = *(char **)ptr + offset;
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47 if (self->b_size == Py_END_OF_BUFFER)
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48 *size = count;
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49 else
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50 *size = self->b_size;
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51 if (offset + *size > count)
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52 *size = count - offset;
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53 }
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54 return 1;
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55 }
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56
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57
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58 static PyObject *
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59 buffer_from_memory(PyObject *base, int size, int offset, void *ptr,
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60 int readonly)
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61 {
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62 PyBufferObject * b;
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63
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64 if (size < 0 && size != Py_END_OF_BUFFER) {
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65 PyErr_SetString(PyExc_ValueError,
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66 "size must be zero or positive");
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67 return NULL;
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68 }
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69 if (offset < 0) {
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70 PyErr_SetString(PyExc_ValueError,
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71 "offset must be zero or positive");
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72 return NULL;
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73 }
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74
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75 b = PyObject_NEW(PyBufferObject, &PyBuffer_Type);
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76 if ( b == NULL )
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77 return NULL;
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78
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79 Py_XINCREF(base);
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80 b->b_base = base;
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81 b->b_ptr = ptr;
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82 b->b_size = size;
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83 b->b_offset = offset;
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84 b->b_readonly = readonly;
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85 b->b_hash = -1;
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86
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87 return (PyObject *) b;
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88 }
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89
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90 static PyObject *
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91 buffer_from_object(PyObject *base, int size, int offset, int readonly)
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92 {
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93 if (offset < 0) {
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94 PyErr_SetString(PyExc_ValueError,
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95 "offset must be zero or positive");
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96 return NULL;
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97 }
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98 if ( PyBuffer_Check(base) && (((PyBufferObject *)base)->b_base) ) {
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99 /* another buffer, refer to the base object */
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100 PyBufferObject *b = (PyBufferObject *)base;
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101 if (b->b_size != Py_END_OF_BUFFER) {
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102 int base_size = b->b_size - offset;
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103 if (base_size < 0)
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104 base_size = 0;
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105 if (size == Py_END_OF_BUFFER || size > base_size)
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106 size = base_size;
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107 }
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108 offset += b->b_offset;
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109 base = b->b_base;
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110 }
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111 return buffer_from_memory(base, size, offset, NULL, readonly);
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112 }
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113
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114
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115 PyObject *
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116 PyBuffer_FromObject(PyObject *base, int offset, int size)
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117 {
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118 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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119
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120 if ( pb == NULL ||
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121 pb->bf_getreadbuffer == NULL ||
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122 pb->bf_getsegcount == NULL )
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123 {
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124 PyErr_SetString(PyExc_TypeError, "buffer object expected");
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125 return NULL;
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126 }
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127
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128 return buffer_from_object(base, size, offset, 1);
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129 }
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130
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131 PyObject *
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132 PyBuffer_FromReadWriteObject(PyObject *base, int offset, int size)
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133 {
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134 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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135
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136 if ( pb == NULL ||
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137 pb->bf_getwritebuffer == NULL ||
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138 pb->bf_getsegcount == NULL )
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139 {
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140 PyErr_SetString(PyExc_TypeError, "buffer object expected");
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141 return NULL;
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142 }
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143
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144 return buffer_from_object(base, size, offset, 0);
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145 }
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146
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147 PyObject *
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148 PyBuffer_FromMemory(void *ptr, int size)
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149 {
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150 return buffer_from_memory(NULL, size, 0, ptr, 1);
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151 }
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152
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153 PyObject *
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154 PyBuffer_FromReadWriteMemory(void *ptr, int size)
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155 {
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156 return buffer_from_memory(NULL, size, 0, ptr, 0);
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157 }
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158
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159 PyObject *
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160 PyBuffer_New(int size)
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161 {
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162 PyObject *o;
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163 PyBufferObject * b;
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164
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165 if (size < 0) {
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166 PyErr_SetString(PyExc_ValueError,
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167 "size must be zero or positive");
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168 return NULL;
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169 }
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170 /* Inline PyObject_New */
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171 o = PyObject_MALLOC(sizeof(*b) + size);
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172 if ( o == NULL )
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173 return PyErr_NoMemory();
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174 b = (PyBufferObject *) PyObject_INIT(o, &PyBuffer_Type);
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175
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176 b->b_base = NULL;
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177 b->b_ptr = (void *)(b + 1);
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178 b->b_size = size;
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179 b->b_offset = 0;
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180 b->b_readonly = 0;
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181 b->b_hash = -1;
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182
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183 return o;
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184 }
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185
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186 /* Methods */
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187
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188 static PyObject *
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189 buffer_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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190 {
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191 PyObject *ob;
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192 int offset = 0;
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193 int size = Py_END_OF_BUFFER;
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194
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195 if (!_PyArg_NoKeywords("buffer()", kw))
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196 return NULL;
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197
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198 if (!PyArg_ParseTuple(args, "O|ii:buffer", &ob, &offset, &size))
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199 return NULL;
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200 return PyBuffer_FromObject(ob, offset, size);
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201 }
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202
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203 PyDoc_STRVAR(buffer_doc,
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204 "buffer(object [, offset[, size]])\n\
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205 \n\
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206 Create a new buffer object which references the given object.\n\
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207 The buffer will reference a slice of the target object from the\n\
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208 start of the object (or at the specified offset). The slice will\n\
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diff changeset
209 extend to the end of the target object (or with the specified size).");
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210
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211
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212 static void
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213 buffer_dealloc(PyBufferObject *self)
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214 {
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215 Py_XDECREF(self->b_base);
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216 PyObject_DEL(self);
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217 }
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218
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219 static int
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220 buffer_compare(PyBufferObject *self, PyBufferObject *other)
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221 {
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diff changeset
222 void *p1, *p2;
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diff changeset
223 int len_self, len_other, min_len, cmp;
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224
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diff changeset
225 if (!get_buf(self, &p1, &len_self))
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diff changeset
226 return -1;
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diff changeset
227 if (!get_buf(other, &p2, &len_other))
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228 return -1;
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229 min_len = (len_self < len_other) ? len_self : len_other;
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230 if (min_len > 0) {
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231 cmp = memcmp(p1, p2, min_len);
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232 if (cmp != 0)
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233 return cmp;
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diff changeset
234 }
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diff changeset
235 return (len_self < len_other) ? -1 : (len_self > len_other) ? 1 : 0;
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236 }
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237
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238 static PyObject *
13449
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diff changeset
239 buffer_repr(PyBufferObject *self)
9278
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240 {
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diff changeset
241 char *status = self->b_readonly ? "read-only" : "read-write";
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242
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243 if ( self->b_base == NULL )
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244 return PyString_FromFormat("<%s buffer ptr %p, size %d at %p>",
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diff changeset
245 status,
0e70df98424e repr's converted to using PyString_FromFormat() instead of sprintf'ing
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parents: 18933
diff changeset
246 self->b_ptr,
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diff changeset
247 self->b_size,
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diff changeset
248 self);
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249 else
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diff changeset
250 return PyString_FromFormat(
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251 "<%s buffer for %p, size %d, offset %d at %p>",
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252 status,
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
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253 self->b_base,
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254 self->b_size,
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diff changeset
255 self->b_offset,
13210
ff243b0f16ee Trent Mick <trentm@activestate.com>:
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parents: 12576
diff changeset
256 self);
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257 }
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258
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259 static long
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diff changeset
260 buffer_hash(PyBufferObject *self)
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261 {
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diff changeset
262 void *ptr;
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diff changeset
263 int size;
9278
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264 register int len;
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diff changeset
265 register unsigned char *p;
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Guido van Rossum <guido@python.org>
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diff changeset
266 register long x;
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diff changeset
267
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diff changeset
268 if ( self->b_hash != -1 )
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diff changeset
269 return self->b_hash;
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diff changeset
270
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diff changeset
271 /* XXX potential bugs here, a readonly buffer does not imply that the
047148089c35 Document one of the many problems with the buffer object.
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diff changeset
272 * underlying memory is immutable. b_readonly is a necessary but not
047148089c35 Document one of the many problems with the buffer object.
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diff changeset
273 * sufficient condition for a buffer to be hashable. Perhaps it would
047148089c35 Document one of the many problems with the buffer object.
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274 * be better to only allow hashing if the underlying object is known to
047148089c35 Document one of the many problems with the buffer object.
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diff changeset
275 * be immutable (e.g. PyString_Check() is true). Another idea would
047148089c35 Document one of the many problems with the buffer object.
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diff changeset
276 * be to call tp_hash on the underlying object and see if it raises
047148089c35 Document one of the many problems with the buffer object.
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diff changeset
277 * an error. */
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diff changeset
278 if ( !self->b_readonly )
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279 {
31639
047148089c35 Document one of the many problems with the buffer object.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
280 PyErr_SetString(PyExc_TypeError,
047148089c35 Document one of the many problems with the buffer object.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31638
diff changeset
281 "writable buffers are not hashable");
9278
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diff changeset
282 return -1;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
283 }
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parents:
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284
31640
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parents: 31639
diff changeset
285 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
286 return -1;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
287 p = (unsigned char *) ptr;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
288 len = size;
9278
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289 x = *p << 7;
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diff changeset
290 while (--len >= 0)
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parents:
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291 x = (1000003*x) ^ *p++;
31640
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
292 x ^= size;
9278
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293 if (x == -1)
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294 x = -2;
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295 self->b_hash = x;
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296 return x;
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parents:
diff changeset
297 }
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parents:
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298
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299 static PyObject *
13449
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Fred Drake <fdrake@acm.org>
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300 buffer_str(PyBufferObject *self)
9278
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301 {
31640
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
302 void *ptr;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
303 int size;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
304 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
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305 return NULL;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
306 return PyString_FromStringAndSize(ptr, size);
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307 }
c39218a68df1 Add Greg Stein's buffer object API.
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parents:
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308
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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309 /* Sequence methods */
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310
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parents:
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311 static int
13449
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Fred Drake <fdrake@acm.org>
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312 buffer_length(PyBufferObject *self)
9278
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313 {
31640
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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314 void *ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
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315 int size;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
316 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
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317 return -1;
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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318 return size;
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319 }
c39218a68df1 Add Greg Stein's buffer object API.
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320
c39218a68df1 Add Greg Stein's buffer object API.
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321 static PyObject *
13449
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Fred Drake <fdrake@acm.org>
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322 buffer_concat(PyBufferObject *self, PyObject *other)
9278
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323 {
c39218a68df1 Add Greg Stein's buffer object API.
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parents:
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324 PyBufferProcs *pb = other->ob_type->tp_as_buffer;
31640
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
325 void *ptr1, *ptr2;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
326 char *p;
9278
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327 PyObject *ob;
31640
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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diff changeset
328 int size, count;
9278
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329
c39218a68df1 Add Greg Stein's buffer object API.
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330 if ( pb == NULL ||
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Guido van Rossum <guido@python.org>
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331 pb->bf_getreadbuffer == NULL ||
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Guido van Rossum <guido@python.org>
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332 pb->bf_getsegcount == NULL )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
333 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
334 PyErr_BadArgument();
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Guido van Rossum <guido@python.org>
parents:
diff changeset
335 return NULL;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
336 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
337 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
338 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
339 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
340 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
341 "single-segment buffer object expected");
9278
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Guido van Rossum <guido@python.org>
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342 return NULL;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
343 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
344
31640
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
345 if (!get_buf(self, &ptr1, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
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346 return NULL;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
347
9278
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Guido van Rossum <guido@python.org>
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diff changeset
348 /* optimize special case */
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
349 if ( size == 0 )
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
350 {
c39218a68df1 Add Greg Stein's buffer object API.
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parents:
diff changeset
351 Py_INCREF(other);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
352 return other;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
353 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
354
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
355 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &ptr2)) < 0 )
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
356 return NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
357
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
358 ob = PyString_FromStringAndSize(NULL, size + count);
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
359 p = PyString_AS_STRING(ob);
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
360 memcpy(p, ptr1, size);
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
361 memcpy(p + size, ptr2, count);
9278
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Guido van Rossum <guido@python.org>
parents:
diff changeset
362
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
363 /* there is an extra byte in the string object, so this is safe */
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
364 p[size + count] = '\0';
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
365
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
366 return ob;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
367 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
368
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
369 static PyObject *
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
370 buffer_repeat(PyBufferObject *self, int count)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
371 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
372 PyObject *ob;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
373 register char *p;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
374 void *ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
375 int size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
376
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
377 if ( count < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
378 count = 0;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
379 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
380 return NULL;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
381 ob = PyString_FromStringAndSize(NULL, size * count);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
382 if ( ob == NULL )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
383 return NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
384
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
385 p = PyString_AS_STRING(ob);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
386 while ( count-- )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
387 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
388 memcpy(p, ptr, size);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
389 p += size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
390 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
391
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
392 /* there is an extra byte in the string object, so this is safe */
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
393 *p = '\0';
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
394
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
395 return ob;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
396 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
397
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
398 static PyObject *
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
399 buffer_item(PyBufferObject *self, int idx)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
400 {
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
401 void *ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
402 int size;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
403 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
404 return NULL;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
405 if ( idx < 0 || idx >= size ) {
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
406 PyErr_SetString(PyExc_IndexError, "buffer index out of range");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
407 return NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
408 }
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
409 return PyString_FromStringAndSize((char *)ptr + idx, 1);
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
410 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
411
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
412 static PyObject *
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
413 buffer_slice(PyBufferObject *self, int left, int right)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
414 {
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
415 void *ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
416 int size;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
417 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
418 return NULL;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
419 if ( left < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
420 left = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
421 if ( right < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
422 right = 0;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
423 if ( right > size )
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
424 right = size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
425 if ( right < left )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
426 right = left;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
427 return PyString_FromStringAndSize((char *)ptr + left,
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
428 right - left);
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
429 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
430
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
431 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
432 buffer_ass_item(PyBufferObject *self, int idx, PyObject *other)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
433 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
434 PyBufferProcs *pb;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
435 void *ptr1, *ptr2;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
436 int size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
437 int count;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
438
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
439 if ( self->b_readonly ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
440 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
441 "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
442 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
443 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
444
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
445 if (!get_buf(self, &ptr1, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
446 return -1;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
447
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
448 if (idx < 0 || idx >= size) {
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
449 PyErr_SetString(PyExc_IndexError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
450 "buffer assignment index out of range");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
451 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
452 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
453
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
454 pb = other ? other->ob_type->tp_as_buffer : NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
455 if ( pb == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
456 pb->bf_getreadbuffer == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
457 pb->bf_getsegcount == NULL )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
458 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
459 PyErr_BadArgument();
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
460 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
461 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
462 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
463 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
464 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
465 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
466 "single-segment buffer object expected");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
467 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
468 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
469
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
470 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &ptr2)) < 0 )
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
471 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
472 if ( count != 1 ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
473 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
474 "right operand must be a single byte");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
475 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
476 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
477
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
478 ((char *)ptr1)[idx] = *(char *)ptr2;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
479 return 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
480 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
481
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
482 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
483 buffer_ass_slice(PyBufferObject *self, int left, int right, PyObject *other)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
484 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
485 PyBufferProcs *pb;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
486 void *ptr1, *ptr2;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
487 int size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
488 int slice_len;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
489 int count;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
490
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
491 if ( self->b_readonly ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
492 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
493 "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
494 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
495 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
496
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
497 pb = other ? other->ob_type->tp_as_buffer : NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
498 if ( pb == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
499 pb->bf_getreadbuffer == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
500 pb->bf_getsegcount == NULL )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
501 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
502 PyErr_BadArgument();
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
503 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
504 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
505 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
506 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
507 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
508 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
509 "single-segment buffer object expected");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
510 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
511 }
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
512 if (!get_buf(self, &ptr1, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
513 return -1;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
514 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &ptr2)) < 0 )
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
515 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
516
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
517 if ( left < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
518 left = 0;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
519 else if ( left > size )
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
520 left = size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
521 if ( right < left )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
522 right = left;
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
523 else if ( right > size )
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
524 right = size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
525 slice_len = right - left;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
526
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
527 if ( count != slice_len ) {
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
528 PyErr_SetString(
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
529 PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
530 "right operand length must match slice length");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
531 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
532 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
533
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
534 if ( slice_len )
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
535 memcpy((char *)ptr1 + left, ptr2, slice_len);
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
536
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
537 return 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
538 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
539
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
540 /* Buffer methods */
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
541
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
542 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
543 buffer_getreadbuf(PyBufferObject *self, int idx, void **pp)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
544 {
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
545 int size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
546 if ( idx != 0 ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
547 PyErr_SetString(PyExc_SystemError,
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
548 "accessing non-existent buffer segment");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
549 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
550 }
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
551 if (!get_buf(self, pp, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
552 return -1;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
553 return size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
554 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
555
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
556 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
557 buffer_getwritebuf(PyBufferObject *self, int idx, void **pp)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
558 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
559 if ( self->b_readonly )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
560 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
561 PyErr_SetString(PyExc_TypeError, "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
562 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
563 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
564 return buffer_getreadbuf(self, idx, pp);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
565 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
566
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
567 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
568 buffer_getsegcount(PyBufferObject *self, int *lenp)
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
569 {
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
570 void *ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
571 int size;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
572 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
573 return -1;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
574 if (lenp)
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
575 *lenp = size;
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
576 return 1;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
577 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
578
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
579 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
580 buffer_getcharbuf(PyBufferObject *self, int idx, const char **pp)
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
581 {
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
582 void *ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
583 int size;
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
584 if ( idx != 0 ) {
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
585 PyErr_SetString(PyExc_SystemError,
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
586 "accessing non-existent buffer segment");
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
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587 return -1;
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
588 }
31640
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
589 if (!get_buf(self, &ptr, &size))
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
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590 return -1;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
591 *pp = (const char *)ptr;
42f8820686c9 Make buffer objects based on mutable objects (like array) safe.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 31639
diff changeset
592 return size;
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
593 }
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
594
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
595
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
596 static PySequenceMethods buffer_as_sequence = {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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597 (inquiry)buffer_length, /*sq_length*/
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Guido van Rossum <guido@python.org>
parents:
diff changeset
598 (binaryfunc)buffer_concat, /*sq_concat*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
599 (intargfunc)buffer_repeat, /*sq_repeat*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
600 (intargfunc)buffer_item, /*sq_item*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
601 (intintargfunc)buffer_slice, /*sq_slice*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
602 (intobjargproc)buffer_ass_item, /*sq_ass_item*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
603 (intintobjargproc)buffer_ass_slice, /*sq_ass_slice*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
604 };
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
605
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
606 static PyBufferProcs buffer_as_buffer = {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
607 (getreadbufferproc)buffer_getreadbuf,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
608 (getwritebufferproc)buffer_getwritebuf,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
609 (getsegcountproc)buffer_getsegcount,
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
parents: 9286
diff changeset
610 (getcharbufferproc)buffer_getcharbuf,
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
611 };
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
612
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
613 PyTypeObject PyBuffer_Type = {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
614 PyObject_HEAD_INIT(&PyType_Type)
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
615 0,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
616 "buffer",
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
617 sizeof(PyBufferObject),
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
618 0,
18933
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
619 (destructor)buffer_dealloc, /* tp_dealloc */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
620 0, /* tp_print */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
621 0, /* tp_getattr */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
622 0, /* tp_setattr */
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
623 (cmpfunc)buffer_compare, /* tp_compare */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
624 (reprfunc)buffer_repr, /* tp_repr */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
625 0, /* tp_as_number */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
626 &buffer_as_sequence, /* tp_as_sequence */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
627 0, /* tp_as_mapping */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
628 (hashfunc)buffer_hash, /* tp_hash */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
629 0, /* tp_call */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
630 (reprfunc)buffer_str, /* tp_str */
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Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
631 PyObject_GenericGetAttr, /* tp_getattro */
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
632 0, /* tp_setattro */
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
633 &buffer_as_buffer, /* tp_as_buffer */
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
634 Py_TPFLAGS_DEFAULT, /* tp_flags */
23868
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
635 buffer_doc, /* tp_doc */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
636 0, /* tp_traverse */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
637 0, /* tp_clear */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
638 0, /* tp_richcompare */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
639 0, /* tp_weaklistoffset */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
640 0, /* tp_iter */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
641 0, /* tp_iternext */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
642 0, /* tp_methods */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
643 0, /* tp_members */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
644 0, /* tp_getset */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
645 0, /* tp_base */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
646 0, /* tp_dict */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
647 0, /* tp_descr_get */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
648 0, /* tp_descr_set */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
649 0, /* tp_dictoffset */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
650 0, /* tp_init */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
651 0, /* tp_alloc */
8e6760bf1884 SF patch 568629 by Oren Tirosh: types made callable.
Guido van Rossum <guido@python.org>
parents: 22651
diff changeset
652 buffer_new, /* tp_new */
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
653 };