Mercurial > cpython-lru_cache-weakref

annotate Objects/bufferobject.c @ 14150:302dfd53b3c8 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Make sure Thomas Wouters has enough to do. ;-) (Some of this is in-progress; this also serves as a reminded to me to check this out once it is written.)
author Fred Drake <fdrake@acm.org>
date Thu, 24 Aug 2000 00:50:27 +0000
parents f3d5f71ccbb4
children 6f6f965c5e2d
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Buffer object implementation */
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12
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13 #include "Python.h"
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14
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15
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16 typedef struct {
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17 PyObject_HEAD
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18 PyObject *b_base;
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19 void *b_ptr;
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20 int b_size;
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21 int b_readonly;
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22 #ifdef CACHE_HASH
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23 long b_hash;
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24 #endif
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25 } PyBufferObject;
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26
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27
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28 static PyObject *
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29 _PyBuffer_FromMemory(PyObject *base, void *ptr, int size, int readonly)
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30 {
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31 PyBufferObject * b;
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32
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33 if ( size < 0 ) {
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34 PyErr_SetString(PyExc_ValueError,
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35 "size must be zero or positive");
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36 return NULL;
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37 }
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38
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39 b = PyObject_NEW(PyBufferObject, &PyBuffer_Type);
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40 if ( b == NULL )
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41 return NULL;
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42
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43 Py_XINCREF(base);
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44 b->b_base = base;
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45 b->b_ptr = ptr;
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46 b->b_size = size;
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47 b->b_readonly = readonly;
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48 #ifdef CACHE_HASH
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49 b->b_hash = -1;
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50 #endif
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51
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52 return (PyObject *) b;
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53 }
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54
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55 static PyObject *
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56 _PyBuffer_FromObject(PyObject *base, int offset, int size,
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57 getreadbufferproc proc, int readonly)
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58 {
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59 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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60 void *p;
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61 int count;
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62
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63 if ( offset < 0 ) {
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64 PyErr_SetString(PyExc_ValueError,
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65 "offset must be zero or positive");
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66 return NULL;
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67 }
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68
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69 if ( (*pb->bf_getsegcount)(base, NULL) != 1 )
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70 {
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71 PyErr_SetString(PyExc_TypeError,
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72 "single-segment buffer object expected");
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73 return NULL;
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74 }
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75 if ( (count = (*proc)(base, 0, &p)) < 0 )
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76 return NULL;
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77
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78 /* apply constraints to the start/end */
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79 if ( size == Py_END_OF_BUFFER || size < 0 )
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80 size = count;
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81 if ( offset > count )
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82 offset = count;
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83 if ( offset + size > count )
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84 size = count - offset;
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85
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86 /* if the base object is another buffer, then "deref" it */
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87 if ( PyBuffer_Check(base) )
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88 base = ((PyBufferObject *)base)->b_base;
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89
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90 return _PyBuffer_FromMemory(base, (char *)p + offset, size, readonly);
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91 }
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92
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93
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94 PyObject *
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95 PyBuffer_FromObject(PyObject *base, int offset, int size)
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96 {
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97 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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98
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99 if ( pb == NULL ||
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100 pb->bf_getreadbuffer == NULL ||
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101 pb->bf_getsegcount == NULL )
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102 {
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103 PyErr_SetString(PyExc_TypeError, "buffer object expected");
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104 return NULL;
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105 }
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106
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107 return _PyBuffer_FromObject(base, offset, size,
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108 pb->bf_getreadbuffer, 1);
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109 }
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110
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111 PyObject *
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112 PyBuffer_FromReadWriteObject(PyObject *base, int offset, int size)
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113 {
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114 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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115
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116 if ( pb == NULL ||
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117 pb->bf_getwritebuffer == NULL ||
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118 pb->bf_getsegcount == NULL )
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119 {
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120 PyErr_SetString(PyExc_TypeError, "buffer object expected");
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121 return NULL;
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122 }
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123
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124 return _PyBuffer_FromObject(base, offset, size,
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125 (getreadbufferproc)pb->bf_getwritebuffer,
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126 0);
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127 }
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128
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129 PyObject *
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130 PyBuffer_FromMemory(void *ptr, int size)
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131 {
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132 return _PyBuffer_FromMemory(NULL, ptr, size, 1);
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133 }
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134
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135 PyObject *
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136 PyBuffer_FromReadWriteMemory(void *ptr, int size)
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137 {
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138 return _PyBuffer_FromMemory(NULL, ptr, size, 0);
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139 }
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140
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141 PyObject *
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142 PyBuffer_New(int size)
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143 {
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144 PyObject *o;
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145 PyBufferObject * b;
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146
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147 if (size < 0) {
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148 PyErr_SetString(PyExc_ValueError,
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149 "size must be zero or positive");
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150 return NULL;
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151 }
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152 /* PyObject_New is inlined */
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153 o = PyObject_MALLOC(sizeof(*b) + size);
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154 if ( o == NULL )
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155 return PyErr_NoMemory();
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156 b = (PyBufferObject *) PyObject_INIT(o, &PyBuffer_Type);
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157
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158 b->b_base = NULL;
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159 b->b_ptr = (void *)(b + 1);
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160 b->b_size = size;
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161 b->b_readonly = 0;
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162 #ifdef CACHE_HASH
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163 b->b_hash = -1;
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164 #endif
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165
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166 return o;
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167 }
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168
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169 /* Methods */
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170
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171 static void
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172 buffer_dealloc(PyBufferObject *self)
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173 {
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174 Py_XDECREF(self->b_base);
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175 PyObject_DEL(self);
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176 }
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177
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178 static int
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179 buffer_compare(PyBufferObject *self, PyBufferObject *other)
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180 {
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181 int len_self = self->b_size;
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182 int len_other = other->b_size;
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183 int min_len = (len_self < len_other) ? len_self : len_other;
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184 int cmp;
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185 if (min_len > 0) {
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186 cmp = memcmp(self->b_ptr, other->b_ptr, min_len);
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187 if (cmp != 0)
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188 return cmp;
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189 }
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190 return (len_self < len_other) ? -1 : (len_self > len_other) ? 1 : 0;
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191 }
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192
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193 static PyObject *
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194 buffer_repr(PyBufferObject *self)
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195 {
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196 char buf[300];
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197 char *status = self->b_readonly ? "read-only" : "read-write";
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198
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199 if ( self->b_base == NULL )
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200 {
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
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201 sprintf(buf, "<%s buffer ptr %p, size %d at %p>",
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202 status,
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203 self->b_ptr,
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204 self->b_size,
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205 self);
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206 }
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207 else
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208 {
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209 sprintf(buf, "<%s buffer for %p, ptr %p, size %d at %p>",
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210 status,
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211 self->b_base,
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212 self->b_ptr,
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213 self->b_size,
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214 self);
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215 }
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216
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217 return PyString_FromString(buf);
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218 }
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219
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220 static long
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221 buffer_hash(PyBufferObject *self)
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222 {
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223 register int len;
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224 register unsigned char *p;
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225 register long x;
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226
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227 #ifdef CACHE_HASH
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228 if ( self->b_hash != -1 )
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229 return self->b_hash;
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230 #endif
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231
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232 if ( !self->b_readonly )
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233 {
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234 /* ### use different wording, since this is conditional? */
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235 PyErr_SetString(PyExc_TypeError, "unhashable type");
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236 return -1;
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237 }
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238
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239 len = self->b_size;
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240 p = (unsigned char *) self->b_ptr;
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241 x = *p << 7;
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242 while (--len >= 0)
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243 x = (1000003*x) ^ *p++;
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244 x ^= self->b_size;
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245 if (x == -1)
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246 x = -2;
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diff changeset
247 #ifdef CACHE_HASH
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248 self->b_hash = x;
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diff changeset
249 #endif
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250 return x;
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251 }
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252
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253 static PyObject *
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diff changeset
254 buffer_str(PyBufferObject *self)
9278
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255 {
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diff changeset
256 return PyString_FromStringAndSize(self->b_ptr, self->b_size);
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257 }
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258
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diff changeset
259 /* Sequence methods */
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260
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261 static int
13449
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262 buffer_length(PyBufferObject *self)
9278
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263 {
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264 return self->b_size;
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265 }
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266
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diff changeset
267 static PyObject *
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268 buffer_concat(PyBufferObject *self, PyObject *other)
9278
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269 {
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270 PyBufferProcs *pb = other->ob_type->tp_as_buffer;
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271 char *p1;
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272 void *p2;
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273 PyObject *ob;
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diff changeset
274 int count;
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275
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276 if ( pb == NULL ||
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277 pb->bf_getreadbuffer == NULL ||
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278 pb->bf_getsegcount == NULL )
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diff changeset
279 {
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280 PyErr_BadArgument();
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diff changeset
281 return NULL;
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diff changeset
282 }
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283 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
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284 {
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diff changeset
285 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
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parents: 10427
diff changeset
286 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
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diff changeset
287 "single-segment buffer object expected");
9278
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288 return NULL;
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289 }
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290
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291 /* optimize special case */
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292 if ( self->b_size == 0 )
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293 {
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diff changeset
294 Py_INCREF(other);
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295 return other;
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296 }
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297
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298 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &p2)) < 0 )
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299 return NULL;
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parents:
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300
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parents:
diff changeset
301 /* optimize special case */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
302 if ( count == 0 )
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303 {
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parents:
diff changeset
304 Py_INCREF(self);
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parents:
diff changeset
305 return (PyObject *)self;
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parents:
diff changeset
306 }
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parents:
diff changeset
307
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parents:
diff changeset
308 ob = PyString_FromStringAndSize(NULL, self->b_size + count);
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parents:
diff changeset
309 p1 = PyString_AS_STRING(ob);
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parents:
diff changeset
310 memcpy(p1, self->b_ptr, self->b_size);
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Guido van Rossum <guido@python.org>
parents:
diff changeset
311 memcpy(p1 + self->b_size, p2, count);
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Guido van Rossum <guido@python.org>
parents:
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312
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313 /* there is an extra byte in the string object, so this is safe */
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314 p1[self->b_size + count] = '\0';
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315
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316 return ob;
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parents:
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317 }
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318
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319 static PyObject *
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320 buffer_repeat(PyBufferObject *self, int count)
9278
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321 {
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322 PyObject *ob;
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323 register char *p;
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324 void *ptr = self->b_ptr;
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325 int size = self->b_size;
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326
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327 if ( count < 0 )
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328 count = 0;
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329 ob = PyString_FromStringAndSize(NULL, size * count);
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330 if ( ob == NULL )
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331 return NULL;
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332
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333 p = PyString_AS_STRING(ob);
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Guido van Rossum <guido@python.org>
parents:
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334 while ( count-- )
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Guido van Rossum <guido@python.org>
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335 {
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Guido van Rossum <guido@python.org>
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336 memcpy(p, ptr, size);
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337 p += size;
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338 }
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parents:
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339
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340 /* there is an extra byte in the string object, so this is safe */
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Guido van Rossum <guido@python.org>
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341 *p = '\0';
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Guido van Rossum <guido@python.org>
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342
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Guido van Rossum <guido@python.org>
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343 return ob;
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Guido van Rossum <guido@python.org>
parents:
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344 }
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Guido van Rossum <guido@python.org>
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345
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346 static PyObject *
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Fred Drake <fdrake@acm.org>
parents: 13256
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347 buffer_item(PyBufferObject *self, int idx)
9278
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348 {
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349 if ( idx < 0 || idx >= self->b_size )
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350 {
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351 PyErr_SetString(PyExc_IndexError, "buffer index out of range");
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352 return NULL;
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parents:
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353 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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354 return PyString_FromStringAndSize((char *)self->b_ptr + idx, 1);
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Guido van Rossum <guido@python.org>
parents:
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355 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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356
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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357 static PyObject *
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Fred Drake <fdrake@acm.org>
parents: 13256
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358 buffer_slice(PyBufferObject *self, int left, int right)
9278
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Guido van Rossum <guido@python.org>
parents:
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359 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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360 if ( left < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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361 left = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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362 if ( right < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
363 right = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
364 if ( right > self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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365 right = self->b_size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
366 if ( left == 0 && right == self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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367 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
368 /* same as self */
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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369 Py_INCREF(self);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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370 return (PyObject *)self;
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 if ( right < left )
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parents:
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373 right = left;
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374 return PyString_FromStringAndSize((char *)self->b_ptr + left,
62781914fadb Folded long lines.
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diff changeset
375 right - left);
9278
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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
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
378 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
379 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
380 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
381 PyBufferProcs *pb;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
382 void *p;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
383 int count;
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 if ( self->b_readonly ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
386 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
387 "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
388 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
389 }
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 if (idx < 0 || idx >= self->b_size) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
392 PyErr_SetString(PyExc_IndexError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
393 "buffer assignment index out of range");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
394 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
395 }
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 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
398 if ( pb == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
399 pb->bf_getreadbuffer == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
400 pb->bf_getsegcount == NULL )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
401 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
402 PyErr_BadArgument();
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
403 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
404 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
405 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
406 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
407 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
408 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
409 "single-segment buffer object expected");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
410 return -1;
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
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
413 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &p)) < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
414 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
415 if ( count != 1 ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
416 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
417 "right operand must be a single byte");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
418 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
419 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
420
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
421 ((char *)self->b_ptr)[idx] = *(char *)p;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
422 return 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
423 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
424
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
425 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
426 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
427 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
428 PyBufferProcs *pb;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
429 void *p;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
430 int slice_len;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
431 int count;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
432
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
433 if ( self->b_readonly ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
434 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
435 "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
436 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
437 }
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 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
440 if ( pb == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
441 pb->bf_getreadbuffer == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
442 pb->bf_getsegcount == NULL )
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 PyErr_BadArgument();
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
445 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
446 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
447 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
448 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
449 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
450 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
451 "single-segment buffer object expected");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
452 return -1;
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 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &p)) < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
455 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
456
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
457 if ( left < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
458 left = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
459 else if ( left > self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
460 left = self->b_size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
461 if ( right < left )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
462 right = left;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
463 else if ( right > self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
464 right = self->b_size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
465 slice_len = right - left;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
466
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
467 if ( count != slice_len ) {
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
468 PyErr_SetString(
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
469 PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
470 "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
471 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
472 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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473
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474 if ( slice_len )
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475 memcpy((char *)self->b_ptr + left, p, slice_len);
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476
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477 return 0;
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478 }
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479
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480 /* Buffer methods */
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481
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482 static int
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483 buffer_getreadbuf(PyBufferObject *self, int idx, void **pp)
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484 {
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485 if ( idx != 0 ) {
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486 PyErr_SetString(PyExc_SystemError,
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487 "accessing non-existent buffer segment");
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488 return -1;
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489 }
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490 *pp = self->b_ptr;
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491 return self->b_size;
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492 }
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493
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494 static int
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Fred Drake <fdrake@acm.org>
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495 buffer_getwritebuf(PyBufferObject *self, int idx, void **pp)
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496 {
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497 if ( self->b_readonly )
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498 {
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499 PyErr_SetString(PyExc_TypeError, "buffer is read-only");
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500 return -1;
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501 }
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502 return buffer_getreadbuf(self, idx, pp);
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503 }
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Guido van Rossum <guido@python.org>
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504
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505 static int
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0409a98cd582 ANSI-fication of the sources.
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506 buffer_getsegcount(PyBufferObject *self, int *lenp)
9278
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507 {
c39218a68df1 Add Greg Stein's buffer object API.
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508 if ( lenp )
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509 *lenp = self->b_size;
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510 return 1;
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511 }
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512
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513 static int
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Fred Drake <fdrake@acm.org>
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514 buffer_getcharbuf(PyBufferObject *self, int idx, const char **pp)
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083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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515 {
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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516 if ( idx != 0 ) {
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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517 PyErr_SetString(PyExc_SystemError,
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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518 "accessing non-existent buffer segment");
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Guido van Rossum <guido@python.org>
parents: 9286
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519 return -1;
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
Guido van Rossum <guido@python.org>
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520 }
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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521 *pp = (const char *)self->b_ptr;
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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522 return self->b_size;
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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523 }
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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parents: 9286
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524
9278
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525
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526 static PySequenceMethods buffer_as_sequence = {
c39218a68df1 Add Greg Stein's buffer object API.
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527 (inquiry)buffer_length, /*sq_length*/
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Guido van Rossum <guido@python.org>
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528 (binaryfunc)buffer_concat, /*sq_concat*/
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Guido van Rossum <guido@python.org>
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529 (intargfunc)buffer_repeat, /*sq_repeat*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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530 (intargfunc)buffer_item, /*sq_item*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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531 (intintargfunc)buffer_slice, /*sq_slice*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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532 (intobjargproc)buffer_ass_item, /*sq_ass_item*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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533 (intintobjargproc)buffer_ass_slice, /*sq_ass_slice*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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534 };
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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535
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Guido van Rossum <guido@python.org>
parents:
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536 static PyBufferProcs buffer_as_buffer = {
c39218a68df1 Add Greg Stein's buffer object API.
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537 (getreadbufferproc)buffer_getreadbuf,
c39218a68df1 Add Greg Stein's buffer object API.
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538 (getwritebufferproc)buffer_getwritebuf,
c39218a68df1 Add Greg Stein's buffer object API.
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parents:
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539 (getsegcountproc)buffer_getsegcount,
9305
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540 (getcharbufferproc)buffer_getcharbuf,
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541 };
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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542
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Guido van Rossum <guido@python.org>
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543 PyTypeObject PyBuffer_Type = {
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544 PyObject_HEAD_INIT(&PyType_Type)
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545 0,
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546 "buffer",
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parents:
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547 sizeof(PyBufferObject),
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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548 0,
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Guido van Rossum <guido@python.org>
parents:
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549 (destructor)buffer_dealloc, /*tp_dealloc*/
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Guido van Rossum <guido@python.org>
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550 0, /*tp_print*/
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Guido van Rossum <guido@python.org>
parents:
diff changeset
551 0, /*tp_getattr*/
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Guido van Rossum <guido@python.org>
parents:
diff changeset
552 0, /*tp_setattr*/
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Guido van Rossum <guido@python.org>
parents:
diff changeset
553 (cmpfunc)buffer_compare, /*tp_compare*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
554 (reprfunc)buffer_repr, /*tp_repr*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
555 0, /*tp_as_number*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
556 &buffer_as_sequence, /*tp_as_sequence*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
557 0, /*tp_as_mapping*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
558 (hashfunc)buffer_hash, /*tp_hash*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
559 0, /*tp_call*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
560 (reprfunc)buffer_str, /*tp_str*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
561 0, /*tp_getattro*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
562 0, /*tp_setattro*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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563 &buffer_as_buffer, /*tp_as_buffer*/
9305
083efa076366 Greg Stein: Implement the new bf_getcharbuffer function, indicating
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564 Py_TPFLAGS_DEFAULT, /*tp_flags*/
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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565 0, /*tp_doc*/
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
566 };