Mercurial > cpython-lru_cache-weakref

annotate Objects/bufferobject.c @ 22750:522405ab35c1 legacy-trunk

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Note that it is illegal to delete a cell variable. Note that deleteing an unbound local will raise a NameError.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Mon, 01 Apr 2002 21:15:14 +0000
parents f3a416b178c4
children 8e6760bf1884
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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_readonly;
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13 long b_hash;
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14 } PyBufferObject;
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16
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17 static PyObject *
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18 _PyBuffer_FromMemory(PyObject *base, void *ptr, int size, int readonly)
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19 {
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20 PyBufferObject * b;
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21
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22 if ( size < 0 ) {
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23 PyErr_SetString(PyExc_ValueError,
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24 "size must be zero or positive");
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25 return NULL;
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26 }
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27
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28 b = PyObject_NEW(PyBufferObject, &PyBuffer_Type);
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29 if ( b == NULL )
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30 return NULL;
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31
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32 Py_XINCREF(base);
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33 b->b_base = base;
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34 b->b_ptr = ptr;
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35 b->b_size = size;
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36 b->b_readonly = readonly;
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37 b->b_hash = -1;
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38
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39 return (PyObject *) b;
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40 }
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41
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42 static PyObject *
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43 _PyBuffer_FromObject(PyObject *base, int offset, int size,
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44 getreadbufferproc proc, int readonly)
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45 {
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46 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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47 void *p;
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48 int count;
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49
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50 if ( offset < 0 ) {
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51 PyErr_SetString(PyExc_ValueError,
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52 "offset must be zero or positive");
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53 return NULL;
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54 }
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55
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56 if ( (*pb->bf_getsegcount)(base, NULL) != 1 )
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57 {
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58 PyErr_SetString(PyExc_TypeError,
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59 "single-segment buffer object expected");
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60 return NULL;
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61 }
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62 if ( (count = (*proc)(base, 0, &p)) < 0 )
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63 return NULL;
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64
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65 /* apply constraints to the start/end */
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66 if ( size == Py_END_OF_BUFFER || size < 0 )
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67 size = count;
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68 if ( offset > count )
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69 offset = count;
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70 if ( offset + size > count )
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71 size = count - offset;
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72
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73 /* if the base object is another buffer, then "deref" it,
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74 * except if the base of the other buffer is NULL
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75 */
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76 if ( PyBuffer_Check(base) && (((PyBufferObject *)base)->b_base) )
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77 base = ((PyBufferObject *)base)->b_base;
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78
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79 return _PyBuffer_FromMemory(base, (char *)p + offset, size, readonly);
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80 }
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81
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82
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83 PyObject *
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84 PyBuffer_FromObject(PyObject *base, int offset, int size)
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85 {
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86 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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87
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88 if ( pb == NULL ||
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89 pb->bf_getreadbuffer == NULL ||
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90 pb->bf_getsegcount == NULL )
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91 {
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92 PyErr_SetString(PyExc_TypeError, "buffer object expected");
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93 return NULL;
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94 }
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95
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96 return _PyBuffer_FromObject(base, offset, size,
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97 pb->bf_getreadbuffer, 1);
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98 }
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99
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100 PyObject *
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101 PyBuffer_FromReadWriteObject(PyObject *base, int offset, int size)
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102 {
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103 PyBufferProcs *pb = base->ob_type->tp_as_buffer;
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104
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105 if ( pb == NULL ||
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106 pb->bf_getwritebuffer == NULL ||
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107 pb->bf_getsegcount == NULL )
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108 {
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109 PyErr_SetString(PyExc_TypeError, "buffer object expected");
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110 return NULL;
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111 }
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112
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113 return _PyBuffer_FromObject(base, offset, size,
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114 (getreadbufferproc)pb->bf_getwritebuffer,
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115 0);
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116 }
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117
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118 PyObject *
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119 PyBuffer_FromMemory(void *ptr, int size)
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120 {
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121 return _PyBuffer_FromMemory(NULL, ptr, size, 1);
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122 }
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123
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124 PyObject *
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125 PyBuffer_FromReadWriteMemory(void *ptr, int size)
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126 {
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127 return _PyBuffer_FromMemory(NULL, ptr, size, 0);
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128 }
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129
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130 PyObject *
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131 PyBuffer_New(int size)
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132 {
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133 PyObject *o;
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134 PyBufferObject * b;
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135
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136 if (size < 0) {
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137 PyErr_SetString(PyExc_ValueError,
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138 "size must be zero or positive");
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139 return NULL;
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140 }
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141 /* PyObject_New is inlined */
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142 o = PyObject_MALLOC(sizeof(*b) + size);
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143 if ( o == NULL )
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144 return PyErr_NoMemory();
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145 b = (PyBufferObject *) PyObject_INIT(o, &PyBuffer_Type);
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146
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147 b->b_base = NULL;
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148 b->b_ptr = (void *)(b + 1);
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149 b->b_size = size;
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150 b->b_readonly = 0;
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151 b->b_hash = -1;
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152
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Moshe Zadka <moshez@math.huji.ac.il>
parents: 13449
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153 return o;
9278
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154 }
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parents:
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155
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parents:
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156 /* Methods */
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157
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parents:
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158 static void
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159 buffer_dealloc(PyBufferObject *self)
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160 {
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parents:
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161 Py_XDECREF(self->b_base);
12576
1c7c2dd1beb1 Vladimir Marangozov's long-awaited malloc restructuring.
Guido van Rossum <guido@python.org>
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162 PyObject_DEL(self);
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163 }
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164
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165 static int
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166 buffer_compare(PyBufferObject *self, PyBufferObject *other)
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167 {
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168 int len_self = self->b_size;
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169 int len_other = other->b_size;
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170 int min_len = (len_self < len_other) ? len_self : len_other;
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171 int cmp;
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172 if (min_len > 0) {
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173 cmp = memcmp(self->b_ptr, other->b_ptr, min_len);
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174 if (cmp != 0)
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Guido van Rossum <guido@python.org>
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175 return cmp;
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Guido van Rossum <guido@python.org>
parents:
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176 }
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177 return (len_self < len_other) ? -1 : (len_self > len_other) ? 1 : 0;
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178 }
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179
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180 static PyObject *
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181 buffer_repr(PyBufferObject *self)
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182 {
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183 char *status = self->b_readonly ? "read-only" : "read-write";
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184
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185 if ( self->b_base == NULL )
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Barry Warsaw <barry@python.org>
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186 return PyString_FromFormat("<%s buffer ptr %p, size %d at %p>",
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Barry Warsaw <barry@python.org>
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187 status,
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Barry Warsaw <barry@python.org>
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188 self->b_ptr,
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Barry Warsaw <barry@python.org>
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189 self->b_size,
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Barry Warsaw <barry@python.org>
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190 self);
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191 else
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192 return PyString_FromFormat(
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193 "<%s buffer for %p, ptr %p, size %d at %p>",
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194 status,
13210
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195 self->b_base,
ff243b0f16ee Trent Mick <trentm@activestate.com>:
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196 self->b_ptr,
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197 self->b_size,
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ff243b0f16ee Trent Mick <trentm@activestate.com>:
Fred Drake <fdrake@acm.org>
parents: 12576
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198 self);
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199 }
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200
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201 static long
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202 buffer_hash(PyBufferObject *self)
9278
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203 {
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Guido van Rossum <guido@python.org>
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204 register int len;
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Guido van Rossum <guido@python.org>
parents:
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205 register unsigned char *p;
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Guido van Rossum <guido@python.org>
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206 register long x;
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207
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208 if ( self->b_hash != -1 )
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Guido van Rossum <guido@python.org>
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209 return self->b_hash;
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210
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Guido van Rossum <guido@python.org>
parents:
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211 if ( !self->b_readonly )
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212 {
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parents:
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213 /* ### use different wording, since this is conditional? */
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214 PyErr_SetString(PyExc_TypeError, "unhashable type");
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215 return -1;
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parents:
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216 }
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217
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218 len = self->b_size;
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219 p = (unsigned char *) self->b_ptr;
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220 x = *p << 7;
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Guido van Rossum <guido@python.org>
parents:
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221 while (--len >= 0)
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Guido van Rossum <guido@python.org>
parents:
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222 x = (1000003*x) ^ *p++;
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223 x ^= self->b_size;
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Guido van Rossum <guido@python.org>
parents:
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224 if (x == -1)
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225 x = -2;
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226 self->b_hash = x;
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227 return x;
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parents:
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228 }
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229
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230 static PyObject *
13449
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parents: 13256
diff changeset
231 buffer_str(PyBufferObject *self)
9278
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232 {
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parents:
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233 return PyString_FromStringAndSize(self->b_ptr, self->b_size);
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Guido van Rossum <guido@python.org>
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234 }
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235
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Guido van Rossum <guido@python.org>
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236 /* Sequence methods */
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237
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238 static int
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239 buffer_length(PyBufferObject *self)
9278
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240 {
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241 return self->b_size;
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242 }
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Guido van Rossum <guido@python.org>
parents:
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243
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parents:
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244 static PyObject *
13449
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parents: 13256
diff changeset
245 buffer_concat(PyBufferObject *self, PyObject *other)
9278
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246 {
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247 PyBufferProcs *pb = other->ob_type->tp_as_buffer;
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248 char *p1;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
249 void *p2;
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Guido van Rossum <guido@python.org>
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diff changeset
250 PyObject *ob;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
251 int count;
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Guido van Rossum <guido@python.org>
parents:
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252
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Guido van Rossum <guido@python.org>
parents:
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253 if ( pb == NULL ||
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Guido van Rossum <guido@python.org>
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254 pb->bf_getreadbuffer == NULL ||
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Guido van Rossum <guido@python.org>
parents:
diff changeset
255 pb->bf_getsegcount == NULL )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
256 {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
257 PyErr_BadArgument();
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Guido van Rossum <guido@python.org>
parents:
diff changeset
258 return NULL;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
259 }
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Guido van Rossum <guido@python.org>
parents:
diff changeset
260 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
261 {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
262 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
263 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
264 "single-segment buffer object expected");
9278
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265 return NULL;
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parents:
diff changeset
266 }
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Guido van Rossum <guido@python.org>
parents:
diff changeset
267
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parents:
diff changeset
268 /* optimize special case */
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parents:
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269 if ( self->b_size == 0 )
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parents:
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270 {
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parents:
diff changeset
271 Py_INCREF(other);
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parents:
diff changeset
272 return other;
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parents:
diff changeset
273 }
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parents:
diff changeset
274
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diff changeset
275 if ( (count = (*pb->bf_getreadbuffer)(other, 0, &p2)) < 0 )
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parents:
diff changeset
276 return NULL;
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parents:
diff changeset
277
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parents:
diff changeset
278 /* optimize special case */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
279 if ( count == 0 )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
280 {
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parents:
diff changeset
281 Py_INCREF(self);
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parents:
diff changeset
282 return (PyObject *)self;
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parents:
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283 }
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parents:
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284
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285 ob = PyString_FromStringAndSize(NULL, self->b_size + count);
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parents:
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286 p1 = PyString_AS_STRING(ob);
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parents:
diff changeset
287 memcpy(p1, self->b_ptr, self->b_size);
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parents:
diff changeset
288 memcpy(p1 + self->b_size, p2, count);
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parents:
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289
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parents:
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290 /* there is an extra byte in the string object, so this is safe */
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parents:
diff changeset
291 p1[self->b_size + count] = '\0';
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parents:
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292
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293 return ob;
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parents:
diff changeset
294 }
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diff changeset
295
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diff changeset
296 static PyObject *
13449
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297 buffer_repeat(PyBufferObject *self, int count)
9278
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298 {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
299 PyObject *ob;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
300 register char *p;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
301 void *ptr = self->b_ptr;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
302 int size = self->b_size;
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parents:
diff changeset
303
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Guido van Rossum <guido@python.org>
parents:
diff changeset
304 if ( count < 0 )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
305 count = 0;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
306 ob = PyString_FromStringAndSize(NULL, size * count);
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Guido van Rossum <guido@python.org>
parents:
diff changeset
307 if ( ob == NULL )
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Guido van Rossum <guido@python.org>
parents:
diff changeset
308 return NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
309
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Guido van Rossum <guido@python.org>
parents:
diff changeset
310 p = PyString_AS_STRING(ob);
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Guido van Rossum <guido@python.org>
parents:
diff changeset
311 while ( count-- )
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parents:
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312 {
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Guido van Rossum <guido@python.org>
parents:
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313 memcpy(p, ptr, size);
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Guido van Rossum <guido@python.org>
parents:
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314 p += size;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
315 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
316
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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317 /* there is an extra byte in the string object, so this is safe */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
318 *p = '\0';
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
319
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Guido van Rossum <guido@python.org>
parents:
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320 return ob;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
321 }
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Guido van Rossum <guido@python.org>
parents:
diff changeset
322
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parents:
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323 static PyObject *
13449
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parents: 13256
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324 buffer_item(PyBufferObject *self, int idx)
9278
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Guido van Rossum <guido@python.org>
parents:
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325 {
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Guido van Rossum <guido@python.org>
parents:
diff changeset
326 if ( idx < 0 || idx >= self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
327 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
328 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
329 return NULL;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
330 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
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331 return PyString_FromStringAndSize((char *)self->b_ptr + idx, 1);
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
332 }
c39218a68df1 Add Greg Stein's buffer object API.
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:
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334 static PyObject *
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Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
335 buffer_slice(PyBufferObject *self, int left, int right)
9278
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Guido van Rossum <guido@python.org>
parents:
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336 {
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Guido van Rossum <guido@python.org>
parents:
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337 if ( left < 0 )
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Guido van Rossum <guido@python.org>
parents:
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338 left = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
339 if ( right < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
340 right = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
341 if ( right > self->b_size )
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Guido van Rossum <guido@python.org>
parents:
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342 right = self->b_size;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
343 if ( left == 0 && right == self->b_size )
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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>
parents:
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345 /* same as self */
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Guido van Rossum <guido@python.org>
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346 Py_INCREF(self);
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Guido van Rossum <guido@python.org>
parents:
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347 return (PyObject *)self;
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Guido van Rossum <guido@python.org>
parents:
diff changeset
348 }
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Guido van Rossum <guido@python.org>
parents:
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349 if ( right < left )
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Guido van Rossum <guido@python.org>
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350 right = left;
10460
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Guido van Rossum <guido@python.org>
parents: 10427
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351 return PyString_FromStringAndSize((char *)self->b_ptr + left,
62781914fadb Folded long lines.
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parents: 10427
diff changeset
352 right - left);
9278
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Guido van Rossum <guido@python.org>
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
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
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355 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
356 buffer_ass_item(PyBufferObject *self, int idx, PyObject *other)
9278
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Guido van Rossum <guido@python.org>
parents:
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357 {
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Guido van Rossum <guido@python.org>
parents:
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358 PyBufferProcs *pb;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
359 void *p;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
360 int count;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
361
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
362 if ( self->b_readonly ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
363 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
364 "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
365 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
366 }
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 if (idx < 0 || idx >= self->b_size) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
369 PyErr_SetString(PyExc_IndexError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
370 "buffer assignment index out of range");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
371 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
372 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
373
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
374 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
375 if ( pb == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
376 pb->bf_getreadbuffer == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
377 pb->bf_getsegcount == NULL )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
378 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
379 PyErr_BadArgument();
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
380 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
381 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
382 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
383 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
384 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
385 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
386 "single-segment buffer object expected");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
387 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
388 }
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 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
391 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
392 if ( count != 1 ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
393 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
394 "right operand must be a single byte");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
395 return -1;
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 ((char *)self->b_ptr)[idx] = *(char *)p;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
399 return 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
400 }
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 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
403 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
404 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
405 PyBufferProcs *pb;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
406 void *p;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
407 int slice_len;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
408 int count;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
409
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
410 if ( self->b_readonly ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
411 PyErr_SetString(PyExc_TypeError,
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
412 "buffer is read-only");
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
413 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
414 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
415
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
416 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
417 if ( pb == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
418 pb->bf_getreadbuffer == NULL ||
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
419 pb->bf_getsegcount == NULL )
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 PyErr_BadArgument();
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
422 return -1;
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 if ( (*pb->bf_getsegcount)(other, NULL) != 1 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
425 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
426 /* ### use a different exception type/message? */
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
427 PyErr_SetString(PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
428 "single-segment buffer object expected");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
429 return -1;
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 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
432 return -1;
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 if ( left < 0 )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
435 left = 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
436 else if ( left > self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
437 left = self->b_size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
438 if ( right < left )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
439 right = left;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
440 else if ( right > self->b_size )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
441 right = self->b_size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
442 slice_len = right - left;
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 if ( count != slice_len ) {
10460
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
445 PyErr_SetString(
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
446 PyExc_TypeError,
62781914fadb Folded long lines.
Guido van Rossum <guido@python.org>
parents: 10427
diff changeset
447 "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
448 return -1;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
449 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
450
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
451 if ( slice_len )
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
452 memcpy((char *)self->b_ptr + left, p, slice_len);
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 return 0;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
455 }
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 /* Buffer methods */
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 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
460 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
461 {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
462 if ( idx != 0 ) {
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
463 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
464 "accessing non-existent buffer segment");
9278
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
465 return -1;
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 *pp = self->b_ptr;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
468 return self->b_size;
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
469 }
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
470
c39218a68df1 Add Greg Stein's buffer object API.
Guido van Rossum <guido@python.org>
parents:
diff changeset
471 static int
13449
0409a98cd582 ANSI-fication of the sources.
Fred Drake <fdrake@acm.org>
parents: 13256
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472 buffer_getwritebuf(PyBufferObject *self, int idx, void **pp)
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473 {
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474 if ( self->b_readonly )
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475 {
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476 PyErr_SetString(PyExc_TypeError, "buffer is read-only");
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477 return -1;
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478 }
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479 return buffer_getreadbuf(self, idx, pp);
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480 }
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481
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482 static int
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483 buffer_getsegcount(PyBufferObject *self, int *lenp)
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484 {
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485 if ( lenp )
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486 *lenp = self->b_size;
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487 return 1;
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488 }
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489
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490 static int
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491 buffer_getcharbuf(PyBufferObject *self, int idx, const char **pp)
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492 {
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493 if ( idx != 0 ) {
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494 PyErr_SetString(PyExc_SystemError,
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495 "accessing non-existent buffer segment");
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496 return -1;
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497 }
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498 *pp = (const char *)self->b_ptr;
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499 return self->b_size;
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500 }
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501
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502
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503 static PySequenceMethods buffer_as_sequence = {
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504 (inquiry)buffer_length, /*sq_length*/
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505 (binaryfunc)buffer_concat, /*sq_concat*/
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506 (intargfunc)buffer_repeat, /*sq_repeat*/
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507 (intargfunc)buffer_item, /*sq_item*/
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508 (intintargfunc)buffer_slice, /*sq_slice*/
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509 (intobjargproc)buffer_ass_item, /*sq_ass_item*/
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510 (intintobjargproc)buffer_ass_slice, /*sq_ass_slice*/
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511 };
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512
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513 static PyBufferProcs buffer_as_buffer = {
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514 (getreadbufferproc)buffer_getreadbuf,
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515 (getwritebufferproc)buffer_getwritebuf,
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516 (getsegcountproc)buffer_getsegcount,
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517 (getcharbufferproc)buffer_getcharbuf,
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518 };
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519
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520 PyTypeObject PyBuffer_Type = {
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521 PyObject_HEAD_INIT(&PyType_Type)
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522 0,
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523 "buffer",
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524 sizeof(PyBufferObject),
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525 0,
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526 (destructor)buffer_dealloc, /* tp_dealloc */
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527 0, /* tp_print */
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528 0, /* tp_getattr */
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529 0, /* tp_setattr */
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530 (cmpfunc)buffer_compare, /* tp_compare */
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531 (reprfunc)buffer_repr, /* tp_repr */
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532 0, /* tp_as_number */
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533 &buffer_as_sequence, /* tp_as_sequence */
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534 0, /* tp_as_mapping */
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535 (hashfunc)buffer_hash, /* tp_hash */
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536 0, /* tp_call */
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537 (reprfunc)buffer_str, /* tp_str */
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538 PyObject_GenericGetAttr, /* tp_getattro */
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539 0, /* tp_setattro */
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540 &buffer_as_buffer, /* tp_as_buffer */
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541 Py_TPFLAGS_DEFAULT, /* tp_flags */
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542 0, /* tp_doc */
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543 };