Mercurial > cpython-lru_cache-weakref
annotate Objects/memoryobject.c @ 48345:cb871f736be0
merge error: test.test_support is now test.support
| author | Amaury Forgeot d'Arc <amauryfa@gmail.com> |
|---|---|
| date | Thu, 19 Jun 2008 22:03:50 +0000 |
| parents | ac854cde3135 |
| children | bf50085fbcd3 |
| rev | line source |
|---|---|
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1 |
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2 /* Memoryview object implementation */ |
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3 |
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4 #include "Python.h" |
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6 static int |
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7 memory_getbuf(PyMemoryViewObject *self, Py_buffer *view, int flags) |
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8 { |
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9 if (view != NULL) |
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10 *view = self->view; |
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11 if (self->base == NULL) |
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12 return 0; |
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13 return self->base->ob_type->tp_as_buffer->bf_getbuffer(self->base, NULL, |
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14 PyBUF_FULL); |
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15 } |
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16 |
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17 static void |
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18 memory_releasebuf(PyMemoryViewObject *self, Py_buffer *view) |
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19 { |
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20 if (self->base != NULL) |
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21 PyObject_ReleaseBuffer(self->base, NULL); |
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22 } |
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23 |
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24 PyDoc_STRVAR(memory_doc, |
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25 "memoryview(object)\n\ |
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26 \n\ |
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27 Create a new memoryview object which references the given object."); |
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28 |
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29 PyObject * |
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30 PyMemoryView_FromMemory(Py_buffer *info) |
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31 { |
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32 PyMemoryViewObject *mview; |
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33 |
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34 mview = (PyMemoryViewObject *)PyObject_New(PyMemoryViewObject, |
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35 &PyMemoryView_Type); |
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36 if (mview == NULL) return NULL; |
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37 mview->base = NULL; |
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38 mview->view = *info; |
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39 return (PyObject *)mview; |
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40 } |
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41 |
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42 PyObject * |
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43 PyMemoryView_FromObject(PyObject *base) |
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44 { |
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45 PyMemoryViewObject *mview; |
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46 |
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47 if (!PyObject_CheckBuffer(base)) { |
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48 PyErr_SetString(PyExc_TypeError, |
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49 "cannot make memory view because object does " |
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50 "not have the buffer interface"); |
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51 return NULL; |
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52 } |
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53 |
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54 mview = (PyMemoryViewObject *)PyObject_New(PyMemoryViewObject, |
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55 &PyMemoryView_Type); |
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56 if (mview == NULL) return NULL; |
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57 |
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58 mview->base = NULL; |
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59 if (PyObject_GetBuffer(base, &(mview->view), PyBUF_FULL) < 0) { |
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60 Py_DECREF(mview); |
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61 return NULL; |
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62 } |
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63 |
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64 mview->base = base; |
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65 Py_INCREF(base); |
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66 return (PyObject *)mview; |
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67 } |
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68 |
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69 static PyObject * |
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70 memory_new(PyTypeObject *subtype, PyObject *args, PyObject *kwds) |
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71 { |
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72 PyObject *obj; |
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73 static char *kwlist[] = {"object", 0}; |
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74 |
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75 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:memoryview", kwlist, |
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76 &obj)) { |
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77 return NULL; |
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78 } |
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79 |
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80 return PyMemoryView_FromObject(obj); |
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81 } |
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82 |
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83 |
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84 static void |
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85 _strided_copy_nd(char *dest, char *src, int nd, Py_ssize_t *shape, |
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86 Py_ssize_t *strides, Py_ssize_t itemsize, char fort) |
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87 { |
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88 int k; |
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89 Py_ssize_t outstride; |
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90 |
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91 if (nd==0) { |
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92 memcpy(dest, src, itemsize); |
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93 } |
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94 else if (nd == 1) { |
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95 for (k = 0; k<shape[0]; k++) { |
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96 memcpy(dest, src, itemsize); |
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97 dest += itemsize; |
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98 src += strides[0]; |
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99 } |
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100 } |
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101 else { |
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102 if (fort == 'F') { |
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103 /* Copy first dimension first, |
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104 second dimension second, etc... |
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105 Set up the recursive loop backwards so that final |
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106 dimension is actually copied last. |
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107 */ |
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108 outstride = itemsize; |
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109 for (k=1; k<nd-1;k++) { |
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110 outstride *= shape[k]; |
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111 } |
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112 for (k=0; k<shape[nd-1]; k++) { |
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113 _strided_copy_nd(dest, src, nd-1, shape, |
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114 strides, itemsize, fort); |
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115 dest += outstride; |
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116 src += strides[nd-1]; |
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117 } |
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118 } |
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119 |
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120 else { |
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121 /* Copy last dimension first, |
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122 second-to-last dimension second, etc. |
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123 Set up the recursion so that the |
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124 first dimension is copied last |
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125 */ |
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126 outstride = itemsize; |
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127 for (k=1; k < nd; k++) { |
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128 outstride *= shape[k]; |
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129 } |
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130 for (k=0; k<shape[0]; k++) { |
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131 _strided_copy_nd(dest, src, nd-1, shape+1, |
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132 strides+1, itemsize, |
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133 fort); |
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134 dest += outstride; |
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135 src += strides[0]; |
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136 } |
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137 } |
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138 } |
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139 return; |
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140 } |
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141 |
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142 void _add_one_to_index_F(int nd, Py_ssize_t *index, Py_ssize_t *shape); |
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143 void _add_one_to_index_C(int nd, Py_ssize_t *index, Py_ssize_t *shape); |
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144 |
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145 static int |
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146 _indirect_copy_nd(char *dest, Py_buffer *view, char fort) |
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147 { |
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148 Py_ssize_t *indices; |
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149 int k; |
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150 Py_ssize_t elements; |
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151 char *ptr; |
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152 void (*func)(int, Py_ssize_t *, Py_ssize_t *); |
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153 |
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154 if (view->ndim > PY_SSIZE_T_MAX / sizeof(Py_ssize_t)) { |
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155 PyErr_NoMemory(); |
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156 return -1; |
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157 } |
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158 |
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159 indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*view->ndim); |
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160 if (indices == NULL) { |
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161 PyErr_NoMemory(); |
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162 return -1; |
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163 } |
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164 for (k=0; k<view->ndim;k++) { |
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165 indices[k] = 0; |
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166 } |
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167 |
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168 elements = 1; |
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169 for (k=0; k<view->ndim; k++) { |
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170 elements *= view->shape[k]; |
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171 } |
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172 if (fort == 'F') { |
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173 func = _add_one_to_index_F; |
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174 } |
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175 else { |
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176 func = _add_one_to_index_C; |
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177 } |
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178 while (elements--) { |
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179 func(view->ndim, indices, view->shape); |
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180 ptr = PyBuffer_GetPointer(view, indices); |
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181 memcpy(dest, ptr, view->itemsize); |
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182 dest += view->itemsize; |
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183 } |
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184 |
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185 PyMem_Free(indices); |
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186 return 0; |
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187 } |
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188 |
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189 /* |
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190 Get a the data from an object as a contiguous chunk of memory (in |
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191 either 'C' or 'F'ortran order) even if it means copying it into a |
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192 separate memory area. |
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193 |
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194 Returns a new reference to a Memory view object. If no copy is needed, |
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195 the memory view object points to the original memory and holds a |
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196 lock on the original. If a copy is needed, then the memory view object |
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197 points to a brand-new Bytes object (and holds a memory lock on it). |
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198 |
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199 buffertype |
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200 |
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201 PyBUF_READ buffer only needs to be read-only |
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202 PyBUF_WRITE buffer needs to be writable (give error if not contiguous) |
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203 PyBUF_SHADOW buffer needs to be writable so shadow it with |
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204 a contiguous buffer if it is not. The view will point to |
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205 the shadow buffer which can be written to and then |
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206 will be copied back into the other buffer when the memory |
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207 view is de-allocated. While the shadow buffer is |
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208 being used, it will have an exclusive write lock on |
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209 the original buffer. |
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210 */ |
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211 |
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212 PyObject * |
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213 PyMemoryView_GetContiguous(PyObject *obj, int buffertype, char fort) |
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214 { |
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215 PyMemoryViewObject *mem; |
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216 PyObject *bytes; |
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217 Py_buffer *view; |
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218 int flags; |
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219 char *dest; |
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220 |
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221 if (!PyObject_CheckBuffer(obj)) { |
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222 PyErr_SetString(PyExc_TypeError, |
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223 "object does not have the buffer interface"); |
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224 return NULL; |
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225 } |
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226 |
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227 mem = PyObject_New(PyMemoryViewObject, &PyMemoryView_Type); |
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228 if (mem == NULL) return NULL; |
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229 |
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230 view = &PyMemoryView(mem); |
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231 flags = PyBUF_FULL_RO; |
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232 switch(buffertype) { |
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233 case PyBUF_WRITE: |
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234 flags = PyBUF_FULL; |
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235 break; |
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236 } |
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237 |
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238 if (PyObject_GetBuffer(obj, view, flags) != 0) { |
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239 PyObject_DEL(mem); |
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240 return NULL; |
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241 } |
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242 |
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243 if (PyBuffer_IsContiguous(view, fort)) { |
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244 /* no copy needed */ |
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245 Py_INCREF(obj); |
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246 mem->base = obj; |
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247 return (PyObject *)mem; |
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248 } |
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249 /* otherwise a copy is needed */ |
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250 if (buffertype == PyBUF_WRITE) { |
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251 PyObject_DEL(mem); |
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252 PyErr_SetString(PyExc_BufferError, |
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253 "writable contiguous buffer requested " |
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254 "for a non-contiguousobject."); |
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255 return NULL; |
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256 } |
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257 bytes = PyByteArray_FromStringAndSize(NULL, view->len); |
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258 if (bytes == NULL) { |
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259 PyObject_ReleaseBuffer(obj, view); |
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260 return NULL; |
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261 } |
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262 dest = PyByteArray_AS_STRING(bytes); |
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263 /* different copying strategy depending on whether |
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264 or not any pointer de-referencing is needed |
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265 */ |
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266 /* strided or in-direct copy */ |
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267 if (view->suboffsets==NULL) { |
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268 _strided_copy_nd(dest, view->buf, view->ndim, view->shape, |
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269 view->strides, view->itemsize, fort); |
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270 } |
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271 else { |
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272 if (_indirect_copy_nd(dest, view, fort) < 0) { |
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273 Py_DECREF(bytes); |
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274 PyObject_ReleaseBuffer(obj, view); |
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275 return NULL; |
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276 } |
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277 } |
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278 if (buffertype == PyBUF_SHADOW) { |
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279 /* return a shadowed memory-view object */ |
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280 view->buf = dest; |
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281 mem->base = PyTuple_Pack(2, obj, bytes); |
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282 Py_DECREF(bytes); |
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283 if (mem->base == NULL) { |
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284 PyObject_ReleaseBuffer(obj, view); |
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285 return NULL; |
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286 } |
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287 } |
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288 else { |
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289 PyObject_ReleaseBuffer(obj, view); |
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290 /* steal the reference */ |
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291 mem->base = bytes; |
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292 } |
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293 return (PyObject *)mem; |
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294 } |
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295 |
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296 |
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297 static PyObject * |
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298 memory_format_get(PyMemoryViewObject *self) |
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299 { |
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300 return PyUnicode_FromString(self->view.format); |
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301 } |
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302 |
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303 static PyObject * |
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304 memory_itemsize_get(PyMemoryViewObject *self) |
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305 { |
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306 return PyLong_FromSsize_t(self->view.itemsize); |
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307 } |
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308 |
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309 static PyObject * |
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310 _IntTupleFromSsizet(int len, Py_ssize_t *vals) |
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311 { |
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312 int i; |
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313 PyObject *o; |
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314 PyObject *intTuple; |
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315 |
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316 if (vals == NULL) { |
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317 Py_INCREF(Py_None); |
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318 return Py_None; |
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319 } |
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320 intTuple = PyTuple_New(len); |
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321 if (!intTuple) return NULL; |
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322 for(i=0; i<len; i++) { |
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323 o = PyLong_FromSsize_t(vals[i]); |
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324 if (!o) { |
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325 Py_DECREF(intTuple); |
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326 return NULL; |
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327 } |
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328 PyTuple_SET_ITEM(intTuple, i, o); |
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329 } |
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330 return intTuple; |
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331 } |
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332 |
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333 static PyObject * |
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334 memory_shape_get(PyMemoryViewObject *self) |
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335 { |
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336 return _IntTupleFromSsizet(self->view.ndim, self->view.shape); |
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337 } |
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338 |
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339 static PyObject * |
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340 memory_strides_get(PyMemoryViewObject *self) |
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341 { |
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342 return _IntTupleFromSsizet(self->view.ndim, self->view.strides); |
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343 } |
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344 |
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345 static PyObject * |
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346 memory_suboffsets_get(PyMemoryViewObject *self) |
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347 { |
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348 return _IntTupleFromSsizet(self->view.ndim, self->view.suboffsets); |
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349 } |
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350 |
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351 static PyObject * |
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352 memory_size_get(PyMemoryViewObject *self) |
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353 { |
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354 return PyLong_FromSsize_t(self->view.len); |
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355 } |
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356 |
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357 static PyObject * |
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358 memory_readonly_get(PyMemoryViewObject *self) |
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359 { |
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360 return PyBool_FromLong(self->view.readonly); |
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361 } |
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362 |
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363 static PyObject * |
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364 memory_ndim_get(PyMemoryViewObject *self) |
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365 { |
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366 return PyLong_FromLong(self->view.ndim); |
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367 } |
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368 |
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369 static PyGetSetDef memory_getsetlist[] ={ |
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370 {"format", (getter)memory_format_get, NULL, NULL}, |
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371 {"itemsize", (getter)memory_itemsize_get, NULL, NULL}, |
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372 {"shape", (getter)memory_shape_get, NULL, NULL}, |
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373 {"strides", (getter)memory_strides_get, NULL, NULL}, |
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374 {"suboffsets", (getter)memory_suboffsets_get, NULL, NULL}, |
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375 {"size", (getter)memory_size_get, NULL, NULL}, |
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376 {"readonly", (getter)memory_readonly_get, NULL, NULL}, |
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377 {"ndim", (getter)memory_ndim_get, NULL, NULL}, |
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378 {NULL, NULL, NULL, NULL}, |
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379 }; |
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380 |
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381 |
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382 static PyObject * |
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383 memory_tobytes(PyMemoryViewObject *mem, PyObject *noargs) |
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384 { |
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385 return PyByteArray_FromObject((PyObject *)mem); |
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386 } |
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387 |
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388 static PyObject * |
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389 memory_tolist(PyMemoryViewObject *mem, PyObject *noargs) |
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390 { |
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391 /* This should construct a (nested) list of unpacked objects |
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392 possibly using the struct module. |
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393 */ |
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394 Py_INCREF(Py_NotImplemented); |
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395 return Py_NotImplemented; |
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396 } |
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397 |
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398 |
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399 |
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400 static PyMethodDef memory_methods[] = { |
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401 {"tobytes", (PyCFunction)memory_tobytes, METH_NOARGS, NULL}, |
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402 {"tolist", (PyCFunction)memory_tolist, METH_NOARGS, NULL}, |
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403 {NULL, NULL} /* sentinel */ |
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404 }; |
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405 |
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406 |
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407 static void |
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408 memory_dealloc(PyMemoryViewObject *self) |
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409 { |
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410 if (self->base != NULL) { |
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411 if (PyTuple_Check(self->base)) { |
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412 /* Special case when first element is generic object |
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413 with buffer interface and the second element is a |
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414 contiguous "shadow" that must be copied back into |
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415 the data areay of the first tuple element before |
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416 releasing the buffer on the first element. |
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417 */ |
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418 |
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419 PyObject_CopyData(PyTuple_GET_ITEM(self->base,0), |
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420 PyTuple_GET_ITEM(self->base,1)); |
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421 |
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422 /* The view member should have readonly == -1 in |
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423 this instance indicating that the memory can |
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424 be "locked" and was locked and will be unlocked |
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425 again after this call. |
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426 */ |
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427 PyObject_ReleaseBuffer(PyTuple_GET_ITEM(self->base,0), |
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428 &(self->view)); |
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429 } |
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430 else { |
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431 PyObject_ReleaseBuffer(self->base, &(self->view)); |
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432 } |
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433 Py_CLEAR(self->base); |
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434 } |
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435 PyObject_DEL(self); |
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436 } |
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437 |
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438 static PyObject * |
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439 memory_repr(PyMemoryViewObject *self) |
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440 { |
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441 return PyUnicode_FromFormat("<memory at %p>", self); |
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442 } |
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443 |
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444 |
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445 static PyObject * |
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446 memory_str(PyMemoryViewObject *self) |
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447 { |
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448 Py_buffer view; |
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449 PyObject *res; |
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450 |
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451 if (PyObject_GetBuffer((PyObject *)self, &view, PyBUF_FULL) < 0) |
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452 return NULL; |
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453 |
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454 res = PyByteArray_FromStringAndSize(NULL, view.len); |
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455 PyBuffer_ToContiguous(PyByteArray_AS_STRING(res), &view, view.len, 'C'); |
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456 PyObject_ReleaseBuffer((PyObject *)self, &view); |
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457 return res; |
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458 } |
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459 |
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460 /* Sequence methods */ |
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461 |
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462 static Py_ssize_t |
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463 memory_length(PyMemoryViewObject *self) |
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464 { |
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465 Py_buffer view; |
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466 |
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467 if (PyObject_GetBuffer((PyObject *)self, &view, PyBUF_FULL) < 0) |
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468 return -1; |
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469 PyObject_ReleaseBuffer((PyObject *)self, &view); |
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470 return view.len; |
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471 } |
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472 |
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473 /* |
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474 mem[obj] returns a bytes object holding the data for one element if |
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475 obj fully indexes the memory view or another memory-view object |
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476 if it does not. |
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477 |
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478 0-d memory-view objects can be referenced using ... or () but |
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479 not with anything else. |
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480 */ |
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481 static PyObject * |
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482 memory_subscript(PyMemoryViewObject *self, PyObject *key) |
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483 { |
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484 Py_buffer *view; |
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485 view = &(self->view); |
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486 |
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487 if (view->ndim == 0) { |
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488 if (key == Py_Ellipsis || |
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489 (PyTuple_Check(key) && PyTuple_GET_SIZE(key)==0)) { |
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490 Py_INCREF(self); |
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491 return (PyObject *)self; |
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492 } |
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493 else { |
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494 PyErr_SetString(PyExc_IndexError, |
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495 "invalid indexing of 0-dim memory"); |
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496 return NULL; |
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497 } |
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498 } |
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499 if (PyIndex_Check(key)) { |
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500 Py_ssize_t result; |
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501 result = PyNumber_AsSsize_t(key, NULL); |
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502 if (result == -1 && PyErr_Occurred()) |
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503 return NULL; |
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504 if (view->ndim == 1) { |
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505 /* Return a bytes object */ |
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506 char *ptr; |
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507 ptr = (char *)view->buf; |
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508 if (result < 0) { |
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509 result += view->shape[0]; |
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510 } |
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511 if ((result < 0) || (result > view->shape[0])) { |
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512 PyErr_SetString(PyExc_IndexError, |
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513 "index out of bounds"); |
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514 return NULL; |
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515 } |
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516 if (view->strides == NULL) |
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517 ptr += view->itemsize * result; |
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518 else |
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519 ptr += view->strides[0] * result; |
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520 if (view->suboffsets != NULL && |
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521 view->suboffsets[0] >= 0) |
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522 { |
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523 ptr = *((char **)ptr) + view->suboffsets[0]; |
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524 } |
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525 return PyByteArray_FromStringAndSize(ptr, view->itemsize); |
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526 } |
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527 else { |
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528 /* Return a new memory-view object */ |
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529 Py_buffer newview; |
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530 memset(&newview, 0, sizeof(newview)); |
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531 /* XXX: This needs to be fixed so it |
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532 actually returns a sub-view |
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533 */ |
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534 return PyMemoryView_FromMemory(&newview); |
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535 } |
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536 } |
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537 |
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538 /* Need to support getting a sliced view */ |
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539 Py_INCREF(Py_NotImplemented); |
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540 return Py_NotImplemented; |
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541 } |
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542 |
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543 |
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544 /* Need to support assigning memory if we can */ |
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545 static int |
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546 memory_ass_sub(PyMemoryViewObject *self, PyObject *key, PyObject *value) |
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547 { |
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548 return 0; |
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549 } |
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550 |
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551 /* As mapping */ |
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552 static PyMappingMethods memory_as_mapping = { |
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553 (lenfunc)memory_length, /*mp_length*/ |
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554 (binaryfunc)memory_subscript, /*mp_subscript*/ |
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555 (objobjargproc)memory_ass_sub, /*mp_ass_subscript*/ |
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556 }; |
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557 |
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558 |
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559 /* Buffer methods */ |
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560 |
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561 static PyBufferProcs memory_as_buffer = { |
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562 (getbufferproc)memory_getbuf, /* bf_getbuffer */ |
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563 (releasebufferproc)memory_releasebuf, /* bf_releasebuffer */ |
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564 }; |
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565 |
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566 |
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567 PyTypeObject PyMemoryView_Type = { |
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568 PyVarObject_HEAD_INIT(&PyType_Type, 0) |
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Travis E. Oliphant <oliphant@enthought.com>
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569 "memoryview", |
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570 sizeof(PyMemoryViewObject), |
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571 0, |
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Travis E. Oliphant <oliphant@enthought.com>
parents:
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572 (destructor)memory_dealloc, /* tp_dealloc */ |
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85c22b4d4455
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Travis E. Oliphant <oliphant@enthought.com>
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573 0, /* tp_print */ |
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574 0, /* tp_getattr */ |
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575 0, /* tp_setattr */ |
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576 0, /* tp_compare */ |
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577 (reprfunc)memory_repr, /* tp_repr */ |
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578 0, /* tp_as_number */ |
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579 0, /* tp_as_sequence */ |
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580 &memory_as_mapping, /* tp_as_mapping */ |
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581 0, /* tp_hash */ |
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582 0, /* tp_call */ |
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583 (reprfunc)memory_str, /* tp_str */ |
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584 PyObject_GenericGetAttr, /* tp_getattro */ |
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585 0, /* tp_setattro */ |
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586 &memory_as_buffer, /* tp_as_buffer */ |
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587 Py_TPFLAGS_DEFAULT, /* tp_flags */ |
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588 memory_doc, /* tp_doc */ |
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589 0, /* tp_traverse */ |
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590 0, /* tp_clear */ |
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591 0, /* tp_richcompare */ |
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592 0, /* tp_weaklistoffset */ |
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593 0, /* tp_iter */ |
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594 0, /* tp_iternext */ |
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43439
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Guido van Rossum <guido@python.org>
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595 memory_methods, /* tp_methods */ |
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42665
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596 0, /* tp_members */ |
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597 memory_getsetlist, /* tp_getset */ |
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598 0, /* tp_base */ |
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599 0, /* tp_dict */ |
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600 0, /* tp_descr_get */ |
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601 0, /* tp_descr_set */ |
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602 0, /* tp_dictoffset */ |
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603 0, /* tp_init */ |
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604 0, /* tp_alloc */ |
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605 memory_new, /* tp_new */ |
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606 }; |
