Mercurial > cpython-lru_cache-weakref
annotate Objects/memoryobject.c @ 48715:48dddfd2fbf3
RPC_WSTR is not available Visual Studio 2003 or earlier.
(Maybe I should have defined RPC_WSTR on old compiler,
but uuidcreate() is only place using it, so I simply replaced
with unsigned short *)
| author | Hirokazu Yamamoto <ocean-city@m2.ccsnet.ne.jp> |
|---|---|
| date | Sun, 17 Aug 2008 07:26:26 +0000 |
| parents | cd3b0b7fd8e1 |
| children | 7511f3e672a2 |
| 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 if (self->view.obj) |
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11 Py_INCREF(self->view.obj); |
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12 *view = self->view; |
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13 } |
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14 if (self->view.obj == NULL) |
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15 return 0; |
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16 return self->view.obj->ob_type->tp_as_buffer->bf_getbuffer(self->base, NULL, |
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17 PyBUF_FULL); |
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18 } |
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19 |
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20 static void |
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21 memory_releasebuf(PyMemoryViewObject *self, Py_buffer *view) |
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22 { |
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23 PyBuffer_Release(&self->view); |
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24 } |
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26 PyDoc_STRVAR(memory_doc, |
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27 "memoryview(object)\n\ |
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28 \n\ |
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29 Create a new memoryview object which references the given object."); |
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31 PyObject * |
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32 PyMemoryView_FromMemory(Py_buffer *info) |
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33 { |
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34 PyMemoryViewObject *mview; |
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35 |
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36 mview = (PyMemoryViewObject *)PyObject_New(PyMemoryViewObject, |
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37 &PyMemoryView_Type); |
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38 if (mview == NULL) return NULL; |
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39 mview->base = NULL; |
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40 mview->view = *info; |
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41 if (info->obj) |
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42 Py_INCREF(mview->view.obj); |
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43 return (PyObject *)mview; |
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44 } |
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46 PyObject * |
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47 PyMemoryView_FromObject(PyObject *base) |
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48 { |
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49 PyMemoryViewObject *mview; |
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50 |
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51 if (!PyObject_CheckBuffer(base)) { |
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52 PyErr_SetString(PyExc_TypeError, |
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53 "cannot make memory view because object does " |
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54 "not have the buffer interface"); |
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55 return NULL; |
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56 } |
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57 |
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58 mview = (PyMemoryViewObject *)PyObject_New(PyMemoryViewObject, |
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59 &PyMemoryView_Type); |
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60 if (mview == NULL) return NULL; |
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61 |
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62 mview->base = NULL; |
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63 if (PyObject_GetBuffer(base, &(mview->view), PyBUF_FULL_RO) < 0) { |
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64 Py_DECREF(mview); |
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65 return NULL; |
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66 } |
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67 |
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68 mview->base = base; |
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69 Py_INCREF(base); |
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70 return (PyObject *)mview; |
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71 } |
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72 |
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73 static PyObject * |
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74 memory_new(PyTypeObject *subtype, PyObject *args, PyObject *kwds) |
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75 { |
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76 PyObject *obj; |
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77 static char *kwlist[] = {"object", 0}; |
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78 |
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79 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:memoryview", kwlist, |
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80 &obj)) { |
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81 return NULL; |
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82 } |
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83 |
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84 return PyMemoryView_FromObject(obj); |
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85 } |
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86 |
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87 |
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88 static void |
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89 _strided_copy_nd(char *dest, char *src, int nd, Py_ssize_t *shape, |
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90 Py_ssize_t *strides, Py_ssize_t itemsize, char fort) |
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91 { |
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92 int k; |
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93 Py_ssize_t outstride; |
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94 |
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95 if (nd==0) { |
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96 memcpy(dest, src, itemsize); |
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97 } |
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98 else if (nd == 1) { |
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99 for (k = 0; k<shape[0]; k++) { |
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100 memcpy(dest, src, itemsize); |
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101 dest += itemsize; |
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102 src += strides[0]; |
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103 } |
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104 } |
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105 else { |
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106 if (fort == 'F') { |
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107 /* Copy first dimension first, |
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108 second dimension second, etc... |
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109 Set up the recursive loop backwards so that final |
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110 dimension is actually copied last. |
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111 */ |
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112 outstride = itemsize; |
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113 for (k=1; k<nd-1;k++) { |
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114 outstride *= shape[k]; |
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115 } |
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116 for (k=0; k<shape[nd-1]; k++) { |
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117 _strided_copy_nd(dest, src, nd-1, shape, |
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118 strides, itemsize, fort); |
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119 dest += outstride; |
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120 src += strides[nd-1]; |
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121 } |
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122 } |
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123 |
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124 else { |
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125 /* Copy last dimension first, |
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126 second-to-last dimension second, etc. |
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127 Set up the recursion so that the |
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128 first dimension is copied last |
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129 */ |
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130 outstride = itemsize; |
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131 for (k=1; k < nd; k++) { |
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132 outstride *= shape[k]; |
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133 } |
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134 for (k=0; k<shape[0]; k++) { |
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135 _strided_copy_nd(dest, src, nd-1, shape+1, |
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136 strides+1, itemsize, |
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137 fort); |
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138 dest += outstride; |
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139 src += strides[0]; |
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140 } |
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141 } |
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142 } |
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143 return; |
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144 } |
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145 |
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146 void _add_one_to_index_F(int nd, Py_ssize_t *index, Py_ssize_t *shape); |
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147 void _add_one_to_index_C(int nd, Py_ssize_t *index, Py_ssize_t *shape); |
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148 |
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149 static int |
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150 _indirect_copy_nd(char *dest, Py_buffer *view, char fort) |
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151 { |
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152 Py_ssize_t *indices; |
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153 int k; |
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154 Py_ssize_t elements; |
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155 char *ptr; |
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156 void (*func)(int, Py_ssize_t *, Py_ssize_t *); |
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157 |
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158 if (view->ndim > PY_SSIZE_T_MAX / sizeof(Py_ssize_t)) { |
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159 PyErr_NoMemory(); |
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160 return -1; |
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161 } |
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162 |
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163 indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*view->ndim); |
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164 if (indices == NULL) { |
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165 PyErr_NoMemory(); |
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166 return -1; |
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167 } |
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168 for (k=0; k<view->ndim;k++) { |
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169 indices[k] = 0; |
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170 } |
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171 |
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172 elements = 1; |
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173 for (k=0; k<view->ndim; k++) { |
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174 elements *= view->shape[k]; |
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175 } |
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176 if (fort == 'F') { |
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177 func = _add_one_to_index_F; |
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178 } |
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179 else { |
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180 func = _add_one_to_index_C; |
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181 } |
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182 while (elements--) { |
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183 func(view->ndim, indices, view->shape); |
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184 ptr = PyBuffer_GetPointer(view, indices); |
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185 memcpy(dest, ptr, view->itemsize); |
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186 dest += view->itemsize; |
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187 } |
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188 |
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189 PyMem_Free(indices); |
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190 return 0; |
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191 } |
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192 |
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193 /* |
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194 Get a the data from an object as a contiguous chunk of memory (in |
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195 either 'C' or 'F'ortran order) even if it means copying it into a |
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196 separate memory area. |
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197 |
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198 Returns a new reference to a Memory view object. If no copy is needed, |
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199 the memory view object points to the original memory and holds a |
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200 lock on the original. If a copy is needed, then the memory view object |
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201 points to a brand-new Bytes object (and holds a memory lock on it). |
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202 |
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203 buffertype |
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204 |
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205 PyBUF_READ buffer only needs to be read-only |
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206 PyBUF_WRITE buffer needs to be writable (give error if not contiguous) |
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207 PyBUF_SHADOW buffer needs to be writable so shadow it with |
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208 a contiguous buffer if it is not. The view will point to |
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209 the shadow buffer which can be written to and then |
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210 will be copied back into the other buffer when the memory |
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211 view is de-allocated. While the shadow buffer is |
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212 being used, it will have an exclusive write lock on |
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213 the original buffer. |
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214 */ |
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215 |
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216 PyObject * |
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217 PyMemoryView_GetContiguous(PyObject *obj, int buffertype, char fort) |
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218 { |
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219 PyMemoryViewObject *mem; |
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220 PyObject *bytes; |
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221 Py_buffer *view; |
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222 int flags; |
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223 char *dest; |
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224 |
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225 if (!PyObject_CheckBuffer(obj)) { |
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226 PyErr_SetString(PyExc_TypeError, |
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227 "object does not have the buffer interface"); |
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228 return NULL; |
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229 } |
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230 |
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231 mem = PyObject_New(PyMemoryViewObject, &PyMemoryView_Type); |
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232 if (mem == NULL) return NULL; |
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233 |
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234 view = &PyMemoryView(mem); |
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235 flags = PyBUF_FULL_RO; |
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236 switch(buffertype) { |
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237 case PyBUF_WRITE: |
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238 flags = PyBUF_FULL; |
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239 break; |
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240 } |
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241 |
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242 if (PyObject_GetBuffer(obj, view, flags) != 0) { |
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243 PyObject_DEL(mem); |
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244 return NULL; |
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245 } |
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246 |
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247 if (PyBuffer_IsContiguous(view, fort)) { |
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248 /* no copy needed */ |
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249 Py_INCREF(obj); |
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250 mem->base = obj; |
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251 return (PyObject *)mem; |
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252 } |
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253 /* otherwise a copy is needed */ |
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254 if (buffertype == PyBUF_WRITE) { |
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255 PyObject_DEL(mem); |
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256 PyErr_SetString(PyExc_BufferError, |
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257 "writable contiguous buffer requested " |
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258 "for a non-contiguousobject."); |
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259 return NULL; |
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260 } |
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261 bytes = PyByteArray_FromStringAndSize(NULL, view->len); |
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262 if (bytes == NULL) { |
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263 PyBuffer_Release(view); |
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264 return NULL; |
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265 } |
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266 dest = PyByteArray_AS_STRING(bytes); |
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267 /* different copying strategy depending on whether |
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268 or not any pointer de-referencing is needed |
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269 */ |
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270 /* strided or in-direct copy */ |
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271 if (view->suboffsets==NULL) { |
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272 _strided_copy_nd(dest, view->buf, view->ndim, view->shape, |
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273 view->strides, view->itemsize, fort); |
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274 } |
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275 else { |
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276 if (_indirect_copy_nd(dest, view, fort) < 0) { |
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277 Py_DECREF(bytes); |
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278 PyBuffer_Release(view); |
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279 return NULL; |
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280 } |
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281 } |
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282 if (buffertype == PyBUF_SHADOW) { |
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283 /* return a shadowed memory-view object */ |
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284 view->buf = dest; |
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285 mem->base = PyTuple_Pack(2, obj, bytes); |
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286 Py_DECREF(bytes); |
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287 if (mem->base == NULL) { |
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288 PyBuffer_Release(view); |
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289 return NULL; |
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290 } |
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291 } |
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292 else { |
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293 PyBuffer_Release(view); |
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294 /* steal the reference */ |
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295 mem->base = bytes; |
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296 } |
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297 return (PyObject *)mem; |
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298 } |
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299 |
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300 |
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301 static PyObject * |
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302 memory_format_get(PyMemoryViewObject *self) |
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303 { |
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304 return PyUnicode_FromString(self->view.format); |
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305 } |
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306 |
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307 static PyObject * |
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308 memory_itemsize_get(PyMemoryViewObject *self) |
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309 { |
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310 return PyLong_FromSsize_t(self->view.itemsize); |
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311 } |
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312 |
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313 static PyObject * |
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314 _IntTupleFromSsizet(int len, Py_ssize_t *vals) |
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315 { |
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316 int i; |
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317 PyObject *o; |
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318 PyObject *intTuple; |
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319 |
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320 if (vals == NULL) { |
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321 Py_INCREF(Py_None); |
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322 return Py_None; |
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323 } |
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324 intTuple = PyTuple_New(len); |
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325 if (!intTuple) return NULL; |
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326 for(i=0; i<len; i++) { |
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327 o = PyLong_FromSsize_t(vals[i]); |
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328 if (!o) { |
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329 Py_DECREF(intTuple); |
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330 return NULL; |
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331 } |
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332 PyTuple_SET_ITEM(intTuple, i, o); |
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333 } |
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334 return intTuple; |
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335 } |
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336 |
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337 static PyObject * |
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338 memory_shape_get(PyMemoryViewObject *self) |
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339 { |
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340 return _IntTupleFromSsizet(self->view.ndim, self->view.shape); |
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341 } |
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342 |
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343 static PyObject * |
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344 memory_strides_get(PyMemoryViewObject *self) |
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345 { |
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346 return _IntTupleFromSsizet(self->view.ndim, self->view.strides); |
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347 } |
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348 |
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349 static PyObject * |
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350 memory_suboffsets_get(PyMemoryViewObject *self) |
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351 { |
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352 return _IntTupleFromSsizet(self->view.ndim, self->view.suboffsets); |
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353 } |
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354 |
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355 static PyObject * |
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356 memory_size_get(PyMemoryViewObject *self) |
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357 { |
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358 return PyLong_FromSsize_t(self->view.len); |
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359 } |
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360 |
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361 static PyObject * |
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362 memory_readonly_get(PyMemoryViewObject *self) |
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363 { |
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364 return PyBool_FromLong(self->view.readonly); |
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365 } |
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366 |
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367 static PyObject * |
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368 memory_ndim_get(PyMemoryViewObject *self) |
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369 { |
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370 return PyLong_FromLong(self->view.ndim); |
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371 } |
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372 |
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373 static PyGetSetDef memory_getsetlist[] ={ |
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374 {"format", (getter)memory_format_get, NULL, NULL}, |
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375 {"itemsize", (getter)memory_itemsize_get, NULL, NULL}, |
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376 {"shape", (getter)memory_shape_get, NULL, NULL}, |
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377 {"strides", (getter)memory_strides_get, NULL, NULL}, |
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378 {"suboffsets", (getter)memory_suboffsets_get, NULL, NULL}, |
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379 {"size", (getter)memory_size_get, NULL, NULL}, |
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380 {"readonly", (getter)memory_readonly_get, NULL, NULL}, |
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381 {"ndim", (getter)memory_ndim_get, NULL, NULL}, |
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382 {NULL, NULL, NULL, NULL}, |
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383 }; |
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384 |
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385 |
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386 static PyObject * |
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387 memory_tobytes(PyMemoryViewObject *mem, PyObject *noargs) |
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388 { |
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389 return PyByteArray_FromObject((PyObject *)mem); |
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390 } |
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391 |
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392 static PyObject * |
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393 memory_tolist(PyMemoryViewObject *mem, PyObject *noargs) |
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394 { |
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395 /* This should construct a (nested) list of unpacked objects |
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396 possibly using the struct module. |
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397 */ |
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398 Py_INCREF(Py_NotImplemented); |
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399 return Py_NotImplemented; |
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400 } |
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401 |
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402 |
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403 |
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404 static PyMethodDef memory_methods[] = { |
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405 {"tobytes", (PyCFunction)memory_tobytes, METH_NOARGS, NULL}, |
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406 {"tolist", (PyCFunction)memory_tolist, METH_NOARGS, NULL}, |
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407 {NULL, NULL} /* sentinel */ |
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408 }; |
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409 |
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410 |
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411 static void |
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412 memory_dealloc(PyMemoryViewObject *self) |
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413 { |
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414 if (self->view.obj != NULL) { |
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415 if (PyTuple_Check(self->base)) { |
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416 /* Special case when first element is generic object |
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417 with buffer interface and the second element is a |
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418 contiguous "shadow" that must be copied back into |
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419 the data areay of the first tuple element before |
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420 releasing the buffer on the first element. |
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421 */ |
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422 |
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423 PyObject_CopyData(PyTuple_GET_ITEM(self->base,0), |
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424 PyTuple_GET_ITEM(self->base,1)); |
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425 |
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426 /* The view member should have readonly == -1 in |
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427 this instance indicating that the memory can |
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428 be "locked" and was locked and will be unlocked |
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429 again after this call. |
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430 */ |
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431 PyBuffer_Release(&(self->view)); |
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432 } |
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433 else { |
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434 PyBuffer_Release(&(self->view)); |
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435 } |
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436 Py_CLEAR(self->base); |
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437 } |
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438 PyObject_DEL(self); |
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439 } |
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440 |
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441 static PyObject * |
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442 memory_repr(PyMemoryViewObject *self) |
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443 { |
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444 return PyUnicode_FromFormat("<memory at %p>", self); |
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445 } |
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446 |
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447 |
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448 static PyObject * |
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449 memory_str(PyMemoryViewObject *self) |
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450 { |
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451 Py_buffer view; |
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452 PyObject *res; |
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453 |
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454 if (PyObject_GetBuffer((PyObject *)self, &view, PyBUF_FULL) < 0) |
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455 return NULL; |
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456 |
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457 res = PyByteArray_FromStringAndSize(NULL, view.len); |
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458 PyBuffer_ToContiguous(PyByteArray_AS_STRING(res), &view, view.len, 'C'); |
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459 PyBuffer_Release(&view); |
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460 return res; |
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461 } |
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462 |
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463 /* Sequence methods */ |
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464 |
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465 static Py_ssize_t |
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466 memory_length(PyMemoryViewObject *self) |
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467 { |
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468 Py_buffer view; |
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469 |
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470 if (PyObject_GetBuffer((PyObject *)self, &view, PyBUF_FULL) < 0) |
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471 return -1; |
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472 PyBuffer_Release(&view); |
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473 return view.len; |
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474 } |
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475 |
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476 /* |
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477 mem[obj] returns a bytes object holding the data for one element if |
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478 obj fully indexes the memory view or another memory-view object |
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479 if it does not. |
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480 |
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481 0-d memory-view objects can be referenced using ... or () but |
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482 not with anything else. |
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483 */ |
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484 static PyObject * |
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485 memory_subscript(PyMemoryViewObject *self, PyObject *key) |
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486 { |
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487 Py_buffer *view; |
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488 view = &(self->view); |
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489 |
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490 if (view->ndim == 0) { |
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491 if (key == Py_Ellipsis || |
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492 (PyTuple_Check(key) && PyTuple_GET_SIZE(key)==0)) { |
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493 Py_INCREF(self); |
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494 return (PyObject *)self; |
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495 } |
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496 else { |
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497 PyErr_SetString(PyExc_IndexError, |
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498 "invalid indexing of 0-dim memory"); |
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499 return NULL; |
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500 } |
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501 } |
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502 if (PyIndex_Check(key)) { |
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503 Py_ssize_t result; |
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504 result = PyNumber_AsSsize_t(key, NULL); |
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505 if (result == -1 && PyErr_Occurred()) |
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506 return NULL; |
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507 if (view->ndim == 1) { |
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508 /* Return a bytes object */ |
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509 char *ptr; |
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510 ptr = (char *)view->buf; |
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511 if (result < 0) { |
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512 result += view->shape[0]; |
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513 } |
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514 if ((result < 0) || (result > view->shape[0])) { |
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515 PyErr_SetString(PyExc_IndexError, |
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516 "index out of bounds"); |
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517 return NULL; |
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518 } |
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519 if (view->strides == NULL) |
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520 ptr += view->itemsize * result; |
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521 else |
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522 ptr += view->strides[0] * result; |
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523 if (view->suboffsets != NULL && |
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524 view->suboffsets[0] >= 0) |
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525 { |
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526 ptr = *((char **)ptr) + view->suboffsets[0]; |
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527 } |
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528 return PyByteArray_FromStringAndSize(ptr, view->itemsize); |
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529 } |
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530 else { |
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531 /* Return a new memory-view object */ |
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532 Py_buffer newview; |
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533 memset(&newview, 0, sizeof(newview)); |
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534 /* XXX: This needs to be fixed so it |
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535 actually returns a sub-view |
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536 */ |
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537 return PyMemoryView_FromMemory(&newview); |
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538 } |
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539 } |
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540 |
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541 /* Need to support getting a sliced view */ |
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542 Py_INCREF(Py_NotImplemented); |
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543 return Py_NotImplemented; |
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544 } |
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545 |
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546 |
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547 /* Need to support assigning memory if we can */ |
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548 static int |
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549 memory_ass_sub(PyMemoryViewObject *self, PyObject *key, PyObject *value) |
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550 { |
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551 return 0; |
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552 } |
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553 |
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554 /* As mapping */ |
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555 static PyMappingMethods memory_as_mapping = { |
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556 (lenfunc)memory_length, /*mp_length*/ |
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557 (binaryfunc)memory_subscript, /*mp_subscript*/ |
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558 (objobjargproc)memory_ass_sub, /*mp_ass_subscript*/ |
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559 }; |
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560 |
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561 |
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562 /* Buffer methods */ |
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563 |
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564 static PyBufferProcs memory_as_buffer = { |
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565 (getbufferproc)memory_getbuf, /* bf_getbuffer */ |
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566 (releasebufferproc)memory_releasebuf, /* bf_releasebuffer */ |
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567 }; |
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568 |
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569 |
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570 PyTypeObject PyMemoryView_Type = { |
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571 PyVarObject_HEAD_INIT(&PyType_Type, 0) |
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572 "memoryview", |
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573 sizeof(PyMemoryViewObject), |
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574 0, |
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575 (destructor)memory_dealloc, /* tp_dealloc */ |
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576 0, /* tp_print */ |
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577 0, /* tp_getattr */ |
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578 0, /* tp_setattr */ |
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579 0, /* tp_compare */ |
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580 (reprfunc)memory_repr, /* tp_repr */ |
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581 0, /* tp_as_number */ |
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582 0, /* tp_as_sequence */ |
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583 &memory_as_mapping, /* tp_as_mapping */ |
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584 0, /* tp_hash */ |
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585 0, /* tp_call */ |
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586 (reprfunc)memory_str, /* tp_str */ |
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587 PyObject_GenericGetAttr, /* tp_getattro */ |
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588 0, /* tp_setattro */ |
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589 &memory_as_buffer, /* tp_as_buffer */ |
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590 Py_TPFLAGS_DEFAULT, /* tp_flags */ |
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591 memory_doc, /* tp_doc */ |
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592 0, /* tp_traverse */ |
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593 0, /* tp_clear */ |
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594 0, /* tp_richcompare */ |
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595 0, /* tp_weaklistoffset */ |
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596 0, /* tp_iter */ |
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597 0, /* tp_iternext */ |
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Guido van Rossum <guido@python.org>
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598 memory_methods, /* tp_methods */ |
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42665
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599 0, /* tp_members */ |
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600 memory_getsetlist, /* tp_getset */ |
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601 0, /* tp_base */ |
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602 0, /* tp_dict */ |
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603 0, /* tp_descr_get */ |
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604 0, /* tp_descr_set */ |
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605 0, /* tp_dictoffset */ |
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606 0, /* tp_init */ |
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607 0, /* tp_alloc */ |
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608 memory_new, /* tp_new */ |
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609 }; |
