Mercurial > cpython-lru_cache-weakref

annotate Doc/c-api/buffer.rst @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 85aa706f7126
children 38e9b9da0164
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1 .. highlightlang:: c
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2
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3 .. _bufferobjects:
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5 Buffer Objects
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6 --------------
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7
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8 .. sectionauthor:: Greg Stein <gstein@lyra.org>
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11 .. index::
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12 object: buffer
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13 single: buffer interface
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14
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15 Python objects implemented in C can export a group of functions called the
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16 "buffer interface." These functions can be used by an object to expose its
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17 data in a raw, byte-oriented format. Clients of the object can use the buffer
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18 interface to access the object data directly, without needing to copy it
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19 first.
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21 Two examples of objects that support the buffer interface are strings and
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22 arrays. The string object exposes the character contents in the buffer
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23 interface's byte-oriented form. An array can also expose its contents, but it
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24 should be noted that array elements may be multi-byte values.
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25
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26 An example user of the buffer interface is the file object's :meth:`write`
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27 method. Any object that can export a series of bytes through the buffer
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28 interface can be written to a file. There are a number of format codes to
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29 :cfunc:`PyArg_ParseTuple` that operate against an object's buffer interface,
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30 returning data from the target object.
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31
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32 Starting from version 1.6, Python has been providing Python-level buffer
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33 objects and a C-level buffer API so that any built-in or used-defined type can
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34 expose its characteristics. Both, however, have been deprecated because of
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35 various shortcomings, and have been officially removed in Python 3.0 in favour
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36 of a new C-level buffer API and a new Python-level object named
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37 :class:`memoryview`.
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39 The new buffer API has been backported to Python 2.6, and the
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40 :class:`memoryview` object has been backported to Python 2.7. It is strongly
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41 advised to use them rather than the old APIs, unless you are blocked from
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42 doing so for compatibility reasons.
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45 The new-style Py_buffer struct
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46 ==============================
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49 .. ctype:: Py_buffer
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51 .. cmember:: void *buf
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53 A pointer to the start of the memory for the object.
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55 .. cmember:: Py_ssize_t len
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56 :noindex:
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58 The total length of the memory in bytes.
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60 .. cmember:: int readonly
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62 An indicator of whether the buffer is read only.
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64 .. cmember:: const char *format
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65 :noindex:
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67 A *NULL* terminated string in :mod:`struct` module style syntax giving
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68 the contents of the elements available through the buffer. If this is
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69 *NULL*, ``"B"`` (unsigned bytes) is assumed.
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71 .. cmember:: int ndim
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73 The number of dimensions the memory represents as a multi-dimensional
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74 array. If it is 0, :cdata:`strides` and :cdata:`suboffsets` must be
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75 *NULL*.
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77 .. cmember:: Py_ssize_t *shape
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79 An array of :ctype:`Py_ssize_t`\s the length of :cdata:`ndim` giving the
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80 shape of the memory as a multi-dimensional array. Note that
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81 ``((*shape)[0] * ... * (*shape)[ndims-1])*itemsize`` should be equal to
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82 :cdata:`len`.
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84 .. cmember:: Py_ssize_t *strides
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85
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86 An array of :ctype:`Py_ssize_t`\s the length of :cdata:`ndim` giving the
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87 number of bytes to skip to get to a new element in each dimension.
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88
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89 .. cmember:: Py_ssize_t *suboffsets
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90
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91 An array of :ctype:`Py_ssize_t`\s the length of :cdata:`ndim`. If these
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92 suboffset numbers are greater than or equal to 0, then the value stored
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93 along the indicated dimension is a pointer and the suboffset value
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94 dictates how many bytes to add to the pointer after de-referencing. A
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95 suboffset value that it negative indicates that no de-referencing should
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96 occur (striding in a contiguous memory block).
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97
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98 Here is a function that returns a pointer to the element in an N-D array
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99 pointed to by an N-dimesional index when there are both non-NULL strides
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100 and suboffsets::
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101
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102 void *get_item_pointer(int ndim, void *buf, Py_ssize_t *strides,
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103 Py_ssize_t *suboffsets, Py_ssize_t *indices) {
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104 char *pointer = (char*)buf;
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105 int i;
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106 for (i = 0; i < ndim; i++) {
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107 pointer += strides[i] * indices[i];
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108 if (suboffsets[i] >=0 ) {
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109 pointer = *((char**)pointer) + suboffsets[i];
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110 }
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111 }
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112 return (void*)pointer;
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113 }
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114
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115
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116 .. cmember:: Py_ssize_t itemsize
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117
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118 This is a storage for the itemsize (in bytes) of each element of the
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119 shared memory. It is technically un-necessary as it can be obtained
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120 using :cfunc:`PyBuffer_SizeFromFormat`, however an exporter may know
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121 this information without parsing the format string and it is necessary
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122 to know the itemsize for proper interpretation of striding. Therefore,
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123 storing it is more convenient and faster.
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124
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125 .. cmember:: void *internal
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126
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127 This is for use internally by the exporting object. For example, this
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128 might be re-cast as an integer by the exporter and used to store flags
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129 about whether or not the shape, strides, and suboffsets arrays must be
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130 freed when the buffer is released. The consumer should never alter this
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131 value.
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132
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133
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134 Buffer related functions
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135 ========================
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136
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137
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138 .. cfunction:: int PyObject_CheckBuffer(PyObject *obj)
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139
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140 Return 1 if *obj* supports the buffer interface otherwise 0.
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141
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142
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143 .. cfunction:: int PyObject_GetBuffer(PyObject *obj, Py_buffer *view, int flags)
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144
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145 Export *obj* into a :ctype:`Py_buffer`, *view*. These arguments must
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146 never be *NULL*. The *flags* argument is a bit field indicating what
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147 kind of buffer the caller is prepared to deal with and therefore what
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148 kind of buffer the exporter is allowed to return. The buffer interface
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149 allows for complicated memory sharing possibilities, but some caller may
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150 not be able to handle all the complexity but may want to see if the
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151 exporter will let them take a simpler view to its memory.
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152
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153 Some exporters may not be able to share memory in every possible way and
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154 may need to raise errors to signal to some consumers that something is
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155 just not possible. These errors should be a :exc:`BufferError` unless
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156 there is another error that is actually causing the problem. The
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157 exporter can use flags information to simplify how much of the
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158 :cdata:`Py_buffer` structure is filled in with non-default values and/or
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159 raise an error if the object can't support a simpler view of its memory.
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160
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161 0 is returned on success and -1 on error.
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162
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163 The following table gives possible values to the *flags* arguments.
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164
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165 +------------------------------+---------------------------------------------------+
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166 | Flag | Description |
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167 +==============================+===================================================+
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168 | :cmacro:`PyBUF_SIMPLE` | This is the default flag state. The returned |
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169 | | buffer may or may not have writable memory. The |
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170 | | format of the data will be assumed to be unsigned |
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171 | | bytes. This is a "stand-alone" flag constant. It |
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172 | | never needs to be '|'d to the others. The exporter|
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173 | | will raise an error if it cannot provide such a |
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174 | | contiguous buffer of bytes. |
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175 | | |
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176 +------------------------------+---------------------------------------------------+
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177 | :cmacro:`PyBUF_WRITABLE` | The returned buffer must be writable. If it is |
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178 | | not writable, then raise an error. |
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179 +------------------------------+---------------------------------------------------+
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180 | :cmacro:`PyBUF_STRIDES` | This implies :cmacro:`PyBUF_ND`. The returned |
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181 | | buffer must provide strides information (i.e. the |
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182 | | strides cannot be NULL). This would be used when |
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183 | | the consumer can handle strided, discontiguous |
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184 | | arrays. Handling strides automatically assumes |
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185 | | you can handle shape. The exporter can raise an |
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186 | | error if a strided representation of the data is |
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187 | | not possible (i.e. without the suboffsets). |
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188 | | |
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189 +------------------------------+---------------------------------------------------+
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190 | :cmacro:`PyBUF_ND` | The returned buffer must provide shape |
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191 | | information. The memory will be assumed C-style |
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192 | | contiguous (last dimension varies the |
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193 | | fastest). The exporter may raise an error if it |
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194 | | cannot provide this kind of contiguous buffer. If |
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195 | | this is not given then shape will be *NULL*. |
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196 | | |
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197 | | |
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198 | | |
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199 +------------------------------+---------------------------------------------------+
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200 |:cmacro:`PyBUF_C_CONTIGUOUS` | These flags indicate that the contiguity returned |
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201 |:cmacro:`PyBUF_F_CONTIGUOUS` | buffer must be respectively, C-contiguous (last |
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202 |:cmacro:`PyBUF_ANY_CONTIGUOUS`| dimension varies the fastest), Fortran contiguous |
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203 | | (first dimension varies the fastest) or either |
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204 | | one. All of these flags imply |
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205 | | :cmacro:`PyBUF_STRIDES` and guarantee that the |
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206 | | strides buffer info structure will be filled in |
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207 | | correctly. |
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208 | | |
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209 +------------------------------+---------------------------------------------------+
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210 | :cmacro:`PyBUF_INDIRECT` | This flag indicates the returned buffer must have |
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211 | | suboffsets information (which can be NULL if no |
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212 | | suboffsets are needed). This can be used when |
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213 | | the consumer can handle indirect array |
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214 | | referencing implied by these suboffsets. This |
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215 | | implies :cmacro:`PyBUF_STRIDES`. |
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216 | | |
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217 | | |
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218 | | |
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219 +------------------------------+---------------------------------------------------+
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220 | :cmacro:`PyBUF_FORMAT` | The returned buffer must have true format |
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221 | | information if this flag is provided. This would |
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222 | | be used when the consumer is going to be checking |
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223 | | for what 'kind' of data is actually stored. An |
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224 | | exporter should always be able to provide this |
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225 | | information if requested. If format is not |
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226 | | explicitly requested then the format must be |
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227 | | returned as *NULL* (which means ``'B'``, or |
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228 | | unsigned bytes) |
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229 +------------------------------+---------------------------------------------------+
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230 | :cmacro:`PyBUF_STRIDED` | This is equivalent to ``(PyBUF_STRIDES | |
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231 | | PyBUF_WRITABLE)``. |
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232 +------------------------------+---------------------------------------------------+
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233 | :cmacro:`PyBUF_STRIDED_RO` | This is equivalent to ``(PyBUF_STRIDES)``. |
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234 | | |
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235 +------------------------------+---------------------------------------------------+
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236 | :cmacro:`PyBUF_RECORDS` | This is equivalent to ``(PyBUF_STRIDES | |
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237 | | PyBUF_FORMAT | PyBUF_WRITABLE)``. |
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238 +------------------------------+---------------------------------------------------+
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239 | :cmacro:`PyBUF_RECORDS_RO` | This is equivalent to ``(PyBUF_STRIDES | |
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240 | | PyBUF_FORMAT)``. |
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241 +------------------------------+---------------------------------------------------+
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242 | :cmacro:`PyBUF_FULL` | This is equivalent to ``(PyBUF_INDIRECT | |
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243 | | PyBUF_FORMAT | PyBUF_WRITABLE)``. |
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244 +------------------------------+---------------------------------------------------+
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245 | :cmacro:`PyBUF_FULL_RO` | This is equivalent to ``(PyBUF_INDIRECT | |
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246 | | PyBUF_FORMAT)``. |
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247 +------------------------------+---------------------------------------------------+
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248 | :cmacro:`PyBUF_CONTIG` | This is equivalent to ``(PyBUF_ND | |
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249 | | PyBUF_WRITABLE)``. |
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250 +------------------------------+---------------------------------------------------+
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251 | :cmacro:`PyBUF_CONTIG_RO` | This is equivalent to ``(PyBUF_ND)``. |
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252 | | |
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253 +------------------------------+---------------------------------------------------+
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254
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255
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256 .. cfunction:: void PyBuffer_Release(Py_buffer *view)
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257
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258 Release the buffer *view*. This should be called when the buffer
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259 is no longer being used as it may free memory from it.
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260
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261
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262 .. cfunction:: Py_ssize_t PyBuffer_SizeFromFormat(const char *)
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263
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264 Return the implied :cdata:`~Py_buffer.itemsize` from the struct-stype
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265 :cdata:`~Py_buffer.format`.
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266
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267
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268 .. cfunction:: int PyObject_CopyToObject(PyObject *obj, void *buf, Py_ssize_t len, char fortran)
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269
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270 Copy *len* bytes of data pointed to by the contiguous chunk of memory
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271 pointed to by *buf* into the buffer exported by obj. The buffer must of
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272 course be writable. Return 0 on success and return -1 and raise an error
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273 on failure. If the object does not have a writable buffer, then an error
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274 is raised. If *fortran* is ``'F'``, then if the object is
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275 multi-dimensional, then the data will be copied into the array in
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276 Fortran-style (first dimension varies the fastest). If *fortran* is
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277 ``'C'``, then the data will be copied into the array in C-style (last
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278 dimension varies the fastest). If *fortran* is ``'A'``, then it does not
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279 matter and the copy will be made in whatever way is more efficient.
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282 .. cfunction:: int PyBuffer_IsContiguous(Py_buffer *view, char fortran)
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283
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284 Return 1 if the memory defined by the *view* is C-style (*fortran* is
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285 ``'C'``) or Fortran-style (*fortran* is ``'F'``) contiguous or either one
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286 (*fortran* is ``'A'``). Return 0 otherwise.
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288
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289 .. cfunction:: void PyBuffer_FillContiguousStrides(int ndim, Py_ssize_t *shape, Py_ssize_t *strides, Py_ssize_t itemsize, char fortran)
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290
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291 Fill the *strides* array with byte-strides of a contiguous (C-style if
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292 *fortran* is ``'C'`` or Fortran-style if *fortran* is ``'F'`` array of the
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293 given shape with the given number of bytes per element.
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294
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296 .. cfunction:: int PyBuffer_FillInfo(Py_buffer *view, void *buf, Py_ssize_t len, int readonly, int infoflags)
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297
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298 Fill in a buffer-info structure, *view*, correctly for an exporter that can
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299 only share a contiguous chunk of memory of "unsigned bytes" of the given
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300 length. Return 0 on success and -1 (with raising an error) on error.
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301
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303 Old-style buffer objects
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304 ========================
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305
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306 .. index:: single: PyBufferProcs
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307
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308 More information on the buffer interface is provided in the section
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309 :ref:`buffer-structs`, under the description for :ctype:`PyBufferProcs`.
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310
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311 A "buffer object" is defined in the :file:`bufferobject.h` header (included by
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312 :file:`Python.h`). These objects look very similar to string objects at the
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313 Python programming level: they support slicing, indexing, concatenation, and
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314 some other standard string operations. However, their data can come from one
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315 of two sources: from a block of memory, or from another object which exports
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316 the buffer interface.
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317
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318 Buffer objects are useful as a way to expose the data from another object's
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319 buffer interface to the Python programmer. They can also be used as a
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320 zero-copy slicing mechanism. Using their ability to reference a block of
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321 memory, it is possible to expose any data to the Python programmer quite
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322 easily. The memory could be a large, constant array in a C extension, it could
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323 be a raw block of memory for manipulation before passing to an operating
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324 system library, or it could be used to pass around structured data in its
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325 native, in-memory format.
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327
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328 .. ctype:: PyBufferObject
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329
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330 This subtype of :ctype:`PyObject` represents a buffer object.
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331
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332
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333 .. cvar:: PyTypeObject PyBuffer_Type
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334
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335 .. index:: single: BufferType (in module types)
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336
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337 The instance of :ctype:`PyTypeObject` which represents the Python buffer type;
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338 it is the same object as ``buffer`` and ``types.BufferType`` in the Python
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339 layer. .
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340
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341
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342 .. cvar:: int Py_END_OF_BUFFER
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343
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344 This constant may be passed as the *size* parameter to
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345 :cfunc:`PyBuffer_FromObject` or :cfunc:`PyBuffer_FromReadWriteObject`. It
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346 indicates that the new :ctype:`PyBufferObject` should refer to *base*
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347 object from the specified *offset* to the end of its exported buffer.
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348 Using this enables the caller to avoid querying the *base* object for its
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349 length.
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351
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352 .. cfunction:: int PyBuffer_Check(PyObject *p)
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353
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354 Return true if the argument has type :cdata:`PyBuffer_Type`.
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355
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357 .. cfunction:: PyObject* PyBuffer_FromObject(PyObject *base, Py_ssize_t offset, Py_ssize_t size)
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358
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359 Return a new read-only buffer object. This raises :exc:`TypeError` if
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360 *base* doesn't support the read-only buffer protocol or doesn't provide
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361 exactly one buffer segment, or it raises :exc:`ValueError` if *offset* is
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362 less than zero. The buffer will hold a reference to the *base* object, and
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363 the buffer's contents will refer to the *base* object's buffer interface,
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364 starting as position *offset* and extending for *size* bytes. If *size* is
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365 :const:`Py_END_OF_BUFFER`, then the new buffer's contents extend to the
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366 length of the *base* object's exported buffer data.
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367
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368 .. versionchanged:: 2.5
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369 This function used an :ctype:`int` type for *offset* and *size*. This
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370 might require changes in your code for properly supporting 64-bit
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371 systems.
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372
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373
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374 .. cfunction:: PyObject* PyBuffer_FromReadWriteObject(PyObject *base, Py_ssize_t offset, Py_ssize_t size)
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375
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376 Return a new writable buffer object. Parameters and exceptions are similar
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377 to those for :cfunc:`PyBuffer_FromObject`. If the *base* object does not
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378 export the writeable buffer protocol, then :exc:`TypeError` is raised.
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379
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380 .. versionchanged:: 2.5
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381 This function used an :ctype:`int` type for *offset* and *size*. This
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382 might require changes in your code for properly supporting 64-bit
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383 systems.
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384
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386 .. cfunction:: PyObject* PyBuffer_FromMemory(void *ptr, Py_ssize_t size)
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387
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388 Return a new read-only buffer object that reads from a specified location
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389 in memory, with a specified size. The caller is responsible for ensuring
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390 that the memory buffer, passed in as *ptr*, is not deallocated while the
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391 returned buffer object exists. Raises :exc:`ValueError` if *size* is less
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392 than zero. Note that :const:`Py_END_OF_BUFFER` may *not* be passed for the
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393 *size* parameter; :exc:`ValueError` will be raised in that case.
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394
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395 .. versionchanged:: 2.5
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396 This function used an :ctype:`int` type for *size*. This might require
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397 changes in your code for properly supporting 64-bit systems.
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398
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399
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400 .. cfunction:: PyObject* PyBuffer_FromReadWriteMemory(void *ptr, Py_ssize_t size)
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401
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402 Similar to :cfunc:`PyBuffer_FromMemory`, but the returned buffer is
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403 writable.
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404
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405 .. versionchanged:: 2.5
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406 This function used an :ctype:`int` type for *size*. This might require
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407 changes in your code for properly supporting 64-bit systems.
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408
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409
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410 .. cfunction:: PyObject* PyBuffer_New(Py_ssize_t size)
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411
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412 Return a new writable buffer object that maintains its own memory buffer of
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413 *size* bytes. :exc:`ValueError` is returned if *size* is not zero or
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414 positive. Note that the memory buffer (as returned by
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415 :cfunc:`PyObject_AsWriteBuffer`) is not specifically aligned.
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416
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417 .. versionchanged:: 2.5
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418 This function used an :ctype:`int` type for *size*. This might require
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419 changes in your code for properly supporting 64-bit systems.