cpython/Include/pybuffer.h at 3.11 · python/cpython · GitHub

History

142 lines (112 loc) · 5 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

/* Public Py_buffer API */

#ifndef Py_BUFFER_H

#define Py_BUFFER_H

#ifdef __cplusplus

extern "C" {

#endif

#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030b0000

/* === New Buffer API ============================================

* Limited API and stable ABI since Python 3.11

* Py_buffer struct layout and size is now part of the stable abi3. The

* struct layout and size must not be changed in any way, as it would

* break the ABI.

typedef struct {

void *buf;

PyObject *obj; /* owned reference */

Py_ssize_t len;

Py_ssize_t itemsize; /* This is Py_ssize_t so it can be

pointed to by strides in simple case.*/

int readonly;

int ndim;

char *format;

Py_ssize_t *shape;

Py_ssize_t *strides;

Py_ssize_t *suboffsets;

void *internal;

} Py_buffer;

/* Return 1 if the getbuffer function is available, otherwise return 0. */

PyAPI_FUNC(int) PyObject_CheckBuffer(PyObject *obj);

/* This is a C-API version of the getbuffer function call. It checks

to make sure object has the required function pointer and issues the

call.

Returns -1 and raises an error on failure and returns 0 on success. */

PyAPI_FUNC(int) PyObject_GetBuffer(PyObject *obj, Py_buffer *view,

int flags);

/* Get the memory area pointed to by the indices for the buffer given.

Note that view->ndim is the assumed size of indices. */

PyAPI_FUNC(void *) PyBuffer_GetPointer(const Py_buffer *view, const Py_ssize_t *indices);

/* Return the implied itemsize of the data-format area from a

struct-style description. */

PyAPI_FUNC(Py_ssize_t) PyBuffer_SizeFromFormat(const char *format);

/* Implementation in memoryobject.c */

PyAPI_FUNC(int) PyBuffer_ToContiguous(void *buf, const Py_buffer *view,

Py_ssize_t len, char order);

PyAPI_FUNC(int) PyBuffer_FromContiguous(const Py_buffer *view, const void *buf,

Py_ssize_t len, char order);

/* Copy len bytes of data from the contiguous chunk of memory

pointed to by buf into the buffer exported by obj. Return

0 on success and return -1 and raise a PyBuffer_Error on

error (i.e. the object does not have a buffer interface or

it is not working).

If fort is 'F', then if the object is multi-dimensional,

then the data will be copied into the array in

Fortran-style (first dimension varies the fastest). If

fort is 'C', then the data will be copied into the array

in C-style (last dimension varies the fastest). If fort

is 'A', then it does not matter and the copy will be made

in whatever way is more efficient. */

PyAPI_FUNC(int) PyObject_CopyData(PyObject *dest, PyObject *src);

/* Copy the data from the src buffer to the buffer of destination. */

PyAPI_FUNC(int) PyBuffer_IsContiguous(const Py_buffer *view, char fort);

/*Fill the strides array with byte-strides of a contiguous

(Fortran-style if fort is 'F' or C-style otherwise)

array of the given shape with the given number of bytes

per element. */

PyAPI_FUNC(void) PyBuffer_FillContiguousStrides(int ndims,

Py_ssize_t *shape,

Py_ssize_t *strides,

int itemsize,

char fort);

/* Fills in a buffer-info structure correctly for an exporter

that can only share a contiguous chunk of memory of

"unsigned bytes" of the given length.

Returns 0 on success and -1 (with raising an error) on error. */

PyAPI_FUNC(int) PyBuffer_FillInfo(Py_buffer *view, PyObject *o, void *buf,

Py_ssize_t len, int readonly,

int flags);

/* Releases a Py_buffer obtained from getbuffer ParseTuple's "s*". */

PyAPI_FUNC(void) PyBuffer_Release(Py_buffer *view);

/* Maximum number of dimensions */

#define PyBUF_MAX_NDIM 64

/* Flags for getting buffers */

#define PyBUF_SIMPLE 0

#define PyBUF_WRITABLE 0x0001

#ifndef Py_LIMITED_API

/* we used to include an E, backwards compatible alias */

#define PyBUF_WRITEABLE PyBUF_WRITABLE

#endif

#define PyBUF_FORMAT 0x0004

#define PyBUF_ND 0x0008

#define PyBUF_STRIDES (0x0010 | PyBUF_ND)

#define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)

#define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)

#define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)

#define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)

#define PyBUF_CONTIG (PyBUF_ND | PyBUF_WRITABLE)

#define PyBUF_CONTIG_RO (PyBUF_ND)

#define PyBUF_STRIDED (PyBUF_STRIDES | PyBUF_WRITABLE)

#define PyBUF_STRIDED_RO (PyBUF_STRIDES)

#define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_WRITABLE | PyBUF_FORMAT)

#define PyBUF_RECORDS_RO (PyBUF_STRIDES | PyBUF_FORMAT)

#define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_WRITABLE | PyBUF_FORMAT)

#define PyBUF_FULL_RO (PyBUF_INDIRECT | PyBUF_FORMAT)

#define PyBUF_READ 0x100

#define PyBUF_WRITE 0x200

#endif /* !Py_LIMITED_API || Py_LIMITED_API >= 3.11 */

#ifdef __cplusplus

}

#endif

#endif /* Py_BUFFER_H */

cpython/Include/pybuffer.h at 3.11 · python/cpython · GitHub

Uh oh!

Uh oh!

cpython/Include/pybuffer.h at 3.11 · python/cpython · GitHub

Uh oh!

Uh oh!

Expand file tree

Breadcrumbs

pybuffer.h

Latest commit

History

Breadcrumbs

pybuffer.h

File metadata and controls