mirror of
https://github.com/python/cpython
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145 lines
5.2 KiB
C
145 lines
5.2 KiB
C
/* Public Py_buffer API */
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#ifndef Py_BUFFER_H
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#define Py_BUFFER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030b0000
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/* === New Buffer API ============================================
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* Limited API and stable ABI since Python 3.11
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*
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* Py_buffer struct layout and size is now part of the stable abi3. The
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* struct layout and size must not be changed in any way, as it would
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* break the ABI.
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*
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*/
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typedef struct {
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void *buf;
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PyObject *obj; /* owned reference */
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Py_ssize_t len;
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Py_ssize_t itemsize; /* This is Py_ssize_t so it can be
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pointed to by strides in simple case.*/
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int readonly;
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int ndim;
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char *format;
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Py_ssize_t *shape;
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Py_ssize_t *strides;
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Py_ssize_t *suboffsets;
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void *internal;
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} Py_buffer;
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typedef int (*getbufferproc)(PyObject *, Py_buffer *, int);
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typedef void (*releasebufferproc)(PyObject *, Py_buffer *);
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/* Return 1 if the getbuffer function is available, otherwise return 0. */
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PyAPI_FUNC(int) PyObject_CheckBuffer(PyObject *obj);
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/* This is a C-API version of the getbuffer function call. It checks
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to make sure object has the required function pointer and issues the
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call.
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Returns -1 and raises an error on failure and returns 0 on success. */
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PyAPI_FUNC(int) PyObject_GetBuffer(PyObject *obj, Py_buffer *view,
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int flags);
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/* Get the memory area pointed to by the indices for the buffer given.
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Note that view->ndim is the assumed size of indices. */
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PyAPI_FUNC(void *) PyBuffer_GetPointer(const Py_buffer *view, const Py_ssize_t *indices);
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/* Return the implied itemsize of the data-format area from a
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struct-style description. */
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PyAPI_FUNC(Py_ssize_t) PyBuffer_SizeFromFormat(const char *format);
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/* Implementation in memoryobject.c */
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PyAPI_FUNC(int) PyBuffer_ToContiguous(void *buf, const Py_buffer *view,
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Py_ssize_t len, char order);
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PyAPI_FUNC(int) PyBuffer_FromContiguous(const Py_buffer *view, const void *buf,
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Py_ssize_t len, char order);
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/* Copy len bytes of data from the contiguous chunk of memory
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pointed to by buf into the buffer exported by obj. Return
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0 on success and return -1 and raise a PyBuffer_Error on
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error (i.e. the object does not have a buffer interface or
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it is not working).
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If fort is 'F', then if the object is multi-dimensional,
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then the data will be copied into the array in
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Fortran-style (first dimension varies the fastest). If
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fort is 'C', then the data will be copied into the array
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in C-style (last dimension varies the fastest). If fort
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is 'A', then it does not matter and the copy will be made
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in whatever way is more efficient. */
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PyAPI_FUNC(int) PyObject_CopyData(PyObject *dest, PyObject *src);
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/* Copy the data from the src buffer to the buffer of destination. */
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PyAPI_FUNC(int) PyBuffer_IsContiguous(const Py_buffer *view, char fort);
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/*Fill the strides array with byte-strides of a contiguous
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(Fortran-style if fort is 'F' or C-style otherwise)
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array of the given shape with the given number of bytes
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per element. */
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PyAPI_FUNC(void) PyBuffer_FillContiguousStrides(int ndims,
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Py_ssize_t *shape,
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Py_ssize_t *strides,
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int itemsize,
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char fort);
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/* Fills in a buffer-info structure correctly for an exporter
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that can only share a contiguous chunk of memory of
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"unsigned bytes" of the given length.
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Returns 0 on success and -1 (with raising an error) on error. */
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PyAPI_FUNC(int) PyBuffer_FillInfo(Py_buffer *view, PyObject *o, void *buf,
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Py_ssize_t len, int readonly,
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int flags);
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/* Releases a Py_buffer obtained from getbuffer ParseTuple's "s*". */
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PyAPI_FUNC(void) PyBuffer_Release(Py_buffer *view);
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/* Maximum number of dimensions */
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#define PyBUF_MAX_NDIM 64
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/* Flags for getting buffers. Keep these in sync with inspect.BufferFlags. */
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#define PyBUF_SIMPLE 0
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#define PyBUF_WRITABLE 0x0001
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#ifndef Py_LIMITED_API
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/* we used to include an E, backwards compatible alias */
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#define PyBUF_WRITEABLE PyBUF_WRITABLE
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#endif
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#define PyBUF_FORMAT 0x0004
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#define PyBUF_ND 0x0008
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#define PyBUF_STRIDES (0x0010 | PyBUF_ND)
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#define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
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#define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
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#define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
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#define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
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#define PyBUF_CONTIG (PyBUF_ND | PyBUF_WRITABLE)
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#define PyBUF_CONTIG_RO (PyBUF_ND)
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#define PyBUF_STRIDED (PyBUF_STRIDES | PyBUF_WRITABLE)
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#define PyBUF_STRIDED_RO (PyBUF_STRIDES)
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#define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_WRITABLE | PyBUF_FORMAT)
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#define PyBUF_RECORDS_RO (PyBUF_STRIDES | PyBUF_FORMAT)
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#define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_WRITABLE | PyBUF_FORMAT)
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#define PyBUF_FULL_RO (PyBUF_INDIRECT | PyBUF_FORMAT)
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#define PyBUF_READ 0x100
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#define PyBUF_WRITE 0x200
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#endif /* !Py_LIMITED_API || Py_LIMITED_API >= 3.11 */
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#ifdef __cplusplus
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}
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#endif
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#endif /* Py_BUFFER_H */
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