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Edit File : pybuffer.h \| Size : 5.16 KB
/* 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; typedef int (getbufferproc)(PyObject , Py_buffer , int); typedef void (releasebufferproc)(PyObject , 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. Keep these in sync with inspect.BufferFlags. / #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 */ Back

Edit File : pybuffer.h | Size : 5.16 KB

/* 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;

typedef int (*getbufferproc)(PyObject *, Py_buffer *, int);
typedef void (*releasebufferproc)(PyObject *, 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. Keep these in sync with inspect.BufferFlags. */
#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 */

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