1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
# Legacy Python 2 buffer interface.
#
# These functions are no longer available in Python 3, use the new
# buffer interface instead.
cdef extern from "Python.h":
cdef enum _:
Py_END_OF_BUFFER
# This constant may be passed as the size parameter to
# PyBuffer_FromObject() or PyBuffer_FromReadWriteObject(). It
# indicates that the new PyBufferObject should refer to base object
# from the specified offset to the end of its exported
# buffer. Using this enables the caller to avoid querying the base
# object for its length.
bint PyBuffer_Check(object p)
# Return true if the argument has type PyBuffer_Type.
object PyBuffer_FromObject(object base, Py_ssize_t offset, Py_ssize_t size)
# Return value: New reference.
#
# Return a new read-only buffer object. This raises TypeError if
# base doesn't support the read-only buffer protocol or doesn't
# provide exactly one buffer segment, or it raises ValueError if
# offset is less than zero. The buffer will hold a reference to the
# base object, and the buffer's contents will refer to the base
# object's buffer interface, starting as position offset and
# extending for size bytes. If size is Py_END_OF_BUFFER, then the
# new buffer's contents extend to the length of the base object's
# exported buffer data.
object PyBuffer_FromReadWriteObject(object base, Py_ssize_t offset, Py_ssize_t size)
# Return value: New reference.
#
# Return a new writable buffer object. Parameters and exceptions
# are similar to those for PyBuffer_FromObject(). If the base
# object does not export the writeable buffer protocol, then
# TypeError is raised.
object PyBuffer_FromMemory(void *ptr, Py_ssize_t size)
# Return value: New reference.
#
# Return a new read-only buffer object that reads from a specified
# location in memory, with a specified size. The caller is
# responsible for ensuring that the memory buffer, passed in as
# ptr, is not deallocated while the returned buffer object
# exists. Raises ValueError if size is less than zero. Note that
# Py_END_OF_BUFFER may not be passed for the size parameter;
# ValueError will be raised in that case.
object PyBuffer_FromReadWriteMemory(void *ptr, Py_ssize_t size)
# Return value: New reference.
#
# Similar to PyBuffer_FromMemory(), but the returned buffer is
# writable.
object PyBuffer_New(Py_ssize_t size)
# Return value: New reference.
#
# Return a new writable buffer object that maintains its own memory
# buffer of size bytes. ValueError is returned if size is not zero
# or positive. Note that the memory buffer (as returned by
# PyObject_AsWriteBuffer()) is not specifically aligned.
|
