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# Creates a memoryview from a malloced C pointer,
# which will be freed when the python object is garbage collected.
# Code found here is derived from
# http://stackoverflow.com/a/28166272/428751
from cpython.buffer cimport PyBuffer_FillInfo
from libc.stdlib cimport free
# create a python memoryview object from a raw pointer.
cdef memview_fromptr(void *memory, size_t size):
cdef _MemBuf buf = _MemBuf()
buf.memory = memory # malloced void pointer
buf.size = size # size of pointer in bytes
return memoryview(buf)
# private extension type that implements buffer protocol.
cdef class _MemBuf:
cdef void *memory
cdef size_t size
def __getbuffer__(self, Py_buffer *buf, int flags):
PyBuffer_FillInfo(buf, self, <void *>self.memory, self.size, 1, flags)
def __releasebuffer__(self, Py_buffer *buf):
# why doesn't this do anything??
pass
def __dealloc__(self):
free(self.memory)
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