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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,93 @@ | ||
cimport cpython | ||
cimport cpython.buffer | ||
cimport cpython.bytes | ||
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from cpython.buffer cimport ( | ||
PyObject_GetBuffer, | ||
PyBuffer_Release, | ||
PyBuffer_ToContiguous, | ||
) | ||
from cpython.bytes cimport ( | ||
PyBytes_FromStringAndSize, | ||
) | ||
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cimport cython | ||
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cimport pysharedmem | ||
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include "version.pxi" | ||
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cdef extern from "Python.h": | ||
IF PY_VERSION_HEX >= 0x03040000: | ||
void* PyMem_RawMalloc(size_t n) nogil | ||
void PyMem_RawFree(void *p) nogil | ||
ELSE: | ||
void* PyMem_RawMalloc "PyMem_Malloc" (size_t n) nogil | ||
void PyMem_RawFree "PyMem_Free" (void *p) nogil | ||
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cdef class cbuffer: | ||
cdef char[::1] buf | ||
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def __cinit__(self, Py_ssize_t length): | ||
self.buf = None | ||
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if length <= 0: | ||
raise ValueError("length must be positive definite") | ||
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cdef char* ptr = <char*>PyMem_RawMalloc(length * sizeof(char)) | ||
if not ptr: | ||
raise MemoryError("unable to allocate buffer") | ||
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self.buf = <char[:length]>ptr | ||
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def __getbuffer__(self, Py_buffer *buffer, int flags): | ||
buffer.buf = &self.buf[0] | ||
buffer.obj = self | ||
buffer.len = len(self.buf) | ||
buffer.readonly = 0 | ||
buffer.itemsize = self.buf.itemsize | ||
buffer.format = "c" | ||
buffer.ndim = self.buf.ndim | ||
buffer.shape = self.buf.shape | ||
buffer.strides = self.buf.strides | ||
buffer.suboffsets = NULL | ||
buffer.internal = NULL | ||
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def __releasebuffer__(self, Py_buffer *buffer): | ||
pass | ||
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def __reduce__(self): | ||
cdef bytes buf_bytes = PyBytes_FromStringAndSize( | ||
&self.buf[0], len(self.buf) | ||
) | ||
return (frombuffer, (buf_bytes,)) | ||
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@cython.nonecheck(False) | ||
def __dealloc__(self): | ||
cdef char* ptr | ||
if self.buf is not None: | ||
ptr = &self.buf[0] | ||
self.buf = None | ||
PyMem_RawFree(<void*>ptr) | ||
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def frombuffer(object src): | ||
cdef Py_buffer src_buf | ||
cdef cbuffer dest | ||
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PyObject_GetBuffer(src, &src_buf, 0) | ||
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dest = cbuffer(src_buf.len) | ||
PyBuffer_ToContiguous(<void*>&dest.buf[0], &src_buf, src_buf.len, 'C') | ||
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PyBuffer_Release(&src_buf) | ||
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return dest |
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