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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,81 @@ | ||
cimport libc | ||
cimport libc.string | ||
from libc.string cimport memcpy | ||
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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.ndim | ||
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): | ||
return (__cbuffer_reduce_helper, (bytearray(memoryview(self)),)) | ||
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@staticmethod | ||
def frombuffer(object buf): | ||
cdef char[:] buf_view = buf | ||
cdef Py_ssize_t buf_len = len(buf_view) | ||
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cdef cbuffer other = cbuffer(buf_len) | ||
memcpy(&other.buf[0], &buf_view[0], buf_len) | ||
return other | ||
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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 __cbuffer_reduce_helper(object buf): | ||
return cbuffer.frombuffer(buf) |
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