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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ N T M a p M e m o r y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Mmap() emulates the Unix method of the same name.
%
% The format of the NTMapMemory method is:
%
% MagickPrivate void *NTMapMemory(char *address,size_t length,int protection,
% int access,int file,MagickOffsetType offset)
%
*/
MagickPrivate void *NTMapMemory(char *address,size_t length,int protection,
int flags,int file,MagickOffsetType offset)
{
DWORD
access_mode,
high_length,
high_offset,
low_length,
low_offset,
protection_mode;
HANDLE
file_handle,
map_handle;
void
*map;
(void) address;
access_mode=0;
file_handle=INVALID_HANDLE_VALUE;
low_length=(DWORD) (length & 0xFFFFFFFFUL);
high_length=(DWORD) ((((MagickOffsetType) length) >> 32) & 0xFFFFFFFFUL);
map_handle=INVALID_HANDLE_VALUE;
map=(void *) NULL;
low_offset=(DWORD) (offset & 0xFFFFFFFFUL);
high_offset=(DWORD) ((offset >> 32) & 0xFFFFFFFFUL);
protection_mode=0;
if (protection & PROT_WRITE)
{
access_mode=FILE_MAP_WRITE;
if (!(flags & MAP_PRIVATE))
protection_mode=PAGE_READWRITE;
else
{
access_mode=FILE_MAP_COPY;
protection_mode=PAGE_WRITECOPY;
}
}
else
if (protection & PROT_READ)
{
access_mode=FILE_MAP_READ;
protection_mode=PAGE_READONLY;
}
if ((file == -1) && (flags & MAP_ANONYMOUS))
file_handle=INVALID_HANDLE_VALUE;
else
file_handle=(HANDLE) _get_osfhandle(file);
map_handle=CreateFileMapping(file_handle,0,protection_mode,high_length,
low_length,0);
if (map_handle)
{
map=(void *) MapViewOfFile(map_handle,access_mode,high_offset,low_offset,
length);
CloseHandle(map_handle);
}
if (map == (void *) NULL)
return((void *) ((char *) MAP_FAILED));
return((void *) ((char *) map));
}
Мумуляция «mmap» в «Винде». Это даже работает, если пофиксить две строчки (кто угадает, какие именно, тому ничего).
Отсюда:
https://github.com/ImageMagick/ImageMagick/blob/master/MagickCore/nt-base.c
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