50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
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#include "common.h"
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#include <windows.h>
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static inline size_t xsize_t(off_t len)
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{
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if (len > (size_t) len)
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die("Cannot handle files this big");
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return (size_t)len;
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}
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void *win32_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
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{
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HANDLE hmap;
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void *temp;
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off_t len;
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struct stat st;
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uint64_t o = offset;
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uint32_t l = o & 0xFFFFFFFF;
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uint32_t h = (o >> 32) & 0xFFFFFFFF;
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if (!fstat(fd, &st))
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len = st.st_size;
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else
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printf("mmap: could not determine filesize");
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if ((length + offset) > len)
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length = xsize_t(len - offset);
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if (!(flags & MAP_PRIVATE))
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printf("Invalid usage of mmap when built with USE_WIN32_MMAP");
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hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY,
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0, 0, 0);
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if (!hmap)
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return MAP_FAILED;
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temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start);
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if (!CloseHandle(hmap))
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printf("unable to close file mapping handle");
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return temp ? temp : MAP_FAILED;
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}
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int win32_munmap(void *start, size_t length)
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{
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return !UnmapViewOfFile(start);
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}
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