46 lines
1.1 KiB
46 lines
1.1 KiB
#include "../git-compat-util.h" |
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void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
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{ |
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HANDLE osfhandle, hmap; |
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void *temp; |
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LARGE_INTEGER len; |
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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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osfhandle = (HANDLE)_get_osfhandle(fd); |
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if (!GetFileSizeEx(osfhandle, &len)) |
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die("mmap: could not determine filesize"); |
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if ((length + offset) > len.QuadPart) |
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length = xsize_t(len.QuadPart - offset); |
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if (!(flags & MAP_PRIVATE)) |
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die("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
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hmap = CreateFileMapping(osfhandle, NULL, |
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prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL); |
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if (!hmap) { |
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errno = EINVAL; |
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return MAP_FAILED; |
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} |
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temp = MapViewOfFileEx(hmap, prot == PROT_READ ? |
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FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start); |
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if (!CloseHandle(hmap)) |
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warning("unable to close file mapping handle"); |
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if (temp) |
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return temp; |
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errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL; |
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return MAP_FAILED; |
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} |
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int git_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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