41 lines
907 B
41 lines
907 B
#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 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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die("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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die("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
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hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), NULL, |
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PAGE_WRITECOPY, 0, 0, NULL); |
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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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warning("unable to close file mapping handle"); |
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return temp ? temp : 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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