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| 1 | +#include "../git-compat-util.h" |
| 2 | + |
| 3 | +/* |
| 4 | + * Note that this doesn't return the actual pagesize, but |
| 5 | + * the allocation granularity. If future Windows specific git code |
| 6 | + * needs the real getpagesize function, we need to find another solution. |
| 7 | + */ |
| 8 | +int mingw_getpagesize(void) |
| 9 | +{ |
| 10 | + SYSTEM_INFO si; |
| 11 | + GetSystemInfo(&si); |
| 12 | + return si.dwAllocationGranularity; |
| 13 | +} |
| 14 | + |
| 15 | +void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| 16 | +{ |
| 17 | + HANDLE hmap; |
| 18 | + void *temp; |
| 19 | + size_t len; |
| 20 | + struct stat st; |
| 21 | + uint64_t o = offset; |
| 22 | + uint32_t l = o & 0xFFFFFFFF; |
| 23 | + uint32_t h = (o >> 32) & 0xFFFFFFFF; |
| 24 | + |
| 25 | + if (!fstat(fd, &st)) |
| 26 | + len = xsize_t(st.st_size); |
| 27 | + else |
| 28 | + die("mmap: could not determine filesize"); |
| 29 | + |
| 30 | + if ((length + offset) > len) |
| 31 | + length = len - offset; |
| 32 | + |
| 33 | + if (!(flags & MAP_PRIVATE)) |
| 34 | + die("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
| 35 | + |
| 36 | + hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY, |
| 37 | + 0, 0, 0); |
| 38 | + |
| 39 | + if (!hmap) |
| 40 | + return MAP_FAILED; |
| 41 | + |
| 42 | + temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start); |
| 43 | + |
| 44 | + if (!CloseHandle(hmap)) |
| 45 | + warning("unable to close file mapping handle\n"); |
| 46 | + |
| 47 | + return temp ? temp : MAP_FAILED; |
| 48 | +} |
| 49 | + |
| 50 | +int git_munmap(void *start, size_t length) |
| 51 | +{ |
| 52 | + return !UnmapViewOfFile(start); |
| 53 | +} |
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