| 1 | #define DISABLE_SIGN_COMPARE_WARNINGS |
| 2 | |
| 3 | #include "../git-compat-util.h" |
| 4 | |
| 5 | void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| 6 | { |
| 7 | HANDLE osfhandle, hmap; |
| 8 | void *temp; |
| 9 | LARGE_INTEGER len; |
| 10 | uint64_t o = offset; |
| 11 | uint32_t l = o & 0xFFFFFFFF; |
| 12 | uint32_t h = (o >> 32) & 0xFFFFFFFF; |
| 13 | |
| 14 | osfhandle = (HANDLE)_get_osfhandle(fd); |
| 15 | if (!GetFileSizeEx(osfhandle, &len)) |
| 16 | die("mmap: could not determine filesize"); |
| 17 | |
| 18 | if ((length + offset) > len.QuadPart) |
| 19 | length = xsize_t(len.QuadPart - offset); |
| 20 | |
| 21 | if (!(flags & MAP_PRIVATE)) |
| 22 | die("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
| 23 | |
| 24 | hmap = CreateFileMapping(osfhandle, NULL, |
| 25 | prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL); |
| 26 | |
| 27 | if (!hmap) { |
| 28 | errno = EINVAL; |
| 29 | return MAP_FAILED; |
| 30 | } |
| 31 | |
| 32 | temp = MapViewOfFileEx(hmap, prot == PROT_READ ? |
| 33 | FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start); |
| 34 | |
| 35 | if (!CloseHandle(hmap)) |
| 36 | warning("unable to close file mapping handle"); |
| 37 | |
| 38 | if (temp) |
| 39 | return temp; |
| 40 | |
| 41 | errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL; |
| 42 | return MAP_FAILED; |
| 43 | } |
| 44 | |
| 45 | int git_munmap(void *start, size_t length UNUSED) |
| 46 | { |
| 47 | return !UnmapViewOfFile(start); |
| 48 | } |