| #include "../git-compat-util.h" |
| |
| void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| { |
| HANDLE hmap; |
| void *temp; |
| off_t len; |
| struct stat st; |
| uint64_t o = offset; |
| uint32_t l = o & 0xFFFFFFFF; |
| uint32_t h = (o >> 32) & 0xFFFFFFFF; |
| |
| if (!fstat(fd, &st)) |
| len = st.st_size; |
| else |
| die("mmap: could not determine filesize"); |
| |
| if ((length + offset) > len) |
| length = xsize_t(len - offset); |
| |
| if (!(flags & MAP_PRIVATE)) |
| die("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
| |
| hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY, |
| 0, 0, 0); |
| |
| if (!hmap) |
| return MAP_FAILED; |
| |
| temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start); |
| |
| if (!CloseHandle(hmap)) |
| warning("unable to close file mapping handle"); |
| |
| return temp ? temp : MAP_FAILED; |
| } |
| |
| int git_munmap(void *start, size_t length) |
| { |
| return !UnmapViewOfFile(start); |
| } |