| #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), NULL, | |
| PAGE_WRITECOPY, 0, 0, NULL); | |
| 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); | |
| } |