Zheng Bao | 5451672 | 2012-10-22 16:41:42 +0800 | [diff] [blame] | 1 | #include "common.h" |
| 2 | #include <windows.h> |
| 3 | |
| 4 | static inline size_t xsize_t(off_t len) |
| 5 | { |
| 6 | if (len > (size_t) len) |
| 7 | die("Cannot handle files this big"); |
| 8 | return (size_t)len; |
| 9 | } |
| 10 | |
| 11 | void *win32_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) |
| 12 | { |
| 13 | HANDLE hmap; |
| 14 | void *temp; |
| 15 | off_t len; |
| 16 | struct stat st; |
| 17 | uint64_t o = offset; |
| 18 | uint32_t l = o & 0xFFFFFFFF; |
| 19 | uint32_t h = (o >> 32) & 0xFFFFFFFF; |
| 20 | |
| 21 | if (!fstat(fd, &st)) |
| 22 | len = st.st_size; |
| 23 | else |
| 24 | printf("mmap: could not determine filesize"); |
| 25 | |
| 26 | if ((length + offset) > len) |
| 27 | length = xsize_t(len - offset); |
| 28 | |
| 29 | if (!(flags & MAP_PRIVATE)) |
| 30 | printf("Invalid usage of mmap when built with USE_WIN32_MMAP"); |
| 31 | |
| 32 | hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY, |
| 33 | 0, 0, 0); |
| 34 | |
| 35 | if (!hmap) |
| 36 | return MAP_FAILED; |
| 37 | |
| 38 | temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start); |
| 39 | |
| 40 | if (!CloseHandle(hmap)) |
| 41 | printf("unable to close file mapping handle"); |
| 42 | |
| 43 | return temp ? temp : MAP_FAILED; |
| 44 | } |
| 45 | |
| 46 | int win32_munmap(void *start, size_t length) |
| 47 | { |
| 48 | return !UnmapViewOfFile(start); |
| 49 | } |