#include "common.h" #include <windows.h> static inline size_t xsize_t(off_t len) { if (len > (size_t) len) die("Cannot handle files this big"); return (size_t)len; } void *win32_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 printf("mmap: could not determine filesize"); if ((length + offset) > len) length = xsize_t(len - offset); if (!(flags & MAP_PRIVATE)) printf("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)) printf("unable to close file mapping handle"); return temp ? temp : MAP_FAILED; } int win32_munmap(void *start, size_t length) { return !UnmapViewOfFile(start); }