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#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);
}
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