freshlybakedca.ke
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1#define DISABLE_SIGN_COMPARE_WARNINGS
2
3#include "../git-compat-util.h"
4
5void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
6{
7 HANDLE osfhandle, hmap;
8 void *temp;
9 LARGE_INTEGER len;
10 uint64_t o = offset;
11 uint32_t l = o & 0xFFFFFFFF;
12 uint32_t h = (o >> 32) & 0xFFFFFFFF;
13
14 osfhandle = (HANDLE)_get_osfhandle(fd);
15 if (!GetFileSizeEx(osfhandle, &len))
16 die("mmap: could not determine filesize");
17
18 if ((length + offset) > len.QuadPart)
19 length = xsize_t(len.QuadPart - offset);
20
21 if (!(flags & MAP_PRIVATE))
22 die("Invalid usage of mmap when built with USE_WIN32_MMAP");
23
24 hmap = CreateFileMapping(osfhandle, NULL,
25 prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL);
26
27 if (!hmap) {
28 errno = EINVAL;
29 return MAP_FAILED;
30 }
31
32 temp = MapViewOfFileEx(hmap, prot == PROT_READ ?
33 FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start);
34
35 if (!CloseHandle(hmap))
36 warning("unable to close file mapping handle");
37
38 if (temp)
39 return temp;
40
41 errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL;
42 return MAP_FAILED;
43}
44
45int git_munmap(void *start, size_t length UNUSED)
46{
47 return !UnmapViewOfFile(start);
48}