mirror of
https://github.com/git/git.git
synced 2024-10-31 14:27:54 +01:00
60890cc60c
The git_mmap implementation was broken for file sizes that wouldn't fit into a size_t (32 bits). This was caused by intermediate variables that were only 32 bits wide when they should be 64 bits. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
41 lines
903 B
C
41 lines
903 B
C
#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), 0, PAGE_WRITECOPY,
|
|
0, 0, 0);
|
|
|
|
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\n");
|
|
|
|
return temp ? temp : MAP_FAILED;
|
|
}
|
|
|
|
int git_munmap(void *start, size_t length)
|
|
{
|
|
return !UnmapViewOfFile(start);
|
|
}
|