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https://github.com/git/git.git
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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"
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void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
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{
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HANDLE hmap;
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void *temp;
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off_t len;
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struct stat st;
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uint64_t o = offset;
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uint32_t l = o & 0xFFFFFFFF;
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uint32_t h = (o >> 32) & 0xFFFFFFFF;
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if (!fstat(fd, &st))
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len = st.st_size;
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else
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die("mmap: could not determine filesize");
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if ((length + offset) > len)
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length = xsize_t(len - offset);
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if (!(flags & MAP_PRIVATE))
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die("Invalid usage of mmap when built with USE_WIN32_MMAP");
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hmap = CreateFileMapping((HANDLE)_get_osfhandle(fd), 0, PAGE_WRITECOPY,
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0, 0, 0);
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if (!hmap)
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return MAP_FAILED;
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temp = MapViewOfFileEx(hmap, FILE_MAP_COPY, h, l, length, start);
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if (!CloseHandle(hmap))
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warning("unable to close file mapping handle\n");
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return temp ? temp : MAP_FAILED;
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}
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int git_munmap(void *start, size_t length)
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{
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return !UnmapViewOfFile(start);
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}
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