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-rw-r--r--compat/win32mmap.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/compat/win32mmap.c b/compat/win32mmap.c
new file mode 100644
index 0000000..519d51f
--- /dev/null
+++ b/compat/win32mmap.c
@@ -0,0 +1,46 @@
+#include "../git-compat-util.h"
+
+void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
+{
+ HANDLE osfhandle, hmap;
+ void *temp;
+ LARGE_INTEGER len;
+ uint64_t o = offset;
+ uint32_t l = o & 0xFFFFFFFF;
+ uint32_t h = (o >> 32) & 0xFFFFFFFF;
+
+ osfhandle = (HANDLE)_get_osfhandle(fd);
+ if (!GetFileSizeEx(osfhandle, &len))
+ die("mmap: could not determine filesize");
+
+ if ((length + offset) > len.QuadPart)
+ length = xsize_t(len.QuadPart - offset);
+
+ if (!(flags & MAP_PRIVATE))
+ die("Invalid usage of mmap when built with USE_WIN32_MMAP");
+
+ hmap = CreateFileMapping(osfhandle, NULL,
+ prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL);
+
+ if (!hmap) {
+ errno = EINVAL;
+ return MAP_FAILED;
+ }
+
+ temp = MapViewOfFileEx(hmap, prot == PROT_READ ?
+ FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start);
+
+ if (!CloseHandle(hmap))
+ warning("unable to close file mapping handle");
+
+ if (temp)
+ return temp;
+
+ errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL;
+ return MAP_FAILED;
+}
+
+int git_munmap(void *start, size_t length)
+{
+ return !UnmapViewOfFile(start);
+}