From ee59bcd37dec47d313d99e245f72d707cbde9aee Mon Sep 17 00:00:00 2001
From: Ian McLean <ian.mclean@gmail.com>
Date: Mon, 1 Mar 2010 14:58:45 -0500
Subject: [PATCH] Fix for issue 365: "Out of memory? mmap failed"

The git_mmap implementation was broken for file sizes that
wouldn't fit into a size_t (32 bits).  Changed 'len' to be stored
in an off_t (64 bit) variable, and moved the xsize_t cast to only
occur when an attempt is made to map past the end-of-file.
---
 compat/win32mmap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/compat/win32mmap.c b/compat/win32mmap.c
index 1c5a14922f..b58aa69fa0 100644
--- a/compat/win32mmap.c
+++ b/compat/win32mmap.c
@@ -4,19 +4,19 @@ void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t of
 {
 	HANDLE hmap;
 	void *temp;
-	size_t len;
+	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 = xsize_t(st.st_size);
+		len = st.st_size;
 	else
 		die("mmap: could not determine filesize");
 
 	if ((length + offset) > len)
-		length = len - offset;
+		length = xsize_t(len - offset);
 
 	if (!(flags & MAP_PRIVATE))
 		die("Invalid usage of mmap when built with USE_WIN32_MMAP");