From: Ian McLean <ian.mclean@gmail.com>
Date: Thu, 20 May 2010 18:57:51 +0000 (+0200)
Subject: Fix "Out of memory? mmap failed" for files larger than 4GB on Windows
X-Git-Tag: v1.7.2-rc0~3^2~20
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=60890cc60ccfc7000791a47f1f3d69fdb8884dd7;p=git.git

Fix "Out of memory? mmap failed" for files larger than 4GB on Windows

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>
---

diff --git a/compat/win32mmap.c b/compat/win32mmap.c
index 1c5a14922..b58aa69fa 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");