win32: Open or create files in binary mode

On windows, unless we use the O_BINARY flag in the open()
call, the file I/O routines will perform line ending
conversion (\r\n => \n on input, \n => \r\n on output).
In addition to the performance penalty, most files in the
object database are binary and will, therefore, become
corrupted by this conversion.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

src/fileops.c

@@ -3,13 +3,13 @@
 
 int gitfo_open(const char *path, int flags)
 {
-	int fd = open(path, flags);
+	int fd = open(path, flags | O_BINARY);
 	return fd >= 0 ? fd : git_os_error();
 }
 
 int gitfo_creat(const char *path, int mode)
 {
-	int fd = creat(path, mode);
+	int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
 	return fd >= 0 ? fd : git_os_error();
 }
 

src/fileops.h

@@ -15,6 +15,10 @@
 #include <time.h>
 #include <dirent.h>
 
+#if !defined(O_BINARY)
+#define O_BINARY 0
+#endif
+
 #define GITFO_BUF_INIT {NULL, 0}
 
 typedef int git_file;