From 5408e20d80b87731e90840b5cc983a6717c851a5 Mon Sep 17 00:00:00 2001
From: Johannes Hofmann <Johannes.Hofmann@gmx.de>
Date: Thu, 17 Jul 2008 21:12:10 +0200
Subject: copy instead of rename - in case /tmp is another filesystem

---
 src/ImageMetaData.cxx | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

(limited to 'src/ImageMetaData.cxx')

diff --git a/src/ImageMetaData.cxx b/src/ImageMetaData.cxx
index 07a5c1b..e29bd03 100644
--- a/src/ImageMetaData.cxx
+++ b/src/ImageMetaData.cxx
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <math.h>
 #include <string.h>
+#include <fcntl.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
@@ -259,15 +260,34 @@ ImageMetaData::save_image_jpgcom(char *in_img, char *out_img) {
 		err++;
 	}
 
-    close(tmp_fd);
-
 	if (!err) {
-		if (rename(tmpname, out_img) != 0) {
-			perror("rename");
+		int out_fd = open(out_img, O_WRONLY|O_TRUNC);
+
+		lseek(tmp_fd, 0, SEEK_SET);
+		
+		if (out_fd == -1) {
+			perror("open");
 			err++;
+		} else {
+			while ((n = read(tmp_fd, buf, sizeof(buf)))) {
+				if (write(out_fd, buf, n) != n) {
+					perror("write");
+					fprintf(stderr, "ERROR: Image %s might be corrupted. "
+						"A copy is still available at %s\n", out_img, tmpname);
+					err++;
+					break;
+				}
+			}
+
+			close(out_fd);
 		}
 	}
 
+    close(tmp_fd);
+
+	if (!err)	
+		unlink(tmpname);
+
     return err != 0;
 }
 
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