From 5c105d9f3fd086aff195d3849dcf847d6b0bd927 Mon Sep 17 00:00:00 2001
From: blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 5 Oct 2012 10:12:53 +0000
Subject: branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 tools/firmware-utils/src/xorimage.c | 135 ++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 tools/firmware-utils/src/xorimage.c

(limited to 'tools/firmware-utils/src/xorimage.c')

diff --git a/tools/firmware-utils/src/xorimage.c b/tools/firmware-utils/src/xorimage.c
new file mode 100644
index 000000000..b5ab83fa7
--- /dev/null
+++ b/tools/firmware-utils/src/xorimage.c
@@ -0,0 +1,135 @@
+/*
+ * xorimage.c - partially based on OpenWrt's addpattern.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+static char default_pattern[] = "12345678";
+
+
+int xor_data(uint8_t *data, size_t len, const uint8_t *pattern, int p_len, int p_off)
+{
+	int offset = p_off;
+	while (len--) {
+		*data ^= pattern[offset];
+		data++;
+		offset = (offset + 1) % p_len;
+	}
+	return offset;
+}
+
+
+void usage(void) __attribute__ (( __noreturn__ ));
+
+void usage(void)
+{
+	fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>]\n");
+	exit(EXIT_FAILURE);
+}
+
+
+int main(int argc, char **argv)
+{
+	char buf[1024];	/* keep this at 1k or adjust garbage calc below */
+	FILE *in = stdin;
+	FILE *out = stdout;
+	char *ifn = NULL;
+	char *ofn = NULL;
+	const char *pattern = default_pattern;
+	int c;
+	int v0, v1, v2;
+	size_t n;
+	int p_len, p_off = 0;
+
+	while ((c = getopt(argc, argv, "i:o:p:h")) != -1) {
+		switch (c) {
+			case 'i':
+				ifn = optarg;
+				break;
+			case 'o':
+				ofn = optarg;
+				break;
+			case 'p':
+				pattern = optarg;
+				break;
+			case 'h':
+			default:
+				usage();
+		}
+	}
+
+	if (optind != argc || optind == 1) {
+		fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]);
+		usage();
+	}
+
+	if (ifn && !(in = fopen(ifn, "r"))) {
+		fprintf(stderr, "can not open \"%s\" for reading\n", ifn);
+		usage();
+	}
+
+	if (ofn && !(out = fopen(ofn, "w"))) {
+		fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
+		usage();
+	}
+
+	p_len = strlen(pattern);
+
+	if (p_len == 0) {
+		fprintf(stderr, "pattern cannot be empty\n");
+		usage();
+	}
+
+
+	while ((n = fread(buf, 1, sizeof(buf), in)) > 0) {
+		if (n < sizeof(buf)) {
+			if (ferror(in)) {
+			FREAD_ERROR:
+				fprintf(stderr, "fread error\n");
+				return EXIT_FAILURE;
+			}
+		}
+
+		p_off = xor_data(buf, n, pattern, p_len, p_off);
+
+		if (!fwrite(buf, n, 1, out)) {
+		FWRITE_ERROR:
+			fprintf(stderr, "fwrite error\n");
+			return EXIT_FAILURE;
+		}
+	}
+
+	if (ferror(in)) {
+		goto FREAD_ERROR;
+	}
+
+	if (fflush(out)) {
+		goto FWRITE_ERROR;
+	}
+
+	fclose(in);
+	fclose(out);
+
+	return EXIT_SUCCESS;
+}
-- 
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