iAudio: first version of a tool to update fw checksum

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7156 a1c6a512-1295-4272-9138-f99709370657

tools/Makefile

@@ -9,17 +9,19 @@
 CFLAGS := -O -ansi -g
 LDFLAGS := -g
 
-TARGETS := scramble descramble sh2d bmp2rb rdf2binary convbdf generate_rocklatin mkboot
+TARGETS := scramble descramble iaudio sh2d bmp2rb rdf2binary convbdf generate_rocklatin mkboot
 
 all: $(TARGETS)
 	@echo "tools done"
 
 scramble: scramble.o iriver.o
 descramble: descramble.o iriver.o
+iaudio: iaudio.o
 
 scramble.o: scramble.c iriver.h
 descramble.o: descramble.c iriver.h
 iriver.o: iriver.c iriver.h
+iaudio.o: iaudio.c
 
 sh2d: sh2d.c
 

tools/iaudio.c

@@ -0,0 +1,108 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 by Christian Gmeiner
+ *
+ * This particular source code file is licensed under the X11 license. See the
+ * bottom of the COPYING file for details on this license.
+ *
+ ****************************************************************************/
+ 
+/* This little application updates the checksum of a modifized iAudio x5
+   firmware bin.
+   And this is how it works:
+
+   The byte at offset 0x102b contains the 8-bit sum of all the bytes starting with the one at 0x1030.    
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CHECKSUM_BIT    0x102b
+#define CHECKSUM_START	0x1030
+
+void usage(void) {
+
+    printf("usage: iaudio <input file> <output file>\n");
+    printf("\n\nThis tool updates the checksum of an iaudio fw bin\n");
+    exit(1);
+}
+
+int main (int argc, char* argv[]) {
+
+    char byte = '\0';
+    char checksum = '\0';
+    unsigned long length, i;
+    unsigned char* inbuf;
+    unsigned char* iname = argv[1];
+    unsigned char* oname = argv[2];
+    FILE* pFile;
+
+    if (argc < 2) {
+        usage();
+    }
+
+    /* open file */
+    pFile = fopen(iname,"rb");
+    if (!pFile) {
+       perror(oname);
+       return -1;
+    }
+
+    /* print old checksum */
+    fseek (pFile, CHECKSUM_BIT, SEEK_SET);
+    byte = fgetc(pFile);
+    printf("Old checksum: 0x%02x\n", (unsigned char) byte);
+
+    /* get file size*/
+    fseek(pFile,0,SEEK_END);
+    length = ftell(pFile);
+    fseek(pFile,0,SEEK_SET);
+
+    /* try to allocate memory */
+    inbuf = malloc(length);
+    if (!inbuf) {
+       printf("out of memory!\n");
+       return -1;
+    }
+
+    /* read file */
+    i = fread(inbuf, 1, length, pFile);
+    if (!i) {
+       perror(iname);
+       return -1;
+    }
+    fclose(pFile);
+
+    /* calculate new checksum */
+    for (i = CHECKSUM_START; i < length; i++) {
+        checksum += inbuf[i];
+    }
+    printf("New checksum: 0x%02x\n", (unsigned char) checksum);
+
+    /* save new checksum */
+    inbuf[CHECKSUM_BIT] = (unsigned char) checksum;
+
+    /* save inbuf */
+    pFile = fopen(oname,"wb");
+    if (!pFile) {
+       perror(oname);
+       return -1;
+    }
+
+    i = fwrite(inbuf, 1, length, pFile);
+    if (!i) {
+        perror(oname);
+        return -1;
+    }
+    fclose(pFile);
+
+    return 0;
+}