Add support for the generic Telechips firmware format checksums - use -tcc=sum if the header just contains a single checksum, or -tcc=crc if the header contains two 32-bit CRCs. Credit goes to Hein-Pieter van Braam for his work on identifying the (reverse) CRC32 algorithm used when calculating the two CRCs
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14917 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman
parent
0f5d9f9125
commit
41541c5c31
5 changed files with 220 additions and 7 deletions
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@ -336,6 +336,7 @@ Alexander Eickhoff
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Pinitnun Shanasabang
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Ken Fazzone
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David Bishop
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Hein-Pieter van Braam
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The libmad team
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The wavpack team
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@ -16,15 +16,16 @@ CLEANALL := scramble descramble iriver sh2d bmp2rb rdf2binary convbdf \
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all:
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@echo "Run make in your build directory!"
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scramble: scramble.o iriver.o mi4.o gigabeat.o gigabeats.o
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scramble: scramble.o iriver.o mi4.o gigabeat.o gigabeats.o telechips.o
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descramble: descramble.o iriver.o gigabeat.o
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scramble.o: scramble.c iriver.h mi4.h gigabeat.h
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scramble.o: scramble.c iriver.h mi4.h gigabeat.h telechips.h
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descramble.o: descramble.c iriver.h gigabeat.h
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iriver.o: iriver.c iriver.h
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gigabeat.o: gigabeat.c gigabeat.h
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gigabeats.o: gigabeats.c gigabeats.h
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mi4.o: mi4.c mi4.h
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telechips.o: telechips.c telechips.h
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sh2d: sh2d.c
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@ -25,6 +25,7 @@
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#include "gigabeat.h"
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#include "gigabeats.h"
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#include "mi4.h"
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#include "telechips.h"
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int iaudio_encode(char *iname, char *oname, char *idstring);
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int ipod_encode(char *iname, char *oname, int fw_ver, bool fake_rsrc);
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@ -102,6 +103,7 @@ void usage(void)
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"\t -model=XXXX where XXXX is the model id string\n"
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"\t -type=XXXX where XXXX is a string indicating the \n"
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"\t type of binary, eg. RBOS, RBBL\n"
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"\t-tcc=X Telechips generic firmware format (X values: sum, crc)\n"
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"\t-add=X Rockbox generic \"add-up\" checksum format\n"
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"\t (X values: h100, h120, h140, h300, ipco, nano, ipvd, mn2g\n"
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"\t ip3g, ip4g, mini, iax5, h10, h10_5gb, tpj2,\n"
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@ -127,7 +129,7 @@ int main (int argc, char** argv)
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unsigned long modelnum;
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char modelname[5];
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int model_id;
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enum { none, scramble, xor, add } method = scramble;
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enum { none, scramble, xor, tcc_sum, tcc_crc, add } method = scramble;
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model_id = ARCHOS_PLAYER;
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@ -186,6 +188,20 @@ int main (int argc, char** argv)
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return -1;
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}
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}
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else if(!strncmp(argv[1], "-tcc=", 4)) {
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headerlen = 0;
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iname = argv[2];
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oname = argv[3];
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if(!strcmp(&argv[1][5], "sum"))
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method = tcc_sum;
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else if(!strcmp(&argv[1][5], "crc"))
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method = tcc_crc;
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else {
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fprintf(stderr, "unsupported TCC method: %s\n", &argv[1][5]);
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return 2;
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}
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}
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else if(!strncmp(argv[1], "-add=", 5)) {
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iname = argv[2];
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oname = argv[3];
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@ -409,7 +425,7 @@ int main (int argc, char** argv)
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break;
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}
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if(method != add) {
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if((method == none) || (method == scramble) || (method == xor)) {
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/* calculate checksum */
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for (i=0;i<length;i++)
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crc += inbuf[i];
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@ -426,6 +442,17 @@ int main (int argc, char** argv)
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headerlen = 8;
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}
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break;
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case tcc_sum:
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memcpy(outbuf, inbuf, length); /* the input buffer to output*/
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telechips_encode_sum(outbuf, length);
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break;
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case tcc_crc:
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memcpy(outbuf, inbuf, length); /* the input buffer to output*/
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telechips_encode_crc(outbuf, length);
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break;
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case scramble:
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if (headerlen == 6) {
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int2be(length, header);
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@ -488,9 +515,11 @@ int main (int argc, char** argv)
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perror(oname);
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return -1;
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}
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if ( !fwrite(header,headerlen,1,file) ) {
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perror(oname);
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return -1;
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if (headerlen > 0) {
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if ( !fwrite(header,headerlen,1,file) ) {
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perror(oname);
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return -1;
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}
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}
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if ( !fwrite(outbuf,length,1,file) ) {
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perror(oname);
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156
tools/telechips.c
Normal file
156
tools/telechips.c
Normal file
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@ -0,0 +1,156 @@
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Telechips firmware checksum support for scramble
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*
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* Copyright (C) 2007 Dave Chapman
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*
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* Thanks to Hein-Pieter van Braam for his work in identifying the
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* CRC algorithm used.
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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static uint32_t crctable[256];
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/* Simple implementation of a function to reverse the bottom n bits in x */
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static uint32_t bitreverse(uint32_t x,int n)
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{
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int i;
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uint32_t mask = 1<<(n-1);
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uint32_t res = 0;
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for (i=0; i<n; i++)
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{
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if (x & 1)
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res |= mask;
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x >>= 1;
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mask >>= 1;
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}
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return res;
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}
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/* Generate a lookup table for a reverse CRC32 */
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static void gentable(uint32_t poly)
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{
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int i;
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uint32_t r;
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uint32_t index;
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for (index = 0; index < 256; index++)
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{
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r = bitreverse(index,8) << 24;
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for (i=0; i<8; i++)
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{
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if (r & (1 << 31))
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r = (r << 1) ^ poly;
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else
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r<<=1;
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}
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crctable[index] = bitreverse(r,32);
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}
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}
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/* Perform a reverse CRC32 */
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static uint32_t calc_crc(unsigned char *message, int size)
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{
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uint32_t crc = 0;
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int i;
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for (i=0; i < size; i++){
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if ((i < 0x10) || (i >= 0x18)) {
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crc = crctable[((crc ^ (message[i])) & 0xff)] ^ (crc >> 8);
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}
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}
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return crc;
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}
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/* Endian-safe functions to read/write a 32-bit little-endian integer */
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static uint32_t get_uint32le(unsigned char* p)
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{
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return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
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}
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static void put_uint32le(unsigned char* p, uint32_t x)
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{
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p[0] = x & 0xff;
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p[1] = (x >> 8) & 0xff;
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p[2] = (x >> 16) & 0xff;
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p[3] = (x >> 24) & 0xff;
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}
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/* A simple checksum - seems to be used by the TCC76x firmwares */
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void telechips_encode_sum(unsigned char* buf, int length)
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{
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uint32_t sum;
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int i;
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/* Set checksum field to 0 */
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put_uint32le(buf + 0x10, 0);
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/* Perform a simple sum, treating the file as a series of 32-bit
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little-endian integers */
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sum = 0;
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for (i=0; i < length; i+=4) {
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sum += get_uint32le(buf + i);
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}
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/* Negate the sum - this means that the sum of the whole file
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(including this value) will be equal to zero */
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sum = -sum;
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/* Set the checksum field */
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put_uint32le(buf + 0x10, sum);
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}
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/* Two reverse CRC32 checksums - seems to be used by the TCC77x firmwares */
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void telechips_encode_crc(unsigned char* buf, int length)
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{
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uint32_t crc1,crc2;
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/* Generate the CRC table */
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gentable(0x8001801BL);
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/* Clear the existing CRC values */
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put_uint32le(buf+0x10, 0);
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put_uint32le(buf+0x18, 0);
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/* Write the length */
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put_uint32le(buf+0x1c, length);
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/* Calculate the first CRC - over the entire file */
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crc1 = calc_crc(buf, length);
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/* What happens next depends on the filesize */
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if (length >= 128*1024)
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{
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put_uint32le(buf+0x18, crc1);
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crc2 = calc_crc(buf, 128*1024);
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put_uint32le(buf+0x10, crc2);
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} else {
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put_uint32le(buf+0x10, crc1);
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}
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}
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26
tools/telechips.h
Normal file
26
tools/telechips.h
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@ -0,0 +1,26 @@
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _TELECHIPS_H
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#define _TELECHIPS_H
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void telechips_encode_sum(unsigned char* buf, int length);
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void telechips_encode_crc(unsigned char* buf, int length);
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#endif
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