317 lines
12 KiB
C
317 lines
12 KiB
C
/*
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* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* July 29, 2004
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*
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* This is a hacked replacement for the 'trx' utility used to create
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* wrt54g .trx firmware files. It isn't pretty, but it does the job
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* for me.
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*
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* As an extension, you can specify a larger maximum length for the
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* .trx file using '-m'. It will be rounded up to be a multiple of 4K.
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* NOTE: This space will be malloc()'d.
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*
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* TODO: Support '-b' option to specify offsets for each file.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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uint32_t crc32buf(char *buf, size_t len);
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/**********************************************************************/
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/* from trxhdr.h */
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#define TRX_MAGIC 0x30524448 /* "HDR0" */
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#define TRX_VERSION 1
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#define TRX_MAX_LEN 0x3A0000
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#define TRX_NO_HEADER 1 /* Do not write TRX header */
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struct trx_header {
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uint32_t magic; /* "HDR0" */
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uint32_t len; /* Length of file including header */
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uint32_t crc32; /* 32-bit CRC from flag_version to end of file */
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uint32_t flag_version; /* 0:15 flags, 16:31 version */
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uint32_t offsets[3]; /* Offsets of partitions from start of header */
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};
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/**********************************************************************/
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void usage(void) __attribute__ (( __noreturn__ ));
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void usage(void)
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{
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fprintf(stderr, "Usage: trx [-o outfile] [-m maxlen] file [file [file]]\n");
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exit(EXIT_FAILURE);
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}
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int main(int argc, char **argv)
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{
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FILE *out = stdout;
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FILE *in;
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char *ofn = NULL;
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char *buf;
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char *e;
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int c, i;
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size_t n;
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unsigned long maxlen = TRX_MAX_LEN;
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struct trx_header *p;
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fprintf(stderr, "mjn3's trx replacement - v0.80\n");
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while ((c = getopt(argc, argv, "o:m:")) != -1) {
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switch (c) {
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case 'o':
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ofn = optarg;
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break;
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case 'm':
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errno = 0;
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maxlen = strtoul(optarg, &e, 0);
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if (errno || (e == optarg) || *e) {
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fprintf(stderr, "illegal numeric string\n");
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usage();
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}
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#undef ROUND
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#define ROUND 0x1000
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if (maxlen & (ROUND-1)) {
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maxlen += (ROUND - (maxlen & (ROUND-1)));
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}
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if (maxlen < ROUND) {
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fprintf(stderr, "maxlen too small (or wrapped)\n");
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usage();
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}
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break;
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default:
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usage();
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}
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}
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if (ofn && !(out = fopen(ofn, "w"))) {
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fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
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usage();
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}
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if (optind == argc) {
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fprintf(stderr, "we require at least one arg\n");
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usage();
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}
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if (argc - optind > 3) {
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fprintf(stderr, "too many args: %d > 3\n", argc - optind);
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usage();
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}
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if (maxlen > TRX_MAX_LEN) {
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fprintf(stderr, "WARNING: maxlen exceeds default maximum! Beware of overwriting nvram!\n");
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}
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if (!(buf = malloc(maxlen))) {
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fprintf(stderr, "malloc failed\n");
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return EXIT_FAILURE;
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}
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p = (struct trx_header *) buf;
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p->magic = TRX_MAGIC;
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p->len = sizeof(struct trx_header);
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p->flag_version = (TRX_VERSION << 16);
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i = 0;
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while (optind < argc) {
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p->offsets[i++] = p->len;
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if (!(in = fopen(argv[optind], "r"))) {
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fprintf(stderr, "can not open \"%s\" for reading\n", argv[optind]);
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usage();
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}
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n = fread(buf + p->len, 1, maxlen - p->len, in);
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if (!feof(in)) {
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fprintf(stderr, "fread failure or file \"%s\" too large\n",
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argv[optind]);
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fclose(in);
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return EXIT_FAILURE;
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}
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fclose(in);
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++optind;
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if (optind < argc) {
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#undef ROUND
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#define ROUND 4
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if (n & (ROUND-1)) {
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memset(buf + p->len + n, 0, ROUND - (n & (ROUND-1)));
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n += ROUND - (n & (ROUND-1));
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}
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}
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p->len += n;
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}
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#undef ROUND
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#define ROUND 0x1000
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n = p->len & (ROUND-1);
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if (n) {
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memset(buf + p->len, 0, ROUND - n);
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p->len += ROUND - n;
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}
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p->crc32 = crc32buf((char *) &p->flag_version,
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p->len - offsetof(struct trx_header, flag_version));
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if (!fwrite(buf, p->len, 1, out) || fflush(out)) {
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fprintf(stderr, "fwrite failed\n");
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return EXIT_FAILURE;
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}
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fclose(out);
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return EXIT_SUCCESS;
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}
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/**********************************************************************/
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/* The following was grabbed and tweaked from the old snippets collection
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* of public domain C code. */
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/**********************************************************************\
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|* Demonstration program to compute the 32-bit CRC used as the frame *|
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|* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 *|
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|* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level *|
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|* protocol). The 32-bit FCS was added via the Federal Register, *|
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|* 1 June 1982, p.23798. I presume but don't know for certain that *|
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|* this polynomial is or will be included in CCITT V.41, which *|
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|* defines the 16-bit CRC (often called CRC-CCITT) polynomial. FIPS *|
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|* PUB 78 says that the 32-bit FCS reduces otherwise undetected *|
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|* errors by a factor of 10^-5 over 16-bit FCS. *|
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\**********************************************************************/
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/* Copyright (C) 1986 Gary S. Brown. You may use this program, or
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code or tables extracted from it, as desired without restriction.*/
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/* First, the polynomial itself and its table of feedback terms. The */
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/* polynomial is */
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/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
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/* Note that we take it "backwards" and put the highest-order term in */
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/* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
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/* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
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/* the MSB being 1. */
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/* Note that the usual hardware shift register implementation, which */
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/* is what we're using (we're merely optimizing it by doing eight-bit */
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/* chunks at a time) shifts bits into the lowest-order term. In our */
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/* implementation, that means shifting towards the right. Why do we */
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/* do it this way? Because the calculated CRC must be transmitted in */
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/* order from highest-order term to lowest-order term. UARTs transmit */
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/* characters in order from LSB to MSB. By storing the CRC this way, */
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/* we hand it to the UART in the order low-byte to high-byte; the UART */
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/* sends each low-bit to hight-bit; and the result is transmission bit */
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/* by bit from highest- to lowest-order term without requiring any bit */
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/* shuffling on our part. Reception works similarly. */
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/* The feedback terms table consists of 256, 32-bit entries. Notes: */
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/* */
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/* 1. The table can be generated at runtime if desired; code to do so */
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/* is shown later. It might not be obvious, but the feedback */
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/* terms simply represent the results of eight shift/xor opera- */
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/* tions for all combinations of data and CRC register values. */
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/* */
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/* 2. The CRC accumulation logic is the same for all CRC polynomials, */
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/* be they sixteen or thirty-two bits wide. You simply choose the */
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/* appropriate table. Alternatively, because the table can be */
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/* generated at runtime, you can start by generating the table for */
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/* the polynomial in question and use exactly the same "updcrc", */
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/* if your application needn't simultaneously handle two CRC */
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/* polynomials. (Note, however, that XMODEM is strange.) */
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/* */
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/* 3. For 16-bit CRCs, the table entries need be only 16 bits wide; */
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/* of course, 32-bit entries work OK if the high 16 bits are zero. */
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/* */
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/* 4. The values must be right-shifted by eight bits by the "updcrc" */
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/* logic; the shift must be unsigned (bring in zeroes). On some */
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/* hardware you could probably optimize the shift in assembler by */
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/* using byte-swap instructions. */
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static const uint32_t crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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#define UPDC32(octet,crc) (crc_32_tab[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
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uint32_t crc32buf(char *buf, size_t len)
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{
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uint32_t crc;
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crc = 0xFFFFFFFF;
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for ( ; len; --len, ++buf)
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{
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crc = UPDC32(*buf, crc);
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}
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return crc;
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}
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