tools/firmware-utils/src/trx.c

   1 /*
   2  * Copyright (C) 2004  Manuel Novoa III  <mjn3@codepoet.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18
  19 /* July 29, 2004
  20  *
  21  * This is a hacked replacement for the 'trx' utility used to create
  22  * wrt54g .trx firmware files.  It isn't pretty, but it does the job
  23  * for me.
  24  *
  25  * As an extension, you can specify a larger maximum length for the
  26  * .trx file using '-m'.  It will be rounded up to be a multiple of 4K.
  27  * NOTE: This space will be malloc()'d.
  28  *
  29  * August 16, 2004
  30  *
  31  * Sigh... Make it endian-neutral.
  32  *
  33  * TODO: Support '-b' option to specify offsets for each file.
  34  *
  35  * February 19, 2005 - mbm
  36  *
  37  * Add -a (align offset) and -b (absolute offset)
  38  */
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <stddef.h>
  43 #include <stdint.h>
  44 #include <string.h>
  45 #include <errno.h>
  46 #include <unistd.h>
  47
  48 #if __BYTE_ORDER == __BIG_ENDIAN
  49 #define STORE32_LE(X)           bswap_32(X)
  50 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  51 #define STORE32_LE(X)           (X)
  52 #else
  53 #error unkown endianness!
  54 #endif
  55
  56 uint32_t crc32buf(char *buf, size_t len);
  57
  58 /**********************************************************************/
  59 /* from trxhdr.h */
  60
  61 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  62 #define TRX_VERSION     1
  63 #define TRX_MAX_LEN     0x5A0000
  64 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  65
  66 struct trx_header {
  67         uint32_t magic;                 /* "HDR0" */
  68         uint32_t len;                   /* Length of file including header */
  69         uint32_t crc32;                 /* 32-bit CRC from flag_version to end of file */
  70         uint32_t flag_version;  /* 0:15 flags, 16:31 version */
  71         uint32_t offsets[3];    /* Offsets of partitions from start of header */
  72 };
  73
  74 /**********************************************************************/
  75
  76 void usage(void) __attribute__ (( __noreturn__ ));
  77
  78 void usage(void)
  79 {
  80         fprintf(stderr, "Usage: trx [-o outfile] [-m maxlen] [-a align] [-b offset] [-f file] [-f file [-f file]]\n");
  81         exit(EXIT_FAILURE);
  82 }
  83
  84 int main(int argc, char **argv)
  85 {
  86         FILE *out = stdout;
  87         FILE *in;
  88         char *ofn = NULL;
  89         char *buf;
  90         char *e;
  91         int c, i, append;
  92         size_t n;
  93         uint32_t cur_len;
  94         unsigned long maxlen = TRX_MAX_LEN;
  95         struct trx_header *p;
  96
  97         fprintf(stderr, "mjn3's trx replacement - v0.81.1\n");
  98
  99         if (!(buf = malloc(maxlen))) {
 100                 fprintf(stderr, "malloc failed\n");
 101                 return EXIT_FAILURE;
 102         }
 103
 104         p = (struct trx_header *) buf;
 105
 106         p->magic = STORE32_LE(TRX_MAGIC);
 107         cur_len = sizeof(struct trx_header);
 108         p->flag_version = STORE32_LE((TRX_VERSION << 16));
 109
 110         in = NULL;
 111         i = 0;
 112
 113         while ((c = getopt(argc, argv, "-:o:m:a:b:f:A:")) != -1) {
 114                 switch (c) {
 115                         case 'A':
 116                                 append = 1;
 117                                 /* fall through */
 118                         case 'f':
 119                         case 1:
 120                                 if (!append)
 121                                         p->offsets[i++] = STORE32_LE(cur_len);
 122
 123                                 if (!(in = fopen(optarg, "r"))) {
 124                                         fprintf(stderr, "can not open \"%s\" for reading\n", optarg);
 125                                         usage();
 126                                 }
 127                                 n = fread(buf + cur_len, 1, maxlen - cur_len, in);
 128                                 if (!feof(in)) {
 129                                         fprintf(stderr, "fread failure or file \"%s\" too large\n",optarg);
 130                                         fclose(in);
 131                                         return EXIT_FAILURE;
 132                                 }
 133                                 fclose(in);
 134 #undef  ROUND
 135 #define ROUND 4
 136                                 if (n & (ROUND-1)) {
 137                                         memset(buf + cur_len + n, 0, ROUND - (n & (ROUND-1)));
 138                                         n += ROUND - (n & (ROUND-1));
 139                                 }
 140                                 cur_len += n;
 141                                 append = 0;
 142
 143                                 break;
 144                         case 'o':
 145                                 ofn = optarg;
 146                                 if (ofn && !(out = fopen(ofn, "w"))) {
 147                                         fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
 148                                         usage();
 149                                 }
 150
 151                                 break;
 152                         case 'm':
 153                                 errno = 0;
 154                                 maxlen = strtoul(optarg, &e, 0);
 155                                 if (errno || (e == optarg) || *e) {
 156                                         fprintf(stderr, "illegal numeric string\n");
 157                                         usage();
 158                                 }
 159 #undef  ROUND
 160 #define ROUND 0x1000
 161                                 if (maxlen & (ROUND-1)) {
 162                                         maxlen += (ROUND - (maxlen & (ROUND-1)));
 163                                 }
 164                                 if (maxlen < ROUND) {
 165                                         fprintf(stderr, "maxlen too small (or wrapped)\n");
 166                                         usage();
 167                                 }
 168                                 if (maxlen > TRX_MAX_LEN) {
 169                                         fprintf(stderr, "WARNING: maxlen exceeds default maximum!  Beware of overwriting nvram!\n");
 170                                 }
 171                                 if (!(buf = realloc(buf,maxlen))) {
 172                                         fprintf(stderr, "realloc failed");
 173                                         return EXIT_FAILURE;
 174                                 }
 175                                 break;
 176                         case 'a':
 177                                 errno = 0;
 178                                 n = strtoul(optarg, &e, 0);
 179                                 if (errno || (e == optarg) || *e) {
 180                                         fprintf(stderr, "illegal numeric string\n");
 181                                         usage();
 182                                 }
 183                                 if (cur_len & (n-1)) {
 184                                         n = n - (cur_len & (n-1));
 185                                         memset(buf + cur_len, 0, n);
 186                                         cur_len += n;
 187                                 }
 188                                 break;
 189                         case 'b':
 190                                 errno = 0;
 191                                 n = strtoul(optarg, &e, 0);
 192                                 if (errno || (e == optarg) || *e) {
 193                                         fprintf(stderr, "illegal numeric string\n");
 194                                         usage();
 195                                 }
 196                                 if (n < cur_len) {
 197                                         fprintf(stderr, "WARNING: current length exceeds -b %d offset\n",n);
 198                                 } else {
 199                                         memset(buf + cur_len, 0, n - cur_len);
 200                                         cur_len = n;
 201                                 }
 202                                 break;
 203                         default:
 204                                 usage();
 205                 }
 206         }
 207
 208         if (!in) {
 209                 fprintf(stderr, "we require atleast one filename\n");
 210                 usage();
 211         }
 212
 213 #undef  ROUND
 214 #define ROUND 0x1000
 215         n = cur_len & (ROUND-1);
 216         if (n) {
 217                 memset(buf + cur_len, 0, ROUND - n);
 218                 cur_len += ROUND - n;
 219         }
 220
 221         p->crc32 = crc32buf((char *) &p->flag_version,
 222                                                 cur_len - offsetof(struct trx_header, flag_version));
 223         p->crc32 = STORE32_LE(p->crc32);
 224
 225         p->len = STORE32_LE(cur_len);
 226
 227         if (!fwrite(buf, cur_len, 1, out) || fflush(out)) {
 228                 fprintf(stderr, "fwrite failed\n");
 229                 return EXIT_FAILURE;
 230         }
 231
 232         fclose(out);
 233
 234         return EXIT_SUCCESS;
 235 }
 236
 237 /**********************************************************************/
 238 /* The following was grabbed and tweaked from the old snippets collection
 239  * of public domain C code. */
 240
 241 /**********************************************************************\
 242 |* Demonstration program to compute the 32-bit CRC used as the frame  *|
 243 |* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71     *|
 244 |* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level     *|
 245 |* protocol).  The 32-bit FCS was added via the Federal Register,     *|
 246 |* 1 June 1982, p.23798.  I presume but don't know for certain that   *|
 247 |* this polynomial is or will be included in CCITT V.41, which        *|
 248 |* defines the 16-bit CRC (often called CRC-CCITT) polynomial.  FIPS  *|
 249 |* PUB 78 says that the 32-bit FCS reduces otherwise undetected       *|
 250 |* errors by a factor of 10^-5 over 16-bit FCS.                       *|
 251 \**********************************************************************/
 252
 253 /* Copyright (C) 1986 Gary S. Brown.  You may use this program, or
 254    code or tables extracted from it, as desired without restriction.*/
 255
 256 /* First, the polynomial itself and its table of feedback terms.  The  */
 257 /* polynomial is                                                       */
 258 /* 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 */
 259 /* Note that we take it "backwards" and put the highest-order term in  */
 260 /* the lowest-order bit.  The X^32 term is "implied"; the LSB is the   */
 261 /* X^31 term, etc.  The X^0 term (usually shown as "+1") results in    */
 262 /* the MSB being 1.                                                    */
 263
 264 /* Note that the usual hardware shift register implementation, which   */
 265 /* is what we're using (we're merely optimizing it by doing eight-bit  */
 266 /* chunks at a time) shifts bits into the lowest-order term.  In our   */
 267 /* implementation, that means shifting towards the right.  Why do we   */
 268 /* do it this way?  Because the calculated CRC must be transmitted in  */
 269 /* order from highest-order term to lowest-order term.  UARTs transmit */
 270 /* characters in order from LSB to MSB.  By storing the CRC this way,  */
 271 /* we hand it to the UART in the order low-byte to high-byte; the UART */
 272 /* sends each low-bit to hight-bit; and the result is transmission bit */
 273 /* by bit from highest- to lowest-order term without requiring any bit */
 274 /* shuffling on our part.  Reception works similarly.                  */
 275
 276 /* The feedback terms table consists of 256, 32-bit entries.  Notes:   */
 277 /*                                                                     */
 278 /*  1. The table can be generated at runtime if desired; code to do so */
 279 /*     is shown later.  It might not be obvious, but the feedback      */
 280 /*     terms simply represent the results of eight shift/xor opera-    */
 281 /*     tions for all combinations of data and CRC register values.     */
 282 /*                                                                     */
 283 /*  2. The CRC accumulation logic is the same for all CRC polynomials, */
 284 /*     be they sixteen or thirty-two bits wide.  You simply choose the */
 285 /*     appropriate table.  Alternatively, because the table can be     */
 286 /*     generated at runtime, you can start by generating the table for */
 287 /*     the polynomial in question and use exactly the same "updcrc",   */
 288 /*     if your application needn't simultaneously handle two CRC       */
 289 /*     polynomials.  (Note, however, that XMODEM is strange.)          */
 290 /*                                                                     */
 291 /*  3. For 16-bit CRCs, the table entries need be only 16 bits wide;   */
 292 /*     of course, 32-bit entries work OK if the high 16 bits are zero. */
 293 /*                                                                     */
 294 /*  4. The values must be right-shifted by eight bits by the "updcrc"  */
 295 /*     logic; the shift must be unsigned (bring in zeroes).  On some   */
 296 /*     hardware you could probably optimize the shift in assembler by  */
 297 /*     using byte-swap instructions.                                   */
 298
 299 static const uint32_t crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
 300 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
 301 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
 302 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
 303 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
 304 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
 305 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
 306 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
 307 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
 308 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
 309 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
 310 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
 311 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
 312 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
 313 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
 314 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
 315 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
 316 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
 317 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
 318 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
 319 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
 320 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
 321 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
 322 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
 323 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
 324 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
 325 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
 326 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
 327 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
 328 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
 329 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
 330 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
 331 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
 332 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
 333 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
 334 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
 335 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
 336 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
 337 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
 338 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
 339 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
 340 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
 341 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
 342 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 343 };
 344
 345 #define UPDC32(octet,crc) (crc_32_tab[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
 346
 347 uint32_t crc32buf(char *buf, size_t len)
 348 {
 349       uint32_t crc;
 350
 351       crc = 0xFFFFFFFF;
 352
 353       for ( ; len; --len, ++buf)
 354       {
 355             crc = UPDC32(*buf, crc);
 356       }
 357
 358       return crc;
 359 }