summaryrefslogtreecommitdiff
path: root/target/utils/src/trx.c
blob: 787ffa894626ea2cac72c2261a8bda0ae9791a0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
/*
 * Copyright (C) 2004  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * 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
 */

/* July 29, 2004
 *
 * This is a hacked replacement for the 'trx' utility used to create
 * wrt54g .trx firmware files.  It isn't pretty, but it does the job
 * for me.
 *
 * As an extension, you can specify a larger maximum length for the
 * .trx file using '-m'.  It will be rounded up to be a multiple of 4K.
 * NOTE: This space will be malloc()'d.
 *
 * August 16, 2004
 *
 * Sigh... Make it endian-neutral.
 *
 * TODO: Support '-b' option to specify offsets for each file.
 *
 * February 19, 2005 - mbm
 *
 * Add -a (align offset) and -b (absolute offset)
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#if __BYTE_ORDER == __BIG_ENDIAN
#define STORE32_LE(X)		bswap_32(X)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define STORE32_LE(X)		(X)
#else
#error unkown endianness!
#endif

uint32_t crc32buf(char *buf, size_t len);

/**********************************************************************/
/* from trxhdr.h */

#define TRX_MAGIC	0x30524448	/* "HDR0" */
#define TRX_VERSION	1
#define TRX_MAX_LEN	0x5A0000
#define TRX_NO_HEADER	1		/* Do not write TRX header */	

struct trx_header {
	uint32_t magic;			/* "HDR0" */
	uint32_t len;			/* Length of file including header */
	uint32_t crc32;			/* 32-bit CRC from flag_version to end of file */
	uint32_t flag_version;	/* 0:15 flags, 16:31 version */
	uint32_t offsets[3];	/* Offsets of partitions from start of header */
};

/**********************************************************************/

void usage(void) __attribute__ (( __noreturn__ ));

void usage(void)
{
	fprintf(stderr, "Usage: trx [-o outfile] [-m maxlen] [-a align] [-b offset] [-f file] [-f file [-f file]]\n");
	exit(EXIT_FAILURE);
}

int main(int argc, char **argv)
{
	FILE *out = stdout;
	FILE *in;
	char *ofn = NULL;
	char *buf;
	char *e;
	int c, i;
	size_t n;
	uint32_t cur_len;
	unsigned long maxlen = TRX_MAX_LEN;
	struct trx_header *p;

	fprintf(stderr, "mjn3's trx replacement - v0.81.1\n");

	if (!(buf = malloc(maxlen))) {
		fprintf(stderr, "malloc failed\n");
		return EXIT_FAILURE;
	}

	p = (struct trx_header *) buf;

	p->magic = STORE32_LE(TRX_MAGIC);
	cur_len = sizeof(struct trx_header);
	p->flag_version = STORE32_LE((TRX_VERSION << 16));

	in = NULL;
	i = 0;

	while ((c = getopt(argc, argv, "-:o:m:a:b:f:")) != -1) {
		switch (c) {
			case 'f':
			case 1:
				p->offsets[i++] = STORE32_LE(cur_len);

				if (!(in = fopen(optarg, "r"))) {
					fprintf(stderr, "can not open \"%s\" for reading\n", optarg);
					usage();
				}
				n = fread(buf + cur_len, 1, maxlen - cur_len, in);
				if (!feof(in)) {
					fprintf(stderr, "fread failure or file \"%s\" too large\n",optarg);
					fclose(in);
					return EXIT_FAILURE;
				}
				fclose(in);
#undef  ROUND
#define ROUND 4
				if (n & (ROUND-1)) {
					memset(buf + cur_len + n, 0, ROUND - (n & (ROUND-1)));
					n += ROUND - (n & (ROUND-1));
				}
				cur_len += n;

				break;
			case 'o':
				ofn = optarg;
				if (ofn && !(out = fopen(ofn, "w"))) {
					fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
					usage();
				}

				break;
			case 'm':
				errno = 0;
				maxlen = strtoul(optarg, &e, 0);
				if (errno || (e == optarg) || *e) {
					fprintf(stderr, "illegal numeric string\n");
					usage();
				}
#undef  ROUND
#define ROUND 0x1000
				if (maxlen & (ROUND-1)) {
					maxlen += (ROUND - (maxlen & (ROUND-1)));
				}
				if (maxlen < ROUND) {
					fprintf(stderr, "maxlen too small (or wrapped)\n");
					usage();
				}
				if (maxlen > TRX_MAX_LEN) {
					fprintf(stderr, "WARNING: maxlen exceeds default maximum!  Beware of overwriting nvram!\n");
				}
				if (!(buf = realloc(buf,maxlen))) {
					fprintf(stderr, "realloc failed");
					return EXIT_FAILURE;
				}
				break;
			case 'a':
				errno = 0;
				n = strtoul(optarg, &e, 0);
				if (errno || (e == optarg) || *e) {
					fprintf(stderr, "illegal numeric string\n");
					usage();
				}
				if (cur_len & (n-1)) {
					n = n - (cur_len & (n-1));
					memset(buf + cur_len, 0, n);
					cur_len += n;
				}
				break;
			case 'b':
				errno = 0;
				n = strtoul(optarg, &e, 0);
				if (errno || (e == optarg) || *e) {
					fprintf(stderr, "illegal numeric string\n");
					usage();
				}
				if (n < cur_len) {
					fprintf(stderr, "WARNING: current length exceeds -b %d offset\n",n);
				} else {
					memset(buf + cur_len, 0, n - cur_len);
					cur_len = n;
				}
				break;
			default:
				usage();
		}
	}

	if (!in) {
		fprintf(stderr, "we require atleast one filename\n");
		usage();
	}

#undef  ROUND
#define ROUND 0x1000
	n = cur_len & (ROUND-1);
	if (n) {
		memset(buf + cur_len, 0, ROUND - n);
		cur_len += ROUND - n;
	}

	p->crc32 = crc32buf((char *) &p->flag_version,
						cur_len - offsetof(struct trx_header, flag_version));
	p->crc32 = STORE32_LE(p->crc32);

	p->len = STORE32_LE(cur_len);

	if (!fwrite(buf, cur_len, 1, out) || fflush(out)) {
		fprintf(stderr, "fwrite failed\n");
		return EXIT_FAILURE;
	}

	fclose(out);

	return EXIT_SUCCESS;
}

/**********************************************************************/
/* The following was grabbed and tweaked from the old snippets collection
 * of public domain C code. */

/**********************************************************************\
|* Demonstration program to compute the 32-bit CRC used as the frame  *|
|* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71     *|
|* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level     *|
|* protocol).  The 32-bit FCS was added via the Federal Register,     *|
|* 1 June 1982, p.23798.  I presume but don't know for certain that   *|
|* this polynomial is or will be included in CCITT V.41, which        *|
|* defines the 16-bit CRC (often called CRC-CCITT) polynomial.  FIPS  *|
|* PUB 78 says that the 32-bit FCS reduces otherwise undetected       *|
|* errors by a factor of 10^-5 over 16-bit FCS.                       *|
\**********************************************************************/

/* Copyright (C) 1986 Gary S. Brown.  You may use this program, or
   code or tables extracted from it, as desired without restriction.*/

/* First, the polynomial itself and its table of feedback terms.  The  */
/* polynomial is                                                       */
/* 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 */
/* Note that we take it "backwards" and put the highest-order term in  */
/* the lowest-order bit.  The X^32 term is "implied"; the LSB is the   */
/* X^31 term, etc.  The X^0 term (usually shown as "+1") results in    */
/* the MSB being 1.                                                    */

/* Note that the usual hardware shift register implementation, which   */
/* is what we're using (we're merely optimizing it by doing eight-bit  */
/* chunks at a time) shifts bits into the lowest-order term.  In our   */
/* implementation, that means shifting towards the right.  Why do we   */
/* do it this way?  Because the calculated CRC must be transmitted in  */
/* order from highest-order term to lowest-order term.  UARTs transmit */
/* characters in order from LSB to MSB.  By storing the CRC this way,  */
/* we hand it to the UART in the order low-byte to high-byte; the UART */
/* sends each low-bit to hight-bit; and the result is transmission bit */
/* by bit from highest- to lowest-order term without requiring any bit */
/* shuffling on our part.  Reception works similarly.                  */

/* The feedback terms table consists of 256, 32-bit entries.  Notes:   */
/*                                                                     */
/*  1. The table can be generated at runtime if desired; code to do so */
/*     is shown later.  It might not be obvious, but the feedback      */
/*     terms simply represent the results of eight shift/xor opera-    */
/*     tions for all combinations of data and CRC register values.     */
/*                                                                     */
/*  2. The CRC accumulation logic is the same for all CRC polynomials, */
/*     be they sixteen or thirty-two bits wide.  You simply choose the */
/*     appropriate table.  Alternatively, because the table can be     */
/*     generated at runtime, you can start by generating the table for */
/*     the polynomial in question and use exactly the same "updcrc",   */
/*     if your application needn't simultaneously handle two CRC       */
/*     polynomials.  (Note, however, that XMODEM is strange.)          */
/*                                                                     */
/*  3. For 16-bit CRCs, the table entries need be only 16 bits wide;   */
/*     of course, 32-bit entries work OK if the high 16 bits are zero. */
/*                                                                     */
/*  4. The values must be right-shifted by eight bits by the "updcrc"  */
/*     logic; the shift must be unsigned (bring in zeroes).  On some   */
/*     hardware you could probably optimize the shift in assembler by  */
/*     using byte-swap instructions.                                   */

static const uint32_t crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

#define UPDC32(octet,crc) (crc_32_tab[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))

uint32_t crc32buf(char *buf, size_t len)
{
      uint32_t crc;

      crc = 0xFFFFFFFF;

      for ( ; len; --len, ++buf)
      {
            crc = UPDC32(*buf, crc);
      }

      return crc;
}