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 * March 24, 2010 - markus
40 *
41 * extend trx header struct for new version
42 * assume v1 for as default
43 * Add option -2 to allow v2 header
44 */
45
46#include <stdio.h>
47#include <stdlib.h>
48#include <stddef.h>
49#include <stdint.h>
50#include <string.h>
51#include <errno.h>
52#include <unistd.h>
53
54#if __BYTE_ORDER == __BIG_ENDIAN
55#define STORE32_LE(X)		bswap_32(X)
56#define LOAD32_LE(X)		bswap_32(X)
57#elif __BYTE_ORDER == __LITTLE_ENDIAN
58#define STORE32_LE(X)		(X)
59#define LOAD32_LE(X)		(X)
60#else
61#error unkown endianness!
62#endif
63
64uint32_t crc32buf(char *buf, size_t len);
65
66/**********************************************************************/
67/* from trxhdr.h */
68
69#define TRX_MAGIC	0x30524448	/* "HDR0" */
70#define TRX_MAX_LEN	0x720000
71#define TRX_NO_HEADER	1		/* Do not write TRX header */
72
73struct trx_header {
74	uint32_t magic;			/* "HDR0" */
75	uint32_t len;			/* Length of file including header */
76	uint32_t crc32;			/* 32-bit CRC from flag_version to end of file */
77	uint32_t flag_version;	/* 0:15 flags, 16:31 version */
78	uint32_t offsets[4];	/* Offsets of partitions from start of header */
79};
80
81/**********************************************************************/
82
83void usage(void) __attribute__ (( __noreturn__ ));
84
85void usage(void)
86{
87	fprintf(stderr, "Usage:\n");
88	fprintf(stderr, " trx [-2] [-o outfile] [-m maxlen] [-a align] [-b absolute offset] [-x relative offset]\n");
89	fprintf(stderr, "     [-f file] [-f file [-f file [-f file (v2 only)]]]\n");
90	exit(EXIT_FAILURE);
91}
92
93int main(int argc, char **argv)
94{
95	FILE *out = stdout;
96	FILE *in;
97	char *ofn = NULL;
98	char *buf;
99	char *e;
100	int c, i, append = 0;
101	size_t n;
102	ssize_t n2;
103	uint32_t cur_len, fsmark=0;
104	unsigned long maxlen = TRX_MAX_LEN;
105	struct trx_header *p;
106	char trx_version = 1;
107	unsigned char binheader[32];
108
109	fprintf(stderr, "mjn3's trx replacement - v0.81.1\n");
110
111	if (!(buf = malloc(maxlen))) {
112		fprintf(stderr, "malloc failed\n");
113		return EXIT_FAILURE;
114	}
115
116	p = (struct trx_header *) buf;
117
118	p->magic = STORE32_LE(TRX_MAGIC);
119	cur_len = sizeof(struct trx_header) - 4; /* assume v1 header */
120
121	in = NULL;
122	i = 0;
123
124	while ((c = getopt(argc, argv, "-:2o:m:a:x:b:f:A:F:")) != -1) {
125		switch (c) {
126			case '2':
127				/* take care that nothing was written to buf so far */
128				if (cur_len != sizeof(struct trx_header) - 4) {
129					fprintf(stderr, "-2 has to be used before any other argument!\n");
130				}
131				else {
132					trx_version = 2;
133					cur_len += 4;
134				}
135				break;
136			case 'F':
137				fsmark = cur_len;
138			case 'A':
139				append = 1;
140				/* fall through */
141			case 'f':
142			case 1:
143				if (!append)
144					p->offsets[i++] = STORE32_LE(cur_len);
145
146				if (!(in = fopen(optarg, "r"))) {
147					fprintf(stderr, "can not open \"%s\" for reading\n", optarg);
148					usage();
149				}
150				n = fread(buf + cur_len, 1, maxlen - cur_len, in);
151				if (!feof(in)) {
152					fprintf(stderr, "fread failure or file \"%s\" too large\n",optarg);
153					fclose(in);
154					return EXIT_FAILURE;
155				}
156				fclose(in);
157#undef  ROUND
158#define ROUND 4
159				if (n & (ROUND-1)) {
160					memset(buf + cur_len + n, 0, ROUND - (n & (ROUND-1)));
161					n += ROUND - (n & (ROUND-1));
162				}
163				cur_len += n;
164				append = 0;
165
166				break;
167			case 'o':
168				ofn = optarg;
169				if (ofn && !(out = fopen(ofn, "w"))) {
170					fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
171					usage();
172				}
173
174				break;
175			case 'm':
176				errno = 0;
177				maxlen = strtoul(optarg, &e, 0);
178				if (errno || (e == optarg) || *e) {
179					fprintf(stderr, "illegal numeric string\n");
180					usage();
181				}
182#undef  ROUND
183#define ROUND 0x1000
184				if (maxlen & (ROUND-1)) {
185					maxlen += (ROUND - (maxlen & (ROUND-1)));
186				}
187				if (maxlen < ROUND) {
188					fprintf(stderr, "maxlen too small (or wrapped)\n");
189					usage();
190				}
191				if (maxlen > TRX_MAX_LEN) {
192					fprintf(stderr, "WARNING: maxlen exceeds default maximum!  Beware of overwriting nvram!\n");
193				}
194				if (!(buf = realloc(buf,maxlen))) {
195					fprintf(stderr, "realloc failed");
196					return EXIT_FAILURE;
197				}
198				p = (struct trx_header *) buf;
199				break;
200			case 'a':
201				errno = 0;
202				n = strtoul(optarg, &e, 0);
203				if (errno || (e == optarg) || *e) {
204					fprintf(stderr, "illegal numeric string\n");
205					usage();
206				}
207				if (cur_len & (n-1)) {
208					n = n - (cur_len & (n-1));
209					memset(buf + cur_len, 0, n);
210					cur_len += n;
211				}
212				break;
213			case 'b':
214				errno = 0;
215				n = strtoul(optarg, &e, 0);
216				if (errno || (e == optarg) || *e) {
217					fprintf(stderr, "illegal numeric string\n");
218					usage();
219				}
220				if (n < cur_len) {
221					fprintf(stderr, "WARNING: current length exceeds -b %d offset\n",(int) n);
222				} else {
223					memset(buf + cur_len, 0, n - cur_len);
224					cur_len = n;
225				}
226				break;
227			case 'x':
228				errno = 0;
229				n2 = strtol(optarg, &e, 0);
230				if (errno || (e == optarg) || *e) {
231					fprintf(stderr, "illegal numeric string\n");
232					usage();
233				}
234				if (n2 < 0) {
235					if (-n2 > cur_len) {
236						fprintf(stderr, "WARNING: current length smaller then -x %d offset\n",(int) n2);
237						cur_len = 0;
238					} else
239						cur_len += n2;
240				} else {
241					memset(buf + cur_len, 0, n2);
242					cur_len += n2;
243				}
244
245				break;
246			default:
247				usage();
248		}
249	}
250	p->flag_version = STORE32_LE((trx_version << 16));
251
252	if (!in) {
253		fprintf(stderr, "we require atleast one filename\n");
254		usage();
255	}
256
257#undef  ROUND
258#define ROUND 0x1000
259	n = cur_len & (ROUND-1);
260	if (n) {
261		memset(buf + cur_len, 0, ROUND - n);
262		cur_len += ROUND - n;
263	}
264
265	/* for TRXv2 set bin-header Flags to 0xFF for CRC calculation like CFE does */
266	if (trx_version == 2) {
267		if(cur_len - LOAD32_LE(p->offsets[3]) < sizeof(binheader)) {
268			fprintf(stderr, "TRXv2 binheader too small!\n");
269			return EXIT_FAILURE;
270		}
271		memcpy(binheader, buf + LOAD32_LE(p->offsets[3]), sizeof(binheader)); /* save header */
272		memset(buf + LOAD32_LE(p->offsets[3]) + 22, 0xFF, 8); /* set stable and try1-3 to 0xFF */
273	}
274
275	p->crc32 = crc32buf((char *) &p->flag_version,
276						((fsmark)?fsmark:cur_len) - offsetof(struct trx_header, flag_version));
277	p->crc32 = STORE32_LE(p->crc32);
278
279	p->len = STORE32_LE((fsmark) ? fsmark : cur_len);
280
281	/* restore TRXv2 bin-header */
282	if (trx_version == 2) {
283		memcpy(buf + LOAD32_LE(p->offsets[3]), binheader, sizeof(binheader));
284	}
285
286	if (!fwrite(buf, cur_len, 1, out) || fflush(out)) {
287		fprintf(stderr, "fwrite failed\n");
288		return EXIT_FAILURE;
289	}
290
291	fclose(out);
292
293	return EXIT_SUCCESS;
294}
295
296/**********************************************************************/
297/* The following was grabbed and tweaked from the old snippets collection
298 * of public domain C code. */
299
300/**********************************************************************\
301|* Demonstration program to compute the 32-bit CRC used as the frame  *|
302|* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71     *|
303|* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level     *|
304|* protocol).  The 32-bit FCS was added via the Federal Register,     *|
305|* 1 June 1982, p.23798.  I presume but don't know for certain that   *|
306|* this polynomial is or will be included in CCITT V.41, which        *|
307|* defines the 16-bit CRC (often called CRC-CCITT) polynomial.  FIPS  *|
308|* PUB 78 says that the 32-bit FCS reduces otherwise undetected       *|
309|* errors by a factor of 10^-5 over 16-bit FCS.                       *|
310\**********************************************************************/
311
312/* Copyright (C) 1986 Gary S. Brown.  You may use this program, or
313   code or tables extracted from it, as desired without restriction.*/
314
315/* First, the polynomial itself and its table of feedback terms.  The  */
316/* polynomial is                                                       */
317/* 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 */
318/* Note that we take it "backwards" and put the highest-order term in  */
319/* the lowest-order bit.  The X^32 term is "implied"; the LSB is the   */
320/* X^31 term, etc.  The X^0 term (usually shown as "+1") results in    */
321/* the MSB being 1.                                                    */
322
323/* Note that the usual hardware shift register implementation, which   */
324/* is what we're using (we're merely optimizing it by doing eight-bit  */
325/* chunks at a time) shifts bits into the lowest-order term.  In our   */
326/* implementation, that means shifting towards the right.  Why do we   */
327/* do it this way?  Because the calculated CRC must be transmitted in  */
328/* order from highest-order term to lowest-order term.  UARTs transmit */
329/* characters in order from LSB to MSB.  By storing the CRC this way,  */
330/* we hand it to the UART in the order low-byte to high-byte; the UART */
331/* sends each low-bit to hight-bit; and the result is transmission bit */
332/* by bit from highest- to lowest-order term without requiring any bit */
333/* shuffling on our part.  Reception works similarly.                  */
334
335/* The feedback terms table consists of 256, 32-bit entries.  Notes:   */
336/*                                                                     */
337/*  1. The table can be generated at runtime if desired; code to do so */
338/*     is shown later.  It might not be obvious, but the feedback      */
339/*     terms simply represent the results of eight shift/xor opera-    */
340/*     tions for all combinations of data and CRC register values.     */
341/*                                                                     */
342/*  2. The CRC accumulation logic is the same for all CRC polynomials, */
343/*     be they sixteen or thirty-two bits wide.  You simply choose the */
344/*     appropriate table.  Alternatively, because the table can be     */
345/*     generated at runtime, you can start by generating the table for */
346/*     the polynomial in question and use exactly the same "updcrc",   */
347/*     if your application needn't simultaneously handle two CRC       */
348/*     polynomials.  (Note, however, that XMODEM is strange.)          */
349/*                                                                     */
350/*  3. For 16-bit CRCs, the table entries need be only 16 bits wide;   */
351/*     of course, 32-bit entries work OK if the high 16 bits are zero. */
352/*                                                                     */
353/*  4. The values must be right-shifted by eight bits by the "updcrc"  */
354/*     logic; the shift must be unsigned (bring in zeroes).  On some   */
355/*     hardware you could probably optimize the shift in assembler by  */
356/*     using byte-swap instructions.                                   */
357
358static const uint32_t crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
3590x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
3600xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
3610x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
3620xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
3630x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
3640xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
3650x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
3660xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
3670x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
3680xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
3690x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
3700x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
3710x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
3720x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
3730x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
3740x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
3750x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
3760xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
3770x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
3780xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
3790x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
3800xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
3810xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
3820x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
3830xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
3840x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
3850xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
3860x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
3870xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
3880x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
3890xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
3900x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
3910x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
3920x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
3930x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
3940x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
3950x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
3960x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
3970xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
3980x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
3990xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
4000x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
4010xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
402};
403
404#define UPDC32(octet,crc) (crc_32_tab[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
405
406uint32_t crc32buf(char *buf, size_t len)
407{
408      uint32_t crc;
409
410      crc = 0xFFFFFFFF;
411
412      for ( ; len; --len, ++buf)
413      {
414            crc = UPDC32(*buf, crc);
415      }
416
417      return crc;
418}
419