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/*
* asustrx
*
* Copyright (C) 2015 Rafał Miłecki <zajec5@gmail.com>
*
* 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.
*/
#include <byteswap.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le32(x) bswap_32(x)
#define le32_to_cpu(x) bswap_32(x)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define cpu_to_le32(x) (x)
#define le32_to_cpu(x) (x)
#else
#error "Unsupported endianness"
#endif
#define TRX_MAGIC 0x30524448
#define TRX_FLAGS_OFFSET 12
struct trx_header {
uint32_t magic;
uint32_t length;
uint32_t crc32;
uint16_t flags;
uint16_t version;
uint32_t offset[3];
};
struct asustrx_tail {
uint8_t version[4];
char productid[12];
uint8_t unused[48];
};
char *in_path = NULL;
char *out_path = NULL;
char *productid = NULL;
uint8_t version[4] = { };
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static const uint32_t crc32_tbl[] = {
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,
};
static void parse_options(int argc, char **argv) {
int c;
while ((c = getopt(argc, argv, "i:o:p:v:")) != -1) {
switch (c) {
case 'i':
in_path = optarg;
break;
case 'o':
out_path = optarg;
break;
case 'p':
productid = optarg;
break;
case 'v':
if (sscanf(optarg, "%hu.%hu.%hu.%hu", &version[0], &version[1], &version[2], &version[3]) != 4)
fprintf(stderr, "Version %s doesn't match suppored 4-digits format\n", optarg);
break;
}
}
}
static void usage() {
printf("Usage:\n");
printf("\t-i file\t\t\t\tinput TRX file\n");
printf("\t-o file\t\t\t\toutput Asus TRX file\n");
printf("\t-p productid\t\t\tproduct (device) ID\n");
printf("\t-v version\t\t\tfirmware version formatted with 4 digits like: 1.2.3.4\n");
}
int main(int argc, char **argv) {
struct trx_header hdr;
struct asustrx_tail tail = { };
FILE *in, *out;
uint8_t buf[1024];
size_t bytes;
size_t length = 0;
uint32_t crc32 = 0xffffffff;
int i;
int err = 0;
/* Parse & validate arguments */
parse_options(argc, argv);
if (!in_path || !out_path || !productid) {
usage();
err = -EINVAL;
goto err;
}
/* Fill Asus tail */
tail.version[0] = version[0];
tail.version[1] = version[1];
tail.version[2] = version[2];
tail.version[3] = version[3];
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strncpy(tail.productid, productid, sizeof(tail.productid));
/* Open files */
in = fopen(in_path, "r");
if (!in) {
fprintf(stderr, "Couldn't open %s\n", in_path);
err = -EIO;
goto err;
}
out = fopen(out_path, "w+");
if (!out) {
fprintf(stderr, "Couldn't open %s\n", out_path);
err = -EIO;
goto err;
}
/* Check is there is empty place for Asus tail */
bytes = sizeof(struct asustrx_tail);
fseek(in, -bytes, SEEK_END);
if (fread(buf, 1, bytes, in) != bytes) {
fprintf(stderr, "Couldn't read %zu B from %s\n", bytes, in_path);
err = -EIO;
goto err;
}
for (i = 0; i < bytes; i++) {
if (buf[i]) {
fprintf(stderr, "Input TRX doesn't have last 64 B empty %s\n", out_path);
err = -ENOSPC;
goto err;
}
}
/* Copy whole TRX */
rewind(in);
while ((bytes = fread(buf, 1, sizeof(buf), in)) > 0) {
if (fwrite(buf, 1, bytes, out) != bytes) {
fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, out_path);
err = -EIO;
goto err;
}
}
/* Overwrite last 64 B with Asus tail */
bytes = sizeof(tail);
fseek(out, -bytes, SEEK_CUR);
if (fwrite(&tail, 1, bytes, out) != bytes) {
fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, out_path);
err = -EIO;
goto err;
}
/* Calculate crc32 */
fseek(out, TRX_FLAGS_OFFSET, SEEK_SET);
length = TRX_FLAGS_OFFSET;
while ((bytes = fread(buf, 1, sizeof(buf), out )) > 0) {
length += bytes;
for (i = 0; i < bytes; i++)
crc32 = crc32_tbl[(crc32 ^ buf[i]) & 0xff] ^ (crc32 >> 8);
}
/* Update header */
bytes = sizeof(hdr);
rewind(out);
if (fread(&hdr, 1, sizeof(hdr), out) != bytes) {
fprintf(stderr, "Couldn't read %zu B from %s\n", bytes, in_path);
err = -EIO;
goto err;
}
hdr.crc32 = cpu_to_le32(crc32);
rewind(out);
if (fwrite(&hdr, 1, bytes, out) != bytes) {
fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, out_path);