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otrx: support for extracting partitions 

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45390 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Rafał Miłecki 2015-04-12 11:46:11 +00:00
parent f1e93b5907
commit 99ad5c9c91
1 changed files with 127 additions and 1 deletions
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128
package/utils/otrx/src/otrx.c
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@ -27,6 +27,7 @@
#define TRX_MAGIC 0x30524448
#define TRX_FLAGS_OFFSET 12
#define TRX_MAX_PARTS 3
struct trx_header {
uint32_t magic;
@ -40,12 +41,14 @@ struct trx_header {
enum mode {
MODE_UNKNOWN,
MODE_CHECK,
MODE_EXTRACT,
};
enum mode mode = MODE_UNKNOWN;
char *trx_path;
size_t trx_offset = 0;
char *partition[TRX_MAX_PARTS] = {};
/**************************************************
* CRC32
@ -195,6 +198,107 @@ out:
return err;
}
/**************************************************
* Extract
**************************************************/
static int otrx_extract_copy(FILE *trx, size_t offset, size_t length, char *out_path) {
FILE *out;
size_t bytes;
uint8_t *buf;
int err = 0;
out = fopen(out_path, "w");
if (!out) {
fprintf(stderr, "Couldn't open %s\n", out_path);
err = -EACCES;
goto out;
}
buf = malloc(length);
if (!buf) {
fprintf(stderr, "Couldn't alloc %zu B buffer\n", length);
err = -ENOMEM;
goto err_close;
}
fseek(trx, offset, SEEK_SET);
bytes = fread(buf, 1, length, trx);
if (bytes != length) {
fprintf(stderr, "Couldn't read %zu B of data from %s\n", length, trx_path);
err = -ENOMEM;
goto err_free_buf;
};
bytes = fwrite(buf, 1, length, out);
if (bytes != length) {
fprintf(stderr, "Couldn't write %zu B to %s\n", length, out_path);
err = -ENOMEM;
goto err_free_buf;
}
printf("Extracted 0x%zx bytes into %s\n", length, out_path);
err_free_buf:
free(buf);
err_close:
fclose(out);
out:
return err;
}
static int otrx_extract() {
FILE *trx;
struct trx_header hdr;
size_t bytes;
int i;
int err = 0;
trx = fopen(trx_path, "r");
if (!trx) {
fprintf(stderr, "Couldn't open %s\n", trx_path);
err = -EACCES;
goto out;
}
fseek(trx, trx_offset, SEEK_SET);
bytes = fread(&hdr, 1, sizeof(hdr), trx);
if (bytes != sizeof(hdr)) {
fprintf(stderr, "Couldn't read %s header\n", trx_path);
err = -EIO;
goto err_close;
}
if (le32_to_cpu(hdr.magic) != TRX_MAGIC) {
fprintf(stderr, "Invalid TRX magic: 0x%08x\n", le32_to_cpu(hdr.magic));
err = -EINVAL;
goto err_close;
}
for (i = 0; i < TRX_MAX_PARTS; i++) {
size_t length;
if (!partition[i])
continue;
if (!hdr.offset[i]) {
printf("TRX doesn't contain partition %d, can't extract %s\n", i + 1, partition[i]);
continue;
}
if (i + 1 >= TRX_MAX_PARTS || !hdr.offset[i + 1])
length = le32_to_cpu(hdr.length) - le32_to_cpu(hdr.offset[i]);
else
length = le32_to_cpu(hdr.offset[i + 1]) - le32_to_cpu(hdr.offset[i]);
otrx_extract_copy(trx, trx_offset + le32_to_cpu(hdr.offset[i]), length, partition[i]);
}
err_close:
fclose(trx);
out:
return err;
}
/**************************************************
* Start
**************************************************/
@ -202,15 +306,28 @@ out:
static void parse_options(int argc, char **argv) {
int c;
while ((c = getopt(argc, argv, "c:o:")) != -1) {
while ((c = getopt(argc, argv, "c:e:o:1:2:3:")) != -1) {
switch (c) {
case 'c':
mode = MODE_CHECK;
trx_path = optarg;
break;
case 'e':
mode = MODE_EXTRACT;
trx_path = optarg;
break;
case 'o':
trx_offset = atoi(optarg);
break;
case '1':
partition[0] = optarg;
break;
case '2':
partition[1] = optarg;
break;
case '3':
partition[2] = optarg;
break;
}
}
}
@ -221,6 +338,13 @@ static void usage() {
printf("Checking TRX file:\n");
printf("\t-c file\t\tcheck if file is a valid TRX\n");
printf("\t-o offset\toffset of TRX data in file (default: 0)\n");
printf("\n");
printf("Extracting from TRX file:\n");
printf("\t-e file\t\tfile with TRX to extract from\n");
printf("\t-o offset\toffset of TRX data in file (default: 0)\n");
printf("\t-1 file\t\tfile to extract 1st partition to (optional)\n");
printf("\t-2 file\t\tfile to extract 2nd partition to (optional)\n");
printf("\t-3 file\t\tfile to extract 3rd partition to (optional)\n");
}
int main(int argc, char **argv) {
@ -229,6 +353,8 @@ int main(int argc, char **argv) {
switch (mode) {
case MODE_CHECK:
return otrx_check();
case MODE_EXTRACT:
return otrx_extract();
default:
usage();
}