tools/envcrc: add --binary option to export embedded env
The --binary option to envcrc can be used to export the embedded env as a binary blob so that it can be manipulated/examined/whatever externally. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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@ -24,6 +24,7 @@
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#include <stdio.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <unistd.h>
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#ifndef __ASSEMBLY__
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#ifndef __ASSEMBLY__
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@ -77,19 +78,56 @@ extern unsigned char environment;
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int main (int argc, char **argv)
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int main (int argc, char **argv)
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{
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{
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#ifdef ENV_IS_EMBEDDED
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#ifdef ENV_IS_EMBEDDED
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unsigned char pad = 0x00;
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uint32_t crc;
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uint32_t crc;
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unsigned char *envptr = &environment,
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unsigned char *envptr = &environment,
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*dataptr = envptr + ENV_HEADER_SIZE;
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*dataptr = envptr + ENV_HEADER_SIZE;
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unsigned int datasize = ENV_SIZE;
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unsigned int datasize = ENV_SIZE;
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unsigned int eoe;
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if (argv[1] && !strncmp(argv[1], "--binary", 8)) {
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int ipad = 0xff;
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if (argv[1][8] == '=')
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sscanf(argv[1] + 9, "%i", &ipad);
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pad = ipad;
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}
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if (pad) {
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/* find the end of env */
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for (eoe = 0; eoe < datasize - 1; ++eoe)
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if (!dataptr[eoe] && !dataptr[eoe+1]) {
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eoe += 2;
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break;
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}
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if (eoe < datasize - 1)
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memset(dataptr + eoe, pad, datasize - eoe);
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}
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crc = crc32 (0, dataptr, datasize);
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crc = crc32 (0, dataptr, datasize);
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/* Check if verbose mode is activated passing a parameter to the program */
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/* Check if verbose mode is activated passing a parameter to the program */
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if (argc > 1) {
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if (argc > 1) {
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printf ("CRC32 from offset %08X to %08X of environment = %08X\n",
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if (!strncmp(argv[1], "--binary", 8)) {
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(unsigned int) (dataptr - envptr),
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int le = (argc > 2 ? !strcmp(argv[2], "le") : 1);
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(unsigned int) (dataptr - envptr) + datasize,
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size_t i, start, end, step;
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crc);
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if (le) {
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start = 0;
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end = ENV_HEADER_SIZE;
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step = 1;
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} else {
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start = ENV_HEADER_SIZE - 1;
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end = -1;
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step = -1;
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}
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for (i = start; i != end; i += step)
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printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
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fwrite(dataptr, 1, datasize, stdout);
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} else {
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printf("CRC32 from offset %08X to %08X of environment = %08X\n",
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(unsigned int) (dataptr - envptr),
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(unsigned int) (dataptr - envptr) + datasize,
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crc);
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}
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} else {
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} else {
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printf ("0x%08X\n", crc);
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printf ("0x%08X\n", crc);
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}
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}
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