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>
diff --git a/tools/envcrc.c b/tools/envcrc.c
index 4334cdf..5b0f7cd 100644
--- a/tools/envcrc.c
+++ b/tools/envcrc.c
@@ -24,6 +24,7 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
#ifndef __ASSEMBLY__
@@ -77,19 +78,56 @@
int main (int argc, char **argv)
{
#ifdef ENV_IS_EMBEDDED
+ unsigned char pad = 0x00;
uint32_t crc;
unsigned char *envptr = &environment,
*dataptr = envptr + ENV_HEADER_SIZE;
unsigned int datasize = ENV_SIZE;
+ unsigned int eoe;
+
+ if (argv[1] && !strncmp(argv[1], "--binary", 8)) {
+ int ipad = 0xff;
+ if (argv[1][8] == '=')
+ sscanf(argv[1] + 9, "%i", &ipad);
+ pad = ipad;
+ }
+
+ if (pad) {
+ /* find the end of env */
+ for (eoe = 0; eoe < datasize - 1; ++eoe)
+ if (!dataptr[eoe] && !dataptr[eoe+1]) {
+ eoe += 2;
+ break;
+ }
+ if (eoe < datasize - 1)
+ memset(dataptr + eoe, pad, datasize - eoe);
+ }
crc = crc32 (0, dataptr, datasize);
/* Check if verbose mode is activated passing a parameter to the program */
if (argc > 1) {
- printf ("CRC32 from offset %08X to %08X of environment = %08X\n",
- (unsigned int) (dataptr - envptr),
- (unsigned int) (dataptr - envptr) + datasize,
- crc);
+ if (!strncmp(argv[1], "--binary", 8)) {
+ int le = (argc > 2 ? !strcmp(argv[2], "le") : 1);
+ size_t i, start, end, step;
+ if (le) {
+ start = 0;
+ end = ENV_HEADER_SIZE;
+ step = 1;
+ } else {
+ start = ENV_HEADER_SIZE - 1;
+ end = -1;
+ step = -1;
+ }
+ for (i = start; i != end; i += step)
+ printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
+ fwrite(dataptr, 1, datasize, stdout);
+ } else {
+ printf("CRC32 from offset %08X to %08X of environment = %08X\n",
+ (unsigned int) (dataptr - envptr),
+ (unsigned int) (dataptr - envptr) + datasize,
+ crc);
+ }
} else {
printf ("0x%08X\n", crc);
}