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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>
This commit is contained in:
Mike Frysinger 2009-05-06 08:41:45 -04:00 committed by Wolfgang Denk
parent 18cc7afd9a
commit 837db3d87f
1 changed files with 42 additions and 4 deletions
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46
tools/envcrc.c
View File

@ -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 @@ extern unsigned char environment;
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);
}