Skip to content
Permalink
Browse files

firmware-utils: add hex pattern mode for xorimage

This commit adds "hex pattern mode" to xorimage. This mode allows xor
with a hexadecimal pattern that cannot be expressed with ASCII
charactors.

usage (example):
  xorimage -i firmware.bin -o firmware.bin.new -p 6A57190601121E4C -x

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> (fix checkpatch)
  • Loading branch information...
musashino205 authored and chunkeey committed Dec 8, 2018
1 parent 10a54e1 commit 9145f5209fc33a019a652ce87832f48fa50aefc8
Showing with 36 additions and 3 deletions.
  1. +36 −3 tools/firmware-utils/src/xorimage.c
@@ -20,11 +20,13 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>

static char default_pattern[] = "12345678";
static int is_hex_pattern;


int xor_data(uint8_t *data, size_t len, const uint8_t *pattern, int p_len, int p_off)
@@ -43,7 +45,7 @@ void usage(void) __attribute__ (( __noreturn__ ));

void usage(void)
{
fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>]\n");
fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>] [-x]\n");
exit(EXIT_FAILURE);
}

@@ -56,12 +58,14 @@ int main(int argc, char **argv)
char *ifn = NULL;
char *ofn = NULL;
const char *pattern = default_pattern;
char hex_pattern[128];
unsigned int hex_buf;
int c;
int v0, v1, v2;
size_t n;
int p_len, p_off = 0;

while ((c = getopt(argc, argv, "i:o:p:h")) != -1) {
while ((c = getopt(argc, argv, "i:o:p:xh")) != -1) {
switch (c) {
case 'i':
ifn = optarg;
@@ -72,6 +76,9 @@ int main(int argc, char **argv)
case 'p':
pattern = optarg;
break;
case 'x':
is_hex_pattern = true;
break;
case 'h':
default:
usage();
@@ -100,6 +107,27 @@ int main(int argc, char **argv)
usage();
}

if (is_hex_pattern) {
int i;

if ((p_len / 2) > sizeof(hex_pattern)) {
fprintf(stderr, "provided hex pattern is too long\n");
usage();
}

if (p_len % 2 != 0) {
fprintf(stderr, "the number of characters (hex) is incorrect\n");
usage();
}

for (i = 0; i < (p_len / 2); i++) {
if (sscanf(pattern + (i * 2), "%2x", &hex_buf) < 0) {
fprintf(stderr, "invalid hex digit around %d\n", i * 2);
usage();
}
hex_pattern[i] = (char)hex_buf;
}
}

while ((n = fread(buf, 1, sizeof(buf), in)) > 0) {
if (n < sizeof(buf)) {
@@ -110,7 +138,12 @@ int main(int argc, char **argv)
}
}

p_off = xor_data(buf, n, pattern, p_len, p_off);
if (is_hex_pattern) {
p_off = xor_data(buf, n, hex_pattern, (p_len / 2),
p_off);
} else {
p_off = xor_data(buf, n, pattern, p_len, p_off);
}

if (!fwrite(buf, n, 1, out)) {
FWRITE_ERROR:

0 comments on commit 9145f52

Please sign in to comment.
You can’t perform that action at this time.