/branches/18.06.1/tools/firmware-utils/src/xorimage.c |
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/* |
* xorimage.c - partially based on OpenWrt's addpattern.c |
* |
* This program is free software; you can redistribute it and/or modify |
* it under the terms of the GNU General Public License as published by |
* the Free Software Foundation; either version 2 of the License, or |
* (at your option) any later version. |
* |
* This program is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* General Public License for more details. |
* |
* You should have received a copy of the GNU General Public License |
* along with this program; if not, write to the Free Software |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
*/ |
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|
#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; |
|
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int xor_data(uint8_t *data, size_t len, const uint8_t *pattern, int p_len, int p_off) |
{ |
int offset = p_off; |
while (len--) { |
*data ^= pattern[offset]; |
data++; |
offset = (offset + 1) % p_len; |
} |
return offset; |
} |
|
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void usage(void) __attribute__ (( __noreturn__ )); |
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void usage(void) |
{ |
fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>] [-x]\n"); |
exit(EXIT_FAILURE); |
} |
|
|
int main(int argc, char **argv) |
{ |
char buf[1024]; /* keep this at 1k or adjust garbage calc below */ |
FILE *in = stdin; |
FILE *out = stdout; |
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:xh")) != -1) { |
switch (c) { |
case 'i': |
ifn = optarg; |
break; |
case 'o': |
ofn = optarg; |
break; |
case 'p': |
pattern = optarg; |
break; |
case 'x': |
is_hex_pattern = true; |
break; |
case 'h': |
default: |
usage(); |
} |
} |
|
if (optind != argc || optind == 1) { |
fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]); |
usage(); |
} |
|
if (ifn && !(in = fopen(ifn, "r"))) { |
fprintf(stderr, "can not open \"%s\" for reading\n", ifn); |
usage(); |
} |
|
if (ofn && !(out = fopen(ofn, "w"))) { |
fprintf(stderr, "can not open \"%s\" for writing\n", ofn); |
usage(); |
} |
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p_len = strlen(pattern); |
|
if (p_len == 0) { |
fprintf(stderr, "pattern cannot be empty\n"); |
usage(); |
} |
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if (is_hex_pattern) { |
int i; |
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if ((p_len / 2) > sizeof(hex_pattern)) { |
fprintf(stderr, "provided hex pattern is too long\n"); |
usage(); |
} |
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if (p_len % 2 != 0) { |
fprintf(stderr, "the number of characters (hex) is incorrect\n"); |
usage(); |
} |
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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)) { |
if (ferror(in)) { |
FREAD_ERROR: |
fprintf(stderr, "fread error\n"); |
return EXIT_FAILURE; |
} |
} |
|
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); |
} |
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if (!fwrite(buf, n, 1, out)) { |
FWRITE_ERROR: |
fprintf(stderr, "fwrite error\n"); |
return EXIT_FAILURE; |
} |
} |
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if (ferror(in)) { |
goto FREAD_ERROR; |
} |
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if (fflush(out)) { |
goto FWRITE_ERROR; |
} |
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fclose(in); |
fclose(out); |
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return EXIT_SUCCESS; |
} |