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/*
* Stand-alone tool to access the Puzzles obfuscation algorithm.
*
* To deobfuscate, use "obfusc -d":
*
* obfusc -d reads binary data from stdin, writes to stdout
* obfusc -d <hex string> works on the given hex string instead of stdin
* obfusc -d -h writes a hex string instead of binary to stdout
*
* To obfuscate, "obfusc -e":
*
* obfusc -e reads binary from stdin, writes hex to stdout
* obfusc -e <hex string> works on the given hex string instead of stdin
* obfusc -e -b writes binary instead of text to stdout
*
* The default output format is hex for -e and binary for -d
* because that's the way obfuscation is generally used in
* Puzzles. Either of -b and -h can always be specified to set it
* explicitly.
*
* Data read from standard input is assumed always to be binary;
* data provided on the command line is taken to be hex.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include "puzzles.h"
int main(int argc, char **argv)
{
enum { BINARY, DEFAULT, HEX } outputmode = DEFAULT;
char *inhex = NULL;
unsigned char *data;
int datalen;
int decode = -1;
int doing_opts = TRUE;
while (--argc > 0) {
char *p = *++argv;
if (doing_opts && *p == '-') {
if (!strcmp(p, "--")) {
doing_opts = 0;
continue;
}
p++;
while (*p) {
switch (*p) {
case 'e':
decode = 0;
break;
case 'd':
decode = 1;
break;
case 'b':
outputmode = BINARY;
break;
case 'h':
outputmode = HEX;
break;
default:
fprintf(stderr, "obfusc: unrecognised option '-%c'\n",
*p);
return 1;
}
p++;
}
} else {
if (!inhex) {
inhex = p;
} else {
fprintf(stderr, "obfusc: expected at most one argument\n");
return 1;
}
}
}
if (decode < 0) {
fprintf(stderr, "usage: obfusc < -e | -d > [ -b | -h ] [hex data]\n");
return 0;
}
if (outputmode == DEFAULT)
outputmode = (decode ? BINARY : HEX);
if (inhex) {
datalen = strlen(inhex) / 2;
data = hex2bin(inhex, datalen);
} else {
int datasize = 4096;
datalen = 0;
data = snewn(datasize, unsigned char);
while (1) {
int ret = fread(data + datalen, 1, datasize - datalen, stdin);
if (ret < 0) {
fprintf(stderr, "obfusc: read: %s\n", strerror(errno));
return 1;
} else if (ret == 0) {
break;
} else {
datalen += ret;
if (datasize - datalen < 4096) {
datasize = datalen * 5 / 4 + 4096;
data = sresize(data, datasize, unsigned char);
}
}
}
}
obfuscate_bitmap(data, datalen * 8, decode);
if (outputmode == BINARY) {
int ret = fwrite(data, 1, datalen, stdout);
if (ret < 0) {
fprintf(stderr, "obfusc: write: %s\n", strerror(errno));
return 1;
}
} else {
int i;
for (i = 0; i < datalen; i++)
printf("%02x", data[i]);
printf("\n");
}
return 0;
}
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