ref: a45f1830cf4af0fbaf2fad448f717a6458b48b24
dir: /obfusc.c/
/* * 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; enum { UNKNOWN, DECODE, ENCODE } mode = UNKNOWN; bool 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': mode = ENCODE; break; case 'd': mode = DECODE; 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 (mode == UNKNOWN) { fprintf(stderr, "usage: obfusc < -e | -d > [ -b | -h ] [hex data]\n"); return 0; } if (outputmode == DEFAULT) outputmode = (mode == 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, mode == 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; }