mirror of
https://github.com/radareorg/radare2.git
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261 lines
6.6 KiB
C
261 lines
6.6 KiB
C
/*
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* ascii85 - Ascii85 encode/decode data and print to standard output
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*
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* Copyright (C) 2011 Remy Oukaour
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#define eprintf(args...) fprintf(stderr, args)
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#define USAGE_TEXT (\
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"usage: ascii85 [OPTION]... [FILE]\n"\
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"Enter 'ascii85 -h' for more information.\n")
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#define HELP_TEXT (\
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"NAME\n"\
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"\tascii85 - Ascii85 encode/decode data and print to standard output\n"\
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"\n"\
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"SYNOPSIS\n"\
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"\tascii85 [OPTION]... [FILE]\n"\
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"\n"\
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"DESCRIPTION\n"\
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"\tAscii85 encode or decode FILE, or standard input, to standard output.\n"\
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"\n"\
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"\t-d, --decode\n"\
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"\t\tdecode data (encodes by default)\n"\
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"\n"\
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"\t-i, --ignore-garbage\n"\
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"\t\twhen decoding, ignore invalid characters\n"\
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"\n"\
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"\t-n, --no-delims\n"\
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"\t\twhen encoding, omit delimiters (<~ and ~>), and when decoding,\n"\
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"\t\tdo not look for delimiters\n"\
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"\n"\
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"\t-w, --wrap=COLS\n"\
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"\t\twrap encoded lines after COLS characters (default 76). Use 0\n"\
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"\t\tto disable line wrapping.\n"\
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"\n"\
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"\t-y, --y-abbr\n"\
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"\t\tabbreviates four encoded spaces as 'y'\n"\
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"\n"\
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"\t-h, --help\n"\
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"\t\tdisplay this help and exit\n"\
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"\n"\
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"\tWith no FILE, or when FILE is -, read standard input.\n"\
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"\n"\
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"AUTHOR\n"\
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"\tWritten by Remy Oukaour <me@remyoukaour.com>.\n"\
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"\n"\
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"COPYRIGHT\n"\
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"\tCopyright (C) 2011 Remy Oukaour. MIT License.\n"\
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"\tThis is free software: you are free to change and redistribute it.\n"\
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"\tThere is NO WARRANTY, to the extent permitted by law.\n")
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int getc_nospace(FILE *f) {
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int c;
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while (isspace(c = getc(f)));
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return c;
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}
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void putc_wrap(char c, int wrap, int *len) {
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if (wrap && *len >= wrap) {
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putchar('\n');
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*len = 0;
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}
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putchar(c);
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(*len)++;
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}
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void encode_tuple(unsigned long tuple, int count, int wrap, int *plen, int y_abbr) {
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int i, lim;
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char out[5];
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if (tuple == 0 && count == 4) {
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putc_wrap('z', wrap, plen);
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}
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else if (tuple == 0x20202020 && count == 4 && y_abbr) {
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putc_wrap('y', wrap, plen);
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}
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else {
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for (i = 0; i < 5; i++) {
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out[i] = tuple % 85 + '!';
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tuple /= 85;
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}
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lim = 4 - count;
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for (i = 4; i >= lim; i--) {
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putc_wrap(out[i], wrap, plen);
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}
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}
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}
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void decode_tuple(unsigned long tuple, int count) {
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int i;
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for (i = 1; i < count; i++) {
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putchar(tuple >> ((4 - i) * 8));
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}
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}
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void ascii85_encode(FILE *fp, int delims, int wrap, int y_abbr) {
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int c, count = 0, len = 0;
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unsigned long tuple = 0;
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if (delims) {
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putc_wrap('<', wrap, &len);
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putc_wrap('~', wrap, &len);
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}
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for (;;) {
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c = getc(fp);
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if (c != EOF) {
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tuple |= c << ((3 - count++) * 8);
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if (count < 4) continue;
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}
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else if (count == 0) break;
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encode_tuple(tuple, count, wrap, &len, y_abbr);
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if (c == EOF) break;
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tuple = 0;
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count = 0;
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}
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if (delims) {
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putc_wrap('~', wrap, &len);
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putc_wrap('>', wrap, &len);
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}
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}
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void ascii85_decode(FILE *fp, int delims, int ignore_garbage) {
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int c, count = 0, end = 0;
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unsigned long tuple = 0, pows[] = {85*85*85*85, 85*85*85, 85*85, 85, 1};
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while (delims) {
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c = getc_nospace(fp);
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if (c == '<') {
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c = getc_nospace(fp);
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if (c == '~') break;
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ungetc(c, fp);
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}
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else if (c == EOF) {
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eprintf("ascii85: missing <~\n");
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exit(1);
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}
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}
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for (;;) {
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c = getc_nospace(fp);
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if (c == 'z' && count == 0) {
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decode_tuple(0, 5);
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continue;
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}
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if (c == 'y' && count == 0) {
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decode_tuple(0x20202020, 5);
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continue;
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}
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if (c == '~' && delims) {
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c = getc_nospace(fp);
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if (c != '>') {
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eprintf("ascii85: ~ without >\n");
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exit(1);
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}
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c = EOF;
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end = 1;
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}
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if (c == EOF) {
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if (delims && !end) {
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eprintf("ascii85: missing ~>\n");
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exit(1);
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}
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if (count > 0) {
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tuple += pows[count-1];
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decode_tuple(tuple, count);
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}
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break;
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}
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if (c < '!' || c > 'u') {
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if (ignore_garbage) continue;
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eprintf("ascii85: invalid character '%c'\n", c);
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exit(1);
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}
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tuple += (c - '!') * pows[count++];
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if (count == 5) {
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decode_tuple(tuple, count);
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tuple = 0;
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count = 0;
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}
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}
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}
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int main(int argc, char *argv[]) {
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extern char *optarg;
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extern int optind, optopt, opterr;
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int opt, long_optind, decode = 0, ignore_garbage = 0, delims = 0, wrap = 76, y_abbr = 0;
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FILE *fp = stdin;
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char *opts = "dinw:yh";
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struct option long_opts[] = {
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{"decode", no_argument, NULL, 'd'},
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{"ignore-garbage", no_argument, NULL, 'i'},
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{"no-delims", no_argument, NULL, 'n'},
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{"wrap", required_argument, NULL, 'w'},
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{"y-abbr", no_argument, NULL, 'y'},
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{"help", no_argument, NULL, 'h'},
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{NULL, no_argument, NULL, 0}
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};
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opterr = 0;
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while ((opt = getopt_long(argc, argv, opts, long_opts, &long_optind)) != -1) {
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switch (opt) {
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case 'd': decode = 1; break;
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case 'i': ignore_garbage = 1; break;
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case 'n': delims = 0; break;
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case 'w': sscanf(optarg, "%d", &wrap); break;
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case 'y': y_abbr = 1; break;
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case 'h': printf(HELP_TEXT); exit(0);
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case '?':
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eprintf("ascii85: ");
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if (strchr("w", optopt) != NULL)
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eprintf("option '-%c' requires an argument\n", optopt);
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else
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eprintf("invalid option -- %c\n", optopt);
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eprintf(USAGE_TEXT);
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exit(1);
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default: break;
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}
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}
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if (optind == argc - 1 && strcmp(argv[optind], "-")) {
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fp = fopen(argv[optind], "rb");
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if (fp == NULL) {
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eprintf("ascii85: %s: %s\n", argv[optind], strerror(errno));
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exit(1);
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}
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}
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else if (optind > argc) {
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eprintf("ascii85: too many operands or wrong operand order\n");
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eprintf(USAGE_TEXT);
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exit(1);
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}
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if (wrap < 1) wrap = 0;
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if (decode)
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ascii85_decode(fp, delims, ignore_garbage);
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else
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ascii85_encode(fp, delims, wrap, y_abbr);
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fflush(stdout);
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fclose(fp);
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return 0;
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}
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