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https://github.com/radareorg/radare2.git
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e48b9b2f30
f.example: $ r2 -c=H -e cfg.sandbox=true -
159 lines
3.8 KiB
C
159 lines
3.8 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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#include <r_types.h>
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static 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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static 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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static 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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R_API void r_base85_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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R_API void r_base85_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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R_API void r_base85_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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r_base85_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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r_base85_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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r_base85_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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r_base85_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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