Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib/base64.c @ 6180:6b0fe0f93896 HEAD
Added t_base64_decode_str().
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 06 Aug 2007 20:49:06 +0300 |
parents | c46a29e0ea9d |
children | c02c7912fb15 |
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/* Based on the sources of Cyrus IMAP: * * Copyright (c) 2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any other legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "lib.h" #include "base64.h" #include "buffer.h" static const char basis_64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; void base64_encode(const void *src, size_t src_size, buffer_t *dest) { const unsigned char *src_c = src; size_t src_pos; int c1, c2, c3; for (src_pos = 0; src_pos < src_size; ) { c1 = src_c[src_pos++]; buffer_append_c(dest, basis_64[c1 >> 2]); c2 = src_pos == src_size ? 0 : src_c[src_pos]; buffer_append_c(dest, basis_64[((c1 & 0x03) << 4) | ((c2 & 0xf0) >> 4)]); if (src_pos++ == src_size) { buffer_append(dest, "==", 2); break; } c3 = src_pos == src_size ? 0 : src_c[src_pos]; buffer_append_c(dest, basis_64[((c2 & 0x0f) << 2) | ((c3 & 0xc0) >> 6)]); if (src_pos++ == src_size) { buffer_append_c(dest, '='); break; } buffer_append_c(dest, basis_64[c3 & 0x3f]); } } #define XX 127 /* Table for decoding base64 */ static const char index_64[256] = { XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,62, XX,XX,XX,63, 52,53,54,55, 56,57,58,59, 60,61,XX,XX, XX,XX,XX,XX, XX, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, 15,16,17,18, 19,20,21,22, 23,24,25,XX, XX,XX,XX,XX, XX,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, 41,42,43,44, 45,46,47,48, 49,50,51,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, }; #define IS_EMPTY(c) \ ((c) == '\n' || (c) == '\r' || (c) == ' ' || (c) == '\t') int base64_decode(const void *src, size_t src_size, size_t *src_pos_r, buffer_t *dest) { const unsigned char *src_c = src; size_t src_pos; unsigned char buf[4]; int c1, c2, c3, c4; size_t size; int ret = 1; for (src_pos = 0; src_pos+3 < src_size; ) { c1 = src_c[src_pos++]; if (IS_EMPTY(c1)) continue; if (index_64[c1] == XX) return -1; c2 = src_c[src_pos++]; if (index_64[c2] == XX) return -1; c3 = src_c[src_pos++]; if (c3 != '=' && index_64[c3] == XX) return -1; c4 = src_c[src_pos++]; if (c4 != '=' && index_64[c4] == XX) return -1; buf[0] = (index_64[c1] << 2) | ((index_64[c2] & 0x30) >> 4); if (c3 == '=') { if (c4 != '=') return -1; size = 1; } else { buf[1] = ((index_64[c2] & 0xf) << 4) | ((index_64[c3] & 0x3c) >> 2); if (c4 == '=') size = 2; else { buf[2] = ((index_64[c3] & 0x3) << 6) | index_64[c4]; size = 3; } } buffer_append(dest, buf, size); if (size < 3) { /* end of base64 data */ ret = 0; break; } } for (; src_pos < src_size; src_pos++) { if (!IS_EMPTY(src_c[src_pos])) break; } if (src_pos_r != NULL) *src_pos_r = src_pos; return ret; } buffer_t *t_base64_decode_str(const char *str) { buffer_t *buf; size_t len = strlen(str); buf = buffer_create_dynamic(pool_datastack_create(), MAX_BASE64_DECODED_SIZE(len)); (void)base64_decode(str, len, NULL, buf); return buf; }