2 * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * @file libavutil/base64.c
23 * @brief Base64 encode/decode
24 * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
30 /* ---------------- private code */
31 static const uint8_t map2[] =
33 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
34 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
35 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
36 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
37 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
38 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
39 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
40 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
41 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
42 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
45 int av_base64_decode(uint8_t * out, const char *in, int out_length)
51 for (i = 0; in[i] && in[i] != '='; i++) {
52 unsigned int index= in[i]-43;
53 if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
55 v = (v << 6) + map2[index];
57 if (dst - out < out_length) {
58 *dst++ = v >> (6 - 2 * (i & 3));
66 /*****************************************************************************
67 * b64_encode: Stolen from VLC's http.c.
68 * Simplified by Michael.
69 * Fixed edge cases and made it work from data (vs. strings) by Ryan.
70 *****************************************************************************/
72 char *av_base64_encode(char * buf, int buf_len, const uint8_t * src, int len)
74 static const char b64[] =
75 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
79 int bytes_remaining = len;
81 if (len >= UINT_MAX / 4 ||
82 buf_len < len * 4 / 3 + 12)
85 while (bytes_remaining) {
86 i_bits = (i_bits << 8) + *src++;
91 *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
93 } while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
95 while ((dst - ret) & 3)
111 uint8_t decode[1000];
122 "4444", 4, "NDQ0NA=="}, {
123 "55555", 5, "NTU1NTU="}, {
124 "abc:def", 7, "YWJjOmRlZg=="}, {
127 for (t = tests; t->data; t++) {
130 av_log(NULL, AV_LOG_ERROR, "Encoding %s...\n", (char *) t->data);
131 str = av_base64_encode(t->data, t->len);
133 av_log(NULL, AV_LOG_ERROR, "Encoded to %s...\n", str);
134 if (strcmp(str, t->result) != 0) {
135 av_log(NULL, AV_LOG_ERROR, "failed test %d: %s != %s\n",
136 numtest, str, t->result);
142 av_log(NULL, AV_LOG_ERROR, "Done encoding, about to decode...\n");
143 len = av_base64_decode(decode, t->result, sizeof(decode));
145 av_log(NULL, AV_LOG_ERROR, "failed test %d: len %d != %d\n",
146 numtest, len, t->len);
148 } else if (memcmp(decode, t->data, t->len) != 0) {
149 av_log(NULL, AV_LOG_ERROR, "failed test %d: data\n", numtest);
152 av_log(NULL, AV_LOG_ERROR, "Decoded to %s\n",
163 srand(123141); // time(NULL));
164 for (test_count = 0; test_count < 100; test_count++) {
165 int size = rand() % 1024;
168 char *encoded_result;
170 av_log(NULL, AV_LOG_ERROR, "Test %d: Size %d bytes...",
172 data = (uint8_t *) av_malloc(size);
173 for (ii = 0; ii < size; ii++) {
174 data[ii] = rand() % 255;
177 encoded_result = av_base64_encode(data, size);
178 if (encoded_result) {
179 int decode_buffer_size = size + 10; // try without 10 as well
180 uint8_t *decode_buffer = av_malloc(decode_buffer_size);
183 av_base64_decode(decode_buffer, encoded_result,
186 if (decoded_size != size) {
187 av_log(NULL, AV_LOG_ERROR,
188 "Decoded/Encoded size mismatch (%d != %d)\n",
191 if (memcmp(decode_buffer, data, decoded_size) == 0) {
192 av_log(NULL, AV_LOG_ERROR, "Passed!\n");
194 av_log(NULL, AV_LOG_ERROR,
195 "Failed (Data differs)!\n");
198 av_free(decode_buffer);
201 av_free(encoded_result);
206 // these are invalid strings, that it currently decodes (which it probably shouldn't?)
209 if (av_base64_decode(str, "M=M=", sizeof(str)) != -1) {
210 av_log(NULL, AV_LOG_ERROR,
211 "failed test %d: successful decode of `M=M='\n",
215 if (av_base64_decode(str, "MQ===", sizeof(str)) != -1) {
216 av_log(NULL, AV_LOG_ERROR,
217 "failed test %d: successful decode of `MQ==='\n",