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* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* @brief Base64 Encode/Decode
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* @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
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/* ---------------- private code */
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static uint8_t map2[] =
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0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
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0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
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0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
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0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
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int av_base64_decode(uint8_t * out, const char *in, int out_length)
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for (i = 0; in[i] && in[i] != '='; i++) {
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unsigned int index= in[i]-43;
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if (index>=(sizeof(map2)/sizeof(map2[0])) || map2[index] == 0xff)
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v = (v << 6) + map2[index];
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if (dst - out < out_length) {
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*dst++ = v >> (6 - 2 * (i & 3));
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/*****************************************************************************
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* b64_encode: stolen from VLC's http.c
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* simplified by michael
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* fixed edge cases and made it work from data (vs. strings) by ryan.
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*****************************************************************************/
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char *av_base64_encode(uint8_t * src, int len)
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int bytes_remaining = len;
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if (len < UINT_MAX / 4) {
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ret = dst = av_malloc(len * 4 / 3 + 12);
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if (len) { // special edge case, what should we really do here?
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while (bytes_remaining) {
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i_bits = (i_bits << 8) + *src++;
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*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
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while ((dst - ret) & 3)
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// #define TEST_BASE64
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uint8_t decode[1000];
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"4444", 4, "NDQ0NA=="}, {
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"55555", 5, "NTU1NTU="}, {
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"abc:def", 7, "YWJjOmRlZg=="}, {
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for (t = tests; t->data; t++) {
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av_log(NULL, AV_LOG_ERROR, "Encoding %s...\n", (char *) t->data);
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str = av_base64_encode(t->data, t->len);
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av_log(NULL, AV_LOG_ERROR, "Encoded to %s...\n", str);
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if (strcmp(str, t->result) != 0) {
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av_log(NULL, AV_LOG_ERROR, "failed test %d: %s != %s\n",
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numtest, str, t->result);
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av_log(NULL, AV_LOG_ERROR, "Done encoding, about to decode...\n");
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len = av_base64_decode(decode, t->result, sizeof(decode));
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av_log(NULL, AV_LOG_ERROR, "failed test %d: len %d != %d\n",
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numtest, len, t->len);
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} else if (memcmp(decode, t->data, t->len) != 0) {
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av_log(NULL, AV_LOG_ERROR, "failed test %d: data\n", numtest);
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av_log(NULL, AV_LOG_ERROR, "Decoded to %s\n",
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srand(123141); // time(NULL));
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for (test_count = 0; test_count < 100; test_count++) {
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int size = rand() % 1024;
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char *encoded_result;
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av_log(NULL, AV_LOG_ERROR, "Test %d: Size %d bytes...",
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data = (uint8_t *) av_malloc(size);
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for (ii = 0; ii < size; ii++) {
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data[ii] = rand() % 255;
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encoded_result = av_base64_encode(data, size);
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if (encoded_result) {
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int decode_buffer_size = size + 10; // try without 10 as well
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uint8_t *decode_buffer = av_malloc(decode_buffer_size);
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av_base64_decode(decode_buffer, encoded_result,
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if (decoded_size != size) {
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av_log(NULL, AV_LOG_ERROR,
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"Decoded/Encoded size mismatch (%d != %d)\n",
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if (memcmp(decode_buffer, data, decoded_size) == 0) {
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av_log(NULL, AV_LOG_ERROR, "Passed!\n");
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av_log(NULL, AV_LOG_ERROR,
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"Failed (Data differs)!\n");
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av_free(decode_buffer);
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av_free(encoded_result);
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// these are invalid strings, that it currently decodes (which it probably shouldn't?)
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if (av_base64_decode(str, "M=M=", sizeof(str)) != -1) {
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av_log(NULL, AV_LOG_ERROR,
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"failed test %d: successful decode of `M=M='\n",
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if (av_base64_decode(str, "MQ===", sizeof(str)) != -1) {
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av_log(NULL, AV_LOG_ERROR,
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"failed test %d: successful decode of `MQ==='\n",