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)
106 #define MAX_DATA_SIZE 1024
107 #define MAX_ENCODED_SIZE 2048
109 int test_encode_decode(const uint8_t *data, unsigned int data_size, const char *encoded_ref)
111 char encoded[MAX_ENCODED_SIZE];
112 uint8_t data2[MAX_DATA_SIZE];
113 int data2_size, max_data2_size = MAX_DATA_SIZE;
115 if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) {
116 printf("Failed: cannot encode the input data\n");
119 if (encoded_ref && strcmp(encoded, encoded_ref)) {
120 printf("Failed: encoded string differs from reference\n"
121 "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref);
125 if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) < 0) {
126 printf("Failed: cannot decode the encoded string\n"
127 "Encoded:\n%s\n", encoded);
130 if (memcmp(data2, data, data_size)) {
131 printf("Failed: encoded/decoded data differs from original data\n");
141 int i, error_count = 0;
144 const char *encoded_ref;
150 { "4444", "NDQ0NA=="},
151 { "55555", "NTU1NTU="},
152 { "666666", "NjY2NjY2"},
153 { "abc:def", "YWJjOmRlZg=="},
156 printf("Encoding/decoding tests\n");
157 for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
158 error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);