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
23 * @brief Base64 encode/decode
24 * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
29 #include "intreadwrite.h"
31 /* ---------------- private code */
32 static const uint8_t map2[256] =
34 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
35 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
36 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
37 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
38 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
41 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
42 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
43 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01,
44 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
45 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
46 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
47 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
48 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
49 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
50 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
52 0xff, 0xff, 0xff, 0xff, 0xff,
53 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
54 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
55 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
56 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
57 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
58 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
59 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
60 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
61 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
62 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
63 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
64 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
65 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
66 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
67 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
68 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
71 #define BASE64_DEC_STEP(i) \
75 v = (v << 6) + bits; \
77 *dst++ = v >> (6 - 2 * (i & 3)); \
79 int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
83 uint8_t *end = out + out_size;
85 const uint8_t *in = in_str;
89 while (end - dst > 2) {
117 return bits & 1 ? -1 : dst - out;
120 /*****************************************************************************
121 * b64_encode: Stolen from VLC's http.c.
122 * Simplified by Michael.
123 * Fixed edge cases and made it work from data (vs. strings) by Ryan.
124 *****************************************************************************/
126 char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
128 static const char b64[] =
129 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
133 int bytes_remaining = in_size;
135 if (in_size >= UINT_MAX / 4 ||
136 out_size < AV_BASE64_SIZE(in_size))
139 while (bytes_remaining > 3) {
140 i_bits = AV_RB32(in);
141 in += 3; bytes_remaining -= 3;
142 *dst++ = b64[ i_bits>>26 ];
143 *dst++ = b64[(i_bits>>20) & 0x3F];
144 *dst++ = b64[(i_bits>>14) & 0x3F];
145 *dst++ = b64[(i_bits>>8 ) & 0x3F];
148 while (bytes_remaining) {
149 i_bits = (i_bits << 8) + *in++;
153 while (i_shift > 0) {
154 *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
157 while ((dst - ret) & 3)
169 #define MAX_DATA_SIZE 1024
170 #define MAX_ENCODED_SIZE 2048
172 static int test_encode_decode(const uint8_t *data, unsigned int data_size,
173 const char *encoded_ref)
175 char encoded[MAX_ENCODED_SIZE];
176 uint8_t data2[MAX_DATA_SIZE];
177 int data2_size, max_data2_size = MAX_DATA_SIZE;
179 if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) {
180 printf("Failed: cannot encode the input data\n");
183 if (encoded_ref && strcmp(encoded, encoded_ref)) {
184 printf("Failed: encoded string differs from reference\n"
185 "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref);
189 if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) != data_size) {
190 printf("Failed: cannot decode the encoded string\n"
191 "Encoded:\n%s\n", encoded);
194 if ((data2_size = av_base64_decode(data2, encoded, data_size)) != data_size) {
195 printf("Failed: cannot decode with minimal buffer\n"
196 "Encoded:\n%s\n", encoded);
199 if (memcmp(data2, data, data_size)) {
200 printf("Failed: encoded/decoded data differs from original data\n");
203 if (av_base64_decode(NULL, encoded, 0) != 0) {
204 printf("Failed: decode to NULL buffer\n");
207 if (strlen(encoded)) {
208 char *end = strchr(encoded, '=');
210 end = encoded + strlen(encoded) - 1;
212 if (av_base64_decode(NULL, encoded, 0) >= 0) {
213 printf("Failed: error detection\n");
222 int main(int argc, char ** argv)
224 int i, error_count = 0;
227 const char *encoded_ref;
233 { "4444", "NDQ0NA=="},
234 { "55555", "NTU1NTU="},
235 { "666666", "NjY2NjY2"},
236 { "abc:def", "YWJjOmRlZg=="},
238 char in[1024], out[2048];
240 printf("Encoding/decoding tests\n");
241 for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
242 error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);
244 if (argc>1 && !strcmp(argv[1], "-t")) {
245 memset(in, 123, sizeof(in));
246 for(i=0; i<10000; i++){
248 av_base64_encode(out, sizeof(out), in, sizeof(in));
251 for(i=0; i<10000; i++){
253 av_base64_decode(in, out, sizeof(in));
257 for(i=0; i<10000; i++){
259 av_base64_decode(NULL, out, 0);
260 STOP_TIMER("syntax check")