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"
32 /* ---------------- private code */
33 static const uint8_t map2
[256] =
35 0xfe, 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,
39 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
42 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
43 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
44 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01,
45 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
46 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
47 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
48 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
49 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
50 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
51 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
53 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,
69 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
72 #define BASE64_DEC_STEP(i) do { \
76 v = i ? (v << 6) + bits : bits; \
79 int av_base64_decode(uint8_t *out
, const char *in_str
, int out_size
)
82 uint8_t *end
= out
+ out_size
;
84 const uint8_t *in
= in_str
;
88 while (end
- dst
> 3) {
93 // Using AV_WB32 directly confuses compiler
94 v
= av_be2ne32(v
<< 8);
129 return bits
& 1 ? AVERROR_INVALIDDATA
: dst
- out
;
132 /*****************************************************************************
133 * b64_encode: Stolen from VLC's http.c.
134 * Simplified by Michael.
135 * Fixed edge cases and made it work from data (vs. strings) by Ryan.
136 *****************************************************************************/
138 char *av_base64_encode(char *out
, int out_size
, const uint8_t *in
, int in_size
)
140 static const char b64
[] =
141 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
145 int bytes_remaining
= in_size
;
147 if (in_size
>= UINT_MAX
/ 4 ||
148 out_size
< AV_BASE64_SIZE(in_size
))
151 while (bytes_remaining
> 3) {
152 i_bits
= AV_RB32(in
);
153 in
+= 3; bytes_remaining
-= 3;
154 *dst
++ = b64
[ i_bits
>>26 ];
155 *dst
++ = b64
[(i_bits
>>20) & 0x3F];
156 *dst
++ = b64
[(i_bits
>>14) & 0x3F];
157 *dst
++ = b64
[(i_bits
>>8 ) & 0x3F];
160 while (bytes_remaining
) {
161 i_bits
= (i_bits
<< 8) + *in
++;
165 while (i_shift
> 0) {
166 *dst
++ = b64
[(i_bits
<< 6 >> i_shift
) & 0x3f];
169 while ((dst
- ret
) & 3)
179 #define MAX_DATA_SIZE 1024
180 #define MAX_ENCODED_SIZE 2048
182 static int test_encode_decode(const uint8_t *data
, unsigned int data_size
,
183 const char *encoded_ref
)
185 char encoded
[MAX_ENCODED_SIZE
];
186 uint8_t data2
[MAX_DATA_SIZE
];
187 int data2_size
, max_data2_size
= MAX_DATA_SIZE
;
189 if (!av_base64_encode(encoded
, MAX_ENCODED_SIZE
, data
, data_size
)) {
190 printf("Failed: cannot encode the input data\n");
193 if (encoded_ref
&& strcmp(encoded
, encoded_ref
)) {
194 printf("Failed: encoded string differs from reference\n"
195 "Encoded:\n%s\nReference:\n%s\n", encoded
, encoded_ref
);
199 if ((data2_size
= av_base64_decode(data2
, encoded
, max_data2_size
)) != data_size
) {
200 printf("Failed: cannot decode the encoded string\n"
201 "Encoded:\n%s\n", encoded
);
204 if ((data2_size
= av_base64_decode(data2
, encoded
, data_size
)) != data_size
) {
205 printf("Failed: cannot decode with minimal buffer\n"
206 "Encoded:\n%s\n", encoded
);
209 if (memcmp(data2
, data
, data_size
)) {
210 printf("Failed: encoded/decoded data differs from original data\n");
213 if (av_base64_decode(NULL
, encoded
, 0) != 0) {
214 printf("Failed: decode to NULL buffer\n");
217 if (strlen(encoded
)) {
218 char *end
= strchr(encoded
, '=');
220 end
= encoded
+ strlen(encoded
) - 1;
222 if (av_base64_decode(NULL
, encoded
, 0) >= 0) {
223 printf("Failed: error detection\n");
232 int main(int argc
, char ** argv
)
234 int i
, error_count
= 0;
237 const char *encoded_ref
;
243 { "4444", "NDQ0NA=="},
244 { "55555", "NTU1NTU="},
245 { "666666", "NjY2NjY2"},
246 { "abc:def", "YWJjOmRlZg=="},
248 char in
[1024], out
[2048];
250 printf("Encoding/decoding tests\n");
251 for (i
= 0; i
< FF_ARRAY_ELEMS(tests
); i
++)
252 error_count
+= test_encode_decode(tests
[i
].data
, strlen(tests
[i
].data
), tests
[i
].encoded_ref
);
254 if (argc
>1 && !strcmp(argv
[1], "-t")) {
255 memset(in
, 123, sizeof(in
));
256 for(i
=0; i
<10000; i
++){
258 av_base64_encode(out
, sizeof(out
), in
, sizeof(in
));
261 for(i
=0; i
<10000; i
++){
263 av_base64_decode(in
, out
, sizeof(in
));
267 for(i
=0; i
<10000; i
++){
269 av_base64_decode(NULL
, out
, 0);
270 STOP_TIMER("syntax check")
275 printf("Error Count: %d.\n", error_count
);
277 return !!error_count
;