Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
4349 | Serge | 1 | /* |
2 | * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com) |
||
3 | * |
||
4 | * This file is part of FFmpeg. |
||
5 | * |
||
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. |
||
10 | * |
||
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. |
||
15 | * |
||
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 |
||
19 | */ |
||
20 | |||
21 | /** |
||
22 | * @file |
||
23 | * @brief Base64 encode/decode |
||
24 | * @author Ryan Martell |
||
25 | */ |
||
26 | |||
27 | #include "common.h" |
||
28 | #include "base64.h" |
||
29 | #include "intreadwrite.h" |
||
30 | |||
31 | /* ---------------- private code */ |
||
32 | static const uint8_t map2[256] = |
||
33 | { |
||
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, |
||
39 | 0xff, 0xff, 0xff, |
||
40 | |||
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, |
||
51 | |||
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, |
||
69 | }; |
||
70 | |||
71 | #define BASE64_DEC_STEP(i) do { \ |
||
72 | bits = map2[in[i]]; \ |
||
73 | if (bits & 0x80) \ |
||
74 | goto out ## i; \ |
||
75 | v = i ? (v << 6) + bits : bits; \ |
||
76 | } while(0) |
||
77 | |||
78 | int av_base64_decode(uint8_t *out, const char *in_str, int out_size) |
||
79 | { |
||
80 | uint8_t *dst = out; |
||
81 | uint8_t *end = out + out_size; |
||
82 | // no sign extension |
||
83 | const uint8_t *in = in_str; |
||
84 | unsigned bits = 0xff; |
||
85 | unsigned v; |
||
86 | |||
87 | while (end - dst > 3) { |
||
88 | BASE64_DEC_STEP(0); |
||
89 | BASE64_DEC_STEP(1); |
||
90 | BASE64_DEC_STEP(2); |
||
91 | BASE64_DEC_STEP(3); |
||
92 | // Using AV_WB32 directly confuses compiler |
||
93 | v = av_be2ne32(v << 8); |
||
94 | AV_WN32(dst, v); |
||
95 | dst += 3; |
||
96 | in += 4; |
||
97 | } |
||
98 | if (end - dst) { |
||
99 | BASE64_DEC_STEP(0); |
||
100 | BASE64_DEC_STEP(1); |
||
101 | BASE64_DEC_STEP(2); |
||
102 | BASE64_DEC_STEP(3); |
||
103 | *dst++ = v >> 16; |
||
104 | if (end - dst) |
||
105 | *dst++ = v >> 8; |
||
106 | if (end - dst) |
||
107 | *dst++ = v; |
||
108 | in += 4; |
||
109 | } |
||
110 | while (1) { |
||
111 | BASE64_DEC_STEP(0); |
||
112 | in++; |
||
113 | BASE64_DEC_STEP(0); |
||
114 | in++; |
||
115 | BASE64_DEC_STEP(0); |
||
116 | in++; |
||
117 | BASE64_DEC_STEP(0); |
||
118 | in++; |
||
119 | } |
||
120 | |||
121 | out3: |
||
122 | *dst++ = v >> 10; |
||
123 | v <<= 2; |
||
124 | out2: |
||
125 | *dst++ = v >> 4; |
||
126 | out1: |
||
127 | out0: |
||
128 | return bits & 1 ? AVERROR_INVALIDDATA : dst - out; |
||
129 | } |
||
130 | |||
131 | /***************************************************************************** |
||
132 | * b64_encode: Stolen from VLC's http.c. |
||
133 | * Simplified by Michael. |
||
134 | * Fixed edge cases and made it work from data (vs. strings) by Ryan. |
||
135 | *****************************************************************************/ |
||
136 | |||
137 | char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size) |
||
138 | { |
||
139 | static const char b64[] = |
||
140 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
||
141 | char *ret, *dst; |
||
142 | unsigned i_bits = 0; |
||
143 | int i_shift = 0; |
||
144 | int bytes_remaining = in_size; |
||
145 | |||
146 | if (in_size >= UINT_MAX / 4 || |
||
147 | out_size < AV_BASE64_SIZE(in_size)) |
||
148 | return NULL; |
||
149 | ret = dst = out; |
||
150 | while (bytes_remaining > 3) { |
||
151 | i_bits = AV_RB32(in); |
||
152 | in += 3; bytes_remaining -= 3; |
||
153 | *dst++ = b64[ i_bits>>26 ]; |
||
154 | *dst++ = b64[(i_bits>>20) & 0x3F]; |
||
155 | *dst++ = b64[(i_bits>>14) & 0x3F]; |
||
156 | *dst++ = b64[(i_bits>>8 ) & 0x3F]; |
||
157 | } |
||
158 | i_bits = 0; |
||
159 | while (bytes_remaining) { |
||
160 | i_bits = (i_bits << 8) + *in++; |
||
161 | bytes_remaining--; |
||
162 | i_shift += 8; |
||
163 | } |
||
164 | while (i_shift > 0) { |
||
165 | *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f]; |
||
166 | i_shift -= 6; |
||
167 | } |
||
168 | while ((dst - ret) & 3) |
||
169 | *dst++ = '='; |
||
170 | *dst = '\0'; |
||
171 | |||
172 | return ret; |
||
173 | } |
||
174 | |||
175 | #ifdef TEST |
||
176 | // LCOV_EXCL_START |
||
177 | |||
178 | #define MAX_DATA_SIZE 1024 |
||
179 | #define MAX_ENCODED_SIZE 2048 |
||
180 | |||
181 | static int test_encode_decode(const uint8_t *data, unsigned int data_size, |
||
182 | const char *encoded_ref) |
||
183 | { |
||
184 | char encoded[MAX_ENCODED_SIZE]; |
||
185 | uint8_t data2[MAX_DATA_SIZE]; |
||
186 | int data2_size, max_data2_size = MAX_DATA_SIZE; |
||
187 | |||
188 | if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) { |
||
189 | printf("Failed: cannot encode the input data\n"); |
||
190 | return 1; |
||
191 | } |
||
192 | if (encoded_ref && strcmp(encoded, encoded_ref)) { |
||
193 | printf("Failed: encoded string differs from reference\n" |
||
194 | "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref); |
||
195 | return 1; |
||
196 | } |
||
197 | |||
198 | if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) != data_size) { |
||
199 | printf("Failed: cannot decode the encoded string\n" |
||
200 | "Encoded:\n%s\n", encoded); |
||
201 | return 1; |
||
202 | } |
||
203 | if ((data2_size = av_base64_decode(data2, encoded, data_size)) != data_size) { |
||
204 | printf("Failed: cannot decode with minimal buffer\n" |
||
205 | "Encoded:\n%s\n", encoded); |
||
206 | return 1; |
||
207 | } |
||
208 | if (memcmp(data2, data, data_size)) { |
||
209 | printf("Failed: encoded/decoded data differs from original data\n"); |
||
210 | return 1; |
||
211 | } |
||
212 | if (av_base64_decode(NULL, encoded, 0) != 0) { |
||
213 | printf("Failed: decode to NULL buffer\n"); |
||
214 | return 1; |
||
215 | } |
||
216 | if (strlen(encoded)) { |
||
217 | char *end = strchr(encoded, '='); |
||
218 | if (!end) |
||
219 | end = encoded + strlen(encoded) - 1; |
||
220 | *end = '%'; |
||
221 | if (av_base64_decode(NULL, encoded, 0) >= 0) { |
||
222 | printf("Failed: error detection\n"); |
||
223 | return 1; |
||
224 | } |
||
225 | } |
||
226 | |||
227 | printf("Passed!\n"); |
||
228 | return 0; |
||
229 | } |
||
230 | |||
231 | int main(int argc, char ** argv) |
||
232 | { |
||
233 | int i, error_count = 0; |
||
234 | struct test { |
||
235 | const uint8_t *data; |
||
236 | const char *encoded_ref; |
||
237 | } tests[] = { |
||
238 | { "", ""}, |
||
239 | { "1", "MQ=="}, |
||
240 | { "22", "MjI="}, |
||
241 | { "333", "MzMz"}, |
||
242 | { "4444", "NDQ0NA=="}, |
||
243 | { "55555", "NTU1NTU="}, |
||
244 | { "666666", "NjY2NjY2"}, |
||
245 | { "abc:def", "YWJjOmRlZg=="}, |
||
246 | }; |
||
247 | char in[1024], out[2048]; |
||
248 | |||
249 | printf("Encoding/decoding tests\n"); |
||
250 | for (i = 0; i < FF_ARRAY_ELEMS(tests); i++) |
||
251 | error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref); |
||
252 | |||
253 | if (argc>1 && !strcmp(argv[1], "-t")) { |
||
254 | memset(in, 123, sizeof(in)); |
||
255 | for(i=0; i<10000; i++){ |
||
256 | START_TIMER |
||
257 | av_base64_encode(out, sizeof(out), in, sizeof(in)); |
||
258 | STOP_TIMER("encode") |
||
259 | } |
||
260 | for(i=0; i<10000; i++){ |
||
261 | START_TIMER |
||
262 | av_base64_decode(in, out, sizeof(in)); |
||
263 | STOP_TIMER("decode") |
||
264 | } |
||
265 | |||
266 | for(i=0; i<10000; i++){ |
||
267 | START_TIMER |
||
268 | av_base64_decode(NULL, out, 0); |
||
269 | STOP_TIMER("syntax check") |
||
270 | } |
||
271 | } |
||
272 | |||
273 | if (error_count) |
||
274 | printf("Error Count: %d.\n", error_count); |
||
275 | |||
276 | return !!error_count; |
||
277 | } |
||
278 | |||
279 | // LCOV_EXCL_STOP |
||
280 | #endif10000;>10000;>10000;>>><>><>>=><=>><>><> |