Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 <rdm4@martellventures.com> (with lots of Michael) | |
25 | */ | |
26 | ||
27 | #include "common.h" | |
28 | #include "base64.h" | |
29 | #include "intreadwrite.h" | |
30 | #include "timer.h" | |
31 | ||
32 | /* ---------------- private code */ | |
33 | static const uint8_t map2[256] = | |
34 | { | |
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, | |
40 | 0xff, 0xff, 0xff, | |
41 | ||
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, | |
52 | ||
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, | |
70 | }; | |
71 | ||
72 | #define BASE64_DEC_STEP(i) do { \ | |
73 | bits = map2[in[i]]; \ | |
74 | if (bits & 0x80) \ | |
75 | goto out ## i; \ | |
76 | v = i ? (v << 6) + bits : bits; \ | |
77 | } while(0) | |
78 | ||
79 | int av_base64_decode(uint8_t *out, const char *in_str, int out_size) | |
80 | { | |
81 | uint8_t *dst = out; | |
82 | uint8_t *end = out + out_size; | |
83 | // no sign extension | |
84 | const uint8_t *in = in_str; | |
85 | unsigned bits = 0xff; | |
86 | unsigned v; | |
87 | ||
88 | while (end - dst > 3) { | |
89 | BASE64_DEC_STEP(0); | |
90 | BASE64_DEC_STEP(1); | |
91 | BASE64_DEC_STEP(2); | |
92 | BASE64_DEC_STEP(3); | |
93 | // Using AV_WB32 directly confuses compiler | |
94 | v = av_be2ne32(v << 8); | |
95 | AV_WN32(dst, v); | |
96 | dst += 3; | |
97 | in += 4; | |
98 | } | |
99 | if (end - dst) { | |
100 | BASE64_DEC_STEP(0); | |
101 | BASE64_DEC_STEP(1); | |
102 | BASE64_DEC_STEP(2); | |
103 | BASE64_DEC_STEP(3); | |
104 | *dst++ = v >> 16; | |
105 | if (end - dst) | |
106 | *dst++ = v >> 8; | |
107 | if (end - dst) | |
108 | *dst++ = v; | |
109 | in += 4; | |
110 | } | |
111 | while (1) { | |
112 | BASE64_DEC_STEP(0); | |
113 | in++; | |
114 | BASE64_DEC_STEP(0); | |
115 | in++; | |
116 | BASE64_DEC_STEP(0); | |
117 | in++; | |
118 | BASE64_DEC_STEP(0); | |
119 | in++; | |
120 | } | |
121 | ||
122 | out3: | |
123 | *dst++ = v >> 10; | |
124 | v <<= 2; | |
125 | out2: | |
126 | *dst++ = v >> 4; | |
127 | out1: | |
128 | out0: | |
129 | return bits & 1 ? AVERROR_INVALIDDATA : dst - out; | |
130 | } | |
131 | ||
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 | *****************************************************************************/ | |
137 | ||
138 | char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size) | |
139 | { | |
140 | static const char b64[] = | |
141 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | |
142 | char *ret, *dst; | |
143 | unsigned i_bits = 0; | |
144 | int i_shift = 0; | |
145 | int bytes_remaining = in_size; | |
146 | ||
147 | if (in_size >= UINT_MAX / 4 || | |
148 | out_size < AV_BASE64_SIZE(in_size)) | |
149 | return NULL; | |
150 | ret = dst = out; | |
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]; | |
158 | } | |
159 | i_bits = 0; | |
160 | while (bytes_remaining) { | |
161 | i_bits = (i_bits << 8) + *in++; | |
162 | bytes_remaining--; | |
163 | i_shift += 8; | |
164 | } | |
165 | while (i_shift > 0) { | |
166 | *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f]; | |
167 | i_shift -= 6; | |
168 | } | |
169 | while ((dst - ret) & 3) | |
170 | *dst++ = '='; | |
171 | *dst = '\0'; | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
176 | #ifdef TEST | |
177 | // LCOV_EXCL_START | |
178 | ||
179 | #define MAX_DATA_SIZE 1024 | |
180 | #define MAX_ENCODED_SIZE 2048 | |
181 | ||
182 | static int test_encode_decode(const uint8_t *data, unsigned int data_size, | |
183 | const char *encoded_ref) | |
184 | { | |
185 | char encoded[MAX_ENCODED_SIZE]; | |
186 | uint8_t data2[MAX_DATA_SIZE]; | |
187 | int data2_size, max_data2_size = MAX_DATA_SIZE; | |
188 | ||
189 | if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) { | |
190 | printf("Failed: cannot encode the input data\n"); | |
191 | return 1; | |
192 | } | |
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); | |
196 | return 1; | |
197 | } | |
198 | ||
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); | |
202 | return 1; | |
203 | } | |
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); | |
207 | return 1; | |
208 | } | |
209 | if (memcmp(data2, data, data_size)) { | |
210 | printf("Failed: encoded/decoded data differs from original data\n"); | |
211 | return 1; | |
212 | } | |
213 | if (av_base64_decode(NULL, encoded, 0) != 0) { | |
214 | printf("Failed: decode to NULL buffer\n"); | |
215 | return 1; | |
216 | } | |
217 | if (strlen(encoded)) { | |
218 | char *end = strchr(encoded, '='); | |
219 | if (!end) | |
220 | end = encoded + strlen(encoded) - 1; | |
221 | *end = '%'; | |
222 | if (av_base64_decode(NULL, encoded, 0) >= 0) { | |
223 | printf("Failed: error detection\n"); | |
224 | return 1; | |
225 | } | |
226 | } | |
227 | ||
228 | printf("Passed!\n"); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | int main(int argc, char ** argv) | |
233 | { | |
234 | int i, error_count = 0; | |
235 | struct test { | |
236 | const uint8_t *data; | |
237 | const char *encoded_ref; | |
238 | } tests[] = { | |
239 | { "", ""}, | |
240 | { "1", "MQ=="}, | |
241 | { "22", "MjI="}, | |
242 | { "333", "MzMz"}, | |
243 | { "4444", "NDQ0NA=="}, | |
244 | { "55555", "NTU1NTU="}, | |
245 | { "666666", "NjY2NjY2"}, | |
246 | { "abc:def", "YWJjOmRlZg=="}, | |
247 | }; | |
248 | char in[1024], out[2048]; | |
249 | ||
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); | |
253 | ||
254 | if (argc>1 && !strcmp(argv[1], "-t")) { | |
255 | memset(in, 123, sizeof(in)); | |
256 | for(i=0; i<10000; i++){ | |
257 | START_TIMER | |
258 | av_base64_encode(out, sizeof(out), in, sizeof(in)); | |
259 | STOP_TIMER("encode") | |
260 | } | |
261 | for(i=0; i<10000; i++){ | |
262 | START_TIMER | |
263 | av_base64_decode(in, out, sizeof(in)); | |
264 | STOP_TIMER("decode") | |
265 | } | |
266 | ||
267 | for(i=0; i<10000; i++){ | |
268 | START_TIMER | |
269 | av_base64_decode(NULL, out, 0); | |
270 | STOP_TIMER("syntax check") | |
271 | } | |
272 | } | |
273 | ||
274 | if (error_count) | |
275 | printf("Error Count: %d.\n", error_count); | |
276 | ||
277 | return !!error_count; | |
278 | } | |
279 | ||
280 | // LCOV_EXCL_STOP | |
281 | #endif |