Intensity compensation for B-frames in AP was missing
[libav.git] / libavformat / base64.c
1 /*
2 * Base64.c
3 * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file base64.c
24 * @brief Base64 Encode/Decode
25 * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
26 */
27
28 #include "common.h"
29 #include "base64.h"
30
31 /* ---------------- private code */
32 static uint8_t map2[] =
33 {
34 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
35 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
36 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
37 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
38 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
39 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
40 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
41 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
42 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
43 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
44 };
45
46 int av_base64_decode(uint8_t * out, const char *in, int out_length)
47 {
48 int i, v;
49 uint8_t *dst = out;
50
51 v = 0;
52 for (i = 0; in[i] && in[i] != '='; i++) {
53 unsigned int index= in[i]-43;
54 if (index>=(sizeof(map2)/sizeof(map2[0])) || map2[index] == 0xff)
55 return -1;
56 v = (v << 6) + map2[index];
57 if (i & 3) {
58 if (dst - out < out_length) {
59 *dst++ = v >> (6 - 2 * (i & 3));
60 }
61 }
62 }
63
64 return (dst - out);
65 }
66
67 /*****************************************************************************
68 * b64_encode: stolen from VLC's http.c
69 * simplified by michael
70 * fixed edge cases and made it work from data (vs. strings) by ryan.
71 *****************************************************************************/
72
73 char *av_base64_encode(uint8_t * src, int len)
74 {
75 static const char b64[] =
76 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
77 char *ret, *dst;
78 unsigned i_bits = 0;
79 int i_shift = 0;
80 int bytes_remaining = len;
81
82 if (len < UINT_MAX / 4) {
83 ret = dst = av_malloc(len * 4 / 3 + 12);
84 } else
85 return NULL;
86
87 if (len) { // special edge case, what should we really do here?
88 while (bytes_remaining) {
89 i_bits = (i_bits << 8) + *src++;
90 bytes_remaining--;
91 i_shift += 8;
92
93 do {
94 *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
95 i_shift -= 6;
96 } while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
97 }
98 while ((dst - ret) & 3)
99 *dst++ = '=';
100 }
101 *dst = '\0';
102
103 return ret;
104 }
105
106 // #define TEST_BASE64
107
108 #ifdef TEST_BASE64
109 #include "avutil.h"
110
111 int b64test()
112 {
113 int numerr = 0;
114 int len;
115 int numtest = 1;
116 uint8_t decode[1000];
117 struct test {
118 void *data;
119 int len;
120 const char *result;
121 } *t, tests[] = {
122 {
123 "", 0, ""}, {
124 "1", 1, "MQ=="}, {
125 "22", 2, "MjI="}, {
126 "333", 3, "MzMz"}, {
127 "4444", 4, "NDQ0NA=="}, {
128 "55555", 5, "NTU1NTU="}, {
129 "abc:def", 7, "YWJjOmRlZg=="}, {
130 NULL}
131 };
132 for (t = tests; t->data; t++) {
133 char *str;
134
135 av_log(NULL, AV_LOG_ERROR, "Encoding %s...\n", (char *) t->data);
136 str = av_base64_encode(t->data, t->len);
137 if (str) {
138 av_log(NULL, AV_LOG_ERROR, "Encoded to %s...\n", str);
139 if (strcmp(str, t->result) != 0) {
140 av_log(NULL, AV_LOG_ERROR, "failed test %d: %s != %s\n",
141 numtest, str, t->result);
142 numerr++;
143 }
144 av_free(str);
145 }
146
147 av_log(NULL, AV_LOG_ERROR, "Done encoding, about to decode...\n");
148 len = av_base64_decode(decode, t->result, sizeof(decode));
149 if (len != t->len) {
150 av_log(NULL, AV_LOG_ERROR, "failed test %d: len %d != %d\n",
151 numtest, len, t->len);
152 numerr++;
153 } else if (memcmp(decode, t->data, t->len) != 0) {
154 av_log(NULL, AV_LOG_ERROR, "failed test %d: data\n", numtest);
155 numerr++;
156 } else {
157 av_log(NULL, AV_LOG_ERROR, "Decoded to %s\n",
158 (char *) t->data);
159 }
160 numtest++;
161 }
162
163 #undef srand
164 #undef rand
165
166 {
167 int test_count;
168 srand(123141); // time(NULL));
169 for (test_count = 0; test_count < 100; test_count++) {
170 int size = rand() % 1024;
171 int ii;
172 uint8_t *data;
173 char *encoded_result;
174
175 av_log(NULL, AV_LOG_ERROR, "Test %d: Size %d bytes...",
176 test_count, size);
177 data = (uint8_t *) av_malloc(size);
178 for (ii = 0; ii < size; ii++) {
179 data[ii] = rand() % 255;
180 }
181
182 encoded_result = av_base64_encode(data, size);
183 if (encoded_result) {
184 int decode_buffer_size = size + 10; // try without 10 as well
185 uint8_t *decode_buffer = av_malloc(decode_buffer_size);
186 if (decode_buffer) {
187 int decoded_size =
188 av_base64_decode(decode_buffer, encoded_result,
189 decode_buffer_size);
190
191 if (decoded_size != size) {
192 av_log(NULL, AV_LOG_ERROR,
193 "Decoded/Encoded size mismatch (%d != %d)\n",
194 decoded_size, size);
195 } else {
196 if (memcmp(decode_buffer, data, decoded_size) == 0) {
197 av_log(NULL, AV_LOG_ERROR, "Passed!\n");
198 } else {
199 av_log(NULL, AV_LOG_ERROR,
200 "Failed (Data differs)!\n");
201 }
202 }
203 av_free(decode_buffer);
204 }
205
206 av_free(encoded_result);
207 }
208 }
209 }
210
211 // these are invalid strings, that it currently decodes (which it probably shouldn't?)
212 {
213 uint8_t str[32];
214 if (av_base64_decode(str, "M=M=", sizeof(str)) != -1) {
215 av_log(NULL, AV_LOG_ERROR,
216 "failed test %d: successful decode of `M=M='\n",
217 numtest++);
218 numerr++;
219 }
220 if (av_base64_decode(str, "MQ===", sizeof(str)) != -1) {
221 av_log(NULL, AV_LOG_ERROR,
222 "failed test %d: successful decode of `MQ==='\n",
223 numtest++);
224 numerr++;
225 }
226 }
227
228 return numerr;
229 }
230 #endif
231