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 */ 33static 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 79int 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 122out3: 123 *dst++ = v >> 10; 124 v <<= 2; 125out2: 126 *dst++ = v >> 4; 127out1: 128out0: 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 138char *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 182static 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 232int 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 282