| 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 |