| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 <limits.h> | ||
| 28 | #include <stddef.h> | ||
| 29 | |||
| 30 | #include "base64.h" | ||
| 31 | #include "base64_internal.h" | ||
| 32 | #include "error.h" | ||
| 33 | |||
| 34 | #if ARCH_AARCH64 | ||
| 35 | #include "libavutil/aarch64/cpu.h" | ||
| 36 | #include "libavutil/aarch64/base64.h" | ||
| 37 | #endif | ||
| 38 | |||
| 39 | /* ---------------- private code */ | ||
| 40 | static const uint8_t map2[256] = | ||
| 41 | { | ||
| 42 | 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 43 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 44 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 45 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 46 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 47 | 0xff, 0xff, 0xff, | ||
| 48 | |||
| 49 | 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36, | ||
| 50 | 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, | ||
| 51 | 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01, | ||
| 52 | 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, | ||
| 53 | 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, | ||
| 54 | 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | ||
| 55 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b, | ||
| 56 | 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, | ||
| 57 | 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, | ||
| 58 | 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, | ||
| 59 | |||
| 60 | 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 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 71 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 72 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 73 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 74 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 75 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 76 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
| 77 | }; | ||
| 78 | |||
| 79 | #define BASE64_DEC_STEP(i) do { \ | ||
| 80 | bits = map2[in[i]]; \ | ||
| 81 | if (bits & 0x80) \ | ||
| 82 | goto out ## i; \ | ||
| 83 | v = i ? (v << 6) + bits : bits; \ | ||
| 84 | } while(0) | ||
| 85 | |||
| 86 | 63 | int av_base64_decode(uint8_t *out, const char *in_str, int out_size) | |
| 87 | { | ||
| 88 | 63 | uint8_t *dst = out; | |
| 89 | uint8_t *end; | ||
| 90 | // no sign extension | ||
| 91 | 63 | const uint8_t *in = in_str; | |
| 92 | 63 | unsigned bits = 0xff; | |
| 93 | unsigned v; | ||
| 94 | |||
| 95 |
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63 | if (!out) |
| 96 | 15 | goto validity_check; | |
| 97 | |||
| 98 | 48 | end = out + out_size; | |
| 99 |
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46512 | while (end - dst > 3) { |
| 100 |
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46472 | BASE64_DEC_STEP(0); |
| 101 |
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46469 | BASE64_DEC_STEP(1); |
| 102 |
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46469 | BASE64_DEC_STEP(2); |
| 103 |
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46466 | BASE64_DEC_STEP(3); |
| 104 | // Using AV_WB32 directly confuses compiler | ||
| 105 | 46464 | v = av_be2ne32(v << 8); | |
| 106 | 46464 | AV_WN32(dst, v); | |
| 107 | 46464 | dst += 3; | |
| 108 | 46464 | in += 4; | |
| 109 | } | ||
| 110 |
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40 | if (end - dst) { |
| 111 |
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37 | BASE64_DEC_STEP(0); |
| 112 |
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37 | BASE64_DEC_STEP(1); |
| 113 |
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37 | BASE64_DEC_STEP(2); |
| 114 |
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32 | BASE64_DEC_STEP(3); |
| 115 | 26 | *dst++ = v >> 16; | |
| 116 |
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26 | if (end - dst) |
| 117 | 24 | *dst++ = v >> 8; | |
| 118 |
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26 | if (end - dst) |
| 119 | 20 | *dst++ = v; | |
| 120 | 26 | in += 4; | |
| 121 | } | ||
| 122 | 44 | validity_check: | |
| 123 | while (1) { | ||
| 124 |
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56 | BASE64_DEC_STEP(0); |
| 125 | 31 | in++; | |
| 126 |
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31 | BASE64_DEC_STEP(0); |
| 127 | 31 | in++; | |
| 128 |
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31 | BASE64_DEC_STEP(0); |
| 129 | 20 | in++; | |
| 130 |
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20 | BASE64_DEC_STEP(0); |
| 131 | 12 | in++; | |
| 132 | } | ||
| 133 | |||
| 134 | 8 | out3: | |
| 135 |
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8 | if (end - dst) |
| 136 | 8 | *dst++ = v >> 10; | |
| 137 | 8 | v <<= 2; | |
| 138 | 16 | out2: | |
| 139 |
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16 | if (end - dst) |
| 140 | 14 | *dst++ = v >> 4; | |
| 141 | 16 | out1: | |
| 142 | 63 | out0: | |
| 143 |
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63 | return bits & 1 ? AVERROR_INVALIDDATA : out ? dst - out : 0; |
| 144 | } | ||
| 145 | |||
| 146 | /***************************************************************************** | ||
| 147 | * b64_encode: Stolen from VLC's http.c. | ||
| 148 | * Simplified by Michael. | ||
| 149 | * Fixed edge cases and made it work from data (vs. strings) by Ryan. | ||
| 150 | *****************************************************************************/ | ||
| 151 | |||
| 152 | 23 | char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size) | |
| 153 | { | ||
| 154 | static const char b64[] = | ||
| 155 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | ||
| 156 | |||
| 157 |
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23 | if (in_size >= UINT_MAX / 4 || |
| 158 |
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23 | out_size < AV_BASE64_SIZE(in_size)) |
| 159 | ✗ | return NULL; | |
| 160 | #if ARCH_AARCH64 | ||
| 161 | if (in_size >= 48 && have_neon(av_get_cpu_flags())) { | ||
| 162 | return ff_base64_encode_neon(out, in, in_size, b64); | ||
| 163 | } | ||
| 164 | #endif | ||
| 165 | 23 | return ff_base64_encode_c(out, in, in_size, b64); | |
| 166 | } | ||
| 167 |