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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 "error.h" | ||
32 | #include "intreadwrite.h" | ||
33 | |||
34 | /* ---------------- private code */ | ||
35 | static const uint8_t map2[256] = | ||
36 | { | ||
37 | 0xfe, 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, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
41 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
42 | 0xff, 0xff, 0xff, | ||
43 | |||
44 | 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36, | ||
45 | 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, | ||
46 | 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01, | ||
47 | 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, | ||
48 | 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, | ||
49 | 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | ||
50 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b, | ||
51 | 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, | ||
52 | 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, | ||
53 | 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, | ||
54 | |||
55 | 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 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
71 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, | ||
72 | }; | ||
73 | |||
74 | #define BASE64_DEC_STEP(i) do { \ | ||
75 | bits = map2[in[i]]; \ | ||
76 | if (bits & 0x80) \ | ||
77 | goto out ## i; \ | ||
78 | v = i ? (v << 6) + bits : bits; \ | ||
79 | } while(0) | ||
80 | |||
81 | 50 | int av_base64_decode(uint8_t *out, const char *in_str, int out_size) | |
82 | { | ||
83 | 50 | uint8_t *dst = out; | |
84 | uint8_t *end; | ||
85 | // no sign extension | ||
86 | 50 | const uint8_t *in = in_str; | |
87 | 50 | unsigned bits = 0xff; | |
88 | unsigned v; | ||
89 | |||
90 |
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50 | if (!out) |
91 | 15 | goto validity_check; | |
92 | |||
93 | 35 | end = out + out_size; | |
94 |
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46494 | while (end - dst > 3) { |
95 |
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46467 | BASE64_DEC_STEP(0); |
96 |
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46464 | BASE64_DEC_STEP(1); |
97 |
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46464 | BASE64_DEC_STEP(2); |
98 |
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46461 | BASE64_DEC_STEP(3); |
99 | // Using AV_WB32 directly confuses compiler | ||
100 | 46459 | v = av_be2ne32(v << 8); | |
101 | 46459 | AV_WN32(dst, v); | |
102 | 46459 | dst += 3; | |
103 | 46459 | in += 4; | |
104 | } | ||
105 |
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27 | if (end - dst) { |
106 |
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26 | BASE64_DEC_STEP(0); |
107 |
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26 | BASE64_DEC_STEP(1); |
108 |
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26 | BASE64_DEC_STEP(2); |
109 |
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21 | BASE64_DEC_STEP(3); |
110 | 17 | *dst++ = v >> 16; | |
111 |
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17 | if (end - dst) |
112 | 17 | *dst++ = v >> 8; | |
113 |
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17 | if (end - dst) |
114 | 17 | *dst++ = v; | |
115 | 17 | in += 4; | |
116 | } | ||
117 | 33 | validity_check: | |
118 | while (1) { | ||
119 |
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45 | BASE64_DEC_STEP(0); |
120 | 24 | in++; | |
121 |
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24 | BASE64_DEC_STEP(0); |
122 | 24 | in++; | |
123 |
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24 | BASE64_DEC_STEP(0); |
124 | 18 | in++; | |
125 |
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18 | BASE64_DEC_STEP(0); |
126 | 12 | in++; | |
127 | } | ||
128 | |||
129 | 6 | out3: | |
130 | 6 | *dst++ = v >> 10; | |
131 | 6 | v <<= 2; | |
132 | 14 | out2: | |
133 | 14 | *dst++ = v >> 4; | |
134 | 14 | out1: | |
135 | 50 | out0: | |
136 |
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50 | return bits & 1 ? AVERROR_INVALIDDATA : out ? dst - out : 0; |
137 | } | ||
138 | |||
139 | /***************************************************************************** | ||
140 | * b64_encode: Stolen from VLC's http.c. | ||
141 | * Simplified by Michael. | ||
142 | * Fixed edge cases and made it work from data (vs. strings) by Ryan. | ||
143 | *****************************************************************************/ | ||
144 | |||
145 | 23 | char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size) | |
146 | { | ||
147 | static const char b64[] = | ||
148 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | ||
149 | char *ret, *dst; | ||
150 | 23 | unsigned i_bits = 0; | |
151 | 23 | int i_shift = 0; | |
152 | 23 | int bytes_remaining = in_size; | |
153 | |||
154 |
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23 | if (in_size >= UINT_MAX / 4 || |
155 |
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23 | out_size < AV_BASE64_SIZE(in_size)) |
156 | ✗ | return NULL; | |
157 | 23 | ret = dst = out; | |
158 |
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154 | while (bytes_remaining > 3) { |
159 | 131 | i_bits = AV_RB32(in); | |
160 | 131 | in += 3; bytes_remaining -= 3; | |
161 | 131 | *dst++ = b64[ i_bits>>26 ]; | |
162 | 131 | *dst++ = b64[(i_bits>>20) & 0x3F]; | |
163 | 131 | *dst++ = b64[(i_bits>>14) & 0x3F]; | |
164 | 131 | *dst++ = b64[(i_bits>>8 ) & 0x3F]; | |
165 | } | ||
166 | 23 | i_bits = 0; | |
167 |
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58 | while (bytes_remaining) { |
168 | 35 | i_bits = (i_bits << 8) + *in++; | |
169 | 35 | bytes_remaining--; | |
170 | 35 | i_shift += 8; | |
171 | } | ||
172 |
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80 | while (i_shift > 0) { |
173 | 57 | *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f]; | |
174 | 57 | i_shift -= 6; | |
175 | } | ||
176 |
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54 | while ((dst - ret) & 3) |
177 | 31 | *dst++ = '='; | |
178 | 23 | *dst = '\0'; | |
179 | |||
180 | 23 | return ret; | |
181 | } | ||
182 |