FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/base64.c
Date: 2025-10-26 07:25:09
Exec Total Coverage
Lines: 72 73 98.6%
Functions: 2 2 100.0%
Branches: 47 54 87.0%
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 "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 63 int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
82 {
83 63 uint8_t *dst = out;
84 uint8_t *end;
85 // no sign extension
86 63 const uint8_t *in = in_str;
87 63 unsigned bits = 0xff;
88 unsigned v;
89
90
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 63 if (!out)
91 15 goto validity_check;
92
93 48 end = out + out_size;
94
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 46512 while (end - dst > 3) {
95
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 46472 BASE64_DEC_STEP(0);
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 46469 BASE64_DEC_STEP(1);
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 46469 BASE64_DEC_STEP(2);
98
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 46466 BASE64_DEC_STEP(3);
99 // Using AV_WB32 directly confuses compiler
100 46464 v = av_be2ne32(v << 8);
101 46464 AV_WN32(dst, v);
102 46464 dst += 3;
103 46464 in += 4;
104 }
105
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 40 if (end - dst) {
106
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 37 BASE64_DEC_STEP(0);
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 37 BASE64_DEC_STEP(1);
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 37 BASE64_DEC_STEP(2);
109
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 32 BASE64_DEC_STEP(3);
110 26 *dst++ = v >> 16;
111
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 26 if (end - dst)
112 24 *dst++ = v >> 8;
113
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 26 if (end - dst)
114 20 *dst++ = v;
115 26 in += 4;
116 }
117 44 validity_check:
118 while (1) {
119
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 56 BASE64_DEC_STEP(0);
120 31 in++;
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 31 BASE64_DEC_STEP(0);
122 31 in++;
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 31 BASE64_DEC_STEP(0);
124 20 in++;
125
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 20 BASE64_DEC_STEP(0);
126 12 in++;
127 }
128
129 8 out3:
130
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 8 if (end - dst)
131 8 *dst++ = v >> 10;
132 8 v <<= 2;
133 16 out2:
134
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 16 if (end - dst)
135 14 *dst++ = v >> 4;
136 16 out1:
137 63 out0:
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 63 return bits & 1 ? AVERROR_INVALIDDATA : out ? dst - out : 0;
139 }
140
141 /*****************************************************************************
142 * b64_encode: Stolen from VLC's http.c.
143 * Simplified by Michael.
144 * Fixed edge cases and made it work from data (vs. strings) by Ryan.
145 *****************************************************************************/
146
147 23 char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
148 {
149 static const char b64[] =
150 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
151 char *ret, *dst;
152 23 unsigned i_bits = 0;
153 23 int i_shift = 0;
154 23 int bytes_remaining = in_size;
155
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 23 if (in_size >= UINT_MAX / 4 ||
157
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 23 out_size < AV_BASE64_SIZE(in_size))
158 ✗ return NULL;
159 23 ret = dst = out;
160
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 154 while (bytes_remaining > 3) {
161 131 i_bits = AV_RB32(in);
162 131 in += 3; bytes_remaining -= 3;
163 131 *dst++ = b64[ i_bits>>26 ];
164 131 *dst++ = b64[(i_bits>>20) & 0x3F];
165 131 *dst++ = b64[(i_bits>>14) & 0x3F];
166 131 *dst++ = b64[(i_bits>>8 ) & 0x3F];
167 }
168 23 i_bits = 0;
169
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 58 while (bytes_remaining) {
170 35 i_bits = (i_bits << 8) + *in++;
171 35 bytes_remaining--;
172 35 i_shift += 8;
173 }
174
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 80 while (i_shift > 0) {
175 57 *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
176 57 i_shift -= 6;
177 }
178
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 54 while ((dst - ret) & 3)
179 31 *dst++ = '=';
180 23 *dst = '\0';
181
182 23 return ret;
183 }
184