1 /*
2 * DISTRHO Plugin Framework (DPF)
3 * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
6 * or without fee is hereby granted, provided that the above copyright notice and this
7 * permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #ifndef DISTRHO_BASE64_HPP_INCLUDED
18 #define DISTRHO_BASE64_HPP_INCLUDED
19
20 #include "../DistrhoUtils.hpp"
21
22 #include <cctype>
23 #include <vector>
24
25 // -----------------------------------------------------------------------
26 // base64 stuff, based on http://www.adp-gmbh.ch/cpp/common/base64.html
27
28 /*
29 Copyright (C) 2004-2008 René Nyffenegger
30
31 This source code is provided 'as-is', without any express or implied
32 warranty. In no event will the author be held liable for any damages
33 arising from the use of this software.
34
35 Permission is granted to anyone to use this software for any purpose,
36 including commercial applications, and to alter it and redistribute it
37 freely, subject to the following restrictions:
38
39 1. The origin of this source code must not be misrepresented; you must not
40 claim that you wrote the original source code. If you use this source code
41 in a product, an acknowledgment in the product documentation would be
42 appreciated but is not required.
43
44 2. Altered source versions must be plainly marked as such, and must not be
45 misrepresented as being the original source code.
46
47 3. This notice may not be removed or altered from any source distribution.
48
49 René Nyffenegger rene.nyffenegger@adp-gmbh.ch
50 */
51
52 // -----------------------------------------------------------------------
53 // Helpers
54
55 #ifndef DOXYGEN
56 namespace DistrhoBase64Helpers {
57
58 static const char* const kBase64Chars =
59 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
60 "abcdefghijklmnopqrstuvwxyz"
61 "0123456789+/";
62
63 static inline
findBase64CharIndex(const char c)64 uint8_t findBase64CharIndex(const char c)
65 {
66 static const uint8_t kBase64CharsLen(static_cast<uint8_t>(std::strlen(kBase64Chars)));
67
68 for (uint8_t i=0; i<kBase64CharsLen; ++i)
69 {
70 if (kBase64Chars[i] == c)
71 return i;
72 }
73
74 d_stderr2("findBase64CharIndex('%c') - failed", c);
75 return 0;
76 }
77
78 static inline
isBase64Char(const char c)79 bool isBase64Char(const char c)
80 {
81 return (std::isalnum(c) || (c == '+') || (c == '/'));
82 }
83
84 } // namespace DistrhoBase64Helpers
85 #endif
86
87 // -----------------------------------------------------------------------
88
89 static inline
d_getChunkFromBase64String(const char * const base64string)90 std::vector<uint8_t> d_getChunkFromBase64String(const char* const base64string)
91 {
92 DISTRHO_SAFE_ASSERT_RETURN(base64string != nullptr, std::vector<uint8_t>());
93
94 uint i=0, j=0;
95 uint charArray3[3], charArray4[4];
96
97 std::vector<uint8_t> ret;
98 ret.reserve(std::strlen(base64string)*3/4 + 4);
99
100 for (std::size_t l=0, len=std::strlen(base64string); l<len; ++l)
101 {
102 const char c = base64string[l];
103
104 if (c == '\0' || c == '=')
105 break;
106 if (c == ' ' || c == '\n')
107 continue;
108
109 DISTRHO_SAFE_ASSERT_CONTINUE(DistrhoBase64Helpers::isBase64Char(c));
110
111 charArray4[i++] = static_cast<uint>(c);
112
113 if (i == 4)
114 {
115 for (i=0; i<4; ++i)
116 charArray4[i] = DistrhoBase64Helpers::findBase64CharIndex(static_cast<char>(charArray4[i]));
117
118 charArray3[0] = (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4);
119 charArray3[1] = ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2);
120 charArray3[2] = ((charArray4[2] & 0x3) << 6) + charArray4[3];
121
122 for (i=0; i<3; ++i)
123 ret.push_back(static_cast<uint8_t>(charArray3[i]));
124
125 i = 0;
126 }
127 }
128
129 if (i != 0)
130 {
131 for (j=0; j<i && j<4; ++j)
132 charArray4[j] = DistrhoBase64Helpers::findBase64CharIndex(static_cast<char>(charArray4[j]));
133
134 for (j=i; j<4; ++j)
135 charArray4[j] = 0;
136
137 charArray3[0] = (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4);
138 charArray3[1] = ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2);
139 charArray3[2] = ((charArray4[2] & 0x3) << 6) + charArray4[3];
140
141 for (j=0; i>0 && j<i-1; j++)
142 ret.push_back(static_cast<uint8_t>(charArray3[j]));
143 }
144
145 return ret;
146 }
147
148 // -----------------------------------------------------------------------
149
150 #endif // DISTRHO_BASE64_HPP_INCLUDED
151