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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/Base64.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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3
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
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4 *
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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6 * or without fee is hereby granted, provided that the above copyright notice and this
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7 * permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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15 */
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16
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17 #ifndef DISTRHO_BASE64_HPP_INCLUDED
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18 #define DISTRHO_BASE64_HPP_INCLUDED
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19
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20 #include "../DistrhoUtils.hpp"
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21
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22 #include <cctype>
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23 #include <vector>
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24
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25 // -----------------------------------------------------------------------
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26 // base64 stuff, based on http://www.adp-gmbh.ch/cpp/common/base64.html
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27
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28 /*
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29 Copyright (C) 2004-2008 René Nyffenegger
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30
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31 This source code is provided 'as-is', without any express or implied
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32 warranty. In no event will the author be held liable for any damages
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33 arising from the use of this software.
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34
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35 Permission is granted to anyone to use this software for any purpose,
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36 including commercial applications, and to alter it and redistribute it
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37 freely, subject to the following restrictions:
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38
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39 1. The origin of this source code must not be misrepresented; you must not
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40 claim that you wrote the original source code. If you use this source code
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41 in a product, an acknowledgment in the product documentation would be
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42 appreciated but is not required.
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43
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44 2. Altered source versions must be plainly marked as such, and must not be
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45 misrepresented as being the original source code.
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46
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47 3. This notice may not be removed or altered from any source distribution.
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48
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49 René Nyffenegger rene.nyffenegger@adp-gmbh.ch
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50 */
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51
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52 // -----------------------------------------------------------------------
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53 // Helpers
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54
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55 #ifndef DOXYGEN
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56 namespace DistrhoBase64Helpers {
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57
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58 static const char* const kBase64Chars =
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59 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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60 "abcdefghijklmnopqrstuvwxyz"
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61 "0123456789+/";
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62
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63 static inline
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64 uint8_t findBase64CharIndex(const char c)
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65 {
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66 static const uint8_t kBase64CharsLen(static_cast<uint8_t>(std::strlen(kBase64Chars)));
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67
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68 for (uint8_t i=0; i<kBase64CharsLen; ++i)
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69 {
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70 if (kBase64Chars[i] == c)
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71 return i;
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72 }
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73
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74 d_stderr2("findBase64CharIndex('%c') - failed", c);
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75 return 0;
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76 }
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77
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78 static inline
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79 bool isBase64Char(const char c)
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80 {
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81 return (std::isalnum(c) || (c == '+') || (c == '/'));
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82 }
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83
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84 } // namespace DistrhoBase64Helpers
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85 #endif
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86
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87 // -----------------------------------------------------------------------
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88
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89 static inline
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90 std::vector<uint8_t> d_getChunkFromBase64String(const char* const base64string)
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91 {
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92 DISTRHO_SAFE_ASSERT_RETURN(base64string != nullptr, std::vector<uint8_t>());
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93
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94 uint i=0, j=0;
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95 uint charArray3[3], charArray4[4];
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96
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97 std::vector<uint8_t> ret;
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98 ret.reserve(std::strlen(base64string)*3/4 + 4);
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99
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100 for (std::size_t l=0, len=std::strlen(base64string); l<len; ++l)
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101 {
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102 const char c = base64string[l];
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103
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104 if (c == '\0' || c == '=')
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105 break;
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106 if (c == ' ' || c == '\n')
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107 continue;
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108
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109 DISTRHO_SAFE_ASSERT_CONTINUE(DistrhoBase64Helpers::isBase64Char(c));
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110
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111 charArray4[i++] = static_cast<uint>(c);
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112
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113 if (i == 4)
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114 {
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115 for (i=0; i<4; ++i)
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116 charArray4[i] = DistrhoBase64Helpers::findBase64CharIndex(static_cast<char>(charArray4[i]));
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117
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118 charArray3[0] = (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4);
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119 charArray3[1] = ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2);
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120 charArray3[2] = ((charArray4[2] & 0x3) << 6) + charArray4[3];
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
121
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
122 for (i=0; i<3; ++i)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
123 ret.push_back(static_cast<uint8_t>(charArray3[i]));
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
124
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
125 i = 0;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
126 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
127 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
128
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
129 if (i != 0)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
130 {
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
131 for (j=0; j<i && j<4; ++j)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
132 charArray4[j] = DistrhoBase64Helpers::findBase64CharIndex(static_cast<char>(charArray4[j]));
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
133
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
134 for (j=i; j<4; ++j)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
135 charArray4[j] = 0;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
136
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
137 charArray3[0] = (charArray4[0] << 2) + ((charArray4[1] & 0x30) >> 4);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
138 charArray3[1] = ((charArray4[1] & 0xf) << 4) + ((charArray4[2] & 0x3c) >> 2);
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
139 charArray3[2] = ((charArray4[2] & 0x3) << 6) + charArray4[3];
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
140
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
141 for (j=0; i>0 && j<i-1; j++)
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
142 ret.push_back(static_cast<uint8_t>(charArray3[j]));
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
143 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
144
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
145 return ret;
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
146 }
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
147
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
148 // -----------------------------------------------------------------------
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
149
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
150 #endif // DISTRHO_BASE64_HPP_INCLUDED