File size: 6,921 Bytes
985c397 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | // SPDX-License-Identifier: Zlib
/*
base64.cpp and base64.h
Copyright (C) 2004-2008 René Nyffenegger
This source code is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this source code must not be misrepresented; you must not
claim that you wrote the original source code. If you use this source code
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original source code.
3. This notice may not be removed or altered from any source distribution.
René Nyffenegger rene.nyffenegger@adp-gmbh.ch
NOTICE: The source code here has been altered from the original to use a provided character buffer
rather than returning a new string for each call.
These modifications are Copyright (c) 2019 Zheng Lei (realthunder.dev@gmail.com)
*/
#include <array>
#include "Base64.h"
// NOLINTBEGIN(cppcoreguidelines-pro-bounds-pointer-arithmetic,
// cppcoreguidelines-pro-bounds-constant-array-index, cppcoreguidelines-avoid-magic-numbers,
// readability-magic-numbers)
static const std::array<char, 65> base64_chars {"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/"};
std::array<const signed char, Base::base64DecodeTableSize> Base::base64_decode_table()
{
static std::array<const signed char, Base::base64DecodeTableSize> _table = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -2, -1, -2, -1, -1, // 0-15
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 16-31
-2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, // 32-47
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1, // 48-63
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 64-79
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, // 80-95
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 96-111
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, // 112-127
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 128-143
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 144-159
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 160-175
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 176-191
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 192-207
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 208-223
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 224-239
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 // 240-255
};
return _table;
}
std::size_t Base::base64_encode(char* out, void const* in, std::size_t in_len)
{
char* ret = out;
auto const* bytes_to_encode = reinterpret_cast<unsigned char const*>(in); // NOLINT
int char3 {0};
int char4 {};
std::array<unsigned char, 3> char_array_3 {};
std::array<unsigned char, 4> char_array_4 {};
while ((in_len--) != 0U) {
char_array_3[char3++] = *(bytes_to_encode++);
if (char3 == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (char3 = 0; (char3 < 4); char3++) {
*ret++ = base64_chars[char_array_4[char3]];
}
char3 = 0;
}
}
if (char3 != 0) {
for (char4 = char3; char4 < 3; char4++) {
char_array_3[char4] = '\0';
}
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (char4 = 0; (char4 < char3 + 1); char4++) {
*ret++ = base64_chars[char_array_4[char4]];
}
while ((char3++ < 3)) {
*ret++ = '=';
}
}
return ret - out;
}
std::pair<std::size_t, std::size_t> Base::base64_decode(void* _out, char const* in, std::size_t in_len)
{
auto* out = reinterpret_cast<unsigned char*>(_out); // NOLINT
unsigned char* ret = out;
char const* input = in;
int byteCounter1 {0};
int byteCounter2 {};
std::array<unsigned char, 4> char_array_4 {};
std::array<unsigned char, 3> char_array_3 {};
static auto table = base64_decode_table();
while (((in_len--) != 0U) && *in != '=') {
const signed char lookup = table[static_cast<unsigned char>(*in++)];
if (lookup < 0) {
break;
}
char_array_4[byteCounter1++] = (unsigned char)lookup;
if (byteCounter1 == 4) {
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (byteCounter1 = 0; (byteCounter1 < 3); byteCounter1++) {
*ret++ = char_array_3[byteCounter1];
}
byteCounter1 = 0;
}
}
if (byteCounter1 != 0) {
for (byteCounter2 = byteCounter1; byteCounter2 < 4; byteCounter2++) {
char_array_4[byteCounter2] = 0;
}
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (byteCounter2 = 0; (byteCounter2 < byteCounter1 - 1); byteCounter2++) {
*ret++ = char_array_3[byteCounter2];
}
}
return std::make_pair((std::size_t)(ret - out), (std::size_t)(in - input));
}
// NOLINTEND(cppcoreguidelines-pro-bounds-pointer-arithmetic,
// cppcoreguidelines-pro-bounds-constant-array-index, cppcoreguidelines-avoid-magic-numbers,
// readability-magic-numbers)
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