71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
#pragma once
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/**
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* The MIT License (MIT)
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* Copyright (c) 2016 tomykaira
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string>
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namespace macaron {
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class Base64 {
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public:
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static std::string Encode(const char* data, size_t length) {
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static constexpr char sEncodingTable[] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/'
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};
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size_t out_len = 4 * ((length + 2) / 3);
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std::string ret(out_len, '\0');
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size_t i;
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char* p = const_cast<char*>(ret.c_str());
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for (i = 0; i < length - 2; i += 3) {
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*p++ = sEncodingTable[(data[i] >> 2) & 0x3F];
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*p++ = sEncodingTable[((data[i] & 0x3) << 4) | ((int)(data[i + 1] & 0xF0) >> 4)];
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*p++ = sEncodingTable[((data[i + 1] & 0xF) << 2) | ((int)(data[i + 2] & 0xC0) >> 6)];
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*p++ = sEncodingTable[data[i + 2] & 0x3F];
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}
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if (i < length) {
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*p++ = sEncodingTable[(data[i] >> 2) & 0x3F];
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if (i == (length - 1)) {
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*p++ = sEncodingTable[((data[i] & 0x3) << 4)];
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*p++ = '=';
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}
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else {
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*p++ = sEncodingTable[((data[i] & 0x3) << 4) | ((int)(data[i + 1] & 0xF0) >> 4)];
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*p++ = sEncodingTable[((data[i + 1] & 0xF) << 2)];
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}
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*p++ = '=';
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}
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return ret;
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}
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};
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} |