128 lines
5.7 KiB
C++
128 lines
5.7 KiB
C++
#pragma once
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#include <cstring>
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#include <string>
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#include <vector>
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#include <cstdint>
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namespace FastNoise
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{
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/** https://gist.github.com/tomykaira/f0fd86b6c73063283afe550bc5d77594
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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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namespace Base64
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{
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static std::string Encode( const std::vector<uint8_t>& data )
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{
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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 in_len = data.size();
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size_t out_len = 4 * ((in_len + 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 < in_len - 2; i += 3 )
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{
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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 < in_len )
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{
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*p++ = sEncodingTable[(data[i] >> 2) & 0x3F];
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if( i == (in_len - 1) )
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{
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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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{
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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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static std::vector<uint8_t> Decode( const char* input )
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{
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static constexpr unsigned char kDecodingTable[] = {
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
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64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
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64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
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64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
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};
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size_t in_len = std::strlen( input );
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if( in_len % 4 != 0 ) return {};
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size_t out_len = in_len / 4 * 3;
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if( input[in_len - 1] == '=' ) out_len--;
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if( input[in_len - 2] == '=' ) out_len--;
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std::vector<uint8_t> out( out_len );
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for( size_t i = 0, j = 0; i < in_len; )
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{
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uint32_t a = input[i] == '=' ? 0 & i++ : kDecodingTable[static_cast<int>(input[i++])];
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uint32_t b = input[i] == '=' ? 0 & i++ : kDecodingTable[static_cast<int>(input[i++])];
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uint32_t c = input[i] == '=' ? 0 & i++ : kDecodingTable[static_cast<int>(input[i++])];
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uint32_t d = input[i] == '=' ? 0 & i++ : kDecodingTable[static_cast<int>(input[i++])];
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uint32_t triple = (a << 3 * 6) + (b << 2 * 6) + (c << 1 * 6) + (d << 0 * 6);
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if( j < out_len ) out[j++] = (triple >> 2 * 8) & 0xFF;
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if( j < out_len ) out[j++] = (triple >> 1 * 8) & 0xFF;
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if( j < out_len ) out[j++] = (triple >> 0 * 8) & 0xFF;
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}
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return out;
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}
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};
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}
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