49 lines
1,010 B
C++
49 lines
1,010 B
C++
#pragma once
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#include "stdafx.h"
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class Base64
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{
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public:
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static string Encode(const vector<uint8_t> data)
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{
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std::string out;
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int val = 0, valb = -6;
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for (uint8_t c : data)
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{
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val = (val << 8) + c;
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valb += 8;
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while (valb >= 0)
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{
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out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[(val >> valb) & 0x3F]);
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valb -= 6;
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}
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}
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if (valb > -6) out.push_back(
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[((val << 8) >> (valb + 8)) & 0x3F]);
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while (out.size() % 4) out.push_back('=');
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return out;
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}
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static vector<uint8_t> Decode(string in)
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{
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vector<uint8_t> out;
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vector<int> T(256, -1);
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for (int i = 0; i < 64; i++) T["ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i]] = i;
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int val = 0, valb = -8;
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for (uint8_t c : in)
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{
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if (T[c] == -1) break;
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val = (val << 6) + T[c];
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valb += 6;
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if (valb >= 0)
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{
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out.push_back(val >> valb);
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valb -= 8;
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}
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}
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return out;
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}
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};
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