mirror of https://github.com/bsnes-emu/bsnes.git
48 lines
1009 B
C++
48 lines
1009 B
C++
#pragma once
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namespace nall::Decode {
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inline auto Base64(const string& text) -> vector<uint8_t> {
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static bool initialized = false;
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static uint8_t lookup[256] = {0};
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if(!initialized) {
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initialized = true;
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for(uint n : range(26)) lookup['A' + n] = n;
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for(uint n : range(26)) lookup['a' + n] = n + 26;
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for(uint n : range(10)) lookup['0' + n] = n + 52;
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lookup['+'] = lookup['-'] = 62;
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lookup['/'] = lookup['_'] = 63;
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}
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vector<uint8_t> result;
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uint8_t buffer, output;
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for(uint n : range(text.size())) {
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uint8_t buffer = lookup[text[n]];
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switch(n & 3) {
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case 0:
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output = buffer << 2;
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break;
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case 1:
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result.append(output | buffer >> 4);
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output = (buffer & 15) << 4;
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break;
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case 2:
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result.append(output | buffer >> 2);
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output = (buffer & 3) << 6;
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break;
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case 3:
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result.append(output | buffer);
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break;
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}
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}
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if(text.size() & 3) result.append(output | buffer);
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return result;
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}
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}
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