46 lines
957 B
C++
46 lines
957 B
C++
#pragma once
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namespace nall { namespace Decode {
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inline auto Base64(const string& text) -> vector<uint8_t> {
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auto value = [](char n) -> uint8_t {
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if(n >= 'A' && n <= 'Z') return n - 'A' + 0;
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if(n >= 'a' && n <= 'z') return n - 'a' + 26;
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if(n >= '0' && n <= '9') return n - '0' + 52;
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if(n == '+' || n == '-') return 62;
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if(n == '/' || n == '_') return 63;
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return 64; //error code
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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(unsigned i = 0; i < text.size(); i++) {
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uint8_t buffer = value(text[i]);
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if(buffer > 63) break;
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switch(i & 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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return result;
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}
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}}
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