34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
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#pragma once
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namespace nall { namespace Decode {
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//returns empty string on malformed content
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inline auto URL(const string& input) -> string {
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string output;
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for(unsigned n = 0; n < input.size();) {
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char c = input[n];
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if(c >= 'A' && c <= 'Z') { output.append(c); n++; continue; }
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if(c >= 'a' && c <= 'z') { output.append(c); n++; continue; }
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if(c >= '0' && c <= '9') { output.append(c); n++; continue; }
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if(c == '-' || c == '_' || c == '.' || c == '~') { output.append(c); n++; continue; }
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if(c == '+') { output.append(' '); n++; continue; }
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if(c != '%' || n + 2 >= input.size()) return "";
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char hi = input[n + 1];
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char lo = input[n + 2];
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if(hi >= '0' && hi <= '9') hi -= '0';
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else if(hi >= 'A' && hi <= 'F') hi -= 'A' - 10;
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else if(hi >= 'a' && hi <= 'f') hi -= 'a' - 10;
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else return "";
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if(lo >= '0' && lo <= '9') lo -= '0';
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else if(lo >= 'A' && lo <= 'F') lo -= 'A' - 10;
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else if(lo >= 'a' && lo <= 'f') lo -= 'a' - 10;
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else return "";
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char byte = hi * 16 + lo;
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output.append(byte);
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n += 3;
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}
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return output;
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}
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}}
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