old-nall/decode/url.hpp

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2016-05-15 10:42:10 +00:00
#pragma once
namespace nall { namespace Decode {
//returns empty string on malformed content
inline auto URL(const string& input) -> string {
string output;
for(unsigned n = 0; n < input.size();) {
char c = input[n];
if(c >= 'A' && c <= 'Z') { output.append(c); n++; continue; }
if(c >= 'a' && c <= 'z') { output.append(c); n++; continue; }
if(c >= '0' && c <= '9') { output.append(c); n++; continue; }
if(c == '-' || c == '_' || c == '.' || c == '~') { output.append(c); n++; continue; }
if(c == '+') { output.append(' '); n++; continue; }
if(c != '%' || n + 2 >= input.size()) return "";
char hi = input[n + 1];
char lo = input[n + 2];
if(hi >= '0' && hi <= '9') hi -= '0';
else if(hi >= 'A' && hi <= 'F') hi -= 'A' - 10;
else if(hi >= 'a' && hi <= 'f') hi -= 'a' - 10;
else return "";
if(lo >= '0' && lo <= '9') lo -= '0';
else if(lo >= 'A' && lo <= 'F') lo -= 'A' - 10;
else if(lo >= 'a' && lo <= 'f') lo -= 'a' - 10;
else return "";
char byte = hi * 16 + lo;
output.append(byte);
n += 3;
}
return output;
}
}}