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// Copyright (c) Glyn Matthews 2011-2016.
// Copyright 2012 Dean Michael Berris <dberris@google.com>
// Copyright 2012 Google, Inc.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef NETWORK_URI_DECODE_INC
#define NETWORK_URI_DECODE_INC
#include <network/uri/uri_errors.hpp>
#include <iterator>
#include <cassert>
namespace network {
namespace detail {
template <typename CharT>
CharT letter_to_hex(CharT in) {
if ((in >= '0') && (in <= '9')) {
return in - '0';
}
if ((in >= 'a') && (in <= 'f')) {
return in + 10 - 'a';
}
if ((in >= 'A') && (in <= 'F')) {
return in + 10 - 'A';
}
throw percent_decoding_error(uri_error::non_hex_input);
}
template <class InputIterator, class charT>
InputIterator decode_char(InputIterator it, charT *out) {
assert(*it == '%');
++it;
auto h0 = *it;
auto v0 = detail::letter_to_hex(h0);
++it;
auto h1 = *it;
auto v1 = detail::letter_to_hex(h1);
++it;
*out = static_cast<charT>((0x10 * v0) + v1);
return it;
}
template <class InputIterator, class OutputIterator>
OutputIterator decode(InputIterator in_begin, InputIterator in_end,
OutputIterator out_begin) {
auto it = in_begin;
auto out = out_begin;
while (it != in_end) {
if (*it == '%') {
if (std::distance(it, in_end) < 3) {
throw percent_decoding_error(uri_error::not_enough_input);
}
char c = '\0';
it = decode_char(it, &c);
*out = c;
++out;
} else {
*out++ = *it++;
}
}
return out;
}
template <class String>
String decode(const String &source) {
String unencoded;
decode(std::begin(source), std::end(source), std::back_inserter(unencoded));
return unencoded;
}
} // namespace detail
} // namespace network
#endif // NETWORK_URI_DECODE_INC
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