uriencode.cpp

#include <sstream>

#include <boost/utility/string_view.hpp>
#include "../../exception.hpp"

namespace s3::api::misc
{
	inline char digit_to_upper_hex_letter(const char ch)
	{
		return (ch >= 10) ? ('A' - 10 + ch) : ('0' + ch);
	}

	template <bool EncodeSlash>
		inline void uriencode_char(const char ch, std::ostringstream &oss);

	template <>
		inline void uriencode_char<true>(const char ch, std::ostringstream &oss)
		{
			if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '_' || ch == '-' || ch == '~' || ch == '.') {
				oss << ch;
			} else {
				oss << '%';
				oss << digit_to_upper_hex_letter((ch >> 4) & 0x0f);
				oss << digit_to_upper_hex_letter(ch & 0x0f);
			}
		}

	template <>
		inline void uriencode_char<false>(const char ch, std::ostringstream &oss)
		{
			if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '_' || ch == '-' || ch == '~' || ch == '.'
					|| ch == '/') {
				oss << ch;
			} else {
				oss << '%';
				oss << digit_to_upper_hex_letter((ch >> 4) & 0x0f);
				oss << digit_to_upper_hex_letter(ch & 0x0f);
			}
		}

	template <bool EncodeSlash=true>
		inline std::string uriencode(boost::string_view input)
		{
			std::ostringstream oss{};
			for(const char ch : input)
			{
				uriencode_char<EncodeSlash>(ch, oss);
			}
			return oss.str();
		}
}