#include <codecvt>

#include <arpa/inet.h>

class JavaPropertiesUnescapingINIContentHandler : public UnescapingINIContentHandler {

private:

	wstring_convert < codecvt_utf8<wchar_t>> convertor; // INI parser works with UTF-8

	bool readHex(const char* hexadecimal, size_t hexLength, uint8_t* resultBuffer, size_t binLength) {

		if (hexLength != binLength * 2) return false;

		for (size_t i = 0; i < binLength; i++) {

			uint8_t value = 0;

			char a = hexadecimal[i * 2];

			char b = hexadecimal[i * 2 + 1];

			if (a >= '0' && a <= '9') value += (a - '0')*16;

			else if (a >= 'a' && a <= 'f') value += (a - 'a' + 10)*16;

			else if (a >= 'A' && a <= 'F') value += (a - 'A' + 10)*16;

			else return false;

			if (b >= '0' && b <= '9') value += b - '0';

			else if (b >= 'a' && b <= 'f') value += b - 'a' + 10;

			else if (b >= 'A' && b <= 'F') value += b - 'A' + 10;

			else return false;

			if (resultBuffer) resultBuffer[i] = value;

		}

		return true;

	}

				if (ch == 'u') {

					// TODO: simplify, clean-up, verify (but seems working)

					i++;

					int hexLength = 4;

					if (i + hexLength < length) {

						uint16_t u16;

						bool hexOK = readHex(s.c_str() + i + 1, hexLength, (uint8_t*) & u16, sizeof (u16));

						if (hexOK) result << convertor.to_bytes(ntohs(u16));

						else throw std::logic_error(std::string("Invalid unicode escape sequence: invalid HEX"));

						i += hexLength;

					} else {

						throw std::logic_error(std::string("Invalid unicode escape sequence: missing characters"));

					}

				} else if (ch == ESC && !lastEscaphingPhase) put(result, ESC, i).put(ESC); // copy and skip even the second \ to avoid its misinterpretation in the next cycle

	JavaPropertiesUnescapingINIContentHandler(INIContentHandler& output, bool lastEscaphingPhase) : UnescapingINIContentHandler(output, lastEscaphingPhase) {