// Represent
//
// Douglas Thrift
//
// $Id$

#include "Hexadecimal.hpp"

Hexadecimal::Hexadecimal(const ext::String& string, bool signed_) : Binary(string.GetSize() / 2, 0)
{
	if (string.IsEmpty())
	{
		bytes.InsertLast(0);

		return;
	}

	size_t index(string.GetSize() % 2), offset(index);

	_rforeach (ext::Vector<byte_t>, byte, bytes) _rfor (byte_t, half, 0, 2) *byte |= hex(string[index++]) << half * 4;

	if (offset != 0)
	{
		bytes.InsertLast(0);

		bytes.Last() |= hex(string[0]);
		bytes.Last() |= signed_ && bytes.Last() > 7 ? 0xF0 : 0;
	}
}

Hexadecimal::operator ext::String() const
{
	ext::String string;

	_rforeach (const ext::Vector<byte_t>, byte, bytes) _rfor (byte_t, half, 0, 2)
	{
		byte_t hex(0xF & *byte >> half * 4);

		if (hex < 0xA) hex += '0'; else hex += 'A' - 0xA;

		string.InsertLast(hex);
	}

	return string;
}

inline byte_t Hexadecimal::hex(const ext::CodePoint& atom)
{
	if (atom >= '0' && atom <= '9') return atom - '0'; else if (atom >= 'a' && atom <= 'f') return atom - 'a' + 0xA; else if (atom >= 'A' && atom <= 'F') return atom - 'A' + 0xA; else return 0;
}