#include "quotedprintable.h"

QString &QuotedPrintable::encode(const QByteArray &input)
{
	QString *output = new QString();

	char byte;
	const char hex[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

	for (int i = 0; i < input.length() ; ++i) {
		byte = input.at(i);

		if ((byte == 0x20) || ((byte >= 33) && (byte <= 126) && (byte != 61))) {
			output->append(byte);
		} else {
			output->append('=');
			output->append(hex[((byte >> 4) & 0x0F)]);
			output->append(hex[(byte & 0x0F)]);
		}
	}

	return *output;
}


QByteArray &QuotedPrintable::decode(const QString &input)
{
	//                    0  1  2  3  4  5  6  7  8  9  :  ;  <  =  >  ?  @  A   B   C   D   E   F
	const int hexVal[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, 0, 10, 11, 12, 13, 14, 15};

	QByteArray *output = new QByteArray();

	for (int i = 0; i < input.length(); ++i) {
		if (input.at(i).toLatin1() == '=') {
			int index = ++i;
			output->append((hexVal[input.at(index).toLatin1() - '0'] << 4) + hexVal[input.at(++i).toLatin1() - '0']);
		} else {
			output->append(input.at(i).toLatin1());
		}
	}

	return *output;
}