/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#include "kyra/util.h"

namespace Kyra {

int Util::decodeString1(const char *src, char *dst) {
	static const uint8 decodeTable1[] = {
		0x20, 0x65, 0x74, 0x61, 0x69, 0x6E, 0x6F, 0x73, 0x72, 0x6C, 0x68,
		0x63, 0x64, 0x75, 0x70, 0x6D
	};

	static const uint8 decodeTable2[] = {
		0x74, 0x61, 0x73, 0x69, 0x6F, 0x20, 0x77, 0x62, 0x20, 0x72, 0x6E,
		0x73, 0x64, 0x61, 0x6C, 0x6D, 0x68, 0x20, 0x69, 0x65, 0x6F, 0x72,
		0x61, 0x73, 0x6E, 0x72, 0x74, 0x6C, 0x63, 0x20, 0x73, 0x79, 0x6E,
		0x73, 0x74, 0x63, 0x6C, 0x6F, 0x65, 0x72, 0x20, 0x64, 0x74, 0x67,
		0x65, 0x73, 0x69, 0x6F, 0x6E, 0x72, 0x20, 0x75, 0x66, 0x6D, 0x73,
		0x77, 0x20, 0x74, 0x65, 0x70, 0x2E, 0x69, 0x63, 0x61, 0x65, 0x20,
		0x6F, 0x69, 0x61, 0x64, 0x75, 0x72, 0x20, 0x6C, 0x61, 0x65, 0x69,
		0x79, 0x6F, 0x64, 0x65, 0x69, 0x61, 0x20, 0x6F, 0x74, 0x72, 0x75,
		0x65, 0x74, 0x6F, 0x61, 0x6B, 0x68, 0x6C, 0x72, 0x20, 0x65, 0x69,
		0x75, 0x2C, 0x2E, 0x6F, 0x61, 0x6E, 0x73, 0x72, 0x63, 0x74, 0x6C,
		0x61, 0x69, 0x6C, 0x65, 0x6F, 0x69, 0x72, 0x61, 0x74, 0x70, 0x65,
		0x61, 0x6F, 0x69, 0x70, 0x20, 0x62, 0x6D
	};

	int size = 0;
	uint cChar = 0;
	while ((cChar = *src++) != 0) {
		if (cChar & 0x80) {
			cChar &= 0x7F;
			int index = (cChar & 0x78) >> 3;
			*dst++ = decodeTable1[index];
			++size;
			assert(cChar < sizeof(decodeTable2));
			cChar = decodeTable2[cChar];
		}

		*dst++ = cChar;
		++size;
	}

	*dst++ = 0;
	return size;
}

void Util::decodeString2(const char *src, char *dst) {
	if (!src || !dst)
		return;

	char out = 0;
	while ((out = *src) != 0) {
		if (*src == 0x1B) {
			++src;
			out = *src + 0x7F;
		}
		*dst++ = out;
		++src;
	}

	*dst = 0;
}

} // end of namespace Kyra