/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ultima/ultima8/misc/debugger.h"
#include "ultima/ultima8/usecode/byte_set.h"

namespace Ultima {
namespace Ultima8 {

ByteSet::ByteSet() : _size(0), _data(nullptr) {
}


ByteSet::ByteSet(unsigned int size) : _data(nullptr) {
	setSize(size);
}

ByteSet::~ByteSet() {
	delete[] _data;
}

void ByteSet::setSize(unsigned int size) {
	if (_data) delete[] _data;

	_size = size;
	_data = new uint8[_size];
	for (unsigned int i = 0; i < _size; ++i)
		_data[i] = 0;
}

uint32 ByteSet::getEntries(unsigned int pos, unsigned int n) const {
	assert(n <= 2);
	assert(pos + n <= _size);
	if (n == 0) return 0;

	if (n == 1) {
		return _data[pos];
	} else if (n == 2) {
		return (_data[pos] << 8) | _data[pos + 1];
	}
	return 0;
}

void ByteSet::setEntries(unsigned int pos, unsigned int n, uint32 val) {
	assert(n <= 2);
	assert(pos + n <= _size);
	if (n == 0) return;

	if (n == 1) {
		_data[pos] = static_cast<uint8>(val);
	} else if (n == 2) {
		_data[pos] = static_cast<uint8>((val & 0xFF00) >> 8);
		_data[pos + 1] = static_cast<uint8>(val & 0xFF);
	}
}

void ByteSet::save(Common::WriteStream *ws) {
	ws->writeUint32LE(_size);
	ws->write(_data, _size);
}

bool ByteSet::load(Common::ReadStream *rs, uint32 version) {
	uint32 s = rs->readUint32LE();

	if (s > 1024 * 1024) {
		warning("Improbable globals size %d, corrupt save?", s);
		return false;
	}

	setSize(s);
	rs->read(_data, _size);

	return true;
}

} // End of namespace Ultima8
} // End of namespace Ultima
