135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ultima/ultima8/misc/debugger.h"
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#include "ultima/ultima8/usecode/bit_set.h"
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namespace Ultima {
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namespace Ultima8 {
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BitSet::BitSet() : _size(0), _bytes(0), _data(nullptr) {
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}
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BitSet::BitSet(unsigned int size) : _data(nullptr) {
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setSize(size);
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}
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BitSet::~BitSet() {
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delete[] _data;
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}
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void BitSet::setSize(unsigned int size) {
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if (_data) delete[] _data;
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_size = size;
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_bytes = _size / 8;
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if (_size % 8 != 0) _bytes++;
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_data = new uint8[_bytes];
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for (unsigned int i = 0; i < _bytes; ++i)
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_data[i] = 0;
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}
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uint32 BitSet::getEntries(unsigned int pos, unsigned int n) const {
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assert(n <= 32);
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assert(pos + n <= _size);
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if (n == 0) return 0;
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unsigned int firstbyte = pos / 8;
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unsigned int lastbyte = (pos + n - 1) / 8;
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if (firstbyte == lastbyte) {
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return ((_data[firstbyte] >> (pos % 8)) & ((1 << n) - 1));
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}
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unsigned int firstbits = 8 - (pos % 8);
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unsigned int lastbits = ((pos + n - 1) % 8) + 1;
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unsigned int firstmask = ((1 << firstbits) - 1) << (8 - firstbits);
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unsigned int lastmask = ((1 << lastbits) - 1);
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uint32 ret = 0;
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ret |= (_data[firstbyte] & firstmask) >> (8 - firstbits);
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unsigned int shift = firstbits;
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for (unsigned int i = firstbyte + 1; i < lastbyte; ++i) {
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ret |= (_data[i] << shift);
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shift += 8;
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}
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ret |= (_data[lastbyte] & lastmask) << shift;
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return ret;
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}
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void BitSet::setEntries(unsigned int pos, unsigned int n, uint32 bits) {
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assert(n <= 32);
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assert(pos + n <= _size);
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if (n == 0) return;
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unsigned int firstbyte = pos / 8;
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unsigned int lastbyte = (pos + n - 1) / 8;
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if (firstbyte == lastbyte) {
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_data[firstbyte] &= ~(((1 << n) - 1) << (pos % 8));
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_data[firstbyte] |= (bits & ((1 << n) - 1)) << (pos % 8);
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return;
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}
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unsigned int firstbits = 8 - (pos % 8);
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unsigned int lastbits = ((pos + n - 1) % 8) + 1;
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unsigned int firstmask = ((1 << firstbits) - 1) << (8 - firstbits);
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unsigned int lastmask = ((1 << lastbits) - 1);
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_data[firstbyte] &= ~firstmask;
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_data[firstbyte] |= (bits << (8 - firstbits)) & firstmask;
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unsigned int shift = firstbits;
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for (unsigned int i = firstbyte + 1; i < lastbyte; ++i) {
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_data[i] = (bits >> shift);
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shift += 8;
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}
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_data[lastbyte] &= ~lastmask;
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_data[lastbyte] |= (bits >> shift) & lastmask;
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}
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void BitSet::save(Common::WriteStream *ws) {
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ws->writeUint32LE(_size);
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ws->write(_data, _bytes);
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}
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bool BitSet::load(Common::ReadStream *rs, uint32 version) {
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uint32 s = rs->readUint32LE();
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if (s > 1024 * 1024) {
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warning("Improbable globals size %d, corrupt save?", s);
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return false;
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}
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setSize(s);
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rs->read(_data, _bytes);
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return true;
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}
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} // End of namespace Ultima8
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} // End of namespace Ultima
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