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Diffstat (limited to 'engines/dreamweb/segment.h')
| -rw-r--r-- | engines/dreamweb/segment.h | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/engines/dreamweb/segment.h b/engines/dreamweb/segment.h new file mode 100644 index 0000000000..9464015478 --- /dev/null +++ b/engines/dreamweb/segment.h @@ -0,0 +1,227 @@ +/* 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. + * + */ + +#ifndef DREAMGEN_SEGMENT_H +#define DREAMGEN_SEGMENT_H + +#include "common/array.h" +#include "common/ptr.h" +#include "common/hashmap.h" +#include "common/list.h" + +namespace DreamGen { + +class WordRef { + uint8 *_data; + unsigned _index; + uint16 _value; + +public: + inline WordRef(Common::Array<uint8> &data, unsigned index) : _data(data.begin() + index), _index(index) { + assert(index + 1 < data.size()); + _value = _data[0] | (_data[1] << 8); + } + + inline WordRef& operator=(const WordRef &ref) { + _value = ref._value; + return *this; + } + + inline WordRef& operator=(uint16 v) { + _value = v; + return *this; + } + + inline operator uint16&() { + return _value; + } + + inline ~WordRef() { + _data[0] = _value & 0xff; + _data[1] = _value >> 8; + _value = _data[0] | (_data[1] << 8); + } +}; + +class Segment { + Common::Array<uint8> data; + +public: + Segment(uint size = 0) { + if (size > 0) + data.resize(size); + } + + inline void assign(const uint8 *b, const uint8 *e) { + data.assign(b, e); + } + + inline uint8 &byte(unsigned index) { + assert(index < data.size()); + return data[index]; + } + + inline WordRef word(unsigned index) { + return WordRef(data, index); + } + + inline uint8 *ptr(unsigned index, unsigned size) { + assert(index + size <= data.size()); + return data.begin() + index; + } +}; + +typedef Common::SharedPtr<Segment> SegmentPtr; + +class SegmentRef { + uint16 _value; + SegmentPtr _segment; + +public: + SegmentRef(uint16 value = 0, SegmentPtr segment = SegmentPtr()) + : _value(value), _segment(segment) { + } + + inline operator uint16() const { + return _value; + } + + SegmentPtr getSegmentPtr() const { + return _segment; + } + + inline uint8 &byte(unsigned index) { + assert(_segment != 0); + return _segment->byte(index); + } + + inline WordRef word(unsigned index) { + //debug(1, "getting word ref for %04x:%d", _value, index); + assert(_segment != 0); + return _segment->word(index); + } + + inline void assign(const uint8 *b, const uint8 *e) { + assert(_segment != 0); + _segment->assign(b, e); + } + + inline uint8 *ptr(unsigned index, unsigned size) { + assert(_segment != 0); + return _segment->ptr(index, size); + } + +protected: + SegmentRef &operator=(const SegmentRef &seg) { + _value = seg._value; + _segment = seg._segment; + return *this; + } + +}; + +class SegmentManager; + +class MutableSegmentRef : public SegmentRef { +protected: + SegmentManager *_segMan; + +public: + MutableSegmentRef(SegmentManager *segMan, uint16 value = 0, SegmentPtr segment = SegmentPtr()) + : _segMan(segMan), SegmentRef(value, segment) { + } + + MutableSegmentRef(SegmentManager *segMan, SegmentRef seg) + : _segMan(segMan), SegmentRef(seg) { + } + + inline MutableSegmentRef& operator=(const uint16 id); + +}; + + +class SegmentManager { +private: + typedef Common::HashMap<uint16, SegmentPtr> SegmentMap; + SegmentMap _segments; + + typedef Common::List<uint16> FreeSegmentList; + FreeSegmentList _freeSegments; + + enum { kDefaultDataSegment = 0x1000 }; + +public: + + SegmentPtr _realData; ///< the primary data segment, points to a huge blob of binary data + SegmentRef data; ///< fake segment register always pointing to data segment + +public: + SegmentManager() : + _realData(new Segment()), + data(kDefaultDataSegment, _realData) { + + _segments[kDefaultDataSegment] = data.getSegmentPtr(); + } + + SegmentRef getSegment(uint16 value) { + SegmentMap::iterator i = _segments.find(value); + if (i != _segments.end()) + return SegmentRef(value, i->_value); + else + return SegmentRef(value); + } + + SegmentRef allocateSegment(uint size) { + unsigned id; + if (_freeSegments.empty()) + id = kDefaultDataSegment + _segments.size(); + else { + id = _freeSegments.front(); + _freeSegments.pop_front(); + } + assert(!_segments.contains(id)); + SegmentPtr seg(new Segment(size)); + _segments[id] = seg; + return SegmentRef(id, seg); + } + + void deallocateSegment(uint16 id) { + SegmentMap::iterator i = _segments.find(id); + if(i != _segments.end()) { + _segments.erase(i); + _freeSegments.push_back(id); + } else { + debug("Deallocating non existent segment! Client code should be fixed."); + } + } + +}; + + +inline MutableSegmentRef& MutableSegmentRef::operator=(const uint16 id) { + SegmentRef::operator=(_segMan->getSegment(id)); + return *this; +} + +} // End of namespace DreamGen + +#endif |