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/* 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
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