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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 GOB_VARIABLES_H
#define GOB_VARIABLES_H
namespace Gob {
class Variables {
public:
enum Type {
kVariableType8,
kVariableType16,
kVariableType32
};
Variables(uint32 size);
virtual ~Variables();
uint32 getSize() const;
void writeVar8(uint32 var, uint8 value);
void writeVar16(uint32 var, uint16 value);
void writeVar32(uint32 var, uint32 value);
void writeVarString(uint32 var, const char *value);
void writeOff8(uint32 offset, uint8 value);
void writeOff16(uint32 offset, uint16 value);
void writeOff32(uint32 offset, uint32 value);
void writeOffString(uint32 offset, const char *value);
uint8 readVar8(uint32 var) const;
uint16 readVar16(uint32 var) const;
uint32 readVar32(uint32 var) const;
void readVarString(uint32 var, char *value, uint32 length);
uint8 readOff8(uint32 offset) const;
uint16 readOff16(uint32 offset) const;
uint32 readOff32(uint32 offset) const;
void readOffString(uint32 offset, char *value, uint32 length);
const uint8 *getAddressVar8(uint32 var) const;
uint8 *getAddressVar8(uint32 var);
const char *getAddressVarString(uint32 var) const;
char *getAddressVarString(uint32 var);
const uint8 *getAddressOff8(uint32 offset) const;
uint8 *getAddressOff8(uint32 offset);
const char *getAddressOffString(uint32 offset) const;
char *getAddressOffString(uint32 offset);
bool copyTo(uint32 offset, byte *variables, uint32 n) const;
bool copyFrom(uint32 offset, const byte *variables, uint32 n);
protected:
virtual void write8(byte *buf, uint8 data) const = 0;
virtual void write16(byte *buf, uint16 data) const = 0;
virtual void write32(byte *buf, uint32 data) const = 0;
virtual uint8 read8(const byte *buf) const = 0;
virtual uint16 read16(const byte *buf) const = 0;
virtual uint32 read32(const byte *buf) const = 0;
private:
uint32 _size;
byte *_vars;
void clear();
};
class VariablesLE : public Variables {
public:
VariablesLE(uint32 size);
~VariablesLE();
protected:
void write8(byte *buf, uint8 data) const;
void write16(byte *buf, uint16 data) const;
void write32(byte *buf, uint32 data) const;
uint8 read8(const byte *buf) const;
uint16 read16(const byte *buf) const;
uint32 read32(const byte *buf) const;
};
class VariablesBE : public Variables {
public:
VariablesBE(uint32 size);
~VariablesBE();
protected:
void write8(byte *buf, uint8 data) const;
void write16(byte *buf, uint16 data) const;
void write32(byte *buf, uint32 data) const;
uint8 read8(const byte *buf) const;
uint16 read16(const byte *buf) const;
uint32 read32(const byte *buf) const;
};
class VariableReference {
public:
VariableReference();
VariableReference(Variables &vars, uint32 offset,
Variables::Type type = Variables::kVariableType32);
~VariableReference();
void set(Variables &vars, uint32 offset, Variables::Type type = Variables::kVariableType32);
VariableReference &operator=(uint32 value);
VariableReference &operator+=(uint32 value);
VariableReference &operator*=(uint32 value);
operator uint32();
private:
Variables *_vars;
uint32 _offset;
Variables::Type _type;
};
class VariableStack {
public:
VariableStack(uint32 size);
~VariableStack();
void pushData(const Variables &vars, uint32 offset, uint32 size);
void pushInt(uint32 value);
void pop(Variables &vars, uint32 offset);
private:
byte *_stack;
uint32 _size;
uint32 _position;
};
} // End of namespace Gob
#endif // GOB_VARIABLES_H
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