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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.
*
*/
/*
* This code is based on original Soltys source code
* Copyright (c) 1994-1995 Janus B. Wisniewski and L.K. Avalon
*/
#ifndef __CGE_BTFILE__
#define __CGE_BTFILE__
#include "cge/general.h"
namespace CGE {
#define kBtSize 1024
#define kBtKeySize 13
#define kBtLevel 2
#define kBtValNone 0xFFFF
#define kBtValRoot 0
#include "common/pack-start.h" // START STRUCT PACKING
struct BtKeypack {
char _key[kBtKeySize];
uint32 _mark;
uint16 _size;
};
struct Inner {
uint8 _key[kBtKeySize];
uint16 _down;
};
struct Hea {
uint16 _count;
uint16 _down;
};
struct BtPage {
Hea _hea;
union {
// dummy filler to make proper size of union
uint8 _data[kBtSize - sizeof(Hea)];
// inner version of data: key + word-sized page link
Inner _inn[(kBtSize - sizeof(Hea)) / sizeof(Inner)];
// leaf version of data: key + all user data
BtKeypack _lea[(kBtSize - sizeof(Hea)) / sizeof(BtKeypack)];
};
};
#include "common/pack-end.h" // END STRUCT PACKING
class BtFile : public IoHand {
struct {
BtPage *_page;
uint16 _pgNo;
int _indx;
bool _updt;
} _buff[kBtLevel];
void putPage(int lev, bool hard);
BtPage *getPage(int lev, uint16 pgn);
public:
BtFile(const char *name, IOMode mode, CRYPT *crpt);
virtual ~BtFile();
BtKeypack *find(const char *key);
BtKeypack *next();
void make(BtKeypack *keypack, uint16 count);
};
} // End of namespace CGE
#endif
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