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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 __BTFILE__
#define __BTFILE__
#include "cge/general.h"
namespace CGE {
#define BT_SIZE K(1)
#define BT_KEYLEN 13
#define BT_LEVELS 2
#define BT_NONE 0xFFFF
#define BT_ROOT 0
struct BT_KEYPACK {
char Key[BT_KEYLEN];
uint32 Mark;
uint16 Size;
};
struct BT_PAGE {
struct HEA {
uint16 Count;
uint16 Down;
} Hea;
union {
// dummy filler to make proper size of union
uint8 Data[BT_SIZE - sizeof(HEA)];
// inner version of data: key + word-sized page link
struct INNER {
uint8 Key[BT_KEYLEN];
uint16 Down;
} Inn[(BT_SIZE - sizeof(HEA)) / sizeof(INNER)];
// leaf version of data: key + all user data
BT_KEYPACK Lea[(BT_SIZE - sizeof(HEA)) / sizeof(BT_KEYPACK)];
};
};
class BTFILE : public IOHAND {
struct {
BT_PAGE *Page;
uint16 PgNo;
int Indx;
bool Updt;
} Buff[BT_LEVELS];
void PutPage(int lev, bool hard = FALSE);
BT_PAGE *GetPage(int lev, uint16 pgn);
public:
BTFILE(const char *name, IOMODE mode = REA, CRYPT *crpt = NULL);
virtual ~BTFILE(void);
BT_KEYPACK *Find(const char *key);
BT_KEYPACK *Next(void);
void Make(BT_KEYPACK *keypack, uint16 count);
};
} // End of namespace CGE
#endif
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