2011-06-11 07:33:17 +00:00
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/*
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* This code is based on original Soltys source code
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* Copyright (c) 1994-1995 Janus B. Wisniewski and L.K. Avalon
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*/
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2011-06-13 09:57:24 +00:00
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#ifndef __BTFILE__
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#define __BTFILE__
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2011-06-11 07:33:17 +00:00
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2011-06-13 09:57:24 +00:00
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#include "cge/general.h"
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2011-06-11 07:33:17 +00:00
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namespace CGE {
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2011-06-13 09:57:24 +00:00
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#define BT_SIZE K(1)
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#define BT_KEYLEN 13
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#define BT_LEVELS 2
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2011-06-11 07:33:17 +00:00
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2011-06-13 09:57:24 +00:00
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#define BT_NONE 0xFFFF
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#define BT_ROOT 0
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2011-06-11 07:33:17 +00:00
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2011-06-26 08:51:12 +00:00
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#include "common/pack-start.h" // START STRUCT PACKING
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2011-06-11 07:33:17 +00:00
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2011-06-13 09:57:24 +00:00
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struct BT_KEYPACK {
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char Key[BT_KEYLEN];
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uint32 Mark;
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uint16 Size;
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2011-06-11 07:33:17 +00:00
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};
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2011-06-19 05:59:37 +00:00
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typedef struct {
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uint8 Key[BT_KEYLEN];
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uint16 Down;
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} INNER;
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2011-06-11 07:33:17 +00:00
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2011-06-13 09:57:24 +00:00
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struct BT_PAGE {
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struct HEA {
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uint16 Count;
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uint16 Down;
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} Hea;
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union {
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// dummy filler to make proper size of union
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uint8 Data[BT_SIZE - sizeof(HEA)];
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// inner version of data: key + word-sized page link
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2011-06-19 05:59:37 +00:00
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INNER Inn[(BT_SIZE - sizeof(HEA)) / sizeof(INNER)];
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2011-06-13 09:57:24 +00:00
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// leaf version of data: key + all user data
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BT_KEYPACK Lea[(BT_SIZE - sizeof(HEA)) / sizeof(BT_KEYPACK)];
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};
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2011-06-11 07:33:17 +00:00
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};
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2011-06-26 08:51:12 +00:00
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#include "common/pack-end.h" // END STRUCT PACKING
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2011-06-11 07:33:17 +00:00
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2011-06-13 09:57:24 +00:00
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class BTFILE : public IOHAND {
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struct {
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BT_PAGE *Page;
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uint16 PgNo;
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int Indx;
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bool Updt;
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} Buff[BT_LEVELS];
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2011-06-18 06:54:22 +00:00
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void PutPage(int lev, bool hard = false);
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2011-06-13 09:57:24 +00:00
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BT_PAGE *GetPage(int lev, uint16 pgn);
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2011-06-11 07:33:17 +00:00
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public:
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2011-06-13 09:57:24 +00:00
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BTFILE(const char *name, IOMODE mode = REA, CRYPT *crpt = NULL);
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virtual ~BTFILE(void);
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BT_KEYPACK *Find(const char *key);
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BT_KEYPACK *Next(void);
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void Make(BT_KEYPACK *keypack, uint16 count);
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2011-06-11 07:33:17 +00:00
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};
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} // End of namespace CGE
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#endif
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