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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2011-07-02 06:23:32 +00:00
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#ifndef __CGE_BTFILE__
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#define __CGE_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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2011-07-19 06:24:06 +00:00
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#define BT_SIZE 1024
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2011-06-13 09:57:24 +00:00
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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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2011-06-30 06:30:23 +00:00
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struct BtKeypack {
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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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2011-06-30 06:30:23 +00:00
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struct Inner {
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uint8 _key[BT_KEYLEN];
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uint16 _down;
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};
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struct Hea {
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uint16 _count;
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uint16 _down;
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};
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2011-06-11 07:33:17 +00:00
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2011-06-30 06:30:23 +00:00
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struct BtPage {
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Hea _hea;
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2011-06-13 09:57:24 +00:00
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union {
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// dummy filler to make proper size of union
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2011-06-30 06:30:23 +00:00
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uint8 _data[BT_SIZE - sizeof(Hea)];
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2011-06-13 09:57:24 +00:00
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// inner version of data: key + word-sized page link
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2011-06-30 06:30:23 +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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2011-06-30 06:30:23 +00:00
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BtKeypack _lea[(BT_SIZE - sizeof(Hea)) / sizeof(BtKeypack)];
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2011-06-13 09:57:24 +00:00
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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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2011-06-30 06:30:23 +00:00
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class BtFile : public IoHand {
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2011-06-13 09:57:24 +00:00
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struct {
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2011-06-30 06:30:23 +00:00
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BtPage *_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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2011-07-01 06:37:40 +00:00
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void putPage(int lev, bool hard);
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2011-06-30 06:30:23 +00:00
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BtPage *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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2011-07-01 06:37:40 +00:00
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BtFile(const char *name, IOMODE mode, CRYPT *crpt);
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2011-06-30 06:30:23 +00:00
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virtual ~BtFile();
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BtKeypack *find(const char *key);
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BtKeypack *next();
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void make(BtKeypack *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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