mirror of
https://github.com/libretro/scummvm.git
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156 lines
3.3 KiB
C++
156 lines
3.3 KiB
C++
/* 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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#ifndef CGE_FILEIO_H
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#define CGE_FILEIO_H
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#include "cge/general.h"
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#include "common/stream.h"
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namespace CGE {
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#define kBtSize 1024
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#define kBtKeySize 13
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#define kBtLevel 2
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#define kBtInnerCount ((kBtSize - 4 /*sizeof(Hea) */) / (kBtKeySize + 2 /*sizeof(Inner) */))
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#define kBtLeafCount ((kBtSize - 4 /*sizeof(Hea) */) / (kBtKeySize + 4 + 2 /*sizeof(BtKeypack) */))
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#define kBtValNone 0xFFFF
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#define kBtValRoot 0
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#define kLineMaxSize 512
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#define kBufferSize 2048
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#define kCatName "VOL.CAT"
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#define kDatName "VOL.DAT"
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struct BtKeypack {
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char _key[kBtKeySize];
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uint32 _mark;
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uint16 _size;
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};
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struct Inner {
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uint8 _key[kBtKeySize];
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uint16 _down;
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};
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struct Header {
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uint16 _count;
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uint16 _down;
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};
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class IoHand {
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protected:
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uint16 _seed;
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Crypt *_crypt;
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public:
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Common::File *_file;
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uint16 _error;
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IoHand(const char *name, Crypt crypt);
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IoHand(Crypt *crypt);
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virtual ~IoHand();
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uint16 read(void *buf, uint16 len);
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long mark();
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long size();
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long seek(long pos);
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};
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class IoBuf : public IoHand {
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protected:
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uint8 *_buff;
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uint16 _ptr;
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uint16 _lim;
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long _bufMark;
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virtual void readBuf();
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public:
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IoBuf(Crypt *crpt);
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IoBuf(const char *name, Crypt *crpt);
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virtual ~IoBuf();
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uint16 read(void *buf, uint16 len);
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uint16 read(uint8 *buf);
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int read();
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};
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class CFile : public IoBuf {
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public:
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CFile(const char *name, Crypt *crpt);
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virtual ~CFile();
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long mark();
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long seek(long pos);
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};
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struct BtPage {
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Header _header;
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union {
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// dummy filler to make proper size of union
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uint8 _data[kBtSize - 4]; /* 4 is the size of struct Header */
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// inner version of data: key + word-sized page link
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Inner _inner[kBtInnerCount];
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// leaf version of data: key + all user data
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BtKeypack _leaf[kBtLeafCount];
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};
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void read(Common::ReadStream &s);
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};
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class BtFile : public IoHand {
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struct {
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BtPage *_page;
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uint16 _pgNo;
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int _indx;
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} _buff[kBtLevel];
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BtPage *getPage(int lev, uint16 pgn);
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public:
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BtFile(const char *name, Crypt *crpt);
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virtual ~BtFile();
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BtKeypack *find(const char *key);
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bool exist(const char *name);
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};
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class VFile : public IoBuf {
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private:
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long _begMark;
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long _endMark;
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void readBuf();
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public:
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VFile(const char *name);
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~VFile();
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long mark();
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long size();
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long seek(long pos);
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};
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extern CFile *_dat;
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extern BtFile *_cat;
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} // End of namespace CGE
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#endif
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