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https://github.com/libretro/scummvm.git
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121 lines
2.9 KiB
C++
121 lines
2.9 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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*
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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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*
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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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class CGEEngine;
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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 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 _pos;
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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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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 readBTree(Common::ReadStream &s);
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};
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class ResourceManager {
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struct {
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BtPage *_page;
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uint16 _pageNo;
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int _index;
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} _buff[kBtLevel];
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BtPage *getPage(int level, uint16 pageId);
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uint16 catRead(byte *buf, uint16 length);
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Common::File *_catFile;
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Common::File *_datFile;
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void XCrypt(byte *buf, uint16 length);
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public:
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ResourceManager();
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~ResourceManager();
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uint16 read(byte *buf, uint16 length);
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bool seek(int32 offs, int whence = SEEK_SET);
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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 EncryptedStream {
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private:
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CGEEngine *_vm;
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Common::SeekableReadStream *_readStream;
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bool _error;
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public:
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EncryptedStream(CGEEngine *vm, const char *name);
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~EncryptedStream();
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bool err();
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bool eos();
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bool seek(int32 offset);
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int32 pos();
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int32 size();
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uint32 read(byte *dataPtr, uint32 dataSize);
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Common::String readLine();
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};
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} // End of namespace CGE
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#endif
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