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103 lines
3.1 KiB
C++
103 lines
3.1 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef MSCAB_H
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#define MSCAB_H
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#include "common/hashmap.h"
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#include "common/hash-str.h"
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#include "common/stream.h"
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#include "common/archive.h"
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#include "common/str.h"
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#include "common/util.h"
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namespace Grim {
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class MsCabinet : public Common::Archive {
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public:
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MsCabinet(Common::SeekableReadStream *data);
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~MsCabinet();
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// Common::Archive API implementation
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bool hasFile(const Common::Path &path) const override;
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int listMembers(Common::ArchiveMemberList &list) const override;
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const Common::ArchiveMemberPtr getMember(const Common::Path &path) const override;
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Common::SeekableReadStream *createReadStreamForMember(const Common::Path &path) const override;
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private:
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Common::SeekableReadStream *_data;
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struct FolderEntry {
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uint16 comp_type; // The compression type
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uint16 num_blocks; // The total number of data blocks used by this folder
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uint32 offset; // The cabinet offset of first datablock
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};
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struct FileEntry {
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uint32 length; // Uncompressed size of the file in bytes
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FolderEntry *folder; // Folder holding this file
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uint32 folderOffset; // Uncompressed offset in the folder
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};
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typedef Common::HashMap<Common::Path, FileEntry, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> FileMap;
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FileMap _fileMap;
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typedef Common::HashMap<uint16, FolderEntry> FolderMap;
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FolderMap _folderMap;
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Common::String readString(Common::ReadStream *stream);
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// Decompressor
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class Decompressor {
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public:
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Decompressor(const FolderEntry *folder, Common::SeekableReadStream *_data);
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~Decompressor();
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bool decompressFile(byte *&fileBuf, const FileEntry &entry);
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const FolderEntry *getFolder() const {
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return _curFolder;
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}
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private:
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Common::SeekableReadStream *_data;
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const FolderEntry *_curFolder;
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int16 _curBlock;
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byte *_compressedBlock, *_decompressedBlock;
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byte *_fileBuf;
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uint16 _startBlock, _inBlockStart, _endBlock, _inBlockEnd;
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void copyBlock(byte *&data_ptr) const;
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enum {
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kMszipCompression = 1,
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kCabBlockSize = 0x8000,
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kCabInputmax = kCabBlockSize + 12
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};
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};
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mutable Decompressor *_decompressor;
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// Cache
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typedef Common::HashMap<Common::Path, byte *, Common::Path::IgnoreCase_Hash, Common::Path::IgnoreCase_EqualTo> CacheMap;
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mutable CacheMap _cache;
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};
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} // End of namespace Grim
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#endif
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