85 lines
3.4 KiB
Objective-C
85 lines
3.4 KiB
Objective-C
/****************************************************************************
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Copyright (c) 2006, Radon Labs GmbH
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#pragma once
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//------------------------------------------------------------------------------
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/**
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@class IO::ZipFileSystem
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An archive filesystem wrapper for ZIP files.
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Uses the zlib and the minizip package under the hood.
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Limitations:
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* No write access.
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* No seek on compressed data, the ZipFileSystem will generally decompress
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an entire file into memory at once, so that the ZipStreamClass can
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provide random access on the decompressed data. Thus the typical
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"audio streaming scenario" is not possible from zip files (that's
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what XACT's sound banks is there for anyway ;)
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How to fix the no-seek problem:
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* zlib processes datas in chunks, and cannot seek randomly within
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a chunk, and the chunk size is dependent on the compress application
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being used to create the zip file(?), if those internals are known,
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it would be possible to write a chunked filesystem which keeps
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buffered chunks around for each client, probably not worth the effort.
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* Another appoach would be to split stream-files into "chunk-files"
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before compressing, and to read the next complete chunk files
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when new data is needed. This approach doesn't require changes to
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the strip filesystem.
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*/
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#include "io/archfs/archivefilesystembase.h"
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//------------------------------------------------------------------------------
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namespace IO
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{
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class ZipArchive;
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class ZipFileSystem : public ArchiveFileSystemBase
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{
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__DeclareClass(ZipFileSystem);
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__DeclareImageSingleton(ZipFileSystem);
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public:
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/// constructor
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ZipFileSystem();
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/// destructor
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virtual ~ZipFileSystem();
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/// setup the archive file system
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void Setup();
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/// discard the archive file system
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void Discard();
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/// find first archive which contains the file path
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GPtr<Archive> FindArchiveWithFile(const URI& fileUri) const;
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/// find first archive which contains the directory path
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GPtr<Archive> FindArchiveWithDir(const URI& dirUri) const;
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};
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} // namespace IO
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//------------------------------------------------------------------------------
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