# Visualization Library

A lightweight C++ OpenGL middleware for 2D/3D graphics

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# D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlCore/GZipCodec.hpp

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    00001 /**************************************************************************************/
    00002 /*                                                                                    */
    00003 /*  Visualization Library                                                             */
    00004 /*  http://www.visualizationlibrary.com                                               */
    00005 /*                                                                                    */
    00006 /*  Copyright (c) 2005-2010, Michele Bosi                                             */
    00007 /*  All rights reserved.                                                              */
    00008 /*                                                                                    */
    00009 /*  Redistribution and use in source and binary forms, with or without modification,  */
    00010 /*  are permitted provided that the following conditions are met:                     */
    00011 /*                                                                                    */
    00012 /*  - Redistributions of source code must retain the above copyright notice, this     */
    00013 /*  list of conditions and the following disclaimer.                                  */
    00014 /*                                                                                    */
    00015 /*  - Redistributions in binary form must reproduce the above copyright notice, this  */
    00016 /*  list of conditions and the following disclaimer in the documentation and/or       */
    00017 /*  other materials provided with the distribution.                                   */
    00018 /*                                                                                    */
    00019 /*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND   */
    00020 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED     */
    00021 /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE            */
    00022 /*  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR  */
    00023 /*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    */
    00024 /*  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;      */
    00025 /*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON    */
    00026 /*  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT           */
    00027 /*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS     */
    00028 /*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                      */
    00029 /*                                                                                    */
    00030 /**************************************************************************************/
    00031
    00032 #ifndef GZipCodec_INCLUDE_ONCE
    00033 #define GZipCodec_INCLUDE_ONCE
    00034
    00035 #include <vlCore/VirtualFile.hpp>
    00036 struct z_stream_s;
    00037
    00038 namespace vl
    00039 {
    00043   class VLCORE_EXPORT GZipCodec: public VirtualFile
    00044   {
    00045     // Lower this if you need to limit the amount of data allocated to the stack, for example to 16K.
    00046     static const int CHUNK_SIZE = 128*1024;
    00047
    00048   public:
    00050     GZipCodec(VirtualFile* stream=NULL);
    00051
    00053     GZipCodec(const String& gz_path);
    00054
    00056     ~GZipCodec();
    00057
    00058     virtual const char* className() { return "vl::GZipCodec"; }
    00059
    00063     virtual bool open(EOpenMode mode);
    00064
    00066     virtual bool isOpen() const { return mReadBytes != -1; }
    00067
    00069     virtual bool exists() const { return mStream ? mStream->exists() : false; }
    00070
    00072     virtual void close();
    00073
    00075     virtual long long size() const;
    00076
    00078     virtual ref<VirtualFile> clone() const;
    00079
    00080     GZipCodec& operator=(const GZipCodec& other);
    00081
    00084     void setCompressionLevel(int level) { mCompressionLevel = level; }
    00085
    00086     int compressionLevel() const { return mCompressionLevel; }
    00087
    00089     void setStream(VirtualFile* stream);
    00090
    00092     const VirtualFile* stream() const { return mStream.get(); }
    00093
    00095     VirtualFile* stream() { return mStream.get(); }
    00096
    00101     long long uncompressedSize();
    00102
    00104     long long compressedSize() const { return stream() ? stream()->size() : -1; }
    00105
    00107     float compressionRatio() const;
    00108
    00109     bool warnOnSeek() const { return mWarnOnSeek; }
    00110
    00111     void setWarnOnSeek(bool warn_on) { mWarnOnSeek = warn_on; }
    00112
    00113   protected:
    00114     virtual long long read_Implementation(void* buffer, long long bytes_to_read);
    00115     virtual long long write_Implementation(const void* buffer, long long byte_count);
    00116     virtual long long position_Implementation() const;
    00117     void resetStream();
    00118     bool seekSet_Implementation(long long pos);
    00119     bool fillUncompressedBuffer();
    00120
    00121   protected:
    00122     int mCompressionLevel;
    00123     ref<VirtualFile> mStream;
    00124     long long mReadBytes;
    00125     long long mWrittenBytes;
    00126     bool mWarnOnSeek;
    00127
    00128     z_stream_s* mZStream;
    00129     unsigned char mZipBufferIn[CHUNK_SIZE];
    00130     unsigned char mZipBufferOut[CHUNK_SIZE];
    00131     std::vector<char> mUncompressedBuffer;
    00132     int mUncompressedBufferPtr;
    00133     long long mStreamSize;
    00134     long long mUncompressedSize;
    00135     enum { ZNone, ZCompress, ZDecompress } mMode;
    00136   };
    00137 }
    00138
    00139 #endif

Visualization Library v2011.05.1142 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu May 26 2011 22:51:20.
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