Visualization Library v1.0.3A lightweight C++ OpenGL middleware for 2D/3D graphics |
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00001 /**************************************************************************************/ 00002 /* */ 00003 /* Visualization Library */ 00004 /* http://visualizationlibrary.org */ 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 VL_INSTRUMENT_CLASS(vl::GZipCodec, VirtualFile) 00046 00047 // Lower this if you need to limit the amount of data allocated to the stack, for example to 16K. 00048 static const int CHUNK_SIZE = 128*1024; 00049 00050 public: 00052 GZipCodec(VirtualFile* stream=NULL); 00053 00055 GZipCodec(const String& gz_path); 00056 00058 ~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