00001 /* +---------------------------------------------------------------------------+ 00002 | The Mobile Robot Programming Toolkit (MRPT) C++ library | 00003 | | 00004 | http://www.mrpt.org/ | 00005 | | 00006 | Copyright (C) 2005-2011 University of Malaga | 00007 | | 00008 | This software was written by the Machine Perception and Intelligent | 00009 | Robotics Lab, University of Malaga (Spain). | 00010 | Contact: Jose-Luis Blanco <jlblanco@ctima.uma.es> | 00011 | | 00012 | This file is part of the MRPT project. | 00013 | | 00014 | MRPT is free software: you can redistribute it and/or modify | 00015 | it under the terms of the GNU General Public License as published by | 00016 | the Free Software Foundation, either version 3 of the License, or | 00017 | (at your option) any later version. | 00018 | | 00019 | MRPT is distributed in the hope that it will be useful, | 00020 | but WITHOUT ANY WARRANTY; without even the implied warranty of | 00021 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 00022 | GNU General Public License for more details. | 00023 | | 00024 | You should have received a copy of the GNU General Public License | 00025 | along with MRPT. If not, see <http://www.gnu.org/licenses/>. | 00026 | | 00027 +---------------------------------------------------------------------------+ */ 00028 #ifndef CFileGZInputStream_H 00029 #define CFileGZInputStream_H 00030 00031 #include <mrpt/utils/CStream.h> 00032 00033 #include <iostream> 00034 00035 00036 /*--------------------------------------------------------------- 00037 Class 00038 ---------------------------------------------------------------*/ 00039 namespace mrpt 00040 { 00041 namespace utils 00042 { 00043 /** Transparently opens a compressed "gz" file and reads uncompressed data from it. 00044 * If the file is not a .gz file, it silently reads data from the file. 00045 * This class requires compiling MRPT with wxWidgets. If wxWidgets is not available then the class is actually mapped to the standard CFileInputStream 00046 * 00047 * \sa CFileInputStream 00048 * \ingroup mrpt_base_grp 00049 */ 00050 class BASE_IMPEXP CFileGZInputStream : public CStream, public CUncopiable 00051 { 00052 protected: 00053 /** Method responsible for reading from the stream. 00054 */ 00055 size_t Read(void *Buffer, size_t Count); 00056 00057 /** Method responsible for writing to the stream. 00058 * Write attempts to write up to Count bytes to Buffer, and returns the number of bytes actually written. 00059 */ 00060 size_t Write(const void *Buffer, size_t Count); 00061 00062 // DECLARE_UNCOPIABLE( CFileGZInputStream ) 00063 00064 private: 00065 void *m_f; 00066 uint64_t m_file_size; //!< Compressed file size 00067 00068 public: 00069 /** Constructor without open 00070 */ 00071 CFileGZInputStream(); 00072 00073 /** Constructor and open 00074 * \param fileName The file to be open in this stream 00075 * \exception std::exception If there's an error opening the file. 00076 */ 00077 CFileGZInputStream(const std::string &fileName ); 00078 00079 /** Destructor 00080 */ 00081 virtual ~CFileGZInputStream(); 00082 00083 /** Opens the file for read. 00084 * \param fileName The file to be open in this stream 00085 * \return false if there's an error opening the file, true otherwise 00086 */ 00087 bool open(const std::string &fileName ); 00088 00089 /** Closes the file */ 00090 void close(); 00091 00092 /** Says if file was open successfully or not. 00093 */ 00094 bool fileOpenCorrectly(); 00095 00096 /** Will be true if EOF has been already reached. 00097 */ 00098 bool checkEOF(); 00099 00100 /** Method for getting the total number of <b>compressed</b> bytes of in the file (the physical size of the compressed file). 00101 */ 00102 uint64_t getTotalBytesCount(); 00103 00104 /** Method for getting the current cursor position in the <b>compressed</b>, where 0 is the first byte and TotalBytesCount-1 the last one. 00105 */ 00106 uint64_t getPosition(); 00107 00108 /** This method is not implemented in this class */ 00109 uint64_t Seek(long Offset, CStream::TSeekOrigin Origin = sFromBeginning) 00110 { 00111 THROW_EXCEPTION("Seek is not implemented in this class"); 00112 } 00113 00114 }; // End of class def. 00115 00116 } // End of namespace 00117 } // end of namespace 00118 #endif
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