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# cpl_vsi_virtual.h

    00001 /******************************************************************************
    00002  * $Id: cpl_vsi_virtual.h 23467 2011-12-04 22:56:00Z rouault $
    00003  *
    00004  * Project:  VSI Virtual File System
    00005  * Purpose:  Declarations for classes related to the virtual filesystem.
    00006  *           These would only be normally required by applications implmenting
    00007  *           their own virtual file system classes which should be rare.
    00008  *           The class interface may be fragile through versions.
    00009  * Author:   Frank Warmerdam, warmerdam@pobox.com
    00010  *
    00011  ******************************************************************************
    00012  * Copyright (c) 2005, Frank Warmerdam <warmerdam@pobox.com>
    00013  *
    00014  * Permission is hereby granted, free of charge, to any person obtaining a
    00015  * copy of this software and associated documentation files (the "Software"),
    00016  * to deal in the Software without restriction, including without limitation
    00017  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    00018  * and/or sell copies of the Software, and to permit persons to whom the
    00019  * Software is furnished to do so, subject to the following conditions:
    00020  *
    00021  * The above copyright notice and this permission notice shall be included
    00022  * in all copies or substantial portions of the Software.
    00023  *
    00024  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00025  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00026  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00027  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00028  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00029  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00030  * DEALINGS IN THE SOFTWARE.
    00031  ****************************************************************************/
    00032
    00033 #ifndef CPL_VSI_VIRTUAL_H_INCLUDED
    00034 #define CPL_VSI_VIRTUAL_H_INCLUDED
    00035
    00036 #include "cpl_vsi.h"
    00037 #include "cpl_string.h"
    00038
    00039 #if defined(WIN32CE)
    00040 #  include "cpl_wince.h"
    00041 #  include <wce_errno.h>
    00042 #  pragma warning(disable:4786) /* Remove annoying warnings in eVC++ and VC++ 6.0 */
    00043 #endif
    00044
    00045 #include <map>
    00046 #include <vector>
    00047 #include <string>
    00048
    00049 /************************************************************************/
    00050 /*                           VSIVirtualHandle                           */
    00051 /************************************************************************/
    00052
    00053 class CPL_DLL VSIVirtualHandle {
    00054   public:
    00055     virtual int       Seek( vsi_l_offset nOffset, int nWhence ) = 0;
    00056     virtual vsi_l_offset Tell() = 0;
    00057     virtual size_t    Read( void *pBuffer, size_t nSize, size_t nMemb ) = 0;
    00058     virtual int       ReadMultiRange( int nRanges, void ** ppData, const vsi_l_offset* panOffsets, const size_t* panSizes );
    00059     virtual size_t    Write( const void *pBuffer, size_t nSize,size_t nMemb)=0;
    00060     virtual int       Eof() = 0;
    00061     virtual int       Flush() {return 0;}
    00062     virtual int       Close() = 0;
    00063     virtual int       Truncate( vsi_l_offset nNewSize ) { return -1; }
    00064     virtual           ~VSIVirtualHandle() { }
    00065 };
    00066
    00067 /************************************************************************/
    00068 /*                         VSIFilesystemHandler                         */
    00069 /************************************************************************/
    00070
    00071 class CPL_DLL VSIFilesystemHandler {
    00072
    00073 public:
    00074
    00075     virtual ~VSIFilesystemHandler() {}
    00076
    00077     virtual VSIVirtualHandle *Open( const char *pszFilename,
    00078                                     const char *pszAccess) = 0;
    00079     virtual int Stat( const char *pszFilename, VSIStatBufL *pStatBuf, int nFlags) = 0;
    00080     virtual int Unlink( const char *pszFilename )
    00081                       { (void) pszFilename; errno=ENOENT; return -1; }
    00082     virtual int Mkdir( const char *pszDirname, long nMode )
    00083                       {(void)pszDirname; (void)nMode; errno=ENOENT; return -1;}
    00084     virtual int Rmdir( const char *pszDirname )
    00085                       { (void) pszDirname; errno=ENOENT; return -1; }
    00086     virtual char **ReadDir( const char *pszDirname )
    00087                       { (void) pszDirname; return NULL; }
    00088     virtual int Rename( const char *oldpath, const char *newpath )
    00089                       { (void) oldpath; (void)newpath; errno=ENOENT; return -1; }
    00090     virtual int IsCaseSensitive( const char* pszFilename )
    00091                       { (void) pszFilename; return TRUE; }
    00092 };
    00093
    00094 /************************************************************************/
    00095 /*                            VSIFileManager                            */
    00096 /************************************************************************/
    00097
    00098 class CPL_DLL VSIFileManager
    00099 {
    00100 private:
    00101     VSIFilesystemHandler *poDefaultHandler;
    00102     std::map<std::string, VSIFilesystemHandler *> oHandlers;
    00103
    00104     VSIFileManager();
    00105
    00106     static VSIFileManager *Get();
    00107
    00108 public:
    00109     ~VSIFileManager();
    00110
    00111     static VSIFilesystemHandler *GetHandler( const char * );
    00112     static void InstallHandler( const std::string& osPrefix,
    00113                                 VSIFilesystemHandler * );
    00114     static void RemoveHandler( const std::string& osPrefix );
    00115 };
    00116
    00117
    00118 /************************************************************************/
    00119 /* ==================================================================== */
    00120 /*                       VSIArchiveFilesystemHandler                   */
    00121 /* ==================================================================== */
    00122 /************************************************************************/
    00123
    00124 class VSIArchiveEntryFileOffset
    00125 {
    00126     public:
    00127         virtual ~VSIArchiveEntryFileOffset();
    00128 };
    00129
    00130 typedef struct
    00131 {
    00132     char         *fileName;
    00133     vsi_l_offset  uncompressed_size;
    00134     VSIArchiveEntryFileOffset*      file_pos;
    00135     int           bIsDir;
    00136     GIntBig       nModifiedTime;
    00137 } VSIArchiveEntry;
    00138
    00139 typedef struct
    00140 {
    00141     int nEntries;
    00142     VSIArchiveEntry* entries;
    00143 } VSIArchiveContent;
    00144
    00145 class VSIArchiveReader
    00146 {
    00147     public:
    00148         virtual ~VSIArchiveReader();
    00149
    00150         virtual int GotoFirstFile() = 0;
    00151         virtual int GotoNextFile() = 0;
    00152         virtual VSIArchiveEntryFileOffset* GetFileOffset() = 0;
    00153         virtual GUIntBig GetFileSize() = 0;
    00154         virtual CPLString GetFileName() = 0;
    00155         virtual GIntBig GetModifiedTime() = 0;
    00156         virtual int GotoFileOffset(VSIArchiveEntryFileOffset* pOffset) = 0;
    00157 };
    00158
    00159 class VSIArchiveFilesystemHandler : public VSIFilesystemHandler
    00160 {
    00161 protected:
    00162     void* hMutex;
    00163     /* We use a cache that contains the list of files containes in a VSIArchive file as */
    00164     /* unarchive.c is quite inefficient in listing them. This speeds up access to VSIArchive files */
    00165     /* containing ~1000 files like a CADRG product */
    00166     std::map<CPLString,VSIArchiveContent*>   oFileList;
    00167
    00168     virtual const char* GetPrefix() = 0;
    00169     virtual std::vector<CPLString> GetExtensions() = 0;
    00170     virtual VSIArchiveReader* CreateReader(const char* pszArchiveFileName) = 0;
    00171
    00172 public:
    00173     VSIArchiveFilesystemHandler();
    00174     virtual ~VSIArchiveFilesystemHandler();
    00175
    00176     virtual int      Stat( const char *pszFilename, VSIStatBufL *pStatBuf, int nFlags );
    00177     virtual int      Unlink( const char *pszFilename );
    00178     virtual int      Rename( const char *oldpath, const char *newpath );
    00179     virtual int      Mkdir( const char *pszDirname, long nMode );
    00180     virtual int      Rmdir( const char *pszDirname );
    00181     virtual char   **ReadDir( const char *pszDirname );
    00182
    00183     virtual const VSIArchiveContent* GetContentOfArchive(const char* archiveFilename, VSIArchiveReader* poReader = NULL);
    00184     virtual char* SplitFilename(const char *pszFilename, CPLString &osFileInArchive, int bCheckMainFileExists);
    00185     virtual VSIArchiveReader* OpenArchiveFile(const char* archiveFilename, const char* fileInArchiveName);
    00186     virtual int FindFileInArchive(const char* archiveFilename, const char* fileInArchiveName, const VSIArchiveEntry** archiveEntry);
    00187 };
    00188
    00189 VSIVirtualHandle* VSICreateBufferedReaderHandle(VSIVirtualHandle* poBaseHandle);
    00190 VSIVirtualHandle* VSICreateCachedFile( VSIVirtualHandle* poBaseHandle );
    00191
    00192 #endif /* ndef CPL_VSI_VIRTUAL_H_INCLUDED */

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