Glenn Maynard
131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
#include "global.h"
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#include "SongCacheIndex.h"
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#include "RageLog.h"
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#include "RageUtil.h"
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#include "RageFileManager.h"
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#include "song.h"
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/*
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* A quick explanation of song cache hashes: Each song has two hashes; a hash of the
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* song path, and a hash of the song directory. The former is Song::GetCacheFilePath;
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* it stays the same if the contents of the directory change. The latter is
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* GetHashForDirectory(m_sSongDir), and changes on each modification.
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*
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* The file hash is used as the cache filename. We don't want to use the directory
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* hash: if we do that, then we'll write a new cache file every time the song changes,
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* and they'll accumulate or we'll have to be careful to delete them.
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*
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* The directory hash is stored in here, indexed by the song path, and used to determine
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* if a song has changed.
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*
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* Another advantage of this system is that we can load songs from cache given only their
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* path; we don't have to actually look in the directory (to find out the directory hash)
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* in order to find the cache file.
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*/
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#define CACHE_DIR "Cache/"
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#define CACHE_INDEX CACHE_DIR "index.cache"
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SongCacheIndex *SONGINDEX;
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CString SongCacheIndex::GetCacheFilePath( const CString &sGroup, const CString &sPath )
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{
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/* Use GetHashForString, not ForFile, since we don't want to spend time
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* checking the file size and date. */
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return ssprintf( "%s/%s/%u", CACHE_DIR, sGroup.c_str(), GetHashForString(sPath) );
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}
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SongCacheIndex::SongCacheIndex()
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{
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ReadCacheIndex();
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}
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SongCacheIndex::~SongCacheIndex()
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{
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}
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static void EmptyDir( CString dir )
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{
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ASSERT(dir[dir.size()-1] == '/');
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CStringArray asCacheFileNames;
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GetDirListing( dir, asCacheFileNames );
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for( unsigned i=0; i<asCacheFileNames.size(); i++ )
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{
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if( !IsADirectory(dir + asCacheFileNames[i]) )
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FILEMAN->Remove( dir + asCacheFileNames[i] );
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}
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}
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void SongCacheIndex::ReadCacheIndex()
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{
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CacheIndex.ReadFile( CACHE_INDEX ); // don't care if this fails
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int iCacheVersion = -1;
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CacheIndex.GetValue( "Cache", "CacheVersion", iCacheVersion );
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if( iCacheVersion == FILE_CACHE_VERSION )
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return; /* OK */
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LOG->Trace( "Cache format is out of date. Deleting all cache files." );
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EmptyDir( CACHE_DIR );
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EmptyDir( CACHE_DIR "Banners/" );
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EmptyDir( CACHE_DIR "Songs/" );
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EmptyDir( CACHE_DIR "Courses/" );
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CacheIndex.Clear();
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}
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void SongCacheIndex::AddCacheIndex(const CString &path, unsigned hash)
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{
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if( hash == 0 )
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++hash; /* no 0 hash values */
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CacheIndex.SetValue( "Cache", "CacheVersion", FILE_CACHE_VERSION );
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CacheIndex.SetValue( "Cache", MangleName(path), hash );
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CacheIndex.WriteFile( CACHE_INDEX );
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}
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unsigned SongCacheIndex::GetCacheHash( const CString &path ) const
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{
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unsigned iDirHash;
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if( !CacheIndex.GetValue( "Cache", MangleName(path), iDirHash ) )
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return 0;
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if( iDirHash == 0 )
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++iDirHash; /* no 0 hash values */
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return iDirHash;
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}
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CString SongCacheIndex::MangleName( const CString &Name )
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{
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/* We store paths in an INI. We can't store '='. */
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CString ret = Name;
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ret.Replace( "=", "");
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return ret;
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}
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/*
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* (c) 2002-2003 Glenn Maynard
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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