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118 lines
2.2 KiB
118 lines
2.2 KiB
5 years ago
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#include "filememcache.h"
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namespace {
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unsigned long s_ulCachedFileSignature = 0xCACEF11E;
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};
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//
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// Cached file data implementation
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//
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CachedFileData * CachedFileData::Create( char const *szFilename )
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{
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FILE *f = fopen( szFilename, "rb" );
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int nSize = -1;
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if ( f )
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{
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fseek( f, 0, SEEK_END );
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nSize = ftell( f );
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fseek( f, 0, SEEK_SET );
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}
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CachedFileData *pData = ( CachedFileData * ) malloc( eHeaderSize + max( nSize, 0 ) );
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strcpy( pData->m_chFilename, szFilename );
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pData->m_numRefs = 0;
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pData->m_numDataBytes = nSize;
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pData->m_signature = s_ulCachedFileSignature;
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if ( f )
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{
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fread( pData->m_data, 1, nSize, f );
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fclose( f );
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}
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return pData;
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}
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void CachedFileData::Free( void )
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{
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free( this );
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}
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CachedFileData *CachedFileData::GetByDataPtr( void const *pvDataPtr )
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{
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unsigned char const *pbBuffer = reinterpret_cast< unsigned char const * >( pvDataPtr );
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// Assert( pbBuffer );
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CachedFileData const *pData = reinterpret_cast< CachedFileData const * >( pbBuffer - eHeaderSize );
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// Assert( pData->m_signature == s_ulCachedFileSignature );
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return const_cast< CachedFileData * >( pData );
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}
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char const * CachedFileData::GetFileName() const
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{
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return m_chFilename;
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}
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void const * CachedFileData::GetDataPtr() const
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{
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return m_data;
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}
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int CachedFileData::GetDataLen() const
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{
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return max( m_numDataBytes, 0 );
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}
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bool CachedFileData::IsValid() const
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{
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return ( m_numDataBytes >= 0 );
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}
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//
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// File cache implementation
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//
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FileCache::FileCache()
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{
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NULL;
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}
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CachedFileData * FileCache::Get( char const *szFilename )
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{
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// Search the cache first
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Mapping::iterator it = m_map.find( szFilename );
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if ( it != m_map.end() )
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return it->second;
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// Create the cached file data
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CachedFileData *pData = CachedFileData::Create( szFilename );
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if ( pData )
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m_map.insert( Mapping::value_type( pData->GetFileName(), pData ) );
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return pData;
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}
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void FileCache::Clear()
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{
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for ( Mapping::iterator it = m_map.begin(), itEnd = m_map.end(); it != itEnd; ++ it )
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{
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it->second->Free();
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}
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m_map.clear();
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}
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