1 files changed, 153 insertions, 0 deletions
diff --git a/jindroush/lib/cprefile.cpp b/jindroush/lib/cprefile.cpp
new file mode 100644
index 0000000..b96cdfe
--- /dev/null
+++ b/jindroush/lib/cprefile.cpp
@@ -0,0 +1,153 @@
+//    This program is free software; you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation; either version 2 of the License, or
+//    any later version.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with this program; if not, write to the Free Software
+//    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include "cprefile.h"
+
+CPreFile::CPreFile()
+{
+	m_lCacheStartOffset = -1;
+	m_lCacheEndOffset = -1;
+	m_bOpened = FALSE;
+	m_pbtCache = NULL;
+}
+
+CPreFile::~CPreFile()
+{
+	Close();
+}
+
+BOOL CPreFile::Open( CGenFile* pcf, int iCacheSizeKB )
+{
+	m_lCacheLen = 1024 * iCacheSizeKB;
+
+	if ( m_bOpened )
+		return FALSE;
+
+	m_pcf = pcf;
+
+	m_pcf->Seek( 0, SEEK_END );
+
+	m_lLength = m_pcf->Tell();
+
+	if ( m_lLength < m_lCacheLen )
+	{
+		m_lCacheLen = m_lLength;
+	}
+
+	if ( ! ( m_pbtCache = new BYTE [ m_lCacheLen ] ) )
+		return FALSE;
+
+	m_pcf->Seek( 0, SEEK_SET );
+
+	m_lCurrPtr = 0;
+
+	m_bOpened = TRUE;
+
+	PreRead();
+
+	return TRUE;
+
+}
+
+BOOL CPreFile::PreRead()
+{
+	m_pcf->Seek( m_lCurrPtr, SEEK_SET );
+	m_lCacheStartOffset = m_lCurrPtr;
+	m_lCacheEndOffset = m_lCacheStartOffset + m_lCacheLen - 1;
+
+	m_pcf->Read( m_pbtCache, m_lCacheLen );
+
+	return TRUE;
+}
+
+BOOL CPreFile::Read( void* pBuff, int iLen, int* piLen )
+{
+	if ( !m_bOpened )
+		return FALSE;
+
+	if ( m_lCurrPtr > m_lLength )
+		return FALSE;
+
+	if ( iLen >= m_lCacheLen )
+	{
+		m_pcf->Seek( m_lCurrPtr, SEEK_SET );
+		if ( !m_pcf->Read( pBuff, iLen, piLen ) )
+			return FALSE;
+
+		m_lCurrPtr = m_pcf->Tell();
+		m_lCacheEndOffset = -1;
+		return TRUE;
+	}
+	
+	if ( ( m_lCurrPtr < m_lCacheStartOffset ) || ( m_lCurrPtr > m_lCacheEndOffset ) )
+		PreRead();
+
+	long lReadEnd = m_lCurrPtr + iLen - 1;
+
+	if ( lReadEnd >= m_lCacheEndOffset )
+	{
+		m_pcf->Seek( m_lCurrPtr, SEEK_SET );
+		if ( !m_pcf->Read( pBuff, iLen, piLen ) )
+			return FALSE;
+
+		m_lCurrPtr = m_pcf->Tell();
+		m_lCacheEndOffset = -1;
+
+		return TRUE;
+	}
+
+	memcpy( pBuff, m_pbtCache + m_lCurrPtr - m_lCacheStartOffset, iLen );
+	m_lCurrPtr += iLen;
+
+	return TRUE;
+}
+
+BOOL CPreFile::Write( void* pBuff, int iLen, int* piLen )
+{
+	return FALSE;
+}
+
+BOOL CPreFile::Seek( long lPos, int iType )
+{
+
+	switch( iType )
+	{
+		case SEEK_SET:
+			m_lCurrPtr = lPos;
+			break;
+
+		case SEEK_CUR:
+			m_lCurrPtr += lPos;
+			break;
+
+		case SEEK_END:
+			m_lCurrPtr = m_lLength - lPos;
+			break;
+
+	}
+	return TRUE;
+}
+
+void CPreFile::Close()
+{
+	m_bOpened = FALSE;
+
+	if ( m_pbtCache )
+		delete [] m_pbtCache;
+
+	m_pbtCache = NULL;
+	m_lCurrPtr = 0;
+}
+