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package com.xagasoft.gats;
import java.io.InputStream;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
public class GatsInputStream
{
private InputStream is;
private ByteArrayOutputStream baos = new ByteArrayOutputStream();
private int iVer = 0;
private int iSize;
public GatsInputStream( InputStream is )
{
this.is = is;
}
public GatsObject readObject() throws java.io.IOException
{
do
{
if( baos.size() < 5 )
{
byte aBuf[] = new byte[5-baos.size()];
int iRead = is.read( aBuf );
baos.write( aBuf, 0, iRead );
if( baos.size() < 5 )
return null;
}
} while( !skipReadNulls() );
if( iVer == 0 )
{
ByteArrayInputStream bais = new ByteArrayInputStream(
baos.toByteArray()
);
DataInputStream dis = new DataInputStream( bais );
iVer = dis.readUnsignedByte();
iSize = dis.readInt();
}
byte aBuf[] = new byte[1500];
while( baos.size() < iSize )
{
int iGoal = iSize-baos.size();
if( iGoal > 1500 )
iGoal = 1500;
int iRead = is.read( aBuf );
baos.write( aBuf, 0, iRead );
if( iRead < iGoal )
return null;
}
if( baos.size() < iSize )
return null;
ByteArrayInputStream bais = new ByteArrayInputStream(
baos.toByteArray()
);
bais.skip( 5 );
GatsObject goRet = GatsObject.read( bais );
iVer = 0;
return goRet;
}
private boolean skipReadNulls()
{
if( baos.size() == 0 )
return false;
byte aBuf[] = baos.toByteArray();
if( aBuf[0] != 0 )
return true;
for( int j = 1; j < aBuf.length; j++ )
{
if( aBuf[j] != 0 )
{
baos.reset();
baos.write( aBuf, j, aBuf.length-j );
return true;
}
}
baos.reset();
return true;
}
};
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