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package org.eclipse.jetty.websocket;
import java.io.IOException;
import java.util.Map;
public class FragmentExtension extends AbstractExtension
{
private int _maxLength=-1;
private int _minFragments=1;
public FragmentExtension()
{
super("fragment");
}
@Override
public boolean init(Map<String, String> parameters)
{
if(super.init(parameters))
{
_maxLength=getInitParameter("maxLength",_maxLength);
_minFragments=getInitParameter("minFragments",_minFragments);
return true;
}
return false;
}
@Override
public void addFrame(byte flags, byte opcode, byte[] content, int offset, int length) throws IOException
{
if (getConnection().isControl(opcode))
{
super.addFrame(flags,opcode,content,offset,length);
return;
}
int fragments=1;
while (_maxLength>0 && length>_maxLength)
{
fragments++;
super.addFrame((byte)(flags&~getConnection().finMask()),opcode,content,offset,_maxLength);
length-=_maxLength;
offset+=_maxLength;
opcode=getConnection().continuationOpcode();
}
while (fragments<_minFragments)
{
int frag=length/2;
fragments++;
super.addFrame((byte)(flags&0x7),opcode,content,offset,frag);
length-=frag;
offset+=frag;
opcode=getConnection().continuationOpcode();
}
super.addFrame((byte)(flags|getConnection().finMask()),opcode,content,offset,length);
}
}
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