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package com.sun.enterprise.web.connector.grizzly.ssl;

import com.sun.enterprise.web.connector.grizzly.ByteBufferInputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Stream wrapper around a <code>ByteBuffer</code>. Under the hood, Selector
 * are used to read bytes from the underlying socketChannel. 
 *
 * @author Jean-Francois Arcand
 */
public class SSLByteBufferInputStream extends ByteBufferInputStream {

    /**
     * Read and decrypt bytes from the underlying SSL connections. All
     * the SSLEngine operations are delegated to class <code>SSLUtils</code>.
     */
    protected int doRead(){   
        final SSLWorkerThread workerThread = 
                (SSLWorkerThread)Thread.currentThread();

        byteBuffer.compact();
        
        int initialPosition = byteBuffer.position();
        int byteRead = 0;
        
        // We need to make sure the unwrap worked properly and we have all
        // the packets properly read. If the SSLEngine fail to unwrap all the 
        // bytes, the byteBuffer will be empty event if some encrypted bytes
        // are available. 
        while (byteBuffer.position() == initialPosition){
            int currentRead = SSLUtils.doHandshakeRead(key,workerThread.getInputBB(),
                    workerThread.getSSLEngine(),readTimeout);
            
            if (currentRead > 0) {
                byteRead += currentRead;
            }
            
            if (currentRead > 0 || workerThread.getInputBB().position() > 0) {
                try{
                    byteBuffer = SSLUtils.unwrapAll(byteBuffer,
                            workerThread.getInputBB(),workerThread.getSSLEngine());
                    workerThread.setByteBuffer(byteBuffer);
                } catch (IOException ex){
                    Logger logger = SSLSelectorThread.logger();
                    if ( logger.isLoggable(Level.FINE) )
                        logger.log(Level.FINE,"SSLUtils.unwrapAll",ex);
                    return -1;
                }
            }  else {
                break;
            }   
        }

        byteBuffer.flip();
        return byteRead;
    } 
}