com.rathravane.till.data.base64.rrcBase64OutputStream Maven / Gradle / Ivy

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A small collection of classes used in various Rathravane systems.

There is a newer version: 2.1.1

package com.rathravane.till.data.base64;

import java.io.IOException;
import java.io.OutputStream;
import java.util.LinkedList;

public class rrcBase64OutputStream
	extends OutputStream
{
	public rrcBase64OutputStream ( OutputStream downstream )
	{
		fDownstream = downstream;
		fPendings = new LinkedList ();
		fWrittenToLine = 0;
	}

	@Override
	public void write ( int b )
		throws IOException
	{
		fPendings.add ( (byte) b );
		writePendings ( false );
	}

	@Override
	public void close () throws IOException
	{
		writePendings ( true );
		fDownstream.close ();
	}

	private int writeNow ()
	{
		int result = 0;
		int pending = fPendings.size ();
		if ( pending > kBufferSize )
		{
			result = kBufferSize;
		}
		return result;
	}
	
	private void writePendings ( boolean pad ) throws IOException
	{
		int thisWrite = fPendings.size ();
		if ( !pad )
		{
			thisWrite = writeNow ();
		}

		if ( thisWrite > 0 )
		{
			byte[] bb = new byte [ thisWrite ];
			for ( int i=0; i>> 2;
			int o1 = ( ( i0 & 3 ) << 4 ) | ( i1 >>> 4 );
			int o2 = ( ( i1 & 0xf ) << 2 ) | ( i2 >>> 6 );
			int o3 = i2 & 0x3F;
			out[op++] = rrcBase64Constants.nibblesToB64[o0];
			out[op++] = rrcBase64Constants.nibblesToB64[o1];
			out[op] = op < oDataLen ? rrcBase64Constants.nibblesToB64[o2] : '=';
			op++;
			out[op] = op < oDataLen ? rrcBase64Constants.nibblesToB64[o3] : '=';
			op++;
		}
		return out;
	}

	private static final int kMaxLine = 80;
	private static final int kBufferSize = 3*64;	// multiple of 3 for no padding
	
	private OutputStream fDownstream;
	private int fWrittenToLine;
	private final LinkedList fPendings;
}