com.att.nsa.util.base64.rrcBase64OutputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of saToolkit Show documentation

Library of code used in various service assurance systems

There is a newer version: 1.2.0-oss

/*******************************************************************************
 * Copyright (c) 2016 AT&T Intellectual Property. All rights reserved.
 *******************************************************************************/
/*
 *	This code was originally pulled from Apache licensed code from Rathravane LLC 
 */
package com.att.nsa.util.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;
}