BufferUtils.java

/*
*******************************************************************************    
*   BTChip Bitcoin Hardware Wallet Java API
*   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
*   
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*   limitations under the License.
********************************************************************************
*/

package com.btchip.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import com.btchip.BTChipException;

public class BufferUtils {
	
	public static void writeUint32BE(ByteArrayOutputStream buffer, long value) {
		buffer.write((byte)((value >> 24) & 0xff));
		buffer.write((byte)((value >> 16) & 0xff));
		buffer.write((byte)((value >> 8) & 0xff));
		buffer.write((byte)(value & 0xff));		
	}

	public static void writeUint32LE(ByteArrayOutputStream buffer, long value) {
		buffer.write((byte)(value & 0xff));		
		buffer.write((byte)((value >> 8) & 0xff));
		buffer.write((byte)((value >> 16) & 0xff));
		buffer.write((byte)((value >> 24) & 0xff));				
	}
	
	public static void writeUint64LE(ByteArrayOutputStream buffer, long value) {
		buffer.write((byte)(value & 0xff));		
		buffer.write((byte)((value >> 8) & 0xff));
		buffer.write((byte)((value >> 16) & 0xff));
		buffer.write((byte)((value >> 24) & 0xff));				
		buffer.write((byte)((value >> 32) & 0xff));
		buffer.write((byte)((value >> 40) & 0xff));
		buffer.write((byte)((value >> 48) & 0xff));
		buffer.write((byte)((value >> 56) & 0xff));		
	}
		
	public static void writeUint64BE(ByteArrayOutputStream buffer, long value) {
		buffer.write((byte)((value >> 56) & 0xff));
		buffer.write((byte)((value >> 48) & 0xff));
		buffer.write((byte)((value >> 40) & 0xff));
		buffer.write((byte)((value >> 32) & 0xff));
		buffer.write((byte)((value >> 24) & 0xff));
		buffer.write((byte)((value >> 16) & 0xff));
		buffer.write((byte)((value >> 8) & 0xff));
		buffer.write((byte)(value & 0xff));						
	}
	
	public static void writeBuffer(ByteArrayOutputStream buffer, byte[] data) throws BTChipException {
		try {
			buffer.write(data);
		}
		catch(IOException e) {
			throw new BTChipException("Internal error", e);
		}
	}
	
}