cm/src/main/java/org/bdware/sc/units/ByteUtil.java

package org.bdware.sc.units;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

public class ByteUtil {
//	public static byte[] readRest(ByteArrayInputStream bi) {
//		byte[] ret = new byte[bi.available()];
//		bi.read(ret, 0, ret.length);
//		return ret;
//	}

	public static int readInt(ByteArrayInputStream bi) {
		int ret = 0;
		ret |= (bi.read() & 0xff);
		ret <<= 8;
		ret |= (bi.read() & 0xff);
		ret <<= 8;
		ret |= (bi.read() & 0xff);
		ret <<= 8;
		ret |= (bi.read() & 0xff);
		return ret;
	}

	public static void writeInt(ByteArrayOutputStream bo, int i) {
		bo.write((i >> 24) & 0xff);
		bo.write((i >> 16) & 0xff);
		bo.write((i >> 8) & 0xff);
		bo.write(i & 0xff);

	}

	public static void writeLong(ByteArrayOutputStream bo, long l) {
		for (int i = 56; i >= 0; i -= 8) {
			bo.write(((int) (l >> i)) & 0xff);
		}
	}

	public static long readLong(ByteArrayInputStream bi) {
		long ret = 0L;
		for (int i = 0; i < 8; i++) {
			ret <<= 8;
			ret |= (bi.read() & 0xff);
		}
		return ret;
	}

	public static byte[] readBytes(ByteArrayInputStream bi, int len) {
		byte[] ret = new byte[len];
		bi.read(ret, 0, len);
		return ret;
	}
}