typeconvert.java

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package com.huawei.insa2.util;

public class TypeConvert {

	public TypeConvert() {
	}

	public static int byte2int(byte b[], int offset) {
		return b[offset + 3] & 0xff | (b[offset + 2] & 0xff) << 8
				| (b[offset + 1] & 0xff) << 16 | (b[offset] & 0xff) << 24;
	}

	public static int byte2int(byte b[]) {
		return b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16
				| (b[0] & 0xff) << 24;
	}

	public static long byte2long(byte b[]) {
		return (long) b[7] & (long) 255 | ((long) b[6] & (long) 255) << 8
				| ((long) b[5] & (long) 255) << 16
				| ((long) b[4] & (long) 255) << 24
				| ((long) b[3] & (long) 255) << 32
				| ((long) b[2] & (long) 255) << 40
				| ((long) b[1] & (long) 255) << 48 | (long) b[0] << 56;
	}

	public static long byte2long(byte b[], int offset) {
		return (long) b[offset + 7] & (long) 255
				| ((long) b[offset + 6] & (long) 255) << 8
				| ((long) b[offset + 5] & (long) 255) << 16
				| ((long) b[offset + 4] & (long) 255) << 24
				| ((long) b[offset + 3] & (long) 255) << 32
				| ((long) b[offset + 2] & (long) 255) << 40
				| ((long) b[offset + 1] & (long) 255) << 48
				| (long) b[offset] << 56;
	}

	public static byte[] int2byte(int n) {
		byte b[] = new byte[4];
		b[0] = (byte) (n >> 24);
		b[1] = (byte) (n >> 16);
		b[2] = (byte) (n >> 8);
		b[3] = (byte) n;
		return b;
	}

	public static void int2byte(int n, byte buf[], int offset) {
		buf[offset] = (byte) (n >> 24);
		buf[offset + 1] = (byte) (n >> 16);
		buf[offset + 2] = (byte) (n >> 8);
		buf[offset + 3] = (byte) n;
	}

	public static byte[] short2byte(int n) {
		byte b[] = new byte[2];
		b[0] = (byte) (n >> 8);
		b[1] = (byte) n;
		return b;
	}

	public static void short2byte(int n, byte buf[], int offset) {
		buf[offset] = (byte) (n >> 8);
		buf[offset + 1] = (byte) n;
	}

	public static byte[] long2byte(long n) {
		byte b[] = new byte[8];
		b[0] = (byte) (int) (n >> 56);
		b[1] = (byte) (int) (n >> 48);
		b[2] = (byte) (int) (n >> 40);
		b[3] = (byte) (int) (n >> 32);
		b[4] = (byte) (int) (n >> 24);
		b[5] = (byte) (int) (n >> 16);
		b[6] = (byte) (int) (n >> 8);
		b[7] = (byte) (int) n;
		return b;
	}

	public static void long2byte(long n, byte buf[], int offset) {
		buf[offset] = (byte) (int) (n >> 56);
		buf[offset + 1] = (byte) (int) (n >> 48);
		buf[offset + 2] = (byte) (int) (n >> 40);
		buf[offset + 3] = (byte) (int) (n >> 32);
		buf[offset + 4] = (byte) (int) (n >> 24);
		buf[offset + 5] = (byte) (int) (n >> 16);
		buf[offset + 6] = (byte) (int) (n >> 8);
		buf[offset + 7] = (byte) (int) n;
	}

	public static long getLong(byte[] b, int off) {
		return ((b[off + 7] & 0xFFL) << 0) + ((b[off + 6] & 0xFFL) << 8)
				+ ((b[off + 5] & 0xFFL) << 16) + ((b[off + 4] & 0xFFL) << 24)
				+ ((b[off + 3] & 0xFFL) << 32) + ((b[off + 2] & 0xFFL) << 40)
				+ ((b[off + 1] & 0xFFL) << 48) + ((b[off + 0] & 0xFFL) << 56);
	}
}