Extracts short ints from byte array : Byte Array « File Input Output « Java

Extracts short ints from byte array


Copyright 2007 Creare Inc.

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 ***                                                           ***
 ***   Name : ByteConvert      ()                              ***
 ***   By   : Eric Friets      (Creare Inc., Hanover, NH)      ***
 ***   For  : FlyScan,DoeScan                                  ***
 ***   Date : December 1997,July 2000                          ***
 ***                                                           ***
 ***   Copyright 1997-2000 Creare Inc.                         ***
 ***                                                           ***
 ***   Description : extracts doubles, floats, short ints from ***
 ***                 byte arrays without using input streams,  ***
 ***                 and vice-versa                            ***
 ***                                                           ***
 ***   Input : primitive array                                 ***
 ***                                                           ***
 ***   Input/Output :                                          ***
 ***                                                           ***
 ***   Output :                                                ***
 ***                                                           ***
 ***   Returns : primitive array                               ***
 ***                                                           ***

// all methods are static

// using ByteArrayInputStream, DataInputStream, ByteArrayOutputStream,
// and DataOutputStream are too slow; code for direct reads/writes
// based on routines in the JVM ObjectInputStream and ObjectOutputStream
// source files

//package com.rbnb.utility;

 * Utility class to convert low level data types to and from byte arrays.

// 02/17/2003 WHF Added optional byte swapping on x2Byte methods.
public class ByteConvert {

  // byte2Short method - extracts short ints from byte array
  public static final short[] byte2Short(byte[] inData, boolean byteSwap) {
    // int j=0;
    int length = inData.length / 2;
    short[] outData = new short[length];
    if (!byteSwap)
      for (int i = 0, j = 0; i < length; i++, j += 2) {
        // j=i*2;
        // outData[i]=(short)( ((inData[j] & 0xff) << 8) + ((inData[j+1]
        // & 0xff) << 0 ) );
        outData[i] = (short) ((inData[j] << 8) + (inData[j + 1] & 0xff));
      for (int i = 0; i < length; i++) {
        int j = i * 2;
        outData[i] = (short) (((inData[j + 1] & 0xff) << 8) + ((inData[j] & 0xff) << 0));

    return outData;



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