gov.nasa.pds.web.ui.utils

Class BinaryPDS4ConversionUtils

java.lang.Object

gov.nasa.pds.web.ui.utils.BinaryPDS4ConversionUtils

public class BinaryPDS4ConversionUtils
extends Object

Helper class to convert between PDS4 data types

Author:

ghflore1

Constructor Summary

Constructors

Constructor and Description
BinaryPDS4ConversionUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static long	convertByte(byte[] b, int n) Converts an array of bytes into a long, permitting unsigned bytes.
static int	convertByteArrayToInt(byte[] b) Convert a byte array of size 4 bytes to type int
static long	convertByteArrayToLong(byte[] b) Convert a byte array of size 8 bytes to type long
static short	convertByteArrayToShort(byte[] b) Convert a byte array of size 2 bytes to type short
static long	convertSignedLSBIntegers(byte[] b, int n) Converts an array of bytes into an int.
static long	convertSignedMSBIntegers(byte[] b, int n) Converts an array of bytes into an int.
static long	convertUnsignedLSBIntegers(byte[] b, int n) Converts an array of bytes into a long, permitting unsigned bytes.
static long	convertUnsignedMSBIntegers(byte[] b, int n) Converts an array of bytes into a long, permitting unsigned bytes.
static long	IEEE754LSBToIEEE754MSBDouble(byte[] b) Convert from IEEE754LSBDouble type to IEEE754MSBDouble precision
static int	IEEE754LSBToIEEE754MSBSingle(byte[] b) Convert from IEEE754LSBSingle type to IEEE754MSBSingle precision

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BinaryPDS4ConversionUtils

public BinaryPDS4ConversionUtils()

Method Detail

convertSignedLSBIntegers

public static long convertSignedLSBIntegers(byte[] b,
                            int n)

Converts an array of bytes into an int. The array of bytes may be of length 1, 2, 3, or 4, in little-endian order. That is, b[n-1] holds the most significant bits, b[n-1] the least. The bytes are assumed to be signed.

Parameters:

b - the array of bytes, in little-endian order

n - the number of bytes to convert in the array, from 1 to the size of an int

Returns:

the signed int value represented by the bytes

convertUnsignedLSBIntegers

public static long convertUnsignedLSBIntegers(byte[] b,
                              int n)

Converts an array of bytes into a long, permitting unsigned bytes. The array of bytes may be of length 1, 2, 3, or 4, in big-endian order. That is, b[0] holds the most significant bits, b[n-1] the least.

Parameters:

b - the array of bytes, in big-endian order

n - the number of bytes to convert in the array, from 1 to the size of an int

Returns:

the signed int value represented by the bytes

convertSignedMSBIntegers

public static long convertSignedMSBIntegers(byte[] b,
                            int n)

Converts an array of bytes into an int. The array of bytes may be of length 1, 2, 3, or 4, in big-endian order. That is, b[0] holds the most significant bits, b[n-1] the least. The bytes are assumed to be signed.

Parameters:

b - the array of bytes, in big-endian order

n - the number of bytes to convert in the array, from 1 to the size of an int

Returns:

the signed int value represented by the bytes

convertUnsignedMSBIntegers

public static long convertUnsignedMSBIntegers(byte[] b,
                              int n)

Converts an array of bytes into a long, permitting unsigned bytes. The array of bytes may be of length 2, 4, or 8, in big-endian order. That is, b[0] holds the most significant bits, b[n-1] the least.

Parameters:

b - the array of bytes, in big-endian order

n - the number of bytes to convert in the array, from 1 to the size of an int

Returns:

the signed int value represented by the bytes

convertByte

public static long convertByte(byte[] b,
               int n)

Converts an array of bytes into a long, permitting unsigned bytes. The array of bytes is of size 1 byte

Parameters:

b - the array of bytes, in big-endian order

n - the number of bytes to convert in the array, from 1 to the size of an int

Returns:

the signed int value represented by the bytes

convertByteArrayToLong

public static long convertByteArrayToLong(byte[] b)

Convert a byte array of size 8 bytes to type long

Parameters:

b: - byte array of size 8 bytes

Returns:

long representation of the byte array Note: Need to type cast to type long since cannot shift pass 31 bits

convertByteArrayToInt

public static int convertByteArrayToInt(byte[] b)

Convert a byte array of size 4 bytes to type int

Parameters:

b: - byte array if size 4 bytes

Returns:

int representation of the byte array

convertByteArrayToShort

public static short convertByteArrayToShort(byte[] b)

Convert a byte array of size 2 bytes to type short

Parameters:

b: - byte array if size 2 bytes

Returns:

shot representation of the byte array

IEEE754LSBToIEEE754MSBSingle

public static int IEEE754LSBToIEEE754MSBSingle(byte[] b)

Convert from IEEE754LSBSingle type to IEEE754MSBSingle precision

Parameters:

b - - byte array of size 4 bytes

Returns:

The byte array in integer format

IEEE754LSBToIEEE754MSBDouble

public static long IEEE754LSBToIEEE754MSBDouble(byte[] b)

Convert from IEEE754LSBDouble type to IEEE754MSBDouble precision

Parameters:

b - - byte array of size 8 bytes

Returns:

Byte array in long type