com.healthmarketscience.jackcess.scsu
Class Expand

java.lang.Object
  com.healthmarketscience.jackcess.scsu.SCSU
      com.healthmarketscience.jackcess.scsu.Expand

public class Expand
extends SCSU

Reference decoder for the Standard Compression Scheme for Unicode (SCSU)

Notes on the Java implementation

A limitation of Java is the exclusive use of a signed byte data type. The following work arounds are required: Copying a byte to an integer variable and adding 256 for 'negative' bytes gives an integer in the range 0-255. Values of char are between 0x0000 and 0xFFFF in Java. Arithmetic on char values is unsigned. Extended characters require an int to store them. The sign is not an issue because only 1024*1024 + 65536 extended characters exist.

Constructor Summary

Expand()

Method Summary

int	bytesRead()
static char	charFromTwoBytes(byte hi, byte lo) assemble a char from two bytes In Java bytes are signed quantities, while chars are unsigned
int	charsWritten()
java.lang.String	expand(byte[] in) expand a byte array containing compressed Unicode
void	reset() reset is called to start with new input, w/o creating a new instance

Methods inherited from class com.healthmarketscience.jackcess.scsu.SCSU

isCompressible

Methods inherited from class java.lang.Object

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

Constructor Detail

Expand

public Expand()

Method Detail

charFromTwoBytes

public static char charFromTwoBytes(byte hi,
                                    byte lo)

assemble a char from two bytes In Java bytes are signed quantities, while chars are unsigned

Parameters:

hi - most significant byte

lo - least significant byte

Returns:

the character

expand

public java.lang.String expand(byte[] in)
                        throws IllegalInputException,
                               EndOfInputException

expand a byte array containing compressed Unicode

Throws:

IllegalInputException

EndOfInputException

reset

public void reset()

reset is called to start with new input, w/o creating a new instance

Overrides:

reset in class SCSU

charsWritten

public int charsWritten()

bytesRead

public int bytesRead()