org.apache.poi.util

Class RLEDecompressingInputStream

java.lang.Object

java.io.InputStream

org.apache.poi.util.RLEDecompressingInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class RLEDecompressingInputStream
extends InputStream

Wrapper of InputStream which provides Run Length Encoding (RLE) decompression on the fly. Uses MS-OVBA decompression algorithm. See http://download.microsoft.com/download/2/4/8/24862317-78F0-4C4B-B355-C7B2C1D997DB/[MS-OVBA].pdf

Constructor Summary

Constructors

Constructor and Description
RLEDecompressingInputStream(InputStream in) Creates a new wrapper RLE Decompression InputStream.

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
static byte[]	decompress(byte[] compressed)
static byte[]	decompress(byte[] compressed, int offset, int length)
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int l)
int	readInt() Convenience method for read a 4-bytes int in little endian encoding.
int	readShort() Convenience method for read a 2-bytes short in little endian encoding.
long	skip(long n)

Methods inherited from class java.io.InputStream

mark, markSupported, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

RLEDecompressingInputStream

public RLEDecompressingInputStream(InputStream in)
                            throws IOException

Creates a new wrapper RLE Decompression InputStream.

Parameters:

in - The stream to wrap with the RLE Decompression

Throws:

IOException

Method Detail

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b,
                int off,
                int l)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class InputStream

Throws:

IOException

available

public int available()

Overrides:

available in class InputStream

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream

Throws:

IOException

readShort

public int readShort()
              throws IOException

Convenience method for read a 2-bytes short in little endian encoding.

Returns:

short value from the stream, -1 if end of stream is reached

Throws:

IOException

readInt

public int readInt()
            throws IOException

Convenience method for read a 4-bytes int in little endian encoding.

Returns:

integer value from the stream, -1 if end of stream is reached

Throws:

IOException

decompress

public static byte[] decompress(byte[] compressed)
                         throws IOException

Throws:

IOException

decompress

public static byte[] decompress(byte[] compressed,
                                int offset,
                                int length)
                         throws IOException

Throws:

IOException