de.flashweather.io.util
Class BitInputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--java.io.FilterInputStream
              |
              +--de.flashweather.io.util.BitInputStream

public class BitInputStream

extends java.io.FilterInputStream

This class is an input stream wrapper that can read a specific number of bytes and bits from an input stream.

Author:

Benjamin Stark

Field Summary

protected int	bitBuf Buffer for one byte which will be processed bit by bit.
protected int	bitPos Current bit position in bitBuf.

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

BitInputStream(java.io.InputStream in)
Constructs a bit input stream from an InputStream object.

Method Summary

byte[]	read(int length) Read specific number of bytes from the input stream.
int	readSBits(int numBits) Read a signed value from the given number of bits
long	readUBits(int numBits) Read an unsigned value from the given number of bits.
int	readUI8() Read an unsigned 8 bit value.
int[]	readUI8(int length) Read specific number of unsigned bytes from the input stream.

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, read, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

bitBuf

protected int bitBuf

Buffer for one byte which will be processed bit by bit.

bitPos

protected int bitPos

Current bit position in bitBuf.

Constructor Detail

BitInputStream

public BitInputStream(java.io.InputStream in)

Constructs a bit input stream from an InputStream object.

Parameters:

in - input stream that will be wrapped

Method Detail

readUI8

public int readUI8()
            throws java.io.IOException

Read an unsigned 8 bit value.

Returns:

unsigned 8 bit value as integer

readUI8

public int[] readUI8(int length)
              throws java.io.IOException

Read specific number of unsigned bytes from the input stream.

Parameters:

lenth - number of bytes to read and return as integers

Returns:

unsigned bytes as integer values

read

public byte[] read(int length)
            throws java.io.IOException

Read specific number of bytes from the input stream.

Parameters:

length - number of bytes to read

Returns:

array of read bytes

readUBits

public long readUBits(int numBits)
               throws java.io.IOException

Read an unsigned value from the given number of bits.

Parameters:

numBits - number of bits used for the unsigned value

Returns:

value read from numBits bits as long

readSBits

public int readSBits(int numBits)
              throws java.io.IOException

Read a signed value from the given number of bits

Parameters:

numBits - number of bits used for the signed value

Returns:

value read from numBits bits as integer