com.siemens.ct.exi.core.io

Class BitInputStream

java.lang.Object

com.siemens.ct.exi.core.io.BitInputStream

public final class BitInputStream
extends Object

Read bits and bytes from an underlying input stream.

Author:

Daniel.Peintner.EXT@siemens.com, Richard.Kuntschke@siemens.com

Field Summary

Fields

Modifier and Type	Field and Description
static int	BUFFER_CAPACITY

Constructor Summary

Constructors

Constructor and Description
BitInputStream(InputStream istream) Construct an instance of this class from an input stream.

Method Summary

Modifier and Type	Method and Description
void	align() Discard any bits currently in the buffer to byte-align stream
int	lookAhead() Returns current byte buffer without actually reading data
int	read() Reads one byte (8 bits) of data from the input stream
void	read(byte[] b, int off, int len)
int	readBit() Return next bit from underlying stream.
int	readBits(int n) Read the next n bits and return the result as an integer.
void	setInputStream(InputStream istream) Resets this instance and sets a new underlying input stream.
void	skip(long n) Skip n bytes

Methods inherited from class java.lang.Object

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

Field Detail

BUFFER_CAPACITY

public static final int BUFFER_CAPACITY

See Also:

Constant Field Values

Constructor Detail

BitInputStream

public BitInputStream(InputStream istream)

Construct an instance of this class from an input stream.

Parameters:

istream - input stream

Method Detail

setInputStream

public void setInputStream(InputStream istream)

Resets this instance and sets a new underlying input stream. This method allows instances of this class to be re-used. The resulting state after calling this method is identical to that of a newly created instance.

Parameters:

istream - input stream

align

public void align()
           throws IOException

Discard any bits currently in the buffer to byte-align stream

Throws:

IOException - IO exception

lookAhead

public int lookAhead()
              throws IOException

Returns current byte buffer without actually reading data

Returns:

lookAhead byte

Throws:

IOException - IO exception

skip

public void skip(long n)
          throws IOException

Skip n bytes

Parameters:

n - bytes

Throws:

IOException - IO exception

readBit

public int readBit()
            throws IOException

Return next bit from underlying stream.

Returns:

read bit

Throws:

IOException - IO exception

readBits

public int readBits(int n)
             throws IOException

Read the next n bits and return the result as an integer.

Parameters:

n - The number of bits in the range [1,32].

Returns:

nbit value

Throws:

IOException - IO exception

read

public final int read()
               throws IOException

Reads one byte (8 bits) of data from the input stream

Returns:

next byte as int

Throws:

IOException - IO exception

read

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

Throws:

IOException