jj2000.j2k.entropy.encoder

Class ByteOutputBuffer

java.lang.Object

jj2000.j2k.entropy.encoder.ByteOutputBuffer

public class ByteOutputBuffer
extends Object

This class provides a buffering output stream similar to ByteArrayOutputStream, with some additional methods.

Once an array has been written to an output stream or to a byte array, the object can be reused as a new stream if the reset() method is called.

Unlike the ByteArrayOutputStream class, this class is not thread safe.

See Also:

reset()

Field Summary

Fields

Modifier and Type	Field and Description
(package private) byte[]	buf The buffer where the data is stored
static int	BUF_DEF_LEN The default initial buffer size
static int	BUF_INC The buffer increase size
(package private) int	count The number of valid bytes in the buffer

Constructor Summary

Constructors

Constructor and Description
ByteOutputBuffer() Creates a new byte array output stream.
ByteOutputBuffer(int size) Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Method Summary

Modifier and Type	Method and Description
int	getByte(int pos) Returns the byte buffered at the given position in the buffer.
void	reset() Discards all the buffered data, by resetting the counter of written bytes to 0.
int	size() Returns the number of valid bytes in the output buffer (count class variable).
void	toByteArray(int off, int len, byte[] outbuf, int outoff) Copies the specified part of the stream to the 'outbuf' byte array.
void	write(int b) Writes the specified byte to this byte array output stream.

Methods inherited from class java.lang.Object

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

Field Detail

buf

byte[] buf

The buffer where the data is stored

count

int count

The number of valid bytes in the buffer

BUF_INC

public static final int BUF_INC

The buffer increase size

See Also:

Constant Field Values

BUF_DEF_LEN

public static final int BUF_DEF_LEN

The default initial buffer size

See Also:

Constant Field Values

Constructor Detail

ByteOutputBuffer

public ByteOutputBuffer()

Creates a new byte array output stream. The buffer capacity is initially BUF_DEF_LEN bytes, though its size increases if necessary.

ByteOutputBuffer

public ByteOutputBuffer(int size)

Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Parameters:

size - the initial size.

Method Detail

write

public final void write(int b)

Writes the specified byte to this byte array output stream. The functionality provided by this implementation is the same as for the one in the superclass, however this method is not synchronized and therefore not safe thread, but faster.

Parameters:

b - The byte to write

toByteArray

public void toByteArray(int off,
                        int len,
                        byte[] outbuf,
                        int outoff)

Copies the specified part of the stream to the 'outbuf' byte array.

Parameters:

off - The index of the first element in the stream to copy.

len - The number of elements of the array to copy

outbuf - The destination array

outoff - The index of the first element in 'outbuf' where to write the data.

size

public int size()

Returns the number of valid bytes in the output buffer (count class variable).

Returns:

The number of bytes written to the buffer

reset

public void reset()

Discards all the buffered data, by resetting the counter of written bytes to 0.

getByte

public int getByte(int pos)

Returns the byte buffered at the given position in the buffer. The position in the buffer is the index of the 'write()' method call after the last call to 'reset()'.

Parameters:

pos - The position of the byte to return

Returns:

The value (betweeb 0-255) of the byte at position 'pos'.