com.levigo.jbig2.io

Class SubInputStream

java.lang.Object

javax.imageio.stream.ImageInputStreamImpl

com.levigo.jbig2.io.SubInputStream

All Implemented Interfaces:

Closeable, DataInput, AutoCloseable, ImageInputStream

public class SubInputStream
extends ImageInputStreamImpl

A wrapper for an ImageInputStream which is able to provide a view of a specific part of the wrapped stream. Read accesses to the wrapped stream are synchronized, so that users of this stream need to deal with synchronization against other users of the same instance, but not against other users of the wrapped stream.

Author:

Matthäus Krzikalla, Benjamin Zindel

Field Summary

Fields

Modifier and Type	Field and Description
protected long	length The length of the window.
protected long	offset The position in the wrapped stream at which the window starts.
protected ImageInputStream	wrappedStream

Fields inherited from class javax.imageio.stream.ImageInputStreamImpl

bitOffset, byteOrder, flushedPos, streamPos

Constructor Summary

Constructors

Constructor and Description
SubInputStream(ImageInputStream iis, long offset, long length) Construct a new SubInputStream which provides a view of the wrapped stream.

Method Summary

Methods

Modifier and Type	Method and Description
long	length()
int	read()
int	read(byte[] b, int off, int len)
void	skipBits() Skips remaining bits in the current byte.

Methods inherited from class javax.imageio.stream.ImageInputStreamImpl

checkClosed, close, finalize, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, mark, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, seek, setBitOffset, setByteOrder, skipBytes, skipBytes

Methods inherited from class java.lang.Object

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

Field Detail

wrappedStream

protected final ImageInputStream wrappedStream

offset

protected final long offset

The position in the wrapped stream at which the window starts. Offset is an absolut value.

length

protected final long length

The length of the window. Length is an relative value.

Constructor Detail

SubInputStream

public SubInputStream(ImageInputStream iis,
              long offset,
              long length)

Construct a new SubInputStream which provides a view of the wrapped stream.

Parameters:

iis - - The stream to be wrapped.

offset - - The absolute position in the wrapped stream at which the sub-stream starts.

length - - The length of the sub-stream.

Method Detail

read

public int read()
         throws IOException

Specified by:

read in interface ImageInputStream

Specified by:

read in class ImageInputStreamImpl

Throws:

IOException

read

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

Specified by:

read in interface ImageInputStream

Specified by:

read in class ImageInputStreamImpl

Throws:

IOException

length

public long length()

Specified by:

length in interface ImageInputStream

Overrides:

length in class ImageInputStreamImpl

skipBits

public void skipBits()

Skips remaining bits in the current byte.