org.apache.xmlgraphics.image.loader.impl
Class JPEGFile

java.lang.Object
  org.apache.xmlgraphics.image.loader.impl.JPEGFile

All Implemented Interfaces:

JPEGConstants

public class JPEGFile
extends java.lang.Object
implements JPEGConstants

Provides methods useful for processing JPEG files.

Field Summary

protected static org.apache.commons.logging.Log

log logger

Fields inherited from interface org.apache.xmlgraphics.image.loader.impl.JPEGConstants

APP0, APP1, APP2, APPD, APPE, APPF, EOI, MARK, NULL, SOF0, SOF1, SOF2, SOFA, SOI, SOS

Constructor Summary

JPEGFile(javax.imageio.stream.ImageInputStream in)
Constructor for ImageInputStreams.

JPEGFile(java.io.InputStream in)
Constructor for InputStreams.

Method Summary

java.io.DataInput	getDataInput() Returns the DataInput instance this object operates on.
int	readMarkerSegment() Reads the next marker segment identifier and returns it.
int	readSegmentLength() Reads the segment length of the current marker segment and returns it.
void	skipCurrentMarkerSegment() Skips the current marker segment.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.apache.commons.logging.Log log

logger

Constructor Detail

JPEGFile

public JPEGFile(javax.imageio.stream.ImageInputStream in)

Constructor for ImageInputStreams.

Parameters:

in - the input stream to read the image from

JPEGFile

public JPEGFile(java.io.InputStream in)

Constructor for InputStreams.

Parameters:

in - the input stream to read the image from

Method Detail

getDataInput

public java.io.DataInput getDataInput()

Returns the DataInput instance this object operates on.

Returns:

the data input instance

readMarkerSegment

public int readMarkerSegment()
                      throws java.io.IOException

Reads the next marker segment identifier and returns it.

Returns:

the marker segment identifier

Throws:

java.io.IOException - if an I/O error occurs while reading from the image file

readSegmentLength

public int readSegmentLength()
                      throws java.io.IOException

Reads the segment length of the current marker segment and returns it. The method assumes the file cursor is right after the segment header.

Returns:

the segment length

Throws:

java.io.IOException - if an I/O error occurs while reading from the image file

skipCurrentMarkerSegment

public void skipCurrentMarkerSegment()
                              throws java.io.IOException

Skips the current marker segment. The method assumes the file cursor is right after the segment header.

Throws:

java.io.IOException - if an I/O error occurs while reading from the image file