Package com.drew.imaging.jpeg

Class JpegSegmentReader

java.lang.Object

com.drew.imaging.jpeg.JpegSegmentReader

public class JpegSegmentReader
extends Object

Performs read functions of JPEG files, returning specific file segments.

JPEG files are composed of a sequence of consecutive JPEG 'segments'. Each is identified by one of a set of byte values, modelled in the JpegSegmentType enumeration. Use readSegments to read out the some or all segments into a JpegSegmentData object, from which the raw JPEG segment byte arrays may be accessed.

Author:

Drew Noakes https://drewnoakes.com

Method Summary

Modifier and Type	Method	Description
static JpegSegmentData	readSegments(SequentialReader reader, Iterable<JpegSegmentType> segmentTypes)	Processes the provided JPEG data, and extracts the specified JPEG segments into a JpegSegmentData object.
static JpegSegmentData	readSegments(File file, Iterable<JpegSegmentType> segmentTypes)	Processes the provided JPEG data, and extracts the specified JPEG segments into a JpegSegmentData object.

Methods inherited from class java.lang.Object

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

Method Details

readSegments

public static JpegSegmentData readSegments(File file,
 Iterable<JpegSegmentType> segmentTypes)
                                    throws JpegProcessingException,
IOException

Processes the provided JPEG data, and extracts the specified JPEG segments into a JpegSegmentData object.

Will not return SOS (start of scan) or EOI (end of image) segments.

Parameters:

file - a File from which the JPEG data will be read.

segmentTypes - the set of JPEG segments types that are to be returned. If this argument is null then all found segment types are returned.

Throws:

JpegProcessingException

IOException

readSegments

public static JpegSegmentData readSegments(SequentialReader reader,
 Iterable<JpegSegmentType> segmentTypes)
                                    throws JpegProcessingException,
IOException

Processes the provided JPEG data, and extracts the specified JPEG segments into a JpegSegmentData object.

Will not return SOS (start of scan) or EOI (end of image) segments.

Parameters:

reader - a SequentialReader from which the JPEG data will be read. It must be positioned at the beginning of the JPEG data stream.

segmentTypes - the set of JPEG segments types that are to be returned. If this argument is null then all found segment types are returned.

Throws:

JpegProcessingException

IOException