Package com.drew.imaging.jpeg

Class JpegSegmentReader

java.lang.Object

com.drew.imaging.jpeg.JpegSegmentReader

public class JpegSegmentReader
extends java.lang.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.

Method Summary

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

readSegments

public static JpegSegmentData readSegments(java.io.File file,
                                           java.lang.Iterable<JpegSegmentType> segmentTypes)
                                    throws JpegProcessingException,
                                           java.io.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

java.io.IOException

readSegments

public static JpegSegmentData readSegments(SequentialReader reader,
                                           java.lang.Iterable<JpegSegmentType> segmentTypes)
                                    throws JpegProcessingException,
                                           java.io.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

java.io.IOException