com.goldencode.p2j.ui

Class ImageExtractor.GifFileReader.ExtensionReader

java.lang.Object

com.goldencode.p2j.ui.ImageExtractor.GifFileReader.ExtensionReader

Direct Known Subclasses:

ImageExtractor.GifFileReader.ApplicationExtensionReader, ImageExtractor.GifFileReader.CommentExtensionReader, ImageExtractor.GifFileReader.GraphicsControlExtensionReader, ImageExtractor.GifFileReader.PlainTextExtensionReader

Enclosing class:

ImageExtractor.GifFileReader

abstract class ImageExtractor.GifFileReader.ExtensionReader
extends java.lang.Object

Defines common methods to detect GIF extension section.

Constructor Summary

Constructors

Constructor and Description
ExtensionReader()

Method Summary

Modifier and Type	Method and Description
abstract boolean	hasSignature(byte firstByte, byte secondByte) Tests that the given two bytes match this extension signature.
abstract boolean	skipBlock(java.io.RandomAccessFile raf) Skip the target block of GIF data.
boolean	testExtension(java.io.RandomAccessFile raf) Tests if the following data can represent the target extension section of GIF image.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtensionReader

ExtensionReader()

Method Detail

hasSignature

public abstract boolean hasSignature(byte firstByte,
                                     byte secondByte)

Tests that the given two bytes match this extension signature.

Parameters:

firstByte - The first byte of the two bytes signature

secondByte - The second byte of the two bytes signature

Returns:

True iff the given two bytes match this section signature.

skipBlock

public abstract boolean skipBlock(java.io.RandomAccessFile raf)
                           throws java.io.IOException

Skip the target block of GIF data.

Parameters:

raf - The data represented by the random access file

Returns:

True iff this operation has been completed successfully.

Throws:

java.io.IOException - If IO error occurs during this reading operation.

testExtension

public boolean testExtension(java.io.RandomAccessFile raf)
                      throws java.io.IOException

Tests if the following data can represent the target extension section of GIF image.

Parameters:

raf - The data represented by the random access file

Returns:

True iff this operation has been completed successfully.

Throws:

java.io.IOException - If IO error occurs while reading data and moving the current file pointer.