com.goldencode.p2j.ui

Class ImageExtractor.GifFileReader.HeaderReader

java.lang.Object

com.goldencode.p2j.ui.ImageExtractor.GifFileReader.HeaderReader

Enclosing class:

ImageExtractor.GifFileReader

class ImageExtractor.GifFileReader.HeaderReader
extends java.lang.Object

Represents the GIF header section recognizer.

Constructor Summary

Constructors

Constructor and Description
HeaderReader()

Method Summary

Modifier and Type	Method and Description
boolean	hasSignature(byte firstByte, byte secondByte, byte thirdByte) Tests that the given first three bytes match the GIF signature.
boolean	hasVersion(byte firstByte, byte secondByte, byte thirdByte) Tests that the given next three bytes match the correct GIF version.
boolean	testHeader(java.io.RandomAccessFile raf) Tests if the first six sequential bytes form the GIF Header.

Methods inherited from class java.lang.Object

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

Constructor Detail

HeaderReader

HeaderReader()

Method Detail

testHeader

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

Tests if the first six sequential bytes form the GIF Header.

Parameters:

raf - The data represented by the random access file

Returns:

True iff the first six sequential bytes form the GIF Header, otherwise false.

Throws:

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

hasSignature

public boolean hasSignature(byte firstByte,
                            byte secondByte,
                            byte thirdByte)

Tests that the given first three bytes match the GIF signature.

Parameters:

firstByte - The first byte to match

secondByte - The second byte to match

thirdByte - The third byte to match

Returns:

True iff the given first three bytes match the GIF signature, otherwise false.

hasVersion

public boolean hasVersion(byte firstByte,
                          byte secondByte,
                          byte thirdByte)

Tests that the given next three bytes match the correct GIF version.

Parameters:

firstByte - The first byte to match

secondByte - The second byte to match

thirdByte - The third byte to match

Returns:

True iff the given next three bytes match the correct GIF version, otherwise false.