Package org.appng.tools.file

Class MagicByteCheck

java.lang.Object

org.appng.tools.file.MagicByteCheck

public class MagicByteCheck
extends Object

This is an utility class to to check the type of file by probing the magic bytes.

Author:

Claus Stümke, aiticon GmbH, 2016

Constructor Summary

Constructors

Constructor	Description
MagicByteCheck()

Method Summary

Modifier and Type	Method	Description
static boolean	compareFileExtensionWithMagicBytes(File sourceFile)	It checks the magic bytes of the file and compares the extension by magic byte match with the extension in the file name.
static String	getExtensionByMagicBytes(File file)	Retrieves the file's extension by magic byte detection.

Methods inherited from class java.lang.Object

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

Constructor Detail

MagicByteCheck

public MagicByteCheck()

Method Detail

compareFileExtensionWithMagicBytes

public static boolean compareFileExtensionWithMagicBytes(File sourceFile)

It checks the magic bytes of the file and compares the extension by magic byte match with the extension in the file name. The magic byte match is not available for text files. Because here it is not possible to distinguish .csv from .txt files. The magic byte is the same. It is also not functioning reliable for MS Office or OpenOffice files. The method is tested for image files such as jpg, png and bmp. Please test this utility for other file types first.

Parameters:

sourceFile - the file to check

Returns:

true if the extension of the file is equal with the determined extension from magic bytes.

Throws:

IllegalArgumentException - if there is any issue reading the file

getExtensionByMagicBytes

public static String getExtensionByMagicBytes(File file)

Retrieves the file's extension by magic byte detection.

Parameters:

file - the file to check

Throws:

IllegalArgumentException - if there is any issue reading the file