Module openj9.dtfj

Package com.ibm.dtfj.utils.file

Class FileSniffer

java.lang.Object

com.ibm.dtfj.utils.file.FileSniffer

public class FileSniffer
extends Object

Sniffs files attempting to determine the contents, typically from known magic numbers/values.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	FileSniffer.CoreFormatType

Constructor Summary

Constructors

Constructor	Description
FileSniffer()

Method Summary

Modifier and Type	Method	Description
static FileSniffer.CoreFormatType	getCoreFormat(ImageInputStream iis)	Determine the format of the core file.
static boolean	isCoreFile(InputStream in, long filesize)
static boolean	isCoreFile(ImageInputStream iis, long filesize)
static boolean	isJavaCoreFile(InputStream in, long filesize)
static boolean	isJavaCoreFile(ImageInputStream iis, long filesize)
static boolean	isPHDFile(InputStream in, long filesize)
static boolean	isPHDFile(ImageInputStream iis, long filesize)
static boolean	isZipFile(File file)
static boolean	isZipFile(ImageInputStream iis)	Checks to see if the input stream is for a zip file, assumes that the stream is correctly positioned.

Methods declared in class java.lang.Object

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

Constructor Details

FileSniffer

public FileSniffer()

Method Details

getCoreFormat

public static FileSniffer.CoreFormatType getCoreFormat(ImageInputStream iis)
                                                throws IOException

Determine the format of the core file.

Parameters:

iis - stream to the core file

Returns:

format

Throws:

IOException - re-thrown

isCoreFile

public static boolean isCoreFile(InputStream in,
 long filesize)
                          throws IOException

Throws:

IOException

isCoreFile

public static boolean isCoreFile(ImageInputStream iis,
 long filesize)
                          throws IOException

Throws:

IOException

isJavaCoreFile

public static boolean isJavaCoreFile(InputStream in,
 long filesize)
                              throws IOException

Throws:

IOException

isJavaCoreFile

public static boolean isJavaCoreFile(ImageInputStream iis,
 long filesize)
                              throws IOException

Throws:

IOException

isPHDFile

public static boolean isPHDFile(InputStream in,
 long filesize)
                         throws IOException

Throws:

IOException

isPHDFile

public static boolean isPHDFile(ImageInputStream iis,
 long filesize)
                         throws IOException

Throws:

IOException

isZipFile

public static boolean isZipFile(ImageInputStream iis)
                         throws IOException

Checks to see if the input stream is for a zip file, assumes that the stream is correctly positioned. This method will reset the stream if possible to it's starting position. The reason for using this method over just trying java.util.zip.ZipFile(File) and catching errors is that on some platforms the zip support is provided by native libraries. It is possible to cause the native library to crash when speculatively passing files into it.

Parameters:

in - stream to analyze

Returns:

true if it is a zip file

Throws:

IOException

isZipFile

public static boolean isZipFile(File file)
                         throws IOException

Throws:

IOException