org.jwat.common

Class DigestInputStreamNoSkip

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

java.security.DigestInputStream

org.jwat.common.DigestInputStreamNoSkip

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class DigestInputStreamNoSkip
extends java.security.DigestInputStream

The standard DigestInputStream does not update the digest when performing a skip operation. Since this is completely useless in most situations, the following implementation remedies this.

Author:

nicl

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	skip_read_buffer Read buffer used by the skip method.
static int	SKIP_READ_BUFFER_SIZE Buffer size to use when read skipping.

Fields inherited from class java.security.DigestInputStream

digest

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
DigestInputStreamNoSkip(java.io.InputStream stream, java.security.MessageDigest digest) Construct a DigestInputStream with the skip method overridden.

Method Summary

Modifier and Type	Method and Description
void	mark(int readlimit)
boolean	markSupported()
void	reset()
long	skip(long n)

Methods inherited from class java.security.DigestInputStream

getMessageDigest, on, read, read, setMessageDigest, toString

Methods inherited from class java.io.FilterInputStream

available, close, read

Methods inherited from class java.lang.Object

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

Field Detail

SKIP_READ_BUFFER_SIZE

public static final int SKIP_READ_BUFFER_SIZE

Buffer size to use when read skipping.

See Also:

Constant Field Values

skip_read_buffer

protected byte[] skip_read_buffer

Read buffer used by the skip method.

Constructor Detail

DigestInputStreamNoSkip

public DigestInputStreamNoSkip(java.io.InputStream stream,
                               java.security.MessageDigest digest)

Construct a DigestInputStream with the skip method overridden.

Parameters:

stream - input stream to digest

digest - digest implementation to use

Method Detail

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.FilterInputStream

mark

public void mark(int readlimit)

Overrides:

mark in class java.io.FilterInputStream

reset

public void reset()
           throws java.io.IOException

Overrides:

reset in class java.io.FilterInputStream

Throws:

java.io.IOException

skip

public long skip(long n)
          throws java.io.IOException

Overrides:

skip in class java.io.FilterInputStream

Throws:

java.io.IOException