freenet.crypt

Class CRCChecksumChecker

java.lang.Object

freenet.crypt.ChecksumChecker

freenet.crypt.CRCChecksumChecker

public class CRCChecksumChecker
extends ChecksumChecker

Field Summary

Fields inherited from class freenet.crypt.ChecksumChecker

CHECKSUM_CRC

Constructor Summary

Constructors

Constructor and Description
CRCChecksumChecker()

Method Summary

Modifier and Type	Method and Description
byte[]	appendChecksum(byte[] data)
boolean	checkChecksum(byte[] data, int offset, int length, byte[] checksum) Verify a checksum or report.
int	checksumLength() Get the length of the checksum
java.io.OutputStream	checksumWriter(java.io.OutputStream os, int prefix) Get an OutputStream that will write a checksum when closed.
void	copyAndStripChecksum(java.io.InputStream is, java.io.OutputStream destination, long length) Copy bytes from one stream to another, verifying and stripping the final checksum.
byte[]	generateChecksum(byte[] data, int offset, int length)
int	getChecksumTypeID()
void	readAndChecksum(java.io.DataInput is, byte[] buf, int offset, int length) Read from disk and verify the checksum that follows the data.

Methods inherited from class freenet.crypt.ChecksumChecker

checksumReaderWithLength, checksumWriter, checksumWriterWithLength, create, generateChecksum, lengthAndChecksumOverhead, verifyChecksum, writeAndChecksum, writeAndChecksum

Methods inherited from class java.lang.Object

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

Constructor Detail

CRCChecksumChecker

public CRCChecksumChecker()

Method Detail

checksumLength

public int checksumLength()

Description copied from class: ChecksumChecker

Get the length of the checksum

Specified by:

checksumLength in class ChecksumChecker

checksumWriter

public java.io.OutputStream checksumWriter(java.io.OutputStream os,
                                           int prefix)

Description copied from class: ChecksumChecker

Get an OutputStream that will write a checksum when closed. It will not close the underlying stream.

Specified by:

checksumWriter in class ChecksumChecker

checkChecksum

public boolean checkChecksum(byte[] data,
                             int offset,
                             int length,
                             byte[] checksum)

Description copied from class: ChecksumChecker

Verify a checksum or report.

Specified by:

checkChecksum in class ChecksumChecker

Returns:

True if the checksum is correct, false otherwise.

appendChecksum

public byte[] appendChecksum(byte[] data)

Specified by:

appendChecksum in class ChecksumChecker

generateChecksum

public byte[] generateChecksum(byte[] data,
                               int offset,
                               int length)

Specified by:

generateChecksum in class ChecksumChecker

getChecksumTypeID

public int getChecksumTypeID()

Specified by:

getChecksumTypeID in class ChecksumChecker

copyAndStripChecksum

public void copyAndStripChecksum(java.io.InputStream is,
                                 java.io.OutputStream destination,
                                 long length)
                          throws java.io.IOException,
                                 ChecksumFailedException

Description copied from class: ChecksumChecker

Copy bytes from one stream to another, verifying and stripping the final checksum.

Specified by:

copyAndStripChecksum in class ChecksumChecker

Throws:

java.io.IOException

ChecksumFailedException

readAndChecksum

public void readAndChecksum(java.io.DataInput is,
                            byte[] buf,
                            int offset,
                            int length)
                     throws java.io.IOException,
                            ChecksumFailedException

Description copied from class: ChecksumChecker

Read from disk and verify the checksum that follows the data. If it throws, the buffer will be zero'ed out.

Specified by:

readAndChecksum in class ChecksumChecker

Throws:

java.io.IOException

ChecksumFailedException