Overview Package Class Use Source Tree Index Deprecated About
Prev Class | Next ClassFrames | No Frames
Summary: Nested | Field | Method | ConstrDetail: Nested | Field | Method | Constr

java.util.zip

Interface Checksum

Known Implementing Classes:
Adler32, CRC32
public interface Checksum
Interface to compute a data checksum used by checked input/output streams. A data checksum can be updated by one byte or with a byte array. After each update the value of the current checksum can be returned by calling getValue. The complete checksum object can also be reset so it can be used again with new data.
See Also:
CheckedInputStream, CheckedOutputStream

Method Summary

long
getValue()
Returns the data checksum computed so far.
void
reset()
Resets the data checksum as if no update was ever called.
void
update(byte[] buf, int off, int len)
Adds the byte array to the data checksum.
void
update(int bval)
Adds one byte to the data checksum.

Method Details

getValue

public long getValue()
Returns the data checksum computed so far.

reset

public void reset()
Resets the data checksum as if no update was ever called.

update

public void update(byte[] buf,
                   int off,
                   int len)
Adds the byte array to the data checksum.
Parameters:
buf - the buffer which contains the data
off - the offset in the buffer where the data starts
len - the length of the data

update

public void update(int bval)
Adds one byte to the data checksum.
Parameters:
bval - the data value to add. The high byte of the int is ignored.
Checksum.java - Interface to compute a data checksum Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

Overview Package Class Use Source Tree Index Deprecated About