net.sf.zipme
Interface Checksum

All 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 Detail

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(int bval)

Adds one byte to the data checksum.

Parameters:

bval - the data value to add. The high byte of the int is ignored.

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