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CRC32 (Java Platform SE 6)

















    






    

    



    
  
    
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java.util.zip

    
Class CRC32
    

    java.lang.Object
  extended by java.util.zip.CRC32

    

    

    All Implemented Interfaces: 
    Checksum
    

    

    

    

    public class CRC32
    extends Object
    implements Checksum

    A class that can be used to compute the CRC-32 of a data stream.

    See Also:
    Checksum

    Constructor Summary
    CRC32()
              Creates a new CRC32 object.
     
    Method Summary
     long getValue()
              Returns CRC-32 value.
     void reset()
              Resets CRC-32 to initial value.
     void update(byte[] b)
              Updates checksum with specified array of bytes.
     void update(byte[] b, int off, int len)
              Updates CRC-32 with specified array of bytes.
     void update(int b)
              Updates CRC-32 with specified byte.
     
    Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
     

    Constructor Detail

    CRC32

    public CRC32()
    Creates a new CRC32 object.

    Method Detail

    update

    public void update(int b)
    Updates CRC-32 with specified byte.

    Specified by:
    update in interface Checksum
    Parameters:
    b - the byte to update the checksum with

    update

    public void update(byte[] b,
                   int off,
                   int len)
    Updates CRC-32 with specified array of bytes.

    Specified by:
    update in interface Checksum
    Parameters:
    b - the byte array to update the checksum with
    off - the start offset of the data
    len - the number of bytes to use for the update

    update

    public void update(byte[] b)
    Updates checksum with specified array of bytes.

    Parameters:
    b - the array of bytes to update the checksum with

    reset

    public void reset()
    Resets CRC-32 to initial value.

    Specified by:
    reset in interface Checksum

    getValue

    public long getValue()
    Returns CRC-32 value.

    Specified by:
    getValue in interface Checksum
    Returns:
    the current checksum value
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