Class CRC32C

java.lang.Object
java.util.zip.CRC32C
All Implemented Interfaces:
Checksum
public final class CRC32C extends Object implements Checksum
A class that can be used to compute the CRC-32C of a data stream.

CRC-32C is defined in RFC 3720: Internet Small Computer Systems Interface (iSCSI).

Passing a null argument to a method in this class will cause a NullPointerException to be thrown.

Since:
9
External Specifications

  • Constructor Summary

    Constructors
    Constructor
    Description
    CRC32C()
    Creates a new CRC32C object.

  • Method Summary

    Modifier and Type
    Method
    Description
    long
    getValue()
    Returns CRC-32C value.
    void
    reset()
    Resets CRC-32C to initial value.
    void
    update(byte[] b, int off, int len)
    Updates the CRC-32C checksum with the specified array of bytes.
    void
    update(int b)
    Updates the CRC-32C checksum with the specified byte (the low eight bits of the argument b).
    void
    update(ByteBuffer buffer)
    Updates the CRC-32C checksum with the bytes from the specified buffer.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

    Methods declared in interface Checksum

    update
    Modifier and Type
    Method
    Description
    default void
    update(byte[] b)
    Updates the current checksum with the specified array of bytes.

  • Constructor Details

    • CRC32C

      public CRC32C()
      Creates a new CRC32C object.

  • Method Details

    • update

      public void update(int b)
      Updates the CRC-32C checksum with the specified byte (the low eight bits of the argument b).
      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 the CRC-32C checksum with the 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
      Throws:
      ArrayIndexOutOfBoundsException - if off is negative, or len is negative, or off+len is negative or greater than the length of the array b.

    • update

      public void update(ByteBuffer buffer)
      Updates the CRC-32C checksum with the bytes from the specified buffer. The checksum is updated with the remaining bytes in the buffer, starting at the buffer's position. Upon return, the buffer's position will be updated to its limit; its limit will not have been changed.
      Specified by:
      update in interface Checksum
      Parameters:
      buffer - the ByteBuffer to update the checksum with

    • reset

      public void reset()
      Resets CRC-32C to initial value.
      Specified by:
      reset in interface Checksum

    • getValue

      public long getValue()
      Returns CRC-32C value.
      Specified by:
      getValue in interface Checksum
      Returns:
      the current checksum value