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CRC32


java.util.zip

Class CRC32

  • All Implemented Interfaces:
    Checksum


    public class CRC32
    extends Object
    implements Checksum
    The CRC32 class is used to compute a CRC32 checksum from data provided as input value. See also Adler32 which is almost as good, but cheaper.
    • Constructor Summary

      Constructors
      Constructor and Description
      CRC32()
    • Method Summary

      Methods
      Modifier and Type Method and Description
      long getValue()
      Returns the CRC32 checksum for all input received.
      void reset()
      Resets the CRC32 checksum to it initial state.
      void update(byte[] buf)
      Updates this checksum with the bytes contained in buffer buf.
      void update(byte[] buf, int offset, int byteCount)
      Update this CRC32 checksum with the contents of buf, starting from offset and reading byteCount bytes of data.
      void update(int val)
      Updates this checksum with the byte value provided as integer.
    • Constructor Detail

      • CRC32

        public CRC32()
    • Method Detail

      • getValue

        public long getValue()
        Returns the CRC32 checksum for all input received.
        Specified by:
        getValue in interface Checksum
        Returns:
        The checksum for this instance.
      • reset

        public void reset()
        Resets the CRC32 checksum to it initial state.
        Specified by:
        reset in interface Checksum
      • update

        public void update(int val)
        Updates this checksum with the byte value provided as integer.
        Specified by:
        update in interface Checksum
        Parameters:
        val - represents the byte to update the checksum.
      • update

        public void update(byte[] buf)
        Updates this checksum with the bytes contained in buffer buf.
        Parameters:
        buf - the buffer holding the data to update the checksum with.
      • update

        public void update(byte[] buf,
                  int offset,
                  int byteCount)
        Update this CRC32 checksum with the contents of buf, starting from offset and reading byteCount bytes of data.
        Specified by:
        update in interface Checksum
        Parameters:
        buf - the byte array from which to read the bytes.
        offset - the initial position in buf to read the bytes from.
        byteCount - the number of bytes to read from buf.


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