Java compact1, compact2, compact3 java.util.zip Class CRC32（JDK8）

Constructor Detail

• CRC32

  public CRC32()

  Creates a new CRC32 object.

Method Detail

• update

  public void update(int b)

  Updates the CRC-32 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-32 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 greater than the length of the array b

• update

  public void update(byte[] b)

  Updates the CRC-32 checksum with the specified array of bytes.

  Parameters:

  b - the array of bytes to update the checksum with

• update

  public void update(ByteBuffer buffer)

  Updates the checksum with the bytes from the specified buffer. The checksum is updated using buffer.remaining() bytes starting at buffer.position() Upon return, the buffer's position will be updated to its limit; its limit will not have been changed.

  Parameters:

  buffer - the ByteBuffer to update the checksum with

  Since:

  1.8

• 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