- java.lang.Object
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- java.util.zip.CRC32
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- 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.Passing a
nullargument to a method in this class will cause aNullPointerExceptionto be thrown.- Since:
- 1.1
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Constructor Summary
Constructors Constructor Description CRC32()Creates a new CRC32 object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description longgetValue()Returns CRC-32 value.voidreset()Resets CRC-32 to initial value.voidupdate(byte[] b, int off, int len)Updates the CRC-32 checksum with the specified array of bytes.voidupdate(int b)Updates the CRC-32 checksum with the specified byte (the low eight bits of the argument b).voidupdate(ByteBuffer buffer)Updates the CRC-32 checksum with the bytes from the specified buffer.
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Method Detail
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update
public void update(int b)
Updates the CRC-32 checksum with the specified byte (the low eight bits of the argument b).
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update
public void update(byte[] b, int off, int len)Updates the CRC-32 checksum with the specified array of bytes.- Specified by:
updatein interfaceChecksum- Parameters:
b- the byte array to update the checksum withoff- the start offset of the datalen- the number of bytes to use for the update- Throws:
ArrayIndexOutOfBoundsException- ifoffis negative, orlenis negative, oroff+lenis negative or greater than the length of the arrayb.
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update
public void update(ByteBuffer buffer)
Updates the CRC-32 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.
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