CheckedInputStream

CheckedInputStream

java.util.zip

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Java 1.1

closeable

This class is a subclass of java.io.FilterInputStream ; it allows a stream to be read and a checksum computed on its contents at the same time. This is useful when you want to check the integrity of a stream of data against a published checksum value. To create a CheckedInputStream , you must specify both the stream it should read and a Checksum object, such as CRC32 , that implements the particular checksum algorithm you desire . The read( ) and skip( ) methods are the same as those of other input streams. As bytes are read, they are incorporated into the checksum that is being computed. The getChecksum( ) method does not return the checksum value itself, but rather the Checksum object. You must call the getValue( ) method of this object to obtain the checksum value.

Figure 16-135. java.util.zip.CheckedInputStream

 public class  CheckedInputStream  extends java.io.FilterInputStream {  // Public Constructors  public  CheckedInputStream  (java.io.InputStream  in  , Checksum  cksum  );  // Public Instance Methods  public Checksum  getChecksum  ( );  // Public Methods Overriding FilterInputStream  public int  read  ( ) throws java.io.IOException;        public int  read  (byte[ ]  buf  , int  off  , int  len  ) throws java.io.IOException;        public long  skip  (long  n  ) throws java.io.IOException;   }