Examples of java.util.zip.Adler32

java.util.zip.Adler32
A class that can be used to compute the Adler-32 checksum of a data stream. An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed much faster. @see Checksum @version 1.29, 11/17/05 @author David Connelly

        int typeId  = header.getInt() ; 
        int len     = header.getInt() ;
        int ref     = header.getInt() ;
        int blockId = header.getInt() ;
        
        Adler32 adler = new Adler32() ;
        adler.update(header.array()) ;


        ByteBuffer bb = ByteBuffer.allocate(len) ;
        lenRead = channel.read(bb) ;
        if ( lenRead != len)
            throw new TDBTransactionException("Failed to read the journal entry: wanted "+len+" bytes, got "+lenRead) ;
        adler.update(bb.array()) ;
        bb.rewind() ;
        // checksum
        crcTrailer.clear() ;
        lenRead = channel.read(crcTrailer) ;
        if ( lenRead != SizeofCRC )
            throw new TDBTransactionException("Failed to read block checksum (got "+lenRead+" bytes, not "+SizeofCRC+").") ;
        int checksum = Bytes.getInt(crcTrailer.array()) ;
        if ( checksum != (int)adler.getValue() )
          throw new TDBTransactionException("Checksum error reading from the Journal.") ;


        JournalEntryType type = JournalEntryType.type(typeId) ;
        FileRef fileRef = FileRef.get(ref) ;

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    /** Faster than CRC32, nearly as good.
     * @see Adler32
     */
    public static long adler32(byte[] bytes)
    {
        return crc(new Adler32(), bytes) ;
    }

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            return;
        }
        if ("CRC".equals(algorithm)) {
            checksum = new CRC32();
        } else if ("ADLER".equals(algorithm)) {
            checksum = new Adler32();
        } else {
            throw new BuildException(new NoSuchAlgorithmException());
        }
    }

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        System.out.println("CRC took " + new TimeValue(System.currentTimeMillis() - start));
    }


    private static void adler(long dataSize) {
        long start = System.currentTimeMillis();
        Adler32 crc = new Adler32();
        byte[] data = new byte[BATCH_SIZE];
        long iter = dataSize / BATCH_SIZE;
        for (long i = 0; i < iter; i++) {
            crc.update(data);
        }
        crc.getValue();
        System.out.println("Adler took " + new TimeValue(System.currentTimeMillis() - start));
    }

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                    this.digest = null;
                } else {
//                    this.digest = new CRC32();
                    // adler is faster, and we compare on length as well, should be enough to check for difference
                    // between files
                    this.digest = new Adler32();
                }
            } else {
                this.digest = null;
            }
        }

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    logger = logger.branch(TreeLogger.DEBUG, "Computing CSS class replacements");


    SortedSet<JClassType> cssResourceSubtypes = computeOperableTypes(logger);


    if (classPrefix == null) {
      Adler32 checksum = new Adler32();
      for (JClassType type : cssResourceSubtypes) {
        checksum.update(Util.getBytes(type.getQualifiedSourceName()));
      }
      classPrefix = "G"
          + Long.toString(checksum.getValue(), Character.MAX_RADIX);
    }


    int count = 0;
    for (JClassType type : cssResourceSubtypes) {
      Map<JMethod, String> replacements = new IdentityHashMap<JMethod, String>();

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    /**
     * creates a checksum alogrithm to be used
     * @return the checksum used for this txnlog
     */
    protected Checksum makeChecksumAlgorithm(){
        return new Adler32();
    }

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        /**
         * create a checksum algorithm
         * @return the checksum algorithm
         */
        protected Checksum makeChecksumAlgorithm(){
            return new Adler32();
        }

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            contents = file.getContents();
        } catch (CoreException e) {
            throw new CausedIOException("Failed to calculate checksum.", e);
        }


        CheckedInputStream in = new CheckedInputStream(contents, new Adler32());
        try {
            IOUtils.copy(in, new NullOutputStream());
        } catch (IOException e) {
            throw new CausedIOException("Failed to calculate checksum.", e);
        } finally {

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      this.fileOutputStream = new FileOutputStream(file);
      this.fileChannel = this.fileOutputStream.getChannel();


      if (includeChecksum)
        checksum = new Adler32();
    }

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