Examples of Adler32

com.sleepycat.je.utilint.Adler32
Adler32 checksum implementation. This class is used rather than the native java.util.zip.Adler32 class because we have seen a JIT problem when calling the Adler32 class using the Server JVM on Linux and Solaris. Specifically, we suspect this may be Bug Parade number 4965907. See SR [#9376]. We also believe that this bug is fixed in Java 5 and therefore only use this class conditionally if we find that we're in a 1.4 JVM. [#13354]. The Adler32 checksum is discussed in RFC1950. The sample implementation from this RFC is shown below:
```
 #define BASE 65521  largest prime smaller than 65536 unsigned long update_adler32(unsigned long adler, unsigned char *buf, int len) { unsigned long s1 = adler & 0xffff; unsigned long s2 = (adler >> 16) & 0xffff; int n; for (n = 0; n < len; n++) { s1 = (s1 + buf[n]) % BASE; s2 = (s2 + s1)     % BASE; } return (s2 << 16) + s1; } unsigned long adler32(unsigned char *buf, int len) { return update_adler32(1L, buf, len); } 
```
The NMAX optimization is so that we don't have to do modulo calculations on every iteration. NMAX is the max number of additions to make before you have to perform the modulo calculation.
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

Examples of java.util.zip.Adler32

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

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Examples of java.util.zip.Adler32

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

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Examples of java.util.zip.Adler32


    Inflater inflateDiction = new Inflater();
    inflateDiction.setInput(outPutDiction);
    if (inflateDiction.needsDictionary() == true) {
      // getting the checkSum value through the Adler32 class
      Adler32 adl = new Adler32();
      adl.update(dictionaryArray);
      long checkSumR = adl.getValue();
      assertTrue(
          "the checksum value returned by getAdler() is not the same as the checksum returned by creating the adler32 instance",
          checkSumR == inflateDiction.getAdler());
    }
  }

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Examples of java.util.zip.Adler32

    if (classPrefix == null) {
      /*
       * Note that the checksum will miss some or all of the subtypes generated
       * by other generators.
       */
      Adler32 checksum = new Adler32();
      for (JClassType type : cssResourceSubtypes) {
        checksum.update(Util.getBytes(type.getQualifiedSourceName()));
      }
      classPrefix = "G"
          + Long.toString(checksum.getValue(), Character.MAX_RADIX);
    }


    return classPrefix;
  }

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Examples of java.util.zip.Adler32


    Inflater inflateDiction = new Inflater();
    inflateDiction.setInput(outPutDiction);
    if (inflateDiction.needsDictionary() == true) {
      // getting the checkSum value through the Adler32 class
      Adler32 adl = new Adler32();
      adl.update(dictionaryArray);
      long checkSumR = adl.getValue();
      assertTrue(
          "the checksum value returned by getAdler() is not the same as the checksum returned by creating the adler32 instance",
          checkSumR == inflateDiction.getAdler());
    }
  }

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Examples of java.util.zip.Adler32

          System.out.println("EOF reached after " + count + " txns.");
        }


        return;
      }
      Checksum crc = new Adler32();
      crc.update(bytes, 0, bytes.length);
      if (crcValue != crc.getValue()) {
        throw new IOException("CRC doesn't match " + crcValue + " vs " + crc.getValue());
      }
      InputArchive iab = BinaryInputArchive.getArchive(new ByteArrayInputStream(bytes));
      TxnHeader hdr = new TxnHeader();
      Record txn = SerializeUtils.deserializeTxn(iab, hdr);
      if (bw != null) {

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Examples of java.util.zip.Adler32

public class Adler32CheckSum extends CheckSum {


    private Adler32 checkSumGenerator = null;


    public Adler32CheckSum() {
        checkSumGenerator = new Adler32();
    }

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Examples of java.util.zip.Adler32

    /** Since {@link #equals} depends on the contents of memory, use that
     * as the basis for the hash code.
     */
    public int hashCode() {
        clear(); write();
        Adler32 code = new Adler32();
        code.update(getPointer().getByteArray(0, size()));
        return (int)code.getValue();
    }

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Examples of java.util.zip.Adler32

    /** Since {@link #equals} depends on the contents of memory, use that
     * as the basis for the hash code.
     */
    public int hashCode() {
        clear(); write();
        Adler32 code = new Adler32();
        code.update(getPointer().getByteArray(0, size()));
        return (int)code.getValue();
    }

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Examples of java.util.zip.Adler32

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

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