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

            }


            byte data[] = new byte[size];
            reader.readFully(offset+BATCH_CONTROL_RECORD_SIZE, data);


            Checksum checksum = new Adler32();
            checksum.update(data, 0, data.length);


            if( expectedChecksum!=checksum.getValue() ) {
                return -1;
            }


        }
        return size;

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Examples of java.util.zip.Adler32

                // Now we can fill in the batch control record properly. 
                buff.reset();
                buff.skip(5+Journal.BATCH_CONTROL_RECORD_MAGIC.length);
                buff.writeInt(sequence.getLength()-Journal.BATCH_CONTROL_RECORD_SIZE);
                if( journal.isChecksum() ) {
                  Checksum checksum = new Adler32();
                  checksum.update(sequence.getData(), sequence.getOffset()+Journal.BATCH_CONTROL_RECORD_SIZE, sequence.getLength()-Journal.BATCH_CONTROL_RECORD_SIZE);
                  buff.writeLong(checksum.getValue());
                }


                // Now do the 1 big write.
                file.seek(wb.offset);
                if (maxStat > 0) {

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Examples of java.util.zip.Adler32

        if (files.isEmpty())
            throw new BuildException("You must designate at least one file "
                    + "to include in the launch profile.");
        Collections.sort(files, FILENAME_SORTER);


        Checksum ck = new Adler32();
        for (File f : files)
            calcChecksum(f, ck);


        return Long.toString(Math.abs(ck.getValue()), Character.MAX_RADIX);
    }

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Examples of java.util.zip.Adler32

        for (int i = 0; i < sortedNames.length; i++) {
            sortedNames[i] = resourceNames.get(i).toLowerCase();
        }
        Arrays.sort(sortedNames);


        Adler32 cksum = new Adler32();
        try {
            DataOutputStream out = new DataOutputStream(
                    new CheckedOutputStream(NULL_OUT, cksum));


            for (String resourceName : sortedNames) {
                long lastMod = collection.getLastModified(resourceName);
                if (lastMod < 1)
                    continue;


                Long checksum = collection.getChecksum(resourceName);
                if (checksum == null)
                    continue;


                out.writeUTF(resourceName);
                out.writeLong(checksum);
            }
        } catch (IOException e) {
            // can't happen
        }


        return cksum.getValue();
    }

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Examples of java.util.zip.Adler32

                if (cksum != null)
                    return cksum;


                try {
                    // We don't have an up-to-date checksum. Calculate one.
                    Long newSum = FileUtils.computeChecksum(f, new Adler32());
                    // Save the new checksum. But don't return it yet! Start
                    // back at the top of the loop and make certain the last
                    // modified time hasn't changed since we calculated the
                    // checksum.
                    synchronized (this) {

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Examples of java.util.zip.Adler32

        public AbortableOutputStream(File dest) throws IOException {
            this(new BufferedOutputStream(new FileOutputStream(dest)));
        }


        public AbortableOutputStream(OutputStream out) {
            super(out, new Adler32());
            this.aborted = false;
        }

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Examples of java.util.zip.Adler32

        OutputStream outStream = new FileOutputStream(outFile);
        out = new CheckedOutputStream(outStream, checksum);
    }


    protected Checksum makeChecksum() {
        return new Adler32();
    }

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Examples of java.util.zip.Adler32

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


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

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Examples of java.util.zip.Adler32


  /**
   * Gets the checksum of a file
   */
  private void getFileChecksum(SolrParams solrParams, SolrQueryResponse rsp) {
    Checksum checksum = new Adler32();
    File dir = new File(core.getIndexDir());
    rsp.add(CHECKSUM, getCheckSums(solrParams.getParams(FILE), dir, checksum));
    dir = new File(core.getResourceLoader().getConfigDir());
    rsp.add(CONF_CHECKSUM, getCheckSums(solrParams.getParams(CONF_FILE_SHORT), dir, checksum));
  }

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Examples of java.util.zip.Adler32

        String cf = nameAndAlias.getName(i);
        File f = new File(confDir, cf);
        if (!f.exists() || f.isDirectory()) continue; //must not happen
        FileInfo info = confFileInfoCache.get(cf);
        if (info == null || info.lastmodified != f.lastModified() || info.size != f.length()) {
          if (checksum == null) checksum = new Adler32();
          info = new FileInfo(f.lastModified(), cf, f.length(), getCheckSum(checksum, f));
          confFileInfoCache.put(cf, info);
        }
        Map<String, Object> m = info.getAsMap();
        if (nameAndAlias.getVal(i) != null) m.put(ALIAS, nameAndAlias.getVal(i));

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