Examples of java.util.zip.CheckedInputStream

java.util.zip.CheckedInputStream
An input stream that also maintains a checksum of the data being read. The checksum can then be used to verify the integrity of the input data. @see Checksum @version 1.22, 04/07/06 @author David Connelly

          NameNodeLayoutVersion.Feature.EDITLOG_LENGTH, logVersion)
          || logVersion < NameNodeLayoutVersion.CURRENT_LAYOUT_VERSION;


      if (this.checksum != null) {
        this.in = new DataInputStream(
            new CheckedInputStream(in, this.checksum));
      } else {
        this.in = in;
      }
      this.limiter = limiter;
      this.cache = new OpInstanceCache();

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        public ChecksumEntity(final HttpEntity wrapped, final Checksum checksum) {
            super(wrapped, new InputStreamFactory() {


                @Override
                public InputStream create(final InputStream instream) throws IOException {
                    return new CheckedInputStream(instream, checksum);
                }


            });
        }

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        File snap = null;
        boolean foundValid = false;
        for (int i = 0; i < snapList.size(); i++) {
            snap = snapList.get(i);
            InputStream snapIS = null;
            CheckedInputStream crcIn = null;
            try {
                LOG.info("Reading snapshot " + snap);
                snapIS = new BufferedInputStream(new FileInputStream(snap));
                crcIn = new CheckedInputStream(snapIS, new Adler32());
                InputArchive ia = BinaryInputArchive.getArchive(crcIn);
                deserialize(dt,sessions, ia);
                long checkSum = crcIn.getChecksum().getValue();
                long val = ia.readLong("val");
                if (val != checkSum) {
                    throw new IOException("CRC corruption in snapshot :  " + snap);
                }
                foundValid = true;
                break;
            } catch(IOException e) {
                LOG.warn("problem reading snap file " + snap, e);
            } finally {
                if (snapIS != null) 
                    snapIS.close();
                if (crcIn != null) 
                    crcIn.close();
            } 
        }
        if (!foundValid) {
            throw new IOException("Not able to find valid snapshots in " + snapDir);
        }

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    public static long getChecksum(String test) {
        try {
            byte buffer[] = test.getBytes();
            ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
            CheckedInputStream cis = new CheckedInputStream(bais, new Adler32());
            byte readBuffer[] = new byte[buffer.length];
            cis.read(readBuffer);
            return cis.getChecksum().getValue();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

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     */
    private GzipInputStreamEntry readHeader() throws IOException {
        if (eos) {
            return null;        // end of stream reached.
        }
        CheckedInputStream cis = new CheckedInputStream(in, crc);
        // Reset inflater for reading next GZip member.
        inf.reset();
        // Reset CRC to compute header CRC (CRC16).
        crc.reset();

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      final int size = partitions * MAP_OUTPUT_INDEX_RECORD_LENGTH;


      buf = ByteBuffer.allocate(size);
      if (crc != null) {
        crc.reset();
        CheckedInputStream chk = new CheckedInputStream(in, crc);
        IOUtils.readFully(chk, buf.array(), 0, size);
        if (chk.getChecksum().getValue() != in.readLong()) {
          throw new ChecksumException("Checksum error reading spill index: " +
                                indexFileName, -1);
        }
      } else {
        IOUtils.readFully(in, buf.array(), 0, size);

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      final int size = partitions * MAP_OUTPUT_INDEX_RECORD_LENGTH;


      buf = ByteBuffer.allocate(size);
      if (crc != null) {
        crc.reset();
        CheckedInputStream chk = new CheckedInputStream(in, crc);
        IOUtils.readFully(chk, buf.array(), 0, size);
        if (chk.getChecksum().getValue() != in.readLong()) {
          throw new ChecksumException("Checksum error reading spill index: " +
                                indexFileName, -1);
        }
      } else {
        IOUtils.readFully(in, buf.array(), 0, size);

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        try {
            if (file.canRead()) {
                 checksum.reset();
                 FileInputStream fis = new FileInputStream(file);
                 CheckedInputStream check = new CheckedInputStream(fis, checksum);
                 BufferedInputStream in = new BufferedInputStream(check);
                 while (in.read() != -1) {
                     // Read the file
                 }
                 rval = Long.toString(check.getChecksum().getValue());
                 in.close();
            }
        } catch (Exception e) {
            rval = null;
        }

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        if (file.isDirectory()) {
            throw new IllegalArgumentException("Checksums can't be computed on directories");
        }
        InputStream in = null;
        try {
            in = new CheckedInputStream(new FileInputStream(file), checksum);
            IOUtils.copy(in, new NullOutputStream());
        } finally {
            IOUtils.closeQuietly(in);
        }
        return checksum;

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   * @tests java.util.zip.CheckedInputStream#CheckedInputStream(java.io.InputStream,
   *        java.util.zip.Checksum)
   */
  public void test_ConstructorLjava_io_InputStreamLjava_util_zip_Checksum() throws Exception {
        InputStream checkInput = Support_Resources.getStream("hyts_checkInput.txt");
        CheckedInputStream checkIn = new CheckedInputStream(checkInput, new CRC32());
        assertEquals("constructor of checkedInputStream has failed", 0, checkIn.getChecksum()
                .getValue());
        checkInput.close();
    }

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