Example usage for java.util.zip Checksum getValue

Introduction

In this page you can find the example usage for java.util.zip Checksum getValue.

Prototype

public long getValue();

Source Link

Document

Returns the current checksum value.

Usage

From source file:de.alpharogroup.file.checksum.ChecksumExtensions.java

/**
 * Gets the checksum from the given byte array with an instance of.
 *
 * @param bytes// w  w  w. j  a  v a 2 s .c o m
 *            The byte array.
 * @return The checksum from the byte array as long. {@link java.util.zip.CRC32} object.
 */
public static long getCheckSumCRC32(final byte[] bytes) {
    final Checksum checksum = new CRC32();
    checksum.update(bytes, 0, bytes.length);
    final long cs = checksum.getValue();
    return cs;
}

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From source file:de.alpharogroup.file.checksum.ChecksumExtensions.java

/**
 * Gets the checksum from the given byte array with an instance of.
 *
 * @param bytes/*from   w w w  .j a  v  a 2s .c  o m*/
 *            The byte array.
 * @return The checksum from the byte array as long. {@link java.util.zip.Adler32} object.
 */
public static long getCheckSumAdler32(final byte[] bytes) {
    final Checksum checksum = new Adler32();
    checksum.update(bytes, 0, bytes.length);
    final long cs = checksum.getValue();
    return cs;
}

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From source file:com.nridge.core.base.std.FilUtl.java

/**
 * Generates a unique path and file name combination based on the parameters
 * provided./*from  w  w  w  . j  a v  a2  s.c o m*/
 *
 * @param aPathName Path name.
 * @param aFilePrefix File name prefix (appended with random id)
 * @param aFileExtension File name extension.
 *
 * @return A unique path and file name combination.
 */
static public String generateUniquePathFileName(String aPathName, String aFilePrefix, String aFileExtension) {
    String pathFileName;

    if (StringUtils.isNotEmpty(aPathName))
        pathFileName = String.format("%s%c%s", aPathName, File.separatorChar, aFilePrefix);
    else
        pathFileName = aFilePrefix;

    // http://www.javapractices.com/topic/TopicAction.do?Id=56

    UUID uniqueId = UUID.randomUUID();
    byte idBytes[] = uniqueId.toString().getBytes();
    Checksum checksumValue = new CRC32();
    checksumValue.update(idBytes, 0, idBytes.length);
    long longValue = checksumValue.getValue();

    if (StringUtils.startsWith(aFileExtension, "."))
        return String.format("%s_%d%s", pathFileName, longValue, aFileExtension);
    else
        return String.format("%s_%d.%s", pathFileName, longValue, aFileExtension);
}

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From source file:com.bigdata.dastor.db.commitlog.CommitLog.java

public static void recover(File[] clogs) throws IOException {
    Set<Table> tablesRecovered = new HashSet<Table>();
    List<Future<?>> futures = new ArrayList<Future<?>>();
    for (File file : clogs) {
        int bufferSize = (int) Math.min(file.length(), 32 * 1024 * 1024);
        BufferedRandomAccessFile reader = new BufferedRandomAccessFile(file.getAbsolutePath(), "r", bufferSize);

        try {//from  w ww  .  j  a va2 s  . c  om
            final CommitLogHeader clHeader;
            try {
                clHeader = CommitLogHeader.readCommitLogHeader(reader);
            } catch (EOFException eofe) {
                logger.info(
                        "Attempted to recover an incomplete CommitLogHeader.  Everything is ok, don't panic.");
                continue;
            }

            /* seek to the lowest position where any CF has non-flushed data */
            int lowPos = CommitLogHeader.getLowestPosition(clHeader);
            if (lowPos == 0)
                continue;

            reader.seek(lowPos);
            if (logger.isDebugEnabled())
                logger.debug("Replaying " + file + " starting at " + lowPos);

            /* read the logs populate RowMutation and apply */
            while (!reader.isEOF()) {
                if (logger.isDebugEnabled())
                    logger.debug("Reading mutation at " + reader.getFilePointer());

                long claimedCRC32;
                byte[] bytes;
                try {
                    bytes = new byte[(int) reader.readLong()]; // readlong can throw EOFException too
                    reader.readFully(bytes);
                    claimedCRC32 = reader.readLong();
                } catch (EOFException e) {
                    // last CL entry didn't get completely written.  that's ok.
                    break;
                }

                ByteArrayInputStream bufIn = new ByteArrayInputStream(bytes);
                Checksum checksum = new CRC32();
                checksum.update(bytes, 0, bytes.length);
                if (claimedCRC32 != checksum.getValue()) {
                    // this part of the log must not have been fsynced.  probably the rest is bad too,
                    // but just in case there is no harm in trying them.
                    continue;
                }

                /* deserialize the commit log entry */
                final RowMutation rm = RowMutation.serializer().deserialize(new DataInputStream(bufIn));
                if (logger.isDebugEnabled())
                    logger.debug(String.format("replaying mutation for %s.%s: %s", rm.getTable(), rm.key(),
                            "{" + StringUtils.join(rm.getColumnFamilies(), ", ") + "}"));
                final Table table = Table.open(rm.getTable());
                tablesRecovered.add(table);
                final Collection<ColumnFamily> columnFamilies = new ArrayList<ColumnFamily>(
                        rm.getColumnFamilies());
                final long entryLocation = reader.getFilePointer();
                Runnable runnable = new WrappedRunnable() {
                    public void runMayThrow() throws IOException {
                        /* remove column families that have already been flushed before applying the rest */
                        for (ColumnFamily columnFamily : columnFamilies) {
                            int id = table.getColumnFamilyId(columnFamily.name());
                            if (!clHeader.isDirty(id) || entryLocation <= clHeader.getPosition(id)) {
                                rm.removeColumnFamily(columnFamily);
                            }
                        }
                        if (!rm.isEmpty()) {
                            Table.open(rm.getTable()).apply(rm, null, false);
                        }
                    }
                };
                futures.add(StageManager.getStage(StageManager.MUTATION_STAGE).submit(runnable));
                if (futures.size() > MAX_OUTSTANDING_REPLAY_COUNT) {
                    FBUtilities.waitOnFutures(futures);
                    futures.clear();
                }
            }
        } finally {
            reader.close();
            logger.info("Finished reading " + file);
        }
    }

    // wait for all the writes to finish on the mutation stage
    FBUtilities.waitOnFutures(futures);
    logger.debug("Finished waiting on mutations from recovery");

    // flush replayed tables
    futures.clear();
    for (Table table : tablesRecovered)
        futures.addAll(table.flush());
    FBUtilities.waitOnFutures(futures);
}

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From source file:com.jkoolcloud.tnt4j.streams.configure.state.AbstractFileStreamStateHandler.java

/**
 * Check the line CRC.//w w  w . j a  v  a 2  s  .  c o  m
 *
 * @param line
 *            line to check
 * @param crc
 *            CRC to match
 *
 * @return {@code true} if matched
 */
private static boolean checkCrc(String line, Long crc) {
    if (line == null || crc == null) {
        return false;
    }

    Checksum crcLine = new CRC32();
    final byte[] bytes4Line = line.getBytes();
    crcLine.update(bytes4Line, 0, bytes4Line.length);
    final long lineCRC = crcLine.getValue();
    return lineCRC == crc;
}

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From source file:com.autoupdateapk.AutoUpdateApk.java

private static int crc32(String str) {
    byte bytes[] = str.getBytes();
    Checksum checksum = new CRC32();
    checksum.update(bytes, 0, bytes.length);
    return (int) checksum.getValue();
}

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From source file:com.jkoolcloud.tnt4j.streams.configure.state.AbstractFileStreamStateHandler.java

/**
 * Calculates CRC value for bytes read from provided input stream.
 *
 * @param in//from   ww w . j  ava  2  s.co m
 *            reader to read bytes for CRC calculation
 *
 * @return calculated CRC value
 *
 * @throws IOException
 *             if input can't be read.
 */
protected static Long getInputCrc(Reader in) throws IOException {
    char[] buff = new char[BYTES_TO_COUNT_CRC];
    Checksum crc = new CRC32();
    int readLen = in.read(buff);

    if (readLen > 0) {
        String str = new String(buff, 0, readLen);
        final byte[] bytes = str.getBytes(Utils.UTF8);
        crc.update(bytes, 0, bytes.length);
    }

    return crc.getValue();
}

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From source file:MultiFileChecksumHelper.java

public static long getChecksum(File[] files) {
    CheckedInputStream cis = null;
    FileInputStream is = null;//w  w w . j av a 2 s .  c om
    Checksum checksum = new Adler32();
    byte[] tempBuf = new byte[128];

    for (int i = 0; i < files.length && files[i] != null && files[i].exists() && files[i].isFile(); i++) {
        try {
            is = new FileInputStream(files[i]);
            cis = new CheckedInputStream(is, checksum);
            while (cis.read(tempBuf) >= 0) {
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (cis != null) {
                try {
                    cis.close();
                } catch (IOException ioe) {
                }
                cis = null;
            }
            if (is != null) {
                try {
                    is.close();
                } catch (IOException ioe) {
                }
                is = null;
            }
        }
    }
    return checksum.getValue();
}

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From source file:de.berlin.magun.nfcmime.core.CrcGenerator.java

/**
 * Generates a CRC32 checksum for an array of NdefRecords.
 * @param records//  www. jav  a  2  s .co m
 * @return CRC32 checksum represented as long.
 */
public long getChecksum(NdefRecord[] records) {
    byte[] overallBytes = getByteArray(records);
    Checksum cs = new CRC32();
    cs.update(overallBytes, 0, overallBytes.length);
    return cs.getValue();
}

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From source file:org.codice.ddf.checksum.impl.CRC32ChecksumProvider.java

@Override
public String calculateChecksum(InputStream inputStream) throws IOException {

    if (inputStream == null) {
        throw new IllegalArgumentException("InputStream cannot be null");
    }//w w w.  j  av  a2  s. c  om

    byte[] bytes = IOUtils.toByteArray(inputStream);
    Checksum checksum = new CRC32();
    checksum.update(bytes, 0, bytes.length);
    long checkSumValue = checksum.getValue();

    return Long.toHexString(checkSumValue);
}

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