Example usage for java.util.zip CRC32 CRC32

Introduction

In this page you can find the example usage for java.util.zip CRC32 CRC32.

Prototype

public CRC32() 

Source Link

Document

Creates a new CRC32 object.

Usage

From source file:eionet.webq.service.RemoteFileServiceImpl.java

/**
 * Calculates crc32 checksum./* ww  w. jav a  2 s  .  c o  m*/
 *
 * @param bytes bytes to calculate checksum.
 * @return checksum
 * @see java.util.zip.CRC32
 */
private long crc32Checksum(byte[] bytes) {
    CRC32 crc32 = new CRC32();
    crc32.update(bytes);
    return crc32.getValue();
}

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From source file:com.littcore.io.util.ZipUtils.java

/**
 * ?/*from  ww  w  . jav  a2s .  co m*/
 * @param files 
 * @param targetFileNamePath 
 * @throws IOException
 */
public static void batchZip(File[] files, String targetFileNamePath) throws IOException {
    //?
    CheckedOutputStream cs = new CheckedOutputStream(new FileOutputStream(targetFileNamePath), new CRC32());
    //zip?
    ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(cs));
    File srcFile = null;
    for (int i = 0; i < files.length; i++) {
        srcFile = files[i];
        out.putNextEntry(new ZipEntry(srcFile.getName()));
        FileInputStream in = new FileInputStream(srcFile);
        int len;
        byte[] buf = new byte[BUFFERED_SIZE];
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        out.closeEntry();
        in.close();
    }
    out.close();
}

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From source file:com.haulmont.cuba.core.sys.logging.LogArchiver.java

private static ArchiveEntry newTailArchive(String name, byte[] tail) {
    ZipArchiveEntry zipEntry = new ZipArchiveEntry(name);
    zipEntry.setSize(tail.length);// w w  w.ja  va 2  s.co  m
    zipEntry.setCompressedSize(zipEntry.getSize());
    CRC32 crc32 = new CRC32();
    crc32.update(tail);
    zipEntry.setCrc(crc32.getValue());
    return zipEntry;
}

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From source file:org.anarres.lzo.LzopOutputStream.java

/**
 * Constructs a new LzopOutputStream./*  www  . j  a v a  2  s  . c om*/
 *
 * I recommend limiting flags to the following unless you REALLY know what
 * you are doing:
 * <ul>
 * <li>{@link LzopConstants#F_ADLER32_C}</li>
 * <li>{@link LzopConstants#F_ADLER32_D}</li>
 * <li>{@link LzopConstants#F_CRC32_C}</li>
 * <li>{@link LzopConstants#F_CRC32_D}</li>
 * </ul>
 */
public LzopOutputStream(OutputStream out, LzoCompressor compressor, int inputBufferSize, long flags)
        throws IOException {
    super(out, compressor, inputBufferSize);
    this.flags = flags;
    this.c_crc32_c = ((flags & LzopConstants.F_CRC32_C) == 0) ? null : new CRC32();
    this.c_crc32_d = ((flags & LzopConstants.F_CRC32_D) == 0) ? null : new CRC32();
    this.c_adler32_c = ((flags & LzopConstants.F_ADLER32_C) == 0) ? null : new Adler32();
    this.c_adler32_d = ((flags & LzopConstants.F_ADLER32_D) == 0) ? null : new Adler32();
    writeLzopHeader();
}

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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./*  w ww  .ja v  a 2s  .c  om*/
 *
 * @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.blockwithme.longdb.tools.Utils.java

/** Get checksum CRC32 for the file content.
 * /*from w  w  w  .ja  va 2 s.co m*/
 * @param theFile
 *        the file
 * @param isCommpressed
 *        true if commpressed
 * @return the checksum (CRC32) of the file.
 * @throws Exception */
@SuppressWarnings("resource")
public static long getCRC32(final File theFile, final boolean isCommpressed) throws Exception {
    CheckedInputStream cis = null;
    try {
        final CRC32 checksum = new CRC32();
        // TODO: Would a buffered input stream make this faster?
        cis = new CheckedInputStream((isCommpressed ? new GZIPInputStream(new FileInputStream(theFile))
                : new FileInputStream(theFile)), checksum);
        final byte[] tempBuf = new byte[ONE_K];
        while (cis.read(tempBuf) >= 0)
            ; // just read the full stream. // $codepro.audit.disable
        return checksum.getValue();
    } finally {
        if (cis != null)
            cis.close();
    }
}

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From source file:com.indeed.lsmtree.recordlog.BasicRecordFile.java

private Option<E> readAndCheck(long address, MutableLong nextElementStart) throws IOException {
    if (address + 4 > memory.length()) {
        throw new ConsistencyException("not enough bytes in file");
    }/*from  w  ww.  j  a va2s .  com*/
    final int length = memory.getInt(address);
    if (length < 0) {
        return Option.none();
    }
    if (address + 8 > memory.length()) {
        throw new ConsistencyException("not enough bytes in file");
    }
    if (address + 8 + length > memory.length()) {
        throw new ConsistencyException("not enough bytes in file");
    }
    final int checksum = memory.getInt(address + 4);
    MemoryDataInput in = new MemoryDataInput(memory);
    in.seek(address + 8);
    CRC32 crc32 = new CRC32();
    crc32.update(CRC_SEED);
    byte[] bytes = new byte[length];
    in.readFully(bytes);
    crc32.update(bytes);
    if ((int) crc32.getValue() != checksum) {
        throw new ConsistencyException("checksum for record does not match: expected " + checksum + " actual "
                + (int) crc32.getValue());
    }
    E ret = serializer.read(ByteStreams.newDataInput(bytes));
    if (nextElementStart != null)
        nextElementStart.setValue(address + 8 + length);
    return Option.some(ret);
}

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From source file:org.alfresco.repo.domain.audit.AbstractAuditDAOImpl.java

/**
 * {@inheritDoc}//  www  .  j av a 2 s  .  com
 */
public Pair<Long, ContentData> getOrCreateAuditModel(URL url) {
    InputStream is = null;
    try {
        is = url.openStream();
        // Calculate the CRC and find an entry that matches
        CRC32 crcCalc = new CRC32();
        byte[] buffer = new byte[1024];
        int read = -1;
        do {
            read = is.read(buffer);
            if (read < 0) {
                break;
            }
            crcCalc.update(buffer, 0, read);
        } while (true);
        long crc = crcCalc.getValue();
        // Find an existing entry
        AuditModelEntity existingEntity = getAuditModelByCrc(crc);
        if (existingEntity != null) {
            Long existingEntityId = existingEntity.getId();
            // Locate the content
            ContentData existingContentData = contentDataDAO.getContentData(existingEntity.getContentDataId())
                    .getSecond();
            Pair<Long, ContentData> result = new Pair<Long, ContentData>(existingEntityId, existingContentData);
            // Done
            if (logger.isDebugEnabled()) {
                logger.debug("Found existing model with same CRC: \n" + "   URL:    " + url + "\n"
                        + "   CRC:    " + crc + "\n" + "   Result: " + result);
            }
            return result;
        } else {
            // Upload the content afresh
            is.close();
            is = url.openStream();
            ContentWriter writer = contentService.getWriter(null, null, false);
            writer.setEncoding("UTF-8");
            writer.setMimetype(MimetypeMap.MIMETYPE_XML);
            writer.putContent(is);
            ContentData newContentData = writer.getContentData();
            Long newContentDataId = contentDataDAO.createContentData(newContentData).getFirst();
            AuditModelEntity newEntity = createAuditModel(newContentDataId, crc);
            Pair<Long, ContentData> result = new Pair<Long, ContentData>(newEntity.getId(), newContentData);
            // Done
            if (logger.isDebugEnabled()) {
                logger.debug("Created new audit model: \n" + "   URL:    " + url + "\n" + "   CRC:    " + crc
                        + "\n" + "   Result: " + result);
            }
            return result;
        }
    } catch (IOException e) {
        throw new AlfrescoRuntimeException("Failed to read Audit model: " + url);
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (Throwable e) {
            }
        }
    }
}

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From source file:com.googlecode.flyway.core.migration.sql.SqlMigration.java

/**
 * Calculates the checksum of this sql script.
 *
 * @return The crc-32 checksum of the script.
 *//*from   ww w  . j av a2s  .co m*/
private int calculateChecksum(String sql) {
    final CRC32 crc32 = new CRC32();
    crc32.update(sql.getBytes());
    return (int) crc32.getValue();
}

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From source file:com.seer.datacruncher.utils.CryptoUtil.java

private boolean checkKeyVerify() {
    CRC32 crc = new CRC32();
    crc.update(cryWorm(Reserved.ENCRYPTIONKEY, Reserved.CHECK, 0).getBytes());
    return Long.toString((crc.getValue())).equals(Reserved.CHECK);
}

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