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:com.rom.jmultipatcher.Utils.java

public static long getCRC32(final String filepath, final int bytesBeforeEnd) throws IOException {
    final CRC32 sum_control = new CRC32();
    final byte[] fileAsByteArray = FileUtils.readFileToByteArray(new File(filepath));
    final byte[] copyOfRange = Arrays.copyOfRange(fileAsByteArray, 0, fileAsByteArray.length - bytesBeforeEnd);
    sum_control.update(copyOfRange);/*  w w  w .jav a 2  s  .c o m*/
    return sum_control.getValue();
}

From source file:org.openmrs.module.sync.server.ConnectionRequest.java

/**
 * Public constructor that creates a quest
 * //w  ww.jav  a  2  s .  c om
 * @param content
 * @param useCompression
 * @throws SyncException
 */
public ConnectionRequest(String content, boolean useCompression) throws SyncException {
    try {
        this.useCompression = useCompression;
        this.baos = new ByteArrayOutputStream();
        this.cos = new CheckedOutputStream(baos, new CRC32());

        if (useCompression) {
            this.zos = new GZIPOutputStream(new BufferedOutputStream(cos));
            IOUtils.copy(new ByteArrayInputStream(content.getBytes("UTF-8")), zos);
            IOUtils.closeQuietly(zos);
        } else {
            IOUtils.copy(new ByteArrayInputStream(content.getBytes("UTF-8")), baos);
            IOUtils.closeQuietly(baos);
        }
        this.checksum = cos.getChecksum().getValue();

    } catch (IOException e) {
        throw new SyncException(e);
    }
}

From source file:io.blobkeeper.file.util.FileUtils.java

public static long getCrc(byte[] data) {
    CRC32 crc = new CRC32();
    crc.update(data);
    return crc.getValue();
}

From source file:com.aimluck.eip.util.ALCellularUtils.java

/**
 * ?? ID ??? URL ??????//from   w w w . j  a  v a2 s .com
 * 
 * @param username
 * @return
 */
public static String getCheckValueForCellLogin(String username, String userid) {
    if (username == null || username.length() == 0 || userid == null) {
        return "";
    }

    String marge = username + userid;
    CRC32 crc32 = new CRC32();
    crc32.update(marge.getBytes());
    long value = crc32.getValue();
    String base64value = null;
    try {
        base64value = new String(Base64.encodeBase64(String.valueOf(value).getBytes()));
    } catch (Exception e) {
    }

    return (base64value == null) ? "" : base64value.toLowerCase();
}

From source file:io.blobkeeper.file.util.FileUtils.java

public static long getCrc(@NotNull File file) {
    CRC32 crc = new CRC32();

    while (true) {
        ByteBuffer buffer = ByteBuffer.allocate(CHUNK_SIZE);
        while (buffer.hasRemaining()) {
            int bytes = 0;
            try {
                bytes = file.getFileChannel().read(buffer);
            } catch (IOException e) {
                log.error("Can't read blob file " + file, e);
                throw new IllegalArgumentException(e);
            }//from   w w w . ja  v a 2 s  . com
            if (bytes < 0) {
                break;
            }
        }
        buffer.flip();
        if (buffer.remaining() == 0) {
            break;
        } else {
            crc.update(buffer.array());
        }
    }

    return crc.getValue();
}

From source file:org.alfresco.repo.domain.node.ChildAssocEntity.java

/**
 * Find a CRC value for the full QName using UTF-8 conversion.
 * //  w  w  w  .  j  a  v  a 2  s . c o m
 * @param qname                 the association qname
 * @return                      Returns the CRC value (UTF-8 compatible)
 */
public static Long getQNameCrc(QName qname) {
    CRC32 crc = new CRC32();
    try {
        crc.update(qname.getNamespaceURI().getBytes("UTF-8"));
        crc.update(qname.getLocalName().getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException("UTF-8 encoding is not supported");
    }
    return crc.getValue();

}

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

/**
 * Generates a unique path based on the parameters provided.
 *
 * @param aPathName Optional path name - if not provided, then the current working directory will be used.
 * @param aPrefix Path name prefix (appended with random id)
 *
 * @return A unique path name./*from  w  ww  .j  a v a  2  s  .com*/
 */
static public String generateUniquePathName(String aPathName, String aPrefix) {
    if (StringUtils.isEmpty(aPathName))
        aPathName = getWorkingDirectory();
    if (StringUtils.isEmpty(aPathName))
        aPrefix = "subpath";

    // 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();

    return String.format("%s%c%s_%d", aPathName, File.separatorChar, aPrefix, longValue);
}

From source file:net.sf.jabref.exporter.OpenDocumentSpreadsheetCreator.java

private static void storeOpenDocumentSpreadsheetFile(File file, InputStream source) throws Exception {

    try (ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(file)))) {

        //addResourceFile("mimetype", "/resource/ods/mimetype", out);
        ZipEntry ze = new ZipEntry("mimetype");
        String mime = "application/vnd.oasis.opendocument.spreadsheet";
        ze.setMethod(ZipEntry.STORED);
        ze.setSize(mime.length());//from ww  w .jav a  2s . c om
        CRC32 crc = new CRC32();
        crc.update(mime.getBytes());
        ze.setCrc(crc.getValue());
        out.putNextEntry(ze);
        for (int i = 0; i < mime.length(); i++) {
            out.write(mime.charAt(i));
        }
        out.closeEntry();

        ZipEntry zipEntry = new ZipEntry("content.xml");
        //zipEntry.setMethod(ZipEntry.DEFLATED);
        out.putNextEntry(zipEntry);
        int c;
        while ((c = source.read()) >= 0) {
            out.write(c);
        }
        out.closeEntry();

        // Add manifest (required for OOo 2.0) and "meta.xml": These are in the
        // resource/ods directory, and are copied verbatim into the zip file.
        OpenDocumentSpreadsheetCreator.addResourceFile("meta.xml", "/resource/ods/meta.xml", out);

        OpenDocumentSpreadsheetCreator.addResourceFile("META-INF/manifest.xml", "/resource/ods/manifest.xml",
                out);
    }
}

From source file:org.danilopianini.io.FileUtilities.java

/**
 * Computes the CRC32 sum for a given file.
 * //from  w  ww  .  j  ava 2s  . c o m
 * @param f
 *            the file
 * @return the CRC32
 * @throws IOException
 *             if an I/O error occurs
 */
public static long fileCRC32sum(final File f) throws IOException {
    try (final InputStream is = new FileInputStream(f)) {
        final CRC32 crc = new CRC32();
        int val;
        do {
            val = is.read();
            crc.update(val);
        } while (val != -1);
        is.close();
        return crc.getValue();
    }
}

From source file:org.kuali.rice.krad.datadictionary.URLMonitor.java

private Long getCRC(URL zipUrl) {
    Long result = -1l;/*from   w w  w  .  j a  v  a2  s  . co  m*/
    try {
        CRC32 crc = new CRC32();
        CheckedInputStream cis = new CheckedInputStream(zipUrl.openStream(), crc);

        byte[] buffer = new byte[1024];
        int length;

        //read the entry from zip file and extract it to disk
        while ((length = cis.read(buffer)) > 0)
            ;

        cis.close();

        result = crc.getValue();
    } catch (IOException e) {
        LOG.warn("Unable to calculate CRC, resource doesn't exist?", e);
    }
    return result;
}