Example usage for java.util.zip Checksum update

Introduction

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

Prototype

public void update(byte[] b, int off, int len);

Source Link

Document

Updates the current checksum with the specified array of bytes.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    byte[] bytes = "some data".getBytes();

    Checksum checksumEngine = new Adler32();
    checksumEngine.update(bytes, 0, bytes.length);
    long checksum = checksumEngine.getValue();
    System.out.println(checksum);
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    byte[] bytes = "some data".getBytes();

    // Compute Adler-32 checksum
    Checksum checksumEngine = new CRC32();
    checksumEngine.update(bytes, 0, bytes.length);
    long checksum = checksumEngine.getValue();

    checksumEngine.reset();/*from   w  w  w. ja v a 2  s.  co m*/
}

From source file:Main.java

public static long doChecksum(String text) throws UnsupportedEncodingException {
    byte bytes[] = text.getBytes("UTF-8"); // This makes this hash function platform independent
    Checksum checksum = new CRC32();
    checksum.update(bytes, 0, bytes.length);
    long lngChecksum = checksum.getValue();
    return lngChecksum;
}

From source file:ChecksumCalculator.java

public static long compute(byte[] data, int start, int length) {
    Checksum checksum = new Adler32();
    checksum.update(data, start, length);
    return checksum.getValue();
}

From source file:net.sourceforge.jaulp.file.checksum.ChecksumUtils.java

/**
 * Gets the checksum from the given byte array with an instance of.
 *
 * @param bytes/* w w  w  .  ja va 2s . 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(byte[] bytes) {
    Checksum checksum = new CRC32();
    checksum.update(bytes, 0, bytes.length);
    long cs = checksum.getValue();
    return cs;
}

From source file:net.sourceforge.jaulp.file.checksum.ChecksumUtils.java

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

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.//  ww w.  j a  v  a 2s.  co m
 */
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:com.nridge.core.base.std.FilUtl.java

/**
 * Generates a unique path and file name combination based on the parameters
 * provided./*from w w  w .jav a2s . 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);
}

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 . co  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;
}

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 av  a2  s  .co 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;
}