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: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();// ww w.j  av  a  2s . co  m
}

From source file:Main.java

public static void main(String[] args) throws IOException {
    FileInputStream fin = new FileInputStream("a.zip");
    Checksum cs = new CRC32();
    for (int b = fin.read(); b != -1; b = fin.read()) {
        cs.update(b);/*from   w w  w  .  j a v a2  s .  c o  m*/
    }
    System.out.println(cs.getValue());
    fin.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    BufferedInputStream is = new BufferedInputStream(new FileInputStream("a.exe"));
    byte[] bytes = new byte[1024];
    int len = 0;//from ww w . j av a 2 s. c o  m

    while ((len = is.read(bytes)) >= 0) {
        new CRC32().update(bytes, 0, len);
    }
    is.close();
    System.out.println(Arrays.toString(bytes));

}

From source file:Main.java

public static long getStringCRC(String localData) {
    if (localData == null)
        return 0;
    CRC32 crc = new CRC32();
    crc.update(localData.getBytes());/*from   w  w w  . ja v  a  2 s .com*/
    return crc.getValue();
}

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:Main.java

public static long getCRC32(InputStream in) throws IOException {
    Checksum cs = new CRC32();

    for (int b = in.read(); b != -1; b = in.read()) {
        cs.update(b);/*from   www.  j  av a 2s.c  o m*/
    }
    return cs.getValue();
}

From source file:MainClass.java

public static long getCRC32(InputStream in) throws IOException {

    Checksum cs = new CRC32();

    // more efficient to read chunks of data at a time
    for (int b = in.read(); b != -1; b = in.read()) {
        cs.update(b);/* w  w  w  . j a v  a 2s .c o  m*/
    }
    return cs.getValue();
}

From source file:Main.java

public static String getCRC32(File file) {
    CRC32 crc32 = new CRC32();
    CheckedInputStream checkedinputstream = null;
    String crc = null;/* w  w  w . j a  v a  2s.co m*/
    try {
        checkedinputstream = new CheckedInputStream(new FileInputStream(file), crc32);
        byte[] buf = new byte[1024];
        while (checkedinputstream.read(buf) >= 0) {
        }
        crc = Long.toHexString(crc32.getValue()).toUpperCase();
    } catch (Exception e) {
        Log.w(TAG, e);
        Log.e("WxException", e.getMessage(), e);
    } finally {
        if (checkedinputstream != null) {
            try {
                checkedinputstream.close();
            } catch (IOException e) {
            }
        }
    }
    return crc;
}

From source file:com.esri.geoportal.harvester.api.base.SimpleScrambler.java

/**
 * Encodes string.//from  ww  w. j  a  v a2 s  . c o  m
 * @param txt string to encode
 * @return encoded string or <code>null</code> if error encoding string
 */
public static String encode(String txt) {
    txt = StringUtils.defaultIfEmpty(txt, "");
    try {
        CRC32 crC32 = new CRC32();
        crC32.update(txt.getBytes("UTF-8"));
        long crc = crC32.getValue();
        String crctxt = String.format("%10d%s", crc, txt);
        Base64.Encoder encoder = Base64.getEncoder();
        return encoder.encodeToString(crctxt.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException ex) {
        return null;
    }
}

From source file:CRC32HashBuilder.java

/**
 * {@inheritDoc}/*  w  w  w.  j a va2  s  .  c  o m*/
 */
public String getHash(final InputStream input) throws IOException {
    if (input == null) {
        throw new IllegalArgumentException("Content cannot be null!");
    }
    final Checksum checksum = new CRC32();
    final byte[] bytes = new byte[1024];
    int len = 0;
    while ((len = input.read(bytes)) >= 0) {
        checksum.update(bytes, 0, len);
    }

    final String hash = new BigInteger(Long.toString(checksum.getValue())).toString(16);
    return hash;
}