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 void doZip(String filename, String zipfilename) throws Exception {
    byte[] buf = new byte[1024];
    FileInputStream fis = new FileInputStream(filename);
    fis.read(buf, 0, buf.length);/*w  w w  . j  av a 2 s . co  m*/

    CRC32 crc = new CRC32();
    ZipOutputStream s = new ZipOutputStream((OutputStream) new FileOutputStream(zipfilename));
    s.setLevel(6);

    ZipEntry entry = new ZipEntry(filename);
    entry.setSize((long) buf.length);
    crc.reset();
    crc.update(buf);
    entry.setCrc(crc.getValue());
    s.putNextEntry(entry);
    s.write(buf, 0, buf.length);
    s.finish();
    s.close();
}

From source file:FileUtils.java

/**
 * Utility method for copying file/*from ww  w . j av  a  2  s .co  m*/
 * @param srcFile - source file
 * @param destFile - destination file
 */
public static void copyFile(File srcFile, File destFile) throws IOException {
    if (!srcFile.getPath().toLowerCase().endsWith(JPG) && !srcFile.getPath().toLowerCase().endsWith(JPEG)) {
        return;
    }
    final InputStream in = new FileInputStream(srcFile);
    final OutputStream out = new FileOutputStream(destFile);
    try {
        long millis = System.currentTimeMillis();
        CRC32 checksum;
        if (VERIFY) {
            checksum = new CRC32();
            checksum.reset();
        }
        final byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead = in.read(buffer);
        while (bytesRead >= 0) {
            if (VERIFY) {
                checksum.update(buffer, 0, bytesRead);
            }
            out.write(buffer, 0, bytesRead);
            bytesRead = in.read(buffer);
        }
        if (CLOCK) {
            millis = System.currentTimeMillis() - millis;
            System.out.println("Copy file '" + srcFile.getPath() + "' on " + millis / 1000L + " second(s)");
        }
    } catch (IOException e) {
        throw e;
    } finally {
        out.close();
        in.close();
    }
}

From source file:Main.java

public void doZip(String filename, String zipfilename) throws Exception {
    byte[] buf = new byte[1024];
    FileInputStream fis = new FileInputStream(filename);
    fis.read(buf, 0, buf.length);/*w w  w . j a  va 2 s .c  om*/

    CRC32 crc = new CRC32();
    ZipOutputStream s = new ZipOutputStream((OutputStream) new FileOutputStream(zipfilename));
    s.setLevel(6);

    ZipEntry entry = new ZipEntry(filename);
    entry.setSize((long) buf.length);
    entry.setMethod(ZipEntry.DEFLATED);
    crc.reset();
    crc.update(buf);
    entry.setCrc(crc.getValue());
    s.putNextEntry(entry);
    s.write(buf, 0, buf.length);
    s.finish();
    s.close();
}

From source file:Main.java

public void doZip(String filename, String zipfilename) throws Exception {
    byte[] buf = new byte[1024];
    FileInputStream fis = new FileInputStream(filename);
    fis.read(buf, 0, buf.length);//from  w  ww . j ava 2 s.co m

    CRC32 crc = new CRC32();
    ZipOutputStream s = new ZipOutputStream((OutputStream) new FileOutputStream(zipfilename));
    s.setLevel(6);

    ZipEntry entry = new ZipEntry(filename);
    entry.setSize((long) buf.length);
    entry.setTime(new Date().getTime());
    crc.reset();
    crc.update(buf);
    entry.setCrc(crc.getValue());
    s.putNextEntry(entry);
    s.write(buf, 0, buf.length);
    s.finish();
    s.close();
}

From source file:com.smash.revolance.ui.model.helper.ArchiveHelper.java

public static File buildArchive(File archive, File... files) throws FileNotFoundException {
    FileOutputStream fos = new FileOutputStream(archive);
    ZipOutputStream zos = new ZipOutputStream(fos);
    int bytesRead;
    byte[] buffer = new byte[1024];
    CRC32 crc = new CRC32();

    for (File file : files) {
        if (!file.exists()) {
            System.err.println("Skipping: " + file);
            continue;
        }// w w  w.j a  v a2  s  .  co m
        BufferedInputStream bis = null;
        try {
            bis = new BufferedInputStream(new FileInputStream(file));
            crc.reset();
            while ((bytesRead = bis.read(buffer)) != -1) {
                crc.update(buffer, 0, bytesRead);
            }

            bis.close();

            // Reset to beginning of input stream
            bis = new BufferedInputStream(new FileInputStream(file));
            String entryPath = FileHelper.getRelativePath(archive.getParentFile(), file);

            ZipEntry entry = new ZipEntry(entryPath);
            entry.setMethod(ZipEntry.STORED);
            entry.setCompressedSize(file.length());
            entry.setSize(file.length());
            entry.setCrc(crc.getValue());
            zos.putNextEntry(entry);
            while ((bytesRead = bis.read(buffer)) != -1) {
                zos.write(buffer, 0, bytesRead);
            }
        } catch (FileNotFoundException e) {

        } catch (IOException e) {
            e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        } finally {
            IOUtils.closeQuietly(bis);
        }
    }
    IOUtils.closeQuietly(zos);
    return archive;
}

From source file:kr.ac.cau.mecs.cass.signal.payload.JSONObjectPayload.java

@Override
public void serializeRawData(Payload payload) {
    String data = this.data.toString();

    Checksum crc32 = new CRC32();
    Base64 base64 = new Base64();

    byte[] bytedata = data.getBytes(Charset.forName("UTF-8"));

    crc32.reset();/*from   w  w w  .ja v  a2 s  .  c  o  m*/
    crc32.update(bytedata, 0, bytedata.length);

    String encoded = base64.encode(bytedata);

    payload.setCrc(crc32.getValue());
    payload.setLength(encoded.length());
    payload.setRawdata(encoded);

    payload.setType(0x11);
}

From source file:org.apache.tika.server.writer.ZipWriter.java

private static void zipStoreBuffer(ZipArchiveOutputStream zip, String name, byte[] dataBuffer)
        throws IOException {
    ZipEntry zipEntry = new ZipEntry(name != null ? name : UUID.randomUUID().toString());
    zipEntry.setMethod(ZipOutputStream.STORED);

    zipEntry.setSize(dataBuffer.length);
    CRC32 crc32 = new CRC32();
    crc32.update(dataBuffer);/*w ww  .ja va 2 s .  com*/
    zipEntry.setCrc(crc32.getValue());

    try {
        zip.putArchiveEntry(new ZipArchiveEntry(zipEntry));
    } catch (ZipException ex) {
        if (name != null) {
            zipStoreBuffer(zip, "x-" + name, dataBuffer);
            return;
        }
    }

    zip.write(dataBuffer);

    zip.closeArchiveEntry();
}

From source file:ch.cyberduck.core.io.CRC32ChecksumCompute.java

@Override
public Checksum compute(final InputStream in, final TransferStatus status) throws ChecksumException {
    final CRC32 crc32 = new CRC32();
    try {//  w w w.jav a2s  .c o  m
        byte[] buffer = new byte[16384];
        int bytesRead;
        while ((bytesRead = in.read(buffer, 0, buffer.length)) != -1) {
            crc32.update(buffer, 0, bytesRead);
        }
    } catch (IOException e) {
        throw new ChecksumException(LocaleFactory.localizedString("Checksum failure", "Error"), e.getMessage(),
                e);
    } finally {
        IOUtils.closeQuietly(in);
    }
    return new Checksum(HashAlgorithm.crc32, Long.toHexString(crc32.getValue()));
}

From source file:brut.util.BrutIO.java

public static CRC32 calculateCrc(InputStream input) throws IOException {
    CRC32 crc = new CRC32();
    int bytesRead;
    byte[] buffer = new byte[8192];
    while ((bytesRead = input.read(buffer)) != -1) {
        crc.update(buffer, 0, bytesRead);
    }//  ww  w.  j  ava2 s .  c  o  m
    return crc;
}

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

/**
 * Generates a CRC32 checksum for an array of NdefRecords.
 * @param records/*from   w ww.  j a  v a2 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();
}