Example usage for java.util.zip Adler32 Adler32

Introduction

In this page you can find the example usage for java.util.zip Adler32 Adler32.

Prototype

public Adler32() 

Source Link

Document

Creates a new Adler32 object.

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);
}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    CheckedInputStream cis = new CheckedInputStream(new FileInputStream("filename"), new Adler32());
    byte[] tempBuf = new byte[128];
    while (cis.read(tempBuf) >= 0) {
    }/* w  w  w.  ja  v a  2  s . c  o  m*/
    long checksum = cis.getChecksum().getValue();
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    CheckedOutputStream checksum = new CheckedOutputStream(new FileOutputStream("data.zip"), new Adler32());
    ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(checksum));

    int size = 0;
    byte[] buffer = new byte[1024];

    File dir = new File(".");
    String[] files = dir.list();/* w w  w  .jav a 2s.  co m*/

    for (int i = 0; i < files.length; i++) {
        System.out.println("Compressing: " + files[i]);
        FileInputStream fis = new FileInputStream(files[i]);
        ZipEntry zipEntry = new ZipEntry(files[i]);
        zos.putNextEntry(zipEntry);

        while ((size = fis.read(buffer, 0, buffer.length)) > 0) {
            zos.write(buffer, 0, size);
        }
        zos.closeEntry();
        fis.close();
    }
    zos.close();
    System.out.println("Checksum   : " + checksum.getChecksum().getValue());
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    String zipname = "d.zip";
    CheckedInputStream checksum = new CheckedInputStream(new FileInputStream(zipname), new Adler32());
    ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));
    ZipEntry entry;/*from   w  ww .j  a v a  2s. c o  m*/

    while ((entry = zis.getNextEntry()) != null) {
        System.out.println("Unzipping: " + entry.getName());
        int size;
        byte[] buffer = new byte[2048];

        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(entry.getName()),
                buffer.length);
        while ((size = zis.read(buffer, 0, buffer.length)) != -1) {
            bos.write(buffer, 0, size);
        }
        bos.flush();
        bos.close();
    }

    zis.close();
    System.out.println("Checksum = " + checksum.getChecksum().getValue());
}

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From source file:Main.java

public static void main(String[] args) throws IOException {
    FileOutputStream f = new FileOutputStream("test.zip");
    CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());
    ZipOutputStream zos = new ZipOutputStream(csum);
    BufferedOutputStream out = new BufferedOutputStream(zos);
    zos.setComment("A test of Java Zipping");

    for (int i = 0; i < args.length; i++) {
        System.out.println("Writing file " + args[i]);
        BufferedReader in = new BufferedReader(new FileReader(args[i]));
        zos.putNextEntry(new ZipEntry(args[i]));
        int c;//from   w w w . j  a  v  a  2 s .c om
        while ((c = in.read()) != -1)
            out.write(c);
        in.close();
    }
    out.close();

    System.out.println("Checksum: " + csum.getChecksum().getValue());

    System.out.println("Reading file");
    FileInputStream fi = new FileInputStream("test.zip");
    CheckedInputStream csumi = new CheckedInputStream(fi, new Adler32());
    ZipInputStream in2 = new ZipInputStream(csumi);
    BufferedInputStream bis = new BufferedInputStream(in2);
    ZipEntry ze;
    while ((ze = in2.getNextEntry()) != null) {
        System.out.println("Reading file " + ze);
        int x;
        while ((x = bis.read()) != -1)
            System.out.write(x);
    }
    System.out.println("Checksum: " + csumi.getChecksum().getValue());
    bis.close();

}

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From source file:ZipCompress.java

public static void main(String[] args) throws IOException {
    FileOutputStream f = new FileOutputStream("test.zip");
    CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());
    ZipOutputStream zos = new ZipOutputStream(csum);
    BufferedOutputStream out = new BufferedOutputStream(zos);
    zos.setComment("A test of Java Zipping");
    // No corresponding getComment(), though.
    for (int i = 0; i < args.length; i++) {
        System.out.println("Writing file " + args[i]);
        BufferedReader in = new BufferedReader(new FileReader(args[i]));
        zos.putNextEntry(new ZipEntry(args[i]));
        int c;//from w ww.jav  a 2 s .  c om
        while ((c = in.read()) != -1)
            out.write(c);
        in.close();
    }
    out.close();
    // Checksum valid only after the file has been closed!
    System.out.println("Checksum: " + csum.getChecksum().getValue());
    // Now extract the files:
    System.out.println("Reading file");
    FileInputStream fi = new FileInputStream("test.zip");
    CheckedInputStream csumi = new CheckedInputStream(fi, new Adler32());
    ZipInputStream in2 = new ZipInputStream(csumi);
    BufferedInputStream bis = new BufferedInputStream(in2);
    ZipEntry ze;
    while ((ze = in2.getNextEntry()) != null) {
        System.out.println("Reading file " + ze);
        int x;
        while ((x = bis.read()) != -1)
            System.out.write(x);
    }
    System.out.println("Checksum: " + csumi.getChecksum().getValue());
    bis.close();
    // Alternative way to open and read zip files:
    ZipFile zf = new ZipFile("test.zip");
    Enumeration e = zf.entries();
    while (e.hasMoreElements()) {
        ZipEntry ze2 = (ZipEntry) e.nextElement();
        System.out.println("File: " + ze2);
        // ... and extract the data as before
    }
}

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From source file:Main.java

public static void compressDir(File file) throws IOException {
    FileOutputStream f = new FileOutputStream(file.getParent() + file.getName() + ".zip");
    CheckedOutputStream cs = new CheckedOutputStream(f, new Adler32());
    ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(cs));

    compressDir(file, out, file.getAbsolutePath());

    out.flush();/*from  w  w  w .  ja  v a  2 s . co  m*/
    out.close();
}

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From source file:Main.java

public static boolean compress(File file) {
    try {/*  w  ww  .  j a v a 2s .  c om*/
        String fileName = file.getName();
        if (fileName.indexOf(".") != -1)
            fileName = fileName.substring(0, fileName.indexOf("."));
        FileOutputStream f = new FileOutputStream(file.getParent() + "/" + fileName + ".zip");
        CheckedOutputStream cs = new CheckedOutputStream(f, new Adler32());
        ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(cs));
        InputStream in = new FileInputStream(file);
        out.putNextEntry(new ZipEntry(file.getName()));
        int len = -1;
        byte buf[] = new byte[1024];
        while ((len = in.read(buf, 0, 1024)) != -1)
            out.write(buf, 0, len);
        out.closeEntry();

        in.close();
        out.close();
        return true;
    } catch (Exception e) {
        return false;
    }
}

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From source file:net.sourceforge.pmd.cache.AnalysisResult.java

private static long computeFileChecksum(final File sourceFile) {
    try (CheckedInputStream stream = new CheckedInputStream(
            new BufferedInputStream(Files.newInputStream(sourceFile.toPath())), new Adler32());) {
        // Just read it, the CheckedInputStream will update the checksum on it's own
        IOUtils.skipFully(stream, sourceFile.length());

        return stream.getChecksum().getValue();
    } catch (final IOException ignored) {
        // We don't really care, if it's unreadable
        // the analysis will fail and report the error on it's own since the checksum won't match
    }//w ww  . j  a  v a  2  s .  c om

    return 0;
}

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From source file:org.talend.commons.runtime.utils.io.IOUtils.java

public static long computeCRC(InputStream in) {
    long unitCRC = 0;

    BufferedInputStream bufferedInputStream = null;

    try {//from  w w  w.j  a va 2  s  .  co  m
        bufferedInputStream = new BufferedInputStream(in);

        // Compute Adler-32 checksum
        CheckedInputStream cis = new CheckedInputStream(bufferedInputStream, new Adler32());
        byte[] tempBuf = new byte[128];
        while (cis.read(tempBuf) >= 0) {
            // do nothing
        }
        unitCRC = cis.getChecksum().getValue();
    } catch (IOException e) {
        return -1;
    } finally {
        try {
            bufferedInputStream.close();
        } catch (Exception e) {
            // ignore me even if i'm null
        }
    }
    return unitCRC;
}

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