Example usage for java.util.zip GZIPInputStream GZIPInputStream

Introduction

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

Prototype

public GZIPInputStream(InputStream in) throws IOException 

Source Link

Document

Creates a new input stream with a default buffer size.

Usage

From source file:Main.java

/**
 * Uncompresses a GZIP file.//  w w  w . j a v  a  2s.  c o  m
 * 
 * @param bytes
 *            The compressed bytes.
 * @return The uncompressed bytes.
 * @throws IOException
 *             if an I/O error occurs.
 */
public static byte[] gunzip(byte[] bytes) throws IOException {
    /* create the streams */
    InputStream is = new GZIPInputStream(new ByteArrayInputStream(bytes));
    try {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            /* copy data between the streams */
            byte[] buf = new byte[4096];
            int len = 0;
            while ((len = is.read(buf, 0, buf.length)) != -1) {
                os.write(buf, 0, len);
            }
        } finally {
            os.close();
        }

        /* return the uncompressed bytes */
        return os.toByteArray();
    } finally {
        is.close();
    }
}

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From source file:Main.java

/**
 * Degzips <strong>all</strong> of the datain the specified {@link ByteBuffer}.
 *
 * @param compressed The compressed buffer.
 * @return The decompressed array.//from w  w w .  j a  v  a 2s .com
 * @throws IOException If there is an error decompressing the buffer.
 */
public static byte[] degzip(ByteBuffer compressed) throws IOException {
    try (InputStream is = new GZIPInputStream(new ByteArrayInputStream(compressed.array()));
            ByteArrayOutputStream out = new ByteArrayOutputStream()) {
        byte[] buffer = new byte[1024];

        while (true) {
            int read = is.read(buffer, 0, buffer.length);
            if (read == -1) {
                break;
            }

            out.write(buffer, 0, read);
        }

        return out.toByteArray();
    }
}

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From source file:Main.java

@SuppressWarnings("unchecked")
static boolean loadSharedPreferencesFromFile(Context context, File src) {
    boolean res = false;
    ObjectInputStream input = null;
    try {//from w ww.ja va  2s .c o m
        GZIPInputStream inputGZIP = new GZIPInputStream(new FileInputStream(src));
        input = new ObjectInputStream(inputGZIP);
        Editor prefEdit = PreferenceManager.getDefaultSharedPreferences(context).edit();
        prefEdit.clear();
        Map<String, Object> entries = (Map<String, Object>) input.readObject();
        for (Entry<String, ?> entry : entries.entrySet()) {
            Object v = entry.getValue();
            String key = entry.getKey();

            if (v instanceof Boolean)
                prefEdit.putBoolean(key, ((Boolean) v).booleanValue());
            else if (v instanceof Float)
                prefEdit.putFloat(key, ((Float) v).floatValue());
            else if (v instanceof Integer)
                prefEdit.putInt(key, ((Integer) v).intValue());
            else if (v instanceof Long)
                prefEdit.putLong(key, ((Long) v).longValue());
            else if (v instanceof String)
                prefEdit.putString(key, ((String) v));
        }
        prefEdit.commit();
        res = true;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } finally {
        try {
            if (input != null) {
                input.close();
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
    return res;
}

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From source file:Main.java

public static String stringFromHttpPost(String urlStr, String body) {
    HttpURLConnection conn;/*from w  ww . j  av a2s  .c  om*/
    try {
        URL e = new URL(urlStr);
        conn = (HttpURLConnection) e.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setInstanceFollowRedirects(true);
        conn.setRequestMethod("POST");
        OutputStream os1 = conn.getOutputStream();
        DataOutputStream out1 = new DataOutputStream(os1);
        out1.write(body.getBytes("UTF-8"));
        out1.flush();
        conn.connect();
        String line;
        BufferedReader reader;
        StringBuffer sb = new StringBuffer();
        if ("gzip".equals(conn.getHeaderField("Content-Encoding"))) {
            reader = new BufferedReader(
                    new InputStreamReader(new GZIPInputStream(conn.getInputStream()), "UTF-8"));
        } else {
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
        }
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        return sb.toString();
    } catch (Exception e) {
        e.printStackTrace();
        logError(e.getMessage());
    }
    return null;
}

---

From source file:net.orpiske.tcs.utils.compression.Decompressor.java

/**
 * Decompress an array of bytes//from  www . j  a v  a  2 s .c om
 * @param bytes the array to decompress
 * @return a String object with the text
 * @throws IOException if unable to decompress it for any reason
 */
public static String decompress(final byte[] bytes) throws IOException {
    ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
    InputStream gzipInputStream = new GZIPInputStream(inputStream);

    /**
     * Ok, this should be "smarter". Will fix this, eventually ...
     */
    Reader reader = new InputStreamReader(gzipInputStream, Charset.forName("UTF-8"));

    BufferedReader bufferedReader = new BufferedReader(reader);
    StringBuilder builder = new StringBuilder();

    try {
        char[] buffer = new char[1];

        while (bufferedReader.read(buffer) > 0) {
            builder.append(buffer);
        }

        return builder.toString();
    } finally {
        IOUtils.closeQuietly(gzipInputStream);
        IOUtils.closeQuietly(inputStream);
    }
}

---

From source file:CompressTransfer.java

/**
 * ?//from w w  w.  j a va2s.c om
 *
 * @param is
 * @param os
 * @throws Exception
 */
public static void decompress(InputStream is, OutputStream os) throws Exception {

    GZIPInputStream gis = new GZIPInputStream(is);
    int count;
    byte data[] = new byte[BUFFER];
    while ((count = gis.read(data, 0, BUFFER)) != -1) {
        os.write(data, 0, count);
    }

    gis.close();
}

---

From source file:com.qwazr.utils.SerializationUtils.java

/**
 * Read an object from a file using a buffered stream and GZIP compression
 *
 * @param file the destination file/*  w ww.j  av a2  s  .  com*/
 * @param <T>  the type of the object
 * @return the deserialized object
 * @throws IOException
 */
public static <T> T deserialize(File file) throws IOException {
    FileInputStream is = new FileInputStream(file);
    BufferedInputStream bis = new BufferedInputStream(is);
    GZIPInputStream zis = new GZIPInputStream(bis);
    try {
        return SerializationUtils.deserialize(zis);
    } finally {
        IOUtils.close(zis, bis, is);
    }
}

---

From source file:Main.java

public static final byte[] uncompress(final byte[] bytes) {
    if (bytes == null) {
        throw new NullPointerException("byte[] is NULL !");
    }/* w  w  w  . j  a  v a 2s. com*/
    ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
    ByteArrayOutputStream bos = new ByteArrayOutputStream(8192);
    byte[] buffer = new byte[bytes.length];
    int length;
    try {
        GZIPInputStream gis = new GZIPInputStream(bais);
        while ((length = gis.read(buffer)) != -1) {
            bos.write(buffer, 0, length);
        }
        byte[] moreBytes = bos.toByteArray();
        bos.close();
        bais.close();
        gis.close();
        bos = null;
        bais = null;
        gis = null;
        return moreBytes;
    } catch (IOException e) {
        return null;
    }
}

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From source file:com.jivesoftware.os.jive.utils.shell.utils.Unzip.java

public static File unGzip(boolean verbose, File outputDir, String outName, File inputFile,
        boolean deleteOriginal) throws FileNotFoundException, IOException {
    String inFilePath = inputFile.getAbsolutePath();
    if (verbose) {
        System.out.println("unzipping " + inFilePath);
    }/* w  ww.j a  v  a 2s  .c  o  m*/
    GZIPInputStream gzipInputStream = new GZIPInputStream(new FileInputStream(inFilePath));

    File outFile = new File(outputDir, outName);
    outFile.getParentFile().mkdirs();
    String outFilePath = outFile.getAbsolutePath();
    OutputStream out = new FileOutputStream(outFilePath);

    byte[] buf = new byte[1024];
    int len;
    while ((len = gzipInputStream.read(buf)) > 0) {
        out.write(buf, 0, len);
    }

    gzipInputStream.close();
    out.close();

    if (deleteOriginal) {
        FileUtils.forceDelete(inputFile);
        if (verbose) {
            System.out.println(String.format("deleted original file %s.", inputFile.getAbsolutePath()));
        }
    }
    if (verbose) {
        System.out.println("unzipped " + inFilePath);
    }
    return new File(outFilePath);
}

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From source file:it.unimi.dsi.sux4j.mph.PaCoTrieDistributorMonotoneMinimalPerfectHashFunction.java

public static void main(final String[] arg) throws NoSuchMethodException, IOException, JSAPException {

    final SimpleJSAP jsap = new SimpleJSAP(
            PaCoTrieDistributorMonotoneMinimalPerfectHashFunction.class.getName(),
            "Builds an PaCo trie-based monotone minimal perfect hash function reading a newline-separated list of strings.",
            new Parameter[] {
                    new FlaggedOption("encoding", ForNameStringParser.getParser(Charset.class), "UTF-8",
                            JSAP.NOT_REQUIRED, 'e', "encoding", "The string file encoding."),
                    new Switch("huTucker", 'h', "hu-tucker", "Use Hu-Tucker coding to reduce string length."),
                    new Switch("iso", 'i', "iso",
                            "Use ISO-8859-1 coding internally (i.e., just use the lower eight bits of each character)."),
                    new Switch("utf32", JSAP.NO_SHORTFLAG, "utf-32",
                            "Use UTF-32 internally (handles surrogate pairs)."),
                    new Switch("zipped", 'z', "zipped", "The string list is compressed in gzip format."),
                    new UnflaggedOption("function", JSAP.STRING_PARSER, JSAP.NO_DEFAULT, JSAP.REQUIRED,
                            JSAP.NOT_GREEDY,
                            "The filename for the serialised monotone minimal perfect hash function."),
                    new UnflaggedOption("stringFile", JSAP.STRING_PARSER, "-", JSAP.NOT_REQUIRED,
                            JSAP.NOT_GREEDY,
                            "The name of a file containing a newline-separated list of strings, or - for standard input; in the first case, strings will not be loaded into core memory."), });

    JSAPResult jsapResult = jsap.parse(arg);
    if (jsap.messagePrinted())
        return;/*w  ww  . j a v  a 2s . c  o m*/

    final String functionName = jsapResult.getString("function");
    final String stringFile = jsapResult.getString("stringFile");
    final Charset encoding = (Charset) jsapResult.getObject("encoding");
    final boolean zipped = jsapResult.getBoolean("zipped");
    final boolean iso = jsapResult.getBoolean("iso");
    final boolean utf32 = jsapResult.getBoolean("utf32");
    final boolean huTucker = jsapResult.getBoolean("huTucker");

    final Collection<MutableString> collection;
    if ("-".equals(stringFile)) {
        final ProgressLogger pl = new ProgressLogger(LOGGER);
        pl.displayLocalSpeed = true;
        pl.displayFreeMemory = true;
        pl.start("Loading strings...");
        collection = new LineIterator(
                new FastBufferedReader(
                        new InputStreamReader(zipped ? new GZIPInputStream(System.in) : System.in, encoding)),
                pl).allLines();
        pl.done();
    } else
        collection = new FileLinesCollection(stringFile, encoding.toString(), zipped);
    final TransformationStrategy<CharSequence> transformationStrategy = huTucker
            ? new HuTuckerTransformationStrategy(collection, true)
            : iso ? TransformationStrategies.prefixFreeIso()
                    : utf32 ? TransformationStrategies.prefixFreeUtf32()
                            : TransformationStrategies.prefixFreeUtf16();

    BinIO.storeObject(new PaCoTrieDistributorMonotoneMinimalPerfectHashFunction<CharSequence>(collection,
            transformationStrategy), functionName);
    LOGGER.info("Completed.");
}

---

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