Example usage for java.util.zip GZIPInputStream GZIP_MAGIC

Introduction

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

Prototype

int GZIP_MAGIC

To view the source code for java.util.zip GZIPInputStream GZIP_MAGIC.

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Document

GZIP header magic number.

Usage

From source file:Main.java

static public final boolean isGzipStm(InputStream in) throws IOException {
    boolean ms = in.markSupported();
    if (ms)/*from  ww w.j  a v a2  s. com*/
        in.mark(10);
    int b1 = in.read();
    int b2 = in.read();
    if (ms)
        in.reset();
    return ((b2 << 8 | b1) == GZIPInputStream.GZIP_MAGIC);
}

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From source file:Main.java

/**
 * Checks the InputStream if it contains  GZIP compressed data
 *
 * @param inputStream InputStream to be checked
 * @return true or false if the stream contains GZIP compressed data
 * @throws java.io.IOException/* w w  w. java  2s  .co  m*/
 */
public static boolean isInputStreamGZIPCompressed(final PushbackInputStream inputStream) throws IOException {
    if (inputStream == null)
        return false;

    byte[] signature = new byte[2];
    int readStatus = inputStream.read(signature);
    inputStream.unread(signature);
    int streamHeader = ((int) signature[0] & 0xff) | ((signature[1] << 8) & 0xff00);
    return readStatus == 2 && GZIPInputStream.GZIP_MAGIC == streamHeader;
}

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From source file:org.mule.util.compression.GZipCompression.java

/**
 * Determines if a byte array is compressed. The java.util.zip GZip
 * implementaiton does not expose the GZip header so it is difficult to determine
 * if a string is compressed.//from  www  .j a  v  a2s . c  om
 * 
 * @param bytes an array of bytes
 * @return true if the array is compressed or false otherwise
 * @throws java.io.IOException if the byte array couldn't be read
 */
public boolean isCompressed(byte[] bytes) throws IOException {
    if ((bytes == null) || (bytes.length < 2)) {
        return false;
    } else {
        return ((bytes[0] == (byte) (GZIPInputStream.GZIP_MAGIC))
                && (bytes[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8)));
    }
}

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From source file:io.dacopancm.socketdcm.helper.HelperUtil.java

public static boolean isCompressed(byte[] bytes) throws IOException {
    if ((bytes == null) || (bytes.length < 2)) {
        return false;
    } else {// w  w  w . jav a 2s  .co m
        return ((bytes[0] == (byte) (GZIPInputStream.GZIP_MAGIC))
                && (bytes[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8)));
    }
}

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From source file:com.blockwithme.longdb.tools.Utils.java

/** Reads first 2 bytes, checks if its equal to GZIPInputStream.GZIP_MAGIC
 * //from w  ww  .  j  a  v a2s . c om
 * @param theFile
 *        the file
 * @return true, if compressed
 * @throws Exception */
public static boolean compressed(final File theFile) throws Exception {
    // TODO: I the file name ends with .gz, then I think that we
    // don't need to check
    FileInputStream fis = null;
    try {
        fis = FileUtils.openInputStream(theFile);
        while (true) {
            final byte[] bytes = new byte[2];
            fis.read(bytes);
            final int head = (bytes[0] & BYTE_MASK) | ((bytes[1] << BYTE_BITS) & SECOND_BYTE_MASK);
            return head == GZIPInputStream.GZIP_MAGIC;
        }
    } finally {
        if (fis != null)
            fis.close();
    }
}

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From source file:gedi.util.io.text.LineOrientedFile.java

public boolean isGZIP() throws IOException {
    if (gzipped == null) {
        if (!exists())
            gzipped = getPath().endsWith(".gz");
        else {//from w w  w. j  a v  a 2 s . c o m
            InputStream in = createInputStream();
            try {
                gzipped = in.read() == (GZIPInputStream.GZIP_MAGIC & 0xFF)
                        && in.read() == (GZIPInputStream.GZIP_MAGIC >> 8);
            } finally {
                in.close();
            }
        }
    }
    return gzipped;
}

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From source file:byps.BWire.java

/**
 * Reads a ByteBuffer from an InputStream
 * Closes the InputStream./*from w ww.j a  v  a 2s  .  c om*/
 * @param is
 * @return
 * @throws IOException
 */
public static ByteBuffer bufferFromStream(InputStream is, Boolean gzip) throws IOException {
    if (is == null)
        return null;
    try {
        ByteBuffer ibuf = ByteBuffer.allocate(10 * 1000);

        if (gzip != null) {
            if (gzip) {
                is = new GZIPInputStream(is);
            }
        } else {
            if (!is.markSupported())
                is = new BufferedInputStream(is, 2);
            is.mark(2);
            int magic = is.read() | (is.read() << 8);
            is.reset();
            if (magic == GZIPInputStream.GZIP_MAGIC) {
                is = new GZIPInputStream(is);
            }
        }

        ReadableByteChannel rch = Channels.newChannel(is);
        while (rch.read(ibuf) != -1) {
            if (ibuf.remaining() == 0) {
                ByteBuffer nbuf = ByteBuffer.allocate(ibuf.capacity() * 2);
                ibuf.flip();
                nbuf.put(ibuf);
                ibuf = nbuf;
            }
        }

        ibuf.flip();
        return ibuf;
    } finally {
        is.close();
    }
}

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From source file:com.netflix.dyno.connectionpool.impl.utils.ZipUtils.java

/**
 * Determines if a byte array is compressed. The java.util.zip GZip
 * implementation does not expose the GZip header so it is difficult to determine
 * if a string is compressed.//from www  .j  av  a2s . co  m
 *
 * @param bytes an array of bytes
 * @return true if the array is compressed or false otherwise
 * @throws java.io.IOException if the byte array couldn't be read
 */
public static boolean isCompressed(byte[] bytes) throws IOException {
    return bytes != null && bytes.length >= 2 && bytes[0] == (byte) (GZIPInputStream.GZIP_MAGIC)
            && bytes[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8);
}

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From source file:com.breadwallet.tools.util.BRCompressor.java

public static boolean isGZIPStream(byte[] bytes) {
    return bytes[0] == (byte) GZIPInputStream.GZIP_MAGIC
            && bytes[1] == (byte) (GZIPInputStream.GZIP_MAGIC >>> 8);
}

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From source file:org.bndtools.rt.repository.server.RepositoryResourceComponent.java

private static boolean isGZip(InputStream bufferedStream) throws IOException {
    assert bufferedStream.markSupported();

    bufferedStream.mark(2);/*from ww  w .ja  va2 s.c o m*/
    int magic = readUShort(bufferedStream);
    bufferedStream.reset();

    return magic == GZIPInputStream.GZIP_MAGIC;
}

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