List of usage examples for java.util.zip GZIPInputStream GZIP_MAGIC
int GZIP_MAGIC
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From source file:gobblin.util.io.StreamUtils.java
public static boolean isCompressed(byte[] bytes) { if ((bytes == null) || (bytes.length < 2)) { return false; } else {/* w w w .j av a 2 s . c om*/ return ((bytes[0] == (byte) (GZIPInputStream.GZIP_MAGIC)) && (bytes[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8))); } }
From source file:org.xlcloud.commons.compress.CompressUtils.java
/** * Checks if an input stream is gzipped. * /*from w w w .ja v a 2 s.c om*/ * @param in * @return */ public static boolean isGZipped(InputStream in) { if (!in.markSupported()) { in = new BufferedInputStream(in); } in.mark(0); int magic = 0; try { magic = in.read() & 0xff | ((in.read() << 8) & 0xff00); in.reset(); } catch (IOException e) { e.printStackTrace(System.err); return false; } return magic == GZIPInputStream.GZIP_MAGIC; }
From source file:com.krawler.common.util.ByteUtil.java
/** * Determines if the data contained in the buffer is gzipped by matching the * first 2 bytes with GZIP magic GZIP_MAGIC (0x8b1f). * /* ww w . j a va2 s . c o m*/ * @param data * @return */ public static boolean isGzipped(byte[] data) { return data != null && data.length > 2 && ((data[0] | (data[1] << 8)) == GZIPInputStream.GZIP_MAGIC); }
From source file:org.ut.biolab.medsavant.shared.util.IOUtils.java
/** * Checks if an input stream is gzipped. * * @param in//w ww. j av a 2 s.c o m * @return */ public static boolean isGZipped(InputStream in) { if (!in.markSupported()) { in = new BufferedInputStream(in); } in.mark(2); int magic = 0; try { magic = in.read() & 0xff | ((in.read() << 8) & 0xff00); in.reset(); } catch (IOException e) { e.printStackTrace(System.err); return false; } return magic == GZIPInputStream.GZIP_MAGIC; }
From source file:org.ut.biolab.medsavant.shared.util.IOUtils.java
/** * Checks if a file is gzipped./* ww w. j a v a 2s .com*/ * * @param f * @return */ public static boolean isGZipped(File f) { int magic = 0; try { RandomAccessFile raf = new RandomAccessFile(f, "r"); magic = raf.read() & 0xff | ((raf.read() << 8) & 0xff00); raf.close(); } catch (Throwable e) { e.printStackTrace(System.err); } return magic == GZIPInputStream.GZIP_MAGIC; }
From source file:com.zimbra.common.util.ByteUtil.java
/** * Determines if the data contained in the buffer is gzipped * by matching the first 2 bytes with GZIP magic GZIP_MAGIC (0x8b1f). * @param data//from www.ja v a 2 s . com * @return */ public static boolean isGzipped(byte[] data) { if (data == null || data.length < 2) { return false; } int byte1 = data[0]; int byte2 = data[1] & 0xff; // Remove sign, since bytes are signed in Java. return (byte1 | (byte2 << 8)) == GZIPInputStream.GZIP_MAGIC; }
From source file:com.zimbra.common.util.ByteUtil.java
/** * Determines if the data in the given stream is gzipped. * Requires that the <tt>InputStream</tt> supports mark/reset. *//* w ww.j a va 2s .c o m*/ public static boolean isGzipped(InputStream in) throws IOException { in.mark(2); int header = in.read() | (in.read() << 8); in.reset(); if (header == GZIPInputStream.GZIP_MAGIC) { return true; } return false; }
From source file:net.yacy.kelondro.util.FileUtils.java
/** * This function determines if a byte array is gzip compressed and uncompress it * * @param source properly gzip compressed byte array * @return uncompressed byte array/* ww w . java 2s . c om*/ * @throws IOException */ public static byte[] uncompressGZipArray(byte[] source) throws IOException { if (source == null) { return null; } // support of gzipped data (requested by roland) /* "Bitwise OR of signed byte value * * [...] Values loaded from a byte array are sign extended to 32 bits before * any any bitwise operations are performed on the value. Thus, if b[0] * contains the value 0xff, and x is initially 0, then the code ((x << * 8) | b[0]) will sign extend 0xff to get 0xffffffff, and thus give the * value 0xffffffff as the result. [...]" findbugs description of BIT_IOR_OF_SIGNED_BYTE */ if ((source.length > 1) && (((source[1] << 8) | (source[0] & 0xff)) == GZIPInputStream.GZIP_MAGIC)) { System.out.println("DEBUG: uncompressGZipArray - uncompressing source"); try { final ByteArrayInputStream byteInput = new ByteArrayInputStream(source); final ByteArrayOutputStream byteOutput = new ByteArrayOutputStream(source.length / 5); final GZIPInputStream zippedContent = new GZIPInputStream(byteInput); final byte[] data = new byte[1024]; int read = 0; // reading gzip file and store it uncompressed while ((read = zippedContent.read(data, 0, 1024)) != -1) { byteOutput.write(data, 0, read); } zippedContent.close(); byteOutput.close(); source = byteOutput.toByteArray(); } catch (final Exception e) { if (!e.getMessage().equals("Not in GZIP format")) { throw new IOException(e.getMessage()); } } } return source; }
From source file:com.github.pascalgn.jiracli.web.HttpClient.java
private static InputStream maybeDecompress(InputStream input) throws IOException { // Due to a bug, Jira sometimes returns double-compressed responses. See JRA-37608 BufferedInputStream buffered = new BufferedInputStream(input, 2); buffered.mark(2);/*from www. j av a 2 s . c o m*/ int[] buf = new int[2]; buf[0] = buffered.read(); buf[1] = buffered.read(); buffered.reset(); int header = (buf[1] << 8) | buf[0]; if (header == GZIPInputStream.GZIP_MAGIC) { return new GZIPInputStream(buffered); } else { return buffered; } }
From source file:VCF.VCF.java
private static boolean isGZipped(File f) throws IOException { int magic;//from w ww. ja v a 2 s . c o m RandomAccessFile raf = new RandomAccessFile(f, "r"); magic = raf.read() & 0xff | ((raf.read() << 8) & 0xff00); raf.close(); return magic == GZIPInputStream.GZIP_MAGIC; }