Example usage for org.apache.commons.compress.compressors.pack200 Pack200CompressorInputStream matches

Introduction

In this page you can find the example usage for org.apache.commons.compress.compressors.pack200 Pack200CompressorInputStream matches.

Prototype

public static boolean matches(final byte[] signature, final int length) 

Source Link

Document

Checks if the signature matches what is expected for a pack200 file (0xCAFED00D).

Usage

From source file:org.apache.tika.parser.pkg.TikaCompressorStreamFactory.java

/**
 * Try to detect the type of compressor stream.
 *
 * @param in input stream//from ww w  .  j  a va 2  s.co  m
 * @return type of compressor stream detected
 * @throws CompressorException if no compressor stream type was detected
 *                             or if something else went wrong
 * @throws IllegalArgumentException if stream is null or does not support mark
 *
 * @since 1.14
 */
public static String detect(final InputStream in) throws CompressorException {
    if (in == null) {
        throw new IllegalArgumentException("Stream must not be null.");
    }

    if (!in.markSupported()) {
        throw new IllegalArgumentException("Mark is not supported.");
    }

    final byte[] signature = new byte[12];
    in.mark(signature.length);
    int signatureLength = -1;
    try {
        signatureLength = IOUtils.readFully(in, signature);
        in.reset();
    } catch (IOException e) {
        throw new CompressorException("IOException while reading signature.", e);
    }

    if (BZip2CompressorInputStream.matches(signature, signatureLength)) {
        return BZIP2;
    }

    if (GzipCompressorInputStream.matches(signature, signatureLength)) {
        return GZIP;
    }

    if (Pack200CompressorInputStream.matches(signature, signatureLength)) {
        return PACK200;
    }

    if (FramedSnappyCompressorInputStream.matches(signature, signatureLength)) {
        return SNAPPY_FRAMED;
    }

    if (ZCompressorInputStream.matches(signature, signatureLength)) {
        return Z;
    }

    if (DeflateCompressorInputStream.matches(signature, signatureLength)) {
        return DEFLATE;
    }

    if (XZUtils.matches(signature, signatureLength)) {
        return XZ;
    }

    if (LZMAUtils.matches(signature, signatureLength)) {
        return LZMA;
    }

    /*            if (FramedLZ4CompressorInputStream.matches(signature, signatureLength)) {
        return LZ4_FRAMED;
    }*/

    throw new CompressorException("No Compressor found for the stream signature.");
}

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