org.sonar.plugins.erlang.cover.FixedOtpInputStream.java Source code

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Here is the source code for org.sonar.plugins.erlang.cover.FixedOtpInputStream.java

Source

/*
 * SonarQube Erlang Plugin
 * Copyright (C) 2012 Tamas Kende
 * kende.tamas@gmail.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.plugins.erlang.cover;

import com.ericsson.otp.erlang.OtpErlangDecodeException;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpExternal;
import com.ericsson.otp.erlang.OtpInputStream;
import com.google.common.io.Closeables;

import java.io.IOException;
import java.util.zip.Inflater;

/**
 * {@link OtpInputStream} with read_compressed fixed for Mac OS X.
 *
 * @see <a href="http://erlang.org/pipermail/erlang-patches/2009-September/000478.html">Bug+patch: jinterface, OtpInputStream.java</a>
 */
public class FixedOtpInputStream extends OtpInputStream {
    private final int flags;

    public FixedOtpInputStream(byte[] buf) {
        super(buf);
        flags = 0;
    }

    public FixedOtpInputStream(byte[] buf, int flags) {
        super(buf, flags);
        this.flags = flags;
    }

    public FixedOtpInputStream(byte[] buf, int offset, int length, int flags) {
        super(buf, offset, length, flags);
        this.flags = flags;
    }

    @Override
    public OtpErlangObject read_compressed() throws OtpErlangDecodeException {
        final int tag = read1skip_version();

        if (tag != OtpExternal.compressedTag) {
            throw new OtpErlangDecodeException(
                    "Wrong tag encountered, expected " + OtpExternal.compressedTag + ", got " + tag);
        }

        final int size = read4BE();
        final byte[] buf = new byte[size];
        final java.util.zip.InflaterInputStream is = new java.util.zip.InflaterInputStream(this, new Inflater(),
                size);
        try {
            final int dsize = is.read(buf, 0, size);
            if (dsize != size) {
                throw new OtpErlangDecodeException("Decompression gave " + dsize + " bytes, not " + size);
            }
            is.close();
        } catch (final IOException e) {
            throw new OtpErlangDecodeException("Cannot read from input stream");
        }

        final OtpInputStream ois = new OtpInputStream(buf, flags);
        OtpErlangObject ret = ois.read_any();
        Closeables.closeQuietly(ois);
        return ret;
    }
}