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 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
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 * except in compliance with the License. You may obtain a copy of
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 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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 * rights and limitations under the License.
 *
 * Copyright (C) 2006 Evan <evan@heron.sytes.net>
 * 
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.jruby.util;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.jruby.Ruby;
import org.jruby.util.IOHandlerUnseekable;

public class IOHandlerSocket extends IOHandlerUnseekable {
    public IOHandlerSocket(Ruby runtime, InputStream inStream, OutputStream outStream) 
        throws IOException {
        super(runtime, inStream, outStream);
    }

    public ByteList recv(int len) throws IOException, BadDescriptorException {
        if(!isOpen()) {
            throw new IOException("Socket not open");
        }
        if(len < 1) {
            return new ByteList(ByteList.NULL_ARRAY);
        }

        // this should provide blocking until data is available...
        int c = sysread();
        if (c == -1) {
            throw new EOFException();
        }
        int available = getInputStream().available();
        len = len - 1 < available ? len - 1 : available;
        ByteList buf = new ByteList(len + 1);
        buf.append(c);
        sysread(buf, 1, len);
        return buf;
    }
}