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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.jvnet.mimepull;

import java.io.InputStream;
import java.io.IOException;

/**
 * Constructs a InputStream from a linked list of {@link Chunk}s.
 * 
 * @author Kohsuke Kawaguchi
 * @author Jitendra Kotamraju
 */
final class ChunkInputStream extends InputStream {
    Chunk current;
    int offset;
    int len;
    final MIMEMessage msg;
    final MIMEPart part;
    byte[] buf;

    public ChunkInputStream(MIMEMessage msg, MIMEPart part, Chunk startPos) {
        this.current = startPos;
        len = current.data.size();
        buf = current.data.read();
        this.msg = msg;
        this.part = part;
    }

    @Override
    public int read(byte b[], int off, int sz) throws IOException {
        if (!fetch()) {
            return -1;
        }

        sz = Math.min(sz, len-offset);
        System.arraycopy(buf,offset,b,off,sz);
        return sz;
    }

    public int read() throws IOException {
        if (!fetch()) {
            return -1;
        }
        return (buf[offset++] & 0xff);
    }

    /**
     * Gets to the next chunk if we are done with the current one.
     * @return
     */
    private boolean fetch() {
        if (current == null) {
            throw new IllegalStateException("Stream already closed");
        }
        while(offset==len) {
            while(!part.parsed && current.next == null) {
                msg.makeProgress();
            }
            current = current.next;

            if (current == null) {
                return false;
            }
            this.offset = 0;
            this.buf = current.data.read();
            this.len = current.data.size();
        }
        return true;
    }

    @Override
    public void close() throws IOException {
        super.close();
        current = null;
    }
}