/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright 
     notice, this list of conditions and the following disclaimer in 
     the documentation and/or other materials provided with the distribution.

  3. The names of the authors may not be used to endorse or promote products
     derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jcraft.jzlib;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class DeflaterOutputStream extends FilterOutputStream {

  public DeflaterOutputStream() {
    super(null);
  }

  protected Deflater deflater;

  protected byte[] buffer;

  private boolean closed = false;

  private boolean syncFlush = false;

  private final byte[] buf1 = new byte[1];

  protected boolean mydeflater = false;

  private boolean close_out = true;

  private static final int DEFAULT_BUFSIZE = 512;
/*
  public DeflaterOutputStream(OutputStream out) {
    this(out, new Deflater().init(JZlib.Z_DEFAULT_COMPRESSION, 0, false), DEFAULT_BUFSIZE, true);
    mydeflater = true;
  }

  public DeflaterOutputStream(OutputStream out, Deflater def) {
    this(out, def, 0, true);
  }  
  
  public DeflaterOutputStream(OutputStream out, Deflater deflater, int size) {
    this(out, deflater, size, true);
  }
*/
  /**
   * @param out
   * @param deflater
   * @param size
   * @param close_out
   *        throws IOException
   */
  protected void jzSetDOS(OutputStream out, Deflater deflater, int size,
      boolean close_out) {
    /**
     * @j2sNative this.jzSetFOS(out);
     */
    {
    //jzSetFOS(out);
    }
    //    if (out == null || deflater == null) {
    //      throw new NullPointerException();
    //    }
    //    else if (size <= 0) {
    //      throw new IllegalArgumentException("buffer size must be greater than 0");
    //    }
    if (size == 0)
      size = DEFAULT_BUFSIZE;
    this.deflater = deflater;
    buffer = new byte[size];
    this.close_out = close_out;
  }

//  @Override
  public void writeByteAsInt(int b) throws IOException {
    buf1[0] = (byte) (b & 0xff);
    write(buf1, 0, 1);
  }
  
  @Override
  public void write(byte[] b, int off, int len) throws IOException {
    if (deflater.finished())
      throw new IOException("finished");

    if (off < 0 | len < 0 | off + len > b.length)
      throw new IndexOutOfBoundsException();
    if (len == 0)
      return;

    int flush = syncFlush ? JZlib.Z_SYNC_FLUSH : JZlib.Z_NO_FLUSH;
    deflater.setInput(b, off, len, true);
    while (deflater.avail_in > 0) {
      int err = deflate(flush);
      if (err == JZlib.Z_STREAM_END)
        break;
    }
  }

  public void finish() throws IOException {
    while (!deflater.finished()) {
      deflate(JZlib.Z_FINISH);
    }
  }

  @Override
  public void close() throws IOException {
    if (!closed) {
      finish();
      if (mydeflater) {
        deflater.end();
      }
      if (close_out)
        out.close();
      closed = true;
    }
  }

  protected int deflate(int flush) throws IOException {
    deflater.setOutput(buffer, 0, buffer.length);
    int err = deflater.deflate(flush);
    switch (err) {
    case JZlib.Z_OK:
    case JZlib.Z_STREAM_END:
      break;
    case JZlib.Z_BUF_ERROR:
      if (deflater.avail_in <= 0 && flush != JZlib.Z_FINISH) {
        // flush() without any data
        break;
      }
      //$FALL-THROUGH$
    default:
      throw new IOException("failed to deflate");
    }
    int len = deflater.next_out_index;
    if (len > 0) {
        out.write(buffer, 0, len);
    }
    return err;
  }

  @Override
  public void flush() throws IOException {
    if (syncFlush && !deflater.finished()) {
      while (true) {
        int err = deflate(JZlib.Z_SYNC_FLUSH);
        if (deflater.next_out_index < buffer.length)
          break;
        if (err == JZlib.Z_STREAM_END)
          break;
      }
    }
    out.flush();
  }

  public long getTotalIn() {
    return deflater.getTotalIn();
  }

  public long getTotalOut() {
    return deflater.getTotalOut();
  }

  public void setSyncFlush(boolean syncFlush) {
    this.syncFlush = syncFlush;
  }

  public boolean getSyncFlush() {
    return this.syncFlush;
  }

  public Deflater getDeflater() {
    return deflater;
  }
}
