GZIPOutputStream.java

/* -*-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.

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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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package com.jcraft.jzlib;
import java.io.*;

public class GZIPOutputStream extends DeflaterOutputStream {

  public GZIPOutputStream(OutputStream out) throws IOException {
    this(out, DEFAULT_BUFSIZE);
  }

  public GZIPOutputStream(OutputStream out, int size) throws IOException {
    this(out, size, true);
  }

  public GZIPOutputStream(OutputStream out, 
                          int size,
                          boolean close_out) throws IOException {
    this(out,
         new Deflater(JZlib.Z_DEFAULT_COMPRESSION, 15+16),
         size, close_out);
    mydeflater=true; 
  }

  public GZIPOutputStream(OutputStream out, 
                          Deflater deflater,
                          int size,
                          boolean close_out) throws IOException{
    super(out, deflater, size, close_out);
  }


  private void check() throws GZIPException {
    if(deflater.dstate.status != 42 /*INIT_STATUS*/)
      throw new GZIPException("header is already written.");
  }

  public void setModifiedTime(long mtime) throws GZIPException {
    check();
    deflater.dstate.getGZIPHeader().setModifiedTime(mtime);
  }

  public void setOS(int os) throws GZIPException {
    check();
    deflater.dstate.getGZIPHeader().setOS(os);
  }

  public void setName(String name) throws GZIPException {
    check();
    deflater.dstate.getGZIPHeader().setName(name);
  }

  public void setComment(String comment) throws GZIPException {
    check();
    deflater.dstate.getGZIPHeader().setComment(comment);
  }

  public long getCRC() throws GZIPException {
    if(deflater.dstate.status != 666 /*FINISH_STATE*/)
      throw new GZIPException("checksum is not calculated yet.");
    return deflater.dstate.getGZIPHeader().getCRC();
  }
}