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JSch is a pure Java implementation of SSH2
There is a newer version: 0.2.21
/*
 * 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.
 */
/*
 * This program is based on zlib-1.1.3, so all credit should go authors Jean-loup
 * Gailly([email protected]) and Mark Adler([email protected]) and contributors of zlib.
 */

package com.jcraft.jsch.jzlib;

final class Deflater extends ZStream {

  private static final int MAX_WBITS = 15; // 32K LZ77 window
  private static final int DEF_WBITS = MAX_WBITS;

  private static final int Z_NO_FLUSH = 0;
  private static final int Z_PARTIAL_FLUSH = 1;
  private static final int Z_SYNC_FLUSH = 2;
  private static final int Z_FULL_FLUSH = 3;
  private static final int Z_FINISH = 4;

  private static final int MAX_MEM_LEVEL = 9;

  private static final int Z_OK = 0;
  private static final int Z_STREAM_END = 1;
  private static final int Z_NEED_DICT = 2;
  private static final int Z_ERRNO = -1;
  private static final int Z_STREAM_ERROR = -2;
  private static final int Z_DATA_ERROR = -3;
  private static final int Z_MEM_ERROR = -4;
  private static final int Z_BUF_ERROR = -5;
  private static final int Z_VERSION_ERROR = -6;

  private boolean finished = false;

  Deflater() {
    super();
  }

  Deflater(int level) throws GZIPException {
    this(level, MAX_WBITS);
  }

  Deflater(int level, boolean nowrap) throws GZIPException {
    this(level, MAX_WBITS, nowrap);
  }

  Deflater(int level, int bits) throws GZIPException {
    this(level, bits, false);
  }

  Deflater(int level, int bits, boolean nowrap) throws GZIPException {
    super();
    int ret = init(level, bits, nowrap);
    if (ret != Z_OK)
      throw new GZIPException(ret + ": " + msg);
  }

  Deflater(int level, int bits, int memlevel, JZlib.WrapperType wrapperType) throws GZIPException {
    super();
    int ret = init(level, bits, memlevel, wrapperType);
    if (ret != Z_OK)
      throw new GZIPException(ret + ": " + msg);
  }

  Deflater(int level, int bits, int memlevel) throws GZIPException {
    super();
    int ret = init(level, bits, memlevel);
    if (ret != Z_OK)
      throw new GZIPException(ret + ": " + msg);
  }

  int init(int level) {
    return init(level, MAX_WBITS);
  }

  int init(int level, boolean nowrap) {
    return init(level, MAX_WBITS, nowrap);
  }

  int init(int level, int bits) {
    return init(level, bits, false);
  }

  int init(int level, int bits, int memlevel, JZlib.WrapperType wrapperType) {
    if (bits < 9 || bits > 15) {
      return Z_STREAM_ERROR;
    }
    if (wrapperType == JZlib.W_NONE) {
      bits *= -1;
    } else if (wrapperType == JZlib.W_GZIP) {
      bits += 16;
    } else if (wrapperType == JZlib.W_ANY) {
      return Z_STREAM_ERROR;
    } else if (wrapperType == JZlib.W_ZLIB) {
    }
    return init(level, bits, memlevel);
  }

  int init(int level, int bits, int memlevel) {
    finished = false;
    dstate = new Deflate(this);
    return dstate.deflateInit(level, bits, memlevel);
  }

  int init(int level, int bits, boolean nowrap) {
    finished = false;
    dstate = new Deflate(this);
    return dstate.deflateInit(level, nowrap ? -bits : bits);
  }

  @Override
  int deflate(int flush) {
    if (dstate == null) {
      return Z_STREAM_ERROR;
    }
    int ret = dstate.deflate(flush);
    if (ret == Z_STREAM_END)
      finished = true;
    return ret;
  }

  @Override
  int end() {
    finished = true;
    if (dstate == null)
      return Z_STREAM_ERROR;
    int ret = dstate.deflateEnd();
    dstate = null;
    free();
    return ret;
  }

  int params(int level, int strategy) {
    if (dstate == null)
      return Z_STREAM_ERROR;
    return dstate.deflateParams(level, strategy);
  }

  int setDictionary(byte[] dictionary, int dictLength) {
    if (dstate == null)
      return Z_STREAM_ERROR;
    return dstate.deflateSetDictionary(dictionary, dictLength);
  }

  @Override
  boolean finished() {
    return finished;
  }

  int copy(Deflater src) {
    this.finished = src.finished;
    return Deflate.deflateCopy(this, src);
  }
}