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+ − /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
+ − /*
+ − Copyright (c) 2000,2001,2002,2003 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(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
+ − * and contributors of zlib.
+ − */
+ −
+ − package com.jcraft.jzlib;
+ −
+ − final public class ZStream {
+ −
+ − static final private int MAX_WBITS = 15; // 32K LZ77 window
+ − static final private int DEF_WBITS = MAX_WBITS;
+ −
+ − static final private int Z_NO_FLUSH = 0;
+ − static final private int Z_PARTIAL_FLUSH = 1;
+ − static final private int Z_SYNC_FLUSH = 2;
+ − static final private int Z_FULL_FLUSH = 3;
+ − static final private int Z_FINISH = 4;
+ −
+ − static final private int MAX_MEM_LEVEL = 9;
+ −
+ − static final private int Z_OK = 0;
+ − static final private int Z_STREAM_END = 1;
+ − static final private int Z_NEED_DICT = 2;
+ − static final private int Z_ERRNO = -1;
+ − static final private int Z_STREAM_ERROR = -2;
+ − static final private int Z_DATA_ERROR = -3;
+ − static final private int Z_MEM_ERROR = -4;
+ − static final private int Z_BUF_ERROR = -5;
+ − static final private int Z_VERSION_ERROR = -6;
+ −
+ − public byte[] next_in; // next input byte
+ − public int next_in_index;
+ − public int avail_in; // number of bytes available at next_in
+ − public long total_in; // total nb of input bytes read so far
+ −
+ − public byte[] next_out; // next output byte should be put there
+ − public int next_out_index;
+ − public int avail_out; // remaining free space at next_out
+ − public long total_out; // total nb of bytes output so far
+ −
+ − public String msg;
+ −
+ − Deflate dstate;
+ − Inflate istate;
+ −
+ − int data_type; // best guess about the data type: ascii or binary
+ −
+ − public long adler;
+ − Adler32 _adler = new Adler32();
+ −
+ − public int inflateInit() {
+ − return inflateInit(DEF_WBITS);
+ − }
+ − public int inflateInit(boolean nowrap) {
+ − return inflateInit(DEF_WBITS, nowrap);
+ − }
+ − public int inflateInit(int w) {
+ − return inflateInit(w, false);
+ − }
+ −
+ − public int inflateInit(int w, boolean nowrap) {
+ − istate = new Inflate();
+ − return istate.inflateInit(this, nowrap ? -w : w);
+ − }
+ −
+ − public int inflate(int f) {
+ − if (istate == null) return Z_STREAM_ERROR;
+ −
+ − return istate.inflate(this, f);
+ − }
+ − public int inflateEnd() {
+ − if (istate == null) return Z_STREAM_ERROR;
+ −
+ − int ret = istate.inflateEnd(this);
+ − istate = null;
+ − return ret;
+ − }
+ − public int inflateSync() {
+ − if (istate == null)
+ − return Z_STREAM_ERROR;
+ −
+ − return istate.inflateSync(this);
+ − }
+ − public int inflateSetDictionary(byte[] dictionary, int dictLength) {
+ − if (istate == null)
+ − return Z_STREAM_ERROR;
+ −
+ − return istate.inflateSetDictionary(this, dictionary, dictLength);
+ − }
+ −
+ − public int deflateInit(int level) {
+ − return deflateInit(level, MAX_WBITS);
+ − }
+ − public int deflateInit(int level, boolean nowrap) {
+ − return deflateInit(level, MAX_WBITS, nowrap);
+ − }
+ − public int deflateInit(int level, int bits) {
+ − return deflateInit(level, bits, false);
+ − }
+ − public int deflateInit(int level, int bits, boolean nowrap) {
+ − dstate = new Deflate();
+ − return dstate.deflateInit(this, level, nowrap ? -bits : bits);
+ − }
+ − public int deflate(int flush) {
+ − if (dstate == null) {
+ − return Z_STREAM_ERROR;
+ − }
+ −
+ − return dstate.deflate(this, flush);
+ − }
+ − public int deflateEnd() {
+ − if (dstate == null) return Z_STREAM_ERROR;
+ −
+ − int ret = dstate.deflateEnd();
+ − dstate = null;
+ − return ret;
+ − }
+ − public int deflateParams(int level, int strategy) {
+ − if (dstate == null) return Z_STREAM_ERROR;
+ −
+ − return dstate.deflateParams(this, level, strategy);
+ − }
+ − public int deflateSetDictionary(byte[] dictionary, int dictLength) {
+ − if (dstate == null)
+ − return Z_STREAM_ERROR;
+ −
+ − return dstate.deflateSetDictionary(this, dictionary, dictLength);
+ − }
+ −
+ − // Flush as much pending output as possible. All deflate() output goes
+ − // through this function so some applications may wish to modify it
+ − // to avoid allocating a large strm->next_out buffer and copying into it.
+ − // (See also read_buf()).
+ − void flush_pending() {
+ − int len = dstate.pending;
+ −
+ − if (len > avail_out) len = avail_out;
+ −
+ − if (len == 0) return;
+ −
+ − if (dstate.pending_buf.length <= dstate.pending_out ||
+ − next_out.length <= next_out_index ||
+ − dstate.pending_buf.length < (dstate.pending_out + len) ||
+ − next_out.length < (next_out_index + len)) {
+ − System.out.println(dstate.pending_buf.length + ", " + dstate.pending_out +
+ − ", " + next_out.length + ", " + next_out_index + ", " + len);
+ − System.out.println("avail_out=" + avail_out);
+ − }
+ −
+ − System.arraycopy(dstate.pending_buf, dstate.pending_out,
+ − next_out, next_out_index, len);
+ − next_out_index += len;
+ − dstate.pending_out += len;
+ − total_out += len;
+ − avail_out -= len;
+ − dstate.pending -= len;
+ −
+ − if (dstate.pending == 0) {
+ − dstate.pending_out = 0;
+ − }
+ − }
+ −
+ − // Read a new buffer from the current input stream, update the adler32
+ − // and total number of bytes read. All deflate() input goes through
+ − // this function so some applications may wish to modify it to avoid
+ − // allocating a large strm->next_in buffer and copying from it.
+ − // (See also flush_pending()).
+ − int read_buf(byte[] buf, int start, int size) {
+ − int len = avail_in;
+ −
+ − if (len > size) len = size;
+ −
+ − if (len == 0) return 0;
+ −
+ − avail_in -= len;
+ −
+ − if (dstate.noheader == 0) {
+ − adler = _adler.adler32(adler, next_in, next_in_index, len);
+ − }
+ −
+ − System.arraycopy(next_in, next_in_index, buf, start, len);
+ − next_in_index += len;
+ − total_in += len;
+ − return len;
+ − }
+ −
+ − public void free() {
+ − next_in = null;
+ − next_out = null;
+ − msg = null;
+ − _adler = null;
+ − }
+ − }