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112 lines
3.1 KiB
Java
112 lines
3.1 KiB
Java
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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//
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// A ZlibInStream reads from a zlib.io.InputStream
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//
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public class ZlibInStream extends InStream {
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static final int defaultBufSize = 16384;
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public ZlibInStream(int bufSize_) {
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bufSize = bufSize_;
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b = new byte[bufSize];
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ptr = end = ptrOffset = 0;
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inflater = new java.util.zip.Inflater();
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}
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public ZlibInStream() { this(defaultBufSize); }
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public void setUnderlying(InStream is, int bytesIn_) {
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underlying = is;
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bytesIn = bytesIn_;
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ptr = end = 0;
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}
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public void reset() throws Exception {
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ptr = end = 0;
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if (underlying == null) return;
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while (bytesIn > 0) {
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decompress();
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end = 0; // throw away any data
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}
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underlying = null;
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}
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public int pos() { return ptrOffset + ptr; }
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protected int overrun(int itemSize, int nItems) throws Exception {
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if (itemSize > bufSize)
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throw new Exception("ZlibInStream overrun: max itemSize exceeded");
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if (underlying == null)
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throw new Exception("ZlibInStream overrun: no underlying stream");
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if (end - ptr != 0)
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System.arraycopy(b, ptr, b, 0, end - ptr);
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ptrOffset += ptr;
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end -= ptr;
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ptr = 0;
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while (end < itemSize) {
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decompress();
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}
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if (itemSize * nItems > end)
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nItems = end / itemSize;
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return nItems;
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}
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// decompress() calls the decompressor once. Note that this won't
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// necessarily generate any output data - it may just consume some input
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// data. Returns false if wait is false and we would block on the underlying
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// stream.
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private void decompress() throws Exception {
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try {
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underlying.check(1);
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int avail_in = underlying.getend() - underlying.getptr();
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if (avail_in > bytesIn)
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avail_in = bytesIn;
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if (inflater.needsInput()) {
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inflater.setInput(underlying.getbuf(), underlying.getptr(), avail_in);
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}
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int n = inflater.inflate(b, end, bufSize - end);
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end += n;
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if (inflater.needsInput()) {
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bytesIn -= avail_in;
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underlying.setptr(underlying.getptr() + avail_in);
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}
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} catch (java.util.zip.DataFormatException e) {
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throw new Exception("ZlibInStream: inflate failed");
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}
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}
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private InStream underlying;
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private int bufSize;
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private int ptrOffset;
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private java.util.zip.Inflater inflater;
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private int bytesIn;
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}
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