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Diffstat (limited to 'java/com/jcraft/jzlib/GZIPInputStream.java')
| -rw-r--r-- | java/com/jcraft/jzlib/GZIPInputStream.java | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/java/com/jcraft/jzlib/GZIPInputStream.java b/java/com/jcraft/jzlib/GZIPInputStream.java new file mode 100644 index 00000000..5d29dca7 --- /dev/null +++ b/java/com/jcraft/jzlib/GZIPInputStream.java @@ -0,0 +1,145 @@ +/* -*-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.*; + +public class GZIPInputStream extends InflaterInputStream { + + public GZIPInputStream(InputStream in) throws IOException { + this(in, DEFAULT_BUFSIZE, true); + } + + public GZIPInputStream(InputStream in, + int size, + boolean close_in) throws IOException { + this(in, new Inflater(15+16), size, close_in); + myinflater = true; + } + + public GZIPInputStream(InputStream in, + Inflater inflater, + int size, + boolean close_in) throws IOException { + super(in, inflater, size, close_in); + } + + public long getModifiedtime() { + return inflater.istate.getGZIPHeader().getModifiedTime(); + } + + public int getOS() { + return inflater.istate.getGZIPHeader().getOS(); + } + + public String getName() { + return inflater.istate.getGZIPHeader().getName(); + } + + public String getComment() { + return inflater.istate.getGZIPHeader().getComment(); + } + + public long getCRC() throws GZIPException { + if(inflater.istate.mode != 12 /*DONE*/) + throw new GZIPException("checksum is not calculated yet."); + return inflater.istate.getGZIPHeader().getCRC(); + } + + public void readHeader() throws IOException { + + byte[] empty = "".getBytes(); + inflater.setOutput(empty, 0, 0); + inflater.setInput(empty, 0, 0, false); + + byte[] b = new byte[10]; + + int n = fill(b); + if(n!=10){ + if(n>0){ + inflater.setInput(b, 0, n, false); + //inflater.next_in_index = n; + inflater.next_in_index = 0; + inflater.avail_in = n; + } + throw new IOException("no input"); + } + + inflater.setInput(b, 0, n, false); + + byte[] b1 = new byte[1]; + do{ + if(inflater.avail_in<=0){ + int i = in.read(b1); + if(i<=0) + throw new IOException("no input"); + inflater.setInput(b1, 0, 1, true); + } + + int err = inflater.inflate(JZlib.Z_NO_FLUSH); + + if(err!=0/*Z_OK*/){ + int len = 2048-inflater.next_in.length; + if(len>0){ + byte[] tmp = new byte[len]; + n = fill(tmp); + if(n>0){ + inflater.avail_in += inflater.next_in_index; + inflater.next_in_index = 0; + inflater.setInput(tmp, 0, n, true); + } + } + //inflater.next_in_index = inflater.next_in.length; + inflater.avail_in += inflater.next_in_index; + inflater.next_in_index = 0; + throw new IOException(inflater.msg); + } + } + while(inflater.istate.inParsingHeader()); + } + + private int fill(byte[] buf) { + int len = buf.length; + int n = 0; + do{ + int i = -1; + try { + i = in.read(buf, n, buf.length - n); + } + catch(IOException e){ + } + if(i == -1){ + break; + } + n+=i; + } + while(n<len); + return n; + } +}
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