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// InflaterInputStream.java - Input stream filter for decompressing.
/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.util.zip;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
/**
* @author Tom Tromey
* @date May 17, 1999
*/
/* Written using on-line Java Platform 1.2 API Specification
* and JCL book.
* Believed complete and correct.
*/
public class InflaterInputStream extends FilterInputStream
{
protected void fill () throws IOException
{
len = in.read(buf, 0, buf.length);
if (len != -1)
inf.setInput(buf, 0, len);
}
public InflaterInputStream (InputStream in)
{
this (in, new Inflater (), 512);
}
public InflaterInputStream (InputStream in, Inflater infl)
{
this (in, infl, 512);
}
public InflaterInputStream (InputStream in, Inflater infl, int bufsize)
{
super (in);
this.inf = infl;
this.buf = new byte[bufsize];
}
public int read () throws IOException
{
byte[] buf = new byte[1];
int r = read (buf, 0, 1);
if (r != -1)
r = buf[0] & 0xff;
return r;
}
public int read (byte[] buf, int off, int len) throws IOException
{
if (inf.finished())
return -1;
if (inf.needsInput())
fill ();
if (inf.needsDictionary())
return -1;
try
{
return inf.inflate(buf, off, len);
}
catch (DataFormatException dfe)
{
throw new ZipException (dfe.getMessage());
}
}
public long skip (long n) throws IOException
{
if (n == 0)
return 0;
int min = (int) Math.min(n, 1024);
byte[] buf = new byte[min];
long s = 0;
while (n > 0)
{
int r = read (buf, 0, min);
if (r == -1)
break;
n -= r;
s += r;
}
return s;
}
// Buffer for delivering uncompressed data to inflater.
protected byte[] buf;
// Inflater used to decompress data.
protected Inflater inf;
// Number of read bytes in buf.
protected int len;
}
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