113 lines
2.2 KiB
Java
113 lines
2.2 KiB
Java
// 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 (this.len == -1)
|
|
return -1; // Couldn't get any more data to feed to the Inflater
|
|
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;
|
|
min = (int) Math.min(n, 1024);
|
|
}
|
|
|
|
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;
|
|
}
|