152 lines
3.1 KiB
Java
152 lines
3.1 KiB
Java
|
/* Copyright (C) 1998, 1999 Cygnus Solutions
|
||
|
|
||
|
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.io;
|
||
|
import gnu.gcj.convert.*;
|
||
|
|
||
|
/**
|
||
|
* @author Per Bothner <bothner@cygnus.com>
|
||
|
* @date April 22, 1998.
|
||
|
*/
|
||
|
/* Written using "Java Class Libraries", 2nd edition, plus online
|
||
|
* API docs for JDK 1.2 beta from http://www.javasoft.com.
|
||
|
* Status: Believed complete and correct, but only supports 8859_1.
|
||
|
*/
|
||
|
|
||
|
public class InputStreamReader extends Reader
|
||
|
{
|
||
|
BufferedInputStream in;
|
||
|
|
||
|
// Buffer of chars read from in and converted but not consumed.
|
||
|
char[] work;
|
||
|
// Next available character (in work buffer) to read.
|
||
|
int wpos;
|
||
|
// Last available character (in work buffer) to read.
|
||
|
int wcount;
|
||
|
|
||
|
BytesToUnicode converter;
|
||
|
|
||
|
public InputStreamReader(InputStream in)
|
||
|
{
|
||
|
this(in, BytesToUnicode.getDefaultDecoder());
|
||
|
}
|
||
|
|
||
|
public InputStreamReader(InputStream in, String enc)
|
||
|
throws UnsupportedEncodingException
|
||
|
{
|
||
|
this(in, BytesToUnicode.getDecoder(enc));
|
||
|
}
|
||
|
|
||
|
private InputStreamReader(InputStream in, BytesToUnicode decoder)
|
||
|
{
|
||
|
super(in);
|
||
|
this.in = in instanceof BufferedInputStream ? (BufferedInputStream) in
|
||
|
: new BufferedInputStream(in, 250);
|
||
|
converter = decoder;
|
||
|
converter.setInput(this.in.buf, 0, 0);
|
||
|
}
|
||
|
|
||
|
public void close() throws IOException
|
||
|
{
|
||
|
synchronized (lock)
|
||
|
{
|
||
|
if (in != null)
|
||
|
in.close();
|
||
|
in = null;
|
||
|
work = null;
|
||
|
wpos = wcount = 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
public String getEncoding() { return converter.getName(); }
|
||
|
|
||
|
public boolean ready() throws IOException
|
||
|
{
|
||
|
synchronized (lock)
|
||
|
{
|
||
|
if (wpos < wcount)
|
||
|
return true;
|
||
|
if (work == null)
|
||
|
{
|
||
|
work = new char[100];
|
||
|
wpos = 0;
|
||
|
wcount = 0;
|
||
|
}
|
||
|
for (;;)
|
||
|
{
|
||
|
if (in.available() <= 0)
|
||
|
return false;
|
||
|
in.mark(1);
|
||
|
int b = in.read();
|
||
|
if (b < 0)
|
||
|
return true;
|
||
|
in.reset();
|
||
|
converter.setInput(in.buf, in.pos, in.count);
|
||
|
wpos = 0;
|
||
|
wcount = converter.read(work, 0, work.length);
|
||
|
in.skip(converter.inpos - in.pos);
|
||
|
if (wcount > 0)
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
public int read(char buf[], int offset, int length) throws IOException
|
||
|
{
|
||
|
synchronized (lock)
|
||
|
{
|
||
|
int wavail = wcount - wpos;
|
||
|
if (wavail > 0)
|
||
|
{
|
||
|
if (length > wavail)
|
||
|
length = wavail;
|
||
|
System.arraycopy(work, wpos, buf, offset, length);
|
||
|
wpos += length;
|
||
|
return length;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
for (;;)
|
||
|
{
|
||
|
in.mark(1);
|
||
|
int b = in.read();
|
||
|
if (b < 0)
|
||
|
return -1;
|
||
|
in.reset();
|
||
|
converter.setInput(in.buf, in.pos, in.count);
|
||
|
int count = converter.read (buf, offset, length);
|
||
|
in.skip(converter.inpos - in.pos);
|
||
|
if (count > 0)
|
||
|
return count;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
public int read() throws IOException
|
||
|
{
|
||
|
synchronized (lock)
|
||
|
{
|
||
|
int wavail = wcount - wpos;
|
||
|
if (wavail > 0)
|
||
|
return work[wpos++];
|
||
|
if (work == null)
|
||
|
{
|
||
|
work = new char[100];
|
||
|
wpos = 0;
|
||
|
wcount = 0;
|
||
|
}
|
||
|
int count = read(work, wpos, work.length-wpos);
|
||
|
if (count <= 0)
|
||
|
return -1;
|
||
|
wcount = wpos + count;
|
||
|
return work[wpos++];
|
||
|
}
|
||
|
}
|
||
|
}
|