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/*
* QPInputStream.java
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU JavaMail, a library.
*
* GNU JavaMail is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU JavaMail is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
/*
* QPInputStream.java
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU JavaMail, a library.
*
* GNU JavaMail is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU JavaMail is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package gnu.mail.util;
import java.io.*;
/**
* A Quoted-Printable decoder stream.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
*/
public class QPInputStream
extends FilterInputStream
{
protected byte[] buf;
/**
* The number of times read() will return a space.
*/
protected int spaceCount;
private static final int LF = 10;
private static final int CR = 13;
private static final int SPACE = 32;
private static final int EQ = 61;
/**
* Constructor.
* @param in the underlying input stream.
*/
public QPInputStream(InputStream in)
{
super(new PushbackInputStream(in, 2));
buf = new byte[2];
}
/**
* Read a character from the stream.
*/
public int read()
throws IOException
{
if (spaceCount>0)
{
spaceCount--;
return SPACE;
}
int c = in.read();
if (c==SPACE)
{
while ((c = in.read())==SPACE)
spaceCount++;
if (c==LF || c==CR || c==-1)
spaceCount = 0;
else
{
((PushbackInputStream)in).unread(c);
c = SPACE;
}
return c;
}
if (c==EQ)
{
int c2 = super.in.read();
if (c2==LF)
return read();
if (c2==CR)
{
int peek = in.read();
if (peek!=LF)
((PushbackInputStream)in).unread(peek);
return read();
}
if (c2==-1)
return c2;
buf[0] = (byte)c2;
buf[1] = (byte)in.read();
try
{
return Integer.parseInt(new String(buf, 0, 2), 16);
}
catch (NumberFormatException e)
{
((PushbackInputStream)in).unread(buf);
}
return c;
}
else
return c;
}
/**
* Reads from the underlying stream into the specified byte array.
*/
public int read(byte[] bytes, int off, int len)
throws IOException
{
int pos = 0;
try
{
while (pos<len)
{
int c = read();
if (c==-1)
{
if (pos==0)
pos = -1;
break;
}
bytes[off+pos] = (byte)c;
pos++;
}
}
catch (IOException e)
{
pos = -1;
}
return pos;
}
/**
* Mark is not supported.
*/
public boolean markSupported()
{
return false;
}
/**
* Returns the number of bytes that can be read without blocking.
*/
public int available()
throws IOException
{
return in.available();
}
}
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