package Serfler;

//    Serfler - an Http server written in Java based on servlets
//    Copyright (c) 1998 by Douglas Harris <doug@mscs.mu.edu>
//    Distributed under the GNU General Public License
//    <http://www.fsf.org/coopyleft/gpl.html>
//    A copy is included with this software distribution.
//    The package is available from
//    http://spectral.mscs.mu.edu/javadev/src/serfler.zip
//    

import java.io.*;
import javax.servlet.*;

public class SerflerInputStream extends ServletInputStream{
    protected PushbackInputStream i;

    public SerflerInputStream(InputStream i){
       this.i=new PushbackInputStream(i);
    }
    public int read() throws IOException{
      return i.read();
    }

    public int read(byte b[]) throws IOException {
	return i.read(b, 0, b.length);
    }

    public int read(byte b[], int off, int len) throws IOException {
	return i.read(b, off, len);
    }

    public long skip(long n) throws IOException {
	return i.skip(n);
    }

    public int available() throws IOException {
	return i.available();
    }

    public void close() throws IOException {
      i.close();
    }

    public synchronized void mark(int readlimit) {
      i.mark(readlimit);
    }

    public synchronized void reset() throws IOException {
	i.reset();
    }

    public boolean markSupported() {
	return i.markSupported();
    }

    /**
     * Reads into an array of bytes until all requested bytes have been
     * read or a '\n' is encountered, in which case the '\n' is read into
     * the array as well.
     * @param b the buffer where data is stored
     * @param off the start offset of the data
     * @param len the length of the data
     * @return the actual number of bytes read, or -1 if the end of the
     *         stream is reached
     * @exception IOException if an I/O error has occurred
     */
  public int readLine(byte[] b, int off, int len) throws IOException{
    int ch;
    int n=0;
    if (len==0){
      return len;
    }
    while (-1!=(ch=i.read())){
      b[off+(n++)]=(byte)ch;
      if((n==len)||(ch==10)){
	return n;
      }
    }
    return ch;
  }

    /**
     * Read bytes until CR, LF, or CRLF has been read.
     * Note LFCR will return an empty String this time
     * and next time this routine is run.
     * @return the bytes read converted to a String
     * @exception IOException if an I/O error has occurred
     */
  public String readLine() throws IOException{
    StringBuffer s=new StringBuffer(1024);
    boolean seenCR=false;
    int ch;
    while(-1!=(ch=i.read())){
      if(ch==10){break;}
      if (seenCR){i.unread(ch);break;}
      if (ch==13){seenCR=true;continue;}
      s.append((char)ch);
    }
    return s.toString();
  }
}