xreaderinputstream.java

来自「java写的浏览器」· Java 代码 · 共 69 行

/****************************************************************
*              XBrowser  -  eXtended web Browser                *
*                                                               *
*           Copyright (c) 2000-2001  Armond Avanes              *
*     Refer to ReadMe & License files for more information      *
*                                                               *
*                                                               *
*                    By: Brian Harrington                       *
*                       [e-mail]                         *
*                http://xbrowser.sourceforge.net/               *
*****************************************************************/
package xbrowser.renderer.custom;

import java.io.*;
import sun.io.*;

/**
 * This class acts as a bridge to convert from a reader object
 * to an input stream. It is the exact opposite of the input
 * stream reader class in the jdk.
 *
 * @author  Brian Harrington
 * @version 1.0
 **/
public class XReaderInputStream extends InputStream
{
	/**
	 * Create a new reader input stream.
	 **/
	public XReaderInputStream(Reader in)
	{
		this.in=in;
		cbuffer=new char[1024];
		bbuffer=new byte[4096];
		ctb=CharToByteConverter.getDefault();
		length=0;
		read=0;
	}

	/**
	 * Read one byte from reader.
	 **/
	public int read() throws IOException
	{
		// Check if need to get more
		if(length-read==0)
		{
			length=in.read(cbuffer);
			if(length==-1)
				return -1;
			length=ctb.convertAny(cbuffer, 0, length, bbuffer, 0, bbuffer.length);
			read=0;
		}

		// Get one byte
		return bbuffer[read++];
	}

// Attributes:
	protected Reader in; // Reader object

	// Buffer for characters
	protected char[] cbuffer;
	protected byte[] bbuffer;
	protected int length;
	protected int read;

	protected CharToByteConverter ctb; // Char to byte converter
}