wbxmlutility.java

一个用 java写的wap浏览器 对于浏览器感兴趣起的可以看看咯

/*
 * j2wap is distributed under the terms of the GNU Public License
 *
 *  j2wap was written by:
 *
 *	        Scott Campbell
 *			Michael Nordling
 *			Karl Maftoum
 * 			Julian Bright
 *
 *			This was a final project for Comp.Engineering at the University of Canberra, Australia
 *
 *			Now released as Open Source software. 28 November 2000
 *
 *			Email: [e-mail] for more info
 *
 *			Use entirely at your own risk.
 */
package wae;

import java.io.IOException;
import java.io.ByteArrayInputStream;

/**
 * Title:       WbxmlUtility
 * Description:	This class encapsulates functionality to manipulate
 *              WBXML bytecode.
 * Company:     J2wap.com
 * @author      Scott Campbell
 * @version     1.1
 */
public class WbxmlUtility
{
 // Public Attributes
 /** Low byte mask. */
 public static final int c_LowByteMask = 0x7f;

  /**
   * Dtermines if an identifier has content following it.
   * An identifier has content if the second most significant bit
   * in the byte is '1'.
   * @param   in_intValue The byte that represents a WML token.
   * @return  True if the identifier has the bit set that flags content.
   */
  public boolean hasContent (int in_intValue) throws IOException
  {
    return ((in_intValue & 0x40) != 0);
  } // hasContent

  /**
   * Determine if an identifier has attributes.
   * An identifier has attributes if the msb in the
   * byte is '1'.
   * @param   in_intValue The byte that represents a WML token.
   * @return  True if the identifier has the bit set that flags attributes.
   */
  public boolean hasAttributes (int in_intValue) throws IOException
  {
    return ((in_intValue & 0x80) != 0);
  } // hasAttributes

  /**
   * Determines if there are more octets in the multi-byte
   * integer. The most significant bit in each octet is the
   * "continuation bit". The final octet in the series has
   * it's "continuation bit" set to '0'.
   * @param   in_intValue The byte that represents a WML token.
   * @return  True if there are more octets in the multi-byte
   *          integer.
   */
  public boolean moreBytesInMBInt (int in_intValue) throws IOException
  {
    return ((in_intValue & 0x80) != 0);
  } // moreBytesInMBInt

  /**
   * Determines if the string is part of an attribute value string.
   * @param   in_intValue The byte that represents a WML token.
   * @return  True if the string is part of an attribute value string.
   */
  public boolean isAttributeValueString (int in_intValue) throws IOException
  {
    return ((in_intValue & 0x80) != 0);
  } // isAttributeValueString

} // WbxmlUtility