netlayer.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.
 */


 /*
	This is the UDP NetLayer for j2wap
	Original Version
	GPL 20/8/00 Karl Maftoum
*/


/* Revision History

Version 0.0.1  20/8/00

Version 0.0.2   24/8/00

* Massive code cleanup
* Setup gateway and URI strings
* Working Content (Finally)

Version 0.0.3  27/8/00

* POST code added

Version 0.0.4 4/9/00

* Implementing Timeout
* All encoding accept bytes etc now work
* commented out Accept wbmp (not implemented yet)

Version 0.0.5  7/9/00

* Total re-write to implement POST & GET as one function for size
* Works except I can't yet test POST (no sites)
* IP Layer Header Deleted from Byte Array

Version 0.0.6   19/09/00

* Changed to add gc() calls, and less array copies

Version 0.0.7   2/10/00

* Removed debugging System.out.println calls
* Adding threading & exception handling for UI Cancel
* Getting the timeout to work properly

Version 0.0.8 	6/10/00

* Fix the http:// substitution to work correctly
* Removed excessive gc() calls
* UI Cancel still doesn't work
* TID Now handled properly

Version 0.0.9 	 17/11/00

* Fixed all the bits from the Windows port back to Palm
* Got all redirects/timeouts/wierd things working.
* Removed UI Cancel threading, just didn't work properly
* This is the final version I think

Version 0.1.0 	18/11/00

* Removed all debugging code
* Code Styling, and formatting


Version Windows 0.0.1 22/10/00

* Removed all Palm specific stuff

Version Windows 1.1 18/11/00

* Synched Palm & WIN32 Versions.
* See Palm Revision History for more details.


*/

package net;
import java.io.*;
import java.net.*;


/**
 * Title:       NetLayer
 * Description: The NetLayer provdides all of the net services to j2wap
 * Company:     J2wap.com
 * @author      Karl Maftoum
 * @version     1.1
 */


public class NetLayer {
    static int TID = 2;
    String httpsub;
    String FinalURI;
    public wae.CurrentDeck c_clsCurrDeck;
    byte[] rbuf;

    public byte[] doConnection(String gateway, String URI, String type, int oldTID, String Data) {
        boolean bReturn = true;
        ByteArrayOutputStream dg = new ByteArrayOutputStream();
        try {
            int sub = URI.indexOf("http://");
            if(sub == -1) {
                httpsub = "http://";
                FinalURI = httpsub + URI;
            }
            else {
                FinalURI = URI;
            }
            byte plen = (byte)FinalURI.length();
            byte postMsg[] = FinalURI.getBytes();
            /* Begin New (0.0.5) Code */
            /* Trasaction ID Fixed now 0.0.8 */
            TID++;
            dg.write(TID); /* Transaction ID */
            if(type.equals("GET")) {
                dg.write(0x40); /* Indicates GET PDU */
                dg.write(plen);
            }
            if(type.equals("POST")) {
                dg.write(0x60); /* POST PDU */
                dg.write(plen);
            }
            for(int i = 0;i < postMsg.length;i++) {
                dg.write(postMsg[i]);
            }
            postMsg = null;
            if(type.equals("POST")) {
                dg.write(0x92); /* x-form-url-encoded */
            }
            dg.write(0xA9); /* User-Agent */
            /* j2wap blessing code, i.e. HTTP Headers*/
            String eMsg = "j2wap WIN32 1.1:See j2wap.com for details";
            byte epostMsg[] = eMsg.getBytes();
            for(int i = 0;i < epostMsg.length;i++) {
                dg.write(epostMsg[i]);
            }
            epostMsg = null;
            dg.write(0x00); /* Terminate Agent String */
            dg.write(0x80); /* Accept */
            dg.write(0x94); /* application/vnd.wap.wmlc */
            /* UTF 8 - Required */
            dg.write(0x81); /* Accept-Charset */
            dg.write(0xEA); /* UTF 8 */
            /* Standard, Latin-1 Charset */
            dg.write(0x81); /* Accept-Charset */
            dg.write(0x84); /* iso-8859-1 */
            if(type.equals("POST")) {
                byte postData[] = Data.getBytes();
                for(int i = 0;i < postData.length;i++) {
                    dg.write(postData[i]);
                }
                postData = null;
            }
            byte[] buf = dg.toByteArray();
            int length = buf.length;
            InetAddress inet = InetAddress.getByName(gateway);
            DatagramPacket dgp = new DatagramPacket(buf, length, inet, 9200);
            DatagramSocket dgs = new DatagramSocket();
            dgs.send(dgp);
            byte rbuf[] = new byte[1500];
            DatagramPacket dgr = new DatagramPacket(rbuf, 1500);
            dgs.setSoTimeout(15000);
            /* If we receive nothing within 15 seconds, give up */
            try {
                dgs.receive(dgr);
            }
            catch(InterruptedIOException e) {
                byte[] failed =  {
                    /**
                     * <wml>
                     *   <card>
                     *     <p>
                     *       The request has timed out. Please enter a new URL.
                     *     </p>
                     *   </card>
                     * </wml>
                     */
                    (byte)0x0002, (byte)0x0008, (byte)0x006a, (byte)0x0000,
                    (byte)0x0000, (byte)0x007f, (byte)0x00e7, (byte)0x0055,
                    (byte)0x0003, (byte)'T', (byte)'i', (byte)'m', (byte)'e',
                    (byte)'o', (byte)'u', (byte)'t', (byte)0x0000, (byte)0x0001,
                    (byte)0x0060, (byte)0x0003, (byte)'T', (byte)'h', (byte)'e',
                    (byte)' ', (byte)'r', (byte)'e', (byte)'q', (byte)'u',
                    (byte)'e', (byte)'s', (byte)'t', (byte)' ', (byte)'h',
                    (byte)'a', (byte)'s', (byte)' ', (byte)'t', (byte)'i',
                    (byte)'m', (byte)'e', (byte)'d', (byte)' ', (byte)'o',
                    (byte)'u', (byte)'t', (byte)'.', (byte)' ', (byte)'P',
                    (byte)'l', (byte)'e', (byte)'a', (byte)'s', (byte)'e',
                    (byte)' ', (byte)'e', (byte)'n', (byte)'t', (byte)'e',
                    (byte)'r', (byte)' ', (byte)'a', (byte)' ', (byte)'n',
                    (byte)'e', (byte)'w', (byte)' ', (byte)'U', (byte)'R',
                    (byte)'L', (byte)'.', (byte)0x0000, (byte)0x0001, (byte)0x0001,
                    (byte)0x0001
                };
                return failed;
            }
            /* Timeout implmented by throwing exception*/


            byte b[] = new byte[dgr.getLength()];
            b = dgr.getData();
            int q = 0;
            byte c[] = new byte[1500];
            /* Byte 45 is len */
            int skip;
            skip = ((int)b[3]);
            if(skip < 0) {
                /* Multi-Byte crap */
                byte multiPt1 = b[3];
                byte multiPt2 = b[4];
                byte finalMult;
                int tmp1;
                int tmp2;
                tmp1 = (int)b[3] + 255;
                tmp1 += 1;
                tmp2 = (int)multiPt2;
                skip = tmp1 + tmp2;
            }
            skip += 4;
            System.arraycopy(b, skip, c, 0, (b.length - (skip)));
            /* Code to check for HTTP redirects */

            int httpstart = 0;
            int semaphore = 0;
            int httpend = 0;
            int count = 0;
            int highpoint = c.length;
 			int WMLhighpoint = c.length;
			boolean NoWML = true;
 			if(c.length > 255) {
                highpoint = 255;
            }
            if(c.length < 255) {
                highpoint = c.length;
            }



            for(count = 0;count < highpoint;count++) {
                if(b[count] == 0xffffff9C) {
                    if(b[count + 1] == 0x68) {
                        if(b[count + 2] == 0x74) {
                            /* We've hit a redirect */
                            httpstart = count;
                            semaphore = 1;
                            break;
                        }
                    }
                }
            }
            if(semaphore > 0) {
                for(count = httpstart;count < 255;count++) {
                    if(b[count] == 0x00) {
                        if(b[count + 1] == 0xffffff9c) {

                        }
                        if(b[count + 1] != 0xffffff9C) {
                             /* This is the end of the redirect */
                             {
                                httpend = count;
                                break;
                            }
                        }
                    }
                }
                int count2;
                String temp;
                if(httpstart > 0) {
                    byte[] newURL = new byte[httpend - httpstart - 1];
                    System.arraycopy(b, httpstart + 1, newURL, 0, httpend - httpstart - 1);
                    String bufURL = new String(newURL);
                    StringBuffer tempURL = new StringBuffer(bufURL);
                    if(semaphore > 0) {
                        for(count2 = 0;count2 < tempURL.length();count2++) {
                            if(tempURL.charAt(count2) == 0x00) {
                                tempURL.deleteCharAt(count2);
                            }
                            if(tempURL.charAt(count2) == '