/** * JWAP - A Java Implementation of the WAP Protocols * Copyright (C) 2001-2004 Niko Bender * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser 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 */package net.sourceforge.jwap.wsp.pdu;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.util.Date;import java.util.Enumeration;import java.util.Vector;import net.sourceforge.jwap.util.Logger;import net.sourceforge.jwap.util.Utils;import net.sourceforge.jwap.wsp.WSPDecoder;import net.sourceforge.jwap.wsp.header.CodePage;import net.sourceforge.jwap.wsp.header.Header;import net.sourceforge.jwap.wsp.header.HeaderParseException;import net.sourceforge.jwap.wsp.header.WAPCodePage;/** * This class represents WSP Headers * * @author Michel Marti */public class CWSPHeaders{    private static Logger logger = Logger.getLogger(CWSPHeaders.class);    // List of Headers    private Vector headers = new Vector();    // Default codepage (WAP)    private CodePage codePage;    /**     * Construct WSP Headers using the default WAP codepage     */    public CWSPHeaders() {        this(WAPCodePage.getInstance());    }    /**     * Construct WSP Headers using a specific codepage     */    public CWSPHeaders(CodePage codePage) {        this.codePage = codePage;    }    /**     * Construct WSP Headers by decoding a byte array     * @param decoder the WSPDecoder for decoding     * @param count the length of the headers within the data     * @param codePage the codepage for decoding the headers     * @throws HeaderParseException if decoding fails     */    public CWSPHeaders(WSPDecoder decoder, int length, CodePage codePage)        throws HeaderParseException    {        this(decoder,length, null, codePage);    }    /**     * Construct WSP Headers by decoding a byte array.     * @param decoder the WSPDecoder for decoding     * @param count the length of the headers within the data     * @param stopOn the header after which decoding stops (may be null)     * @param codePage the codepage for decoding the headers     * @throws HeaderParseException if decoding fails     */    public CWSPHeaders(WSPDecoder decoder, int length, String stopOn, CodePage codePage)        throws HeaderParseException    {        this(codePage);        if( decoder == null ) {            return;        }        if(decoder.getRemainingOctets() < length ) {            logger.warn(length+": Length exceeds remaining octets in decoder");            length = decoder.getRemainingOctets();        }        if(logger.isDebugEnabled()) {            int pos = decoder.seek(0);            byte[] bytes = decoder.getBytes(length);            decoder.pos(pos);            logger.debug("\n"+Utils.hexDump("data to decode: ", bytes));        }        if(stopOn!=null) {            stopOn=stopOn.toLowerCase();        }        try {            Header header;            int offset = decoder.seek(0);            while(decoder.seek(0) < (offset+length) ) {                int start = decoder.seek(0);                int octet = decoder.getUint8();                int hlen = 0;				// logger.debug("1st octet: "+Integer.toHexString(octet));                if (octet == 127) { // Shift-Delimiter                    // shift-delimiter + page identity                    int pageIdentity = decoder.getUint8();                    if( logger.isDebugEnabled()) {                        logger.debug("Shift-delimiter detected, page identity: "+ pageIdentity);                    }                    if (pageIdentity != 1) {                        throw new HeaderParseException(                            "Code page switching not supported. (page identity: " +                            pageIdentity + ")");                    }                    // ignore code page switching to default code page                } else if( octet > 0 && octet <= 31 ) { // Short-cut-shift-delimiter                    int shortCut = octet;                    if(logger.isDebugEnabled()) {                        logger.debug("Short-cut-shift-delimiter detected, page identity: "+shortCut);                    }                    if (shortCut != 1) {                        throw new HeaderParseException(                            "Code page switching not supported. (short-cut-shift-delimiter: " +                            shortCut + ")");                    }                    // ignore code page switching to default code page                } else {                    // message header                    if ((octet & 0x80) == 0x80) { // short-integer                        //logger.debug("Well-Known-header detected");                        // well-known-field-name + wap-value                        int wellKnownHeader = octet & 0x7F;                        // header value                        hlen = getHeaderValueSize(decoder);                        hlen++; // We want the first octet as-well                    } // well-known-field-name + wap-value                    else {                        //logger.debug("Application-header detected");                        decoder.seek(-1);                        // application header -> header name as string and value as string                        // header name                        hlen = getHeaderValueSize(decoder);                        decoder.seek(hlen);                        // value                        hlen+= getHeaderValueSize(decoder);                    }                    decoder.pos(start);                    byte[] encodedHeader = decoder.getBytes(hlen);                    if(logger.isDebugEnabled()) {                        logger.debug("\n"+Utils.hexDump("encoded header: ", encodedHeader));                    }                    try {                        header = codePage.decode(encodedHeader);                        if (header != null) {                            if (logger.isDebugEnabled()) {                                logger.debug("Decoded header: " + header);                            }                            headers.addElement(header);                            if( stopOn != null && header.getName().toLowerCase().equals(stopOn) ) {                                if(logger.isDebugEnabled()) {                                    logger.debug(stopOn+": stop-on header reached, decode done");                                }                                break;                            }                        } else {                            logger.warn(                                "CodePage.decode() returned a null header: \n" +                                Utils.hexDump(encodedHeader));                        }                    } catch (Exception unknown) {                        // Since header parsing is not yet complete, warn and go-ahead                        logger.warn("Exception while decoding header", unknown);                        if (logger.isDebugEnabled()) {                            logger.debug(Utils.hexDump(encodedHeader));                        }                    }                }                 // message header            }        } catch (IndexOutOfBoundsException e) {            // ignore and return        }    }    /**     * Sets a WSP header with the given name and value. If the header had     * already been set, the new value overwrites the previous one. The containsHeader     * method can be used to test for the presence of a header before setting its value.     */    public void setHeader(String name, String value) {        if (name == null) {            return;        }        removeHeader(name);        if (value != null) {            headers.addElement(new Header(name, value));        }    }    public void addHeader(String name, String value) {        if ((name == null) || (value == null)) {            return;        }        headers.addElement(new Header(name, value));    }    /**     * Sets a WSP header with the given name and integer value. If the header     * had already been set, the new value overwrites the previous one. The     * containsHeader  method can be used to test for the presence of a header