url.h

开源代码的pwlib的1.10.0版本,使用openh323的1.18.0版本毕备

/*
 * url.h
 *
 * Universal Resource Locator (for HTTP/HTML) class.
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-2002 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: url.h,v $
 * Revision 1.34  2005/11/30 12:47:37  csoutheren
 * Removed tabs, reformatted some code, and changed tags for Doxygen
 *
 * Revision 1.33  2005/04/20 05:19:48  csoutheren
 * Patch 1185334. Ensure SIP URLs correctly store status of port
 * Thanks to Ted Szoczei
 *
 * Revision 1.32  2005/01/04 07:44:02  csoutheren
 * More changes to implement the new configuration methodology, and also to
 * attack the global static problem
 *
 * Revision 1.31  2004/12/08 00:51:11  csoutheren
 * Move PURLLegacyScheme to header file to allow external usage
 *
 * Revision 1.30  2004/11/11 07:34:50  csoutheren
 * Added #include <ptlib.h>
 *
 * Revision 1.29  2004/07/07 07:18:43  csoutheren
 * Removed warnings on Linux from Windows static global hacks
 *
 * Revision 1.28  2004/07/06 10:12:51  csoutheren
 * Added static integer o factory template to assist in ensuring factories are instantiated
 *
 * Revision 1.27  2004/06/01 07:32:45  csoutheren
 * Removed warning on Linux
 *
 * Revision 1.26  2004/06/01 07:28:44  csoutheren
 * Changed URL parsing to use abstract factory code
 *
 * Revision 1.25  2004/03/13 06:30:52  rjongbloed
 * Virtualised parse function.
 *
 * Revision 1.24  2003/04/04 05:18:08  robertj
 * Added "callto", "tel" and fixed "h323" URL types.
 *
 * Revision 1.23  2002/12/10 04:40:34  robertj
 * Added test function for URL being empty.
 *
 * Revision 1.22  2002/11/20 00:50:09  robertj
 * Fixed correct interpretation of url re double slashes as per latest RFC,
 *   including file: mapping and relative paths. Probably still more to do.
 *
 * Revision 1.21  2002/11/19 10:36:08  robertj
 * Added functions to set anf get "file:" URL. as PFilePath and do the right
 *   things with platform dependent directory components.
 *
 * Revision 1.20  2002/11/06 22:47:24  robertj
 * Fixed header comment (copyright etc)
 *
 * Revision 1.19  2002/09/16 01:08:59  robertj
 * Added #define so can select if #pragma interface/implementation is used on
 *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
 *
 * Revision 1.18  2002/03/18 05:01:54  robertj
 * Added functions to set component parts of URL.
 *
 * Revision 1.17  2001/11/08 00:32:49  robertj
 * Added parsing of ';' based parameter fields into string dictionary if there are multiple parameters, with '=' values.
 *
 * Revision 1.16  2001/09/28 00:32:24  robertj
 * Broke out internal static function for unstranslating URL strings.
 *
 * Revision 1.15  1999/03/09 08:01:47  robertj
 * Changed comments for doc++ support (more to come).
 *
 * Revision 1.14  1999/02/16 08:07:10  robertj
 * MSVC 6.0 compatibility changes.
 *
 * Revision 1.13  1998/09/23 06:20:11  robertj
 * Added open source copyright license.
 *
 * Revision 1.12  1998/02/16 00:12:53  robertj
 * Added function to open a URL in a browser.
 *
 * Revision 1.11  1998/02/03 10:02:35  robertj
 * Added ability to get scheme, host and port from URL as a string.
 *
 * Revision 1.10  1998/02/03 06:18:49  robertj
 * Fixed URL encoding to be closer to RFC
 *
 * Revision 1.9  1997/01/12 04:22:54  robertj
 * Added has function so URL can be dictionary key.
 *
 * Revision 1.8  1996/08/19 13:37:28  robertj
 * Fixed URL parsing and definition (cannot have relative paths).
 *
 * Revision 1.7  1996/06/10 09:55:44  robertj
 * Added global function for query parameters parsing.
 *
 * Revision 1.6  1996/03/31 08:53:13  robertj
 * Added string representation for URI part only.
 *
 * Revision 1.5  1996/03/16 04:46:02  robertj
 * Added translation type to TranslateString() to accommodate query variables.
 *
 * Revision 1.4  1996/03/02 03:12:13  robertj
 * Added function to translate a string to a form suitable for inclusion in a URL.
 *
 * Revision 1.3  1996/02/03 11:06:27  robertj
 * Added splitting of query field into variables dictionary.
 *
 * Revision 1.2  1996/01/26 02:24:32  robertj
 * Further implemetation.
 *
 * Revision 1.1  1996/01/23 13:04:20  robertj
 * Initial revision
 *
 */

#ifndef _PURL
#define _PURL

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include <ptlib.h>


//////////////////////////////////////////////////////////////////////////////
// PURL

class PURLLegacyScheme;

/**
 This class describes a Universal Resource Locator.
 This is the desciption of a resource location as used by the World Wide
 Web and the #PHTTPSocket# class.
 */
class PURL : public PObject
{
  PCLASSINFO(PURL, PObject)
  public:
    /**Construct a new URL object from the URL string. */
    PURL();
    /**Construct a new URL object from the URL string. */
    PURL(
      const char * cstr,    ///< C string representation of the URL.
      const char * defaultScheme = NULL ///< Default scheme for URL
    );
    /**Construct a new URL object from the URL string. */
    PURL(
      const PString & str,  ///< String representation of the URL.
      const char * defaultScheme = NULL ///< Default scheme for URL
    );
    /**Construct a new URL object from the file path. */
    PURL(
      const PFilePath & path   ///< File path to turn into a "file:" URL.
    );

  /**@name Overrides from class PObject */
  //@{
    /**Compare the two URLs and return their relative rank.

     @return
       #LessThan#, #EqualTo# or #GreaterThan#
       according to the relative rank of the objects.
     */
    virtual Comparison Compare(
      const PObject & obj   ///< Object to compare against.
    ) const;

    /**This function yields a hash value required by the #PDictionary#
       class. A descendent class that is required to be the key of a dictionary
       should override this function. The precise values returned is dependent
       on the semantics of the class. For example, the #PString# class
       overrides it to provide a hash function for distinguishing text strings.

       The default behaviour is to return the value zero.

       @return
       hash function value for class instance.
     */
    virtual PINDEX HashFunction() const;

    /**Output the contents of the URL to the stream as a string.
     */
    virtual void PrintOn(
      ostream &strm   ///< Stream to print the object into.
    ) const;

    /**Input the contents of the URL from the stream. The input is a URL in
       string form.
     */
    virtual void ReadFrom(
      istream &strm   ///< Stream to read the objects contents from.
    );
  //@}
 
  /**@name New functions for class. */
  //@{
    /**Parse the URL string into the fields in the object instance. */
    inline BOOL Parse(
      const char * cstr,   ///< URL as a string to parse.
      const char * defaultScheme = NULL ///< Default scheme for URL
    ) { return InternalParse(cstr, defaultScheme); }
    /**Parse the URL string into the fields in the object instance. */
    inline BOOL Parse(
      const PString & str, ///< URL as a string to parse.
      const char * defaultScheme = NULL ///< Default scheme for URL
    ) { return InternalParse((const char *)str, defaultScheme); }

    /**Print/String output representation formats. */
    enum UrlFormat {
      /// Translate to a string as a full URL
      FullURL,