TGHtmlUri.cxx

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// $Id$
// Author:  Valeriy Onuchin   03/05/2007
 
/*************************************************************************
 * Copyright (C) 1995-2001, Rene Brun, Fons Rademakers and Reiner Rohlfs *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
/**************************************************************************
 
    HTML widget for xclass. Based on tkhtml 1.28
    Copyright (C) 1997-2000 D. Richard Hipp <drh@acm.org>
    Copyright (C) 2002-2003 Hector Peraza.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
**************************************************************************/
 
// Routines for processing URLs.
 
#include <ctype.h>
#include <cstring>
#include <cstdlib>
 
#include "TGHtml.h"
#include "TGHtmlUri.h"
#include "strlcpy.h"
 
static char *StrNDup(const char *z, int n);
static void ReplaceStr(char **pzDest, const char *zSrc);
#if 0  // not used
static char *Trim(char *z);
#endif
 
 
////////////////////////////////////////////////////////////////////////////////
/// Parse a text URI into an HtmlUri structure.
 
TGHtmlUri::TGHtmlUri(const char *zUri)
{
   int n;
 
   fZScheme = fZAuthority = fZPath = fZQuery = fZFragment = nullptr;
 
   if (zUri && *zUri) {
      while (isspace(*zUri)) ++zUri;
      n = ComponentLength(zUri, "", ":/?# ");
      if (n > 0 && zUri[n] == ':') {
         fZScheme = StrNDup(zUri, n);
         zUri += n+1;
      }
      n = ComponentLength(zUri, "//", "/?# ");
      if (n > 0) {
         fZAuthority = StrNDup(&zUri[2], n-2);
         zUri += n;
      }
      n = ComponentLength(zUri, "", "?# ");
      if (n > 0) {
         fZPath = StrNDup(zUri, n);
         zUri += n;
      }
      n = ComponentLength(zUri, "?", "# ");
      if (n > 0) {
         fZQuery = StrNDup(&zUri[1], n-1);
         zUri += n;
      }
      n = ComponentLength(zUri, "#", " ");
      if (n > 0) {
         fZFragment = StrNDup(&zUri[1], n-1);
      }
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Html uri copy constructor.
 
TGHtmlUri::TGHtmlUri(const TGHtmlUri *uri)
{
   fZScheme = fZAuthority = fZPath = fZQuery = fZFragment = nullptr;
 
   if (uri) {
      if (uri->fZScheme)    fZScheme    = StrDup(uri->fZScheme);
      if (uri->fZAuthority) fZAuthority = StrDup(uri->fZAuthority);
      if (uri->fZPath)      fZPath      = StrDup(uri->fZPath);
      if (uri->fZQuery)     fZQuery     = StrDup(uri->fZQuery);
      if (uri->fZFragment)  fZFragment  = StrDup(uri->fZFragment);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Html uri destructor.
 
TGHtmlUri::~TGHtmlUri()
{
   if (fZScheme) delete[] fZScheme;
   if (fZAuthority) delete[] fZAuthority;
   if (fZPath) delete[] fZPath;
   if (fZQuery) delete[] fZQuery;
   if (fZFragment) delete[] fZFragment;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compare another uri with given field mask.
 
int TGHtmlUri::EqualsUri(const TGHtmlUri *uri, int field_mask)
{
   if (!uri) return 0;
 
   if (field_mask & URI_SCHEME_MASK) {
      if (uri->fZScheme && fZScheme) {
         if (strcmp(uri->fZScheme, fZScheme) != 0) return 0;
      } else if (uri->fZScheme != fZScheme) {  // one of them null?
         return 0;
      }
   }
 
   if (field_mask & URI_AUTH_MASK) {
      if (uri->fZAuthority && fZAuthority) {
         if (strcmp(uri->fZAuthority, fZAuthority) != 0) return 0;
      } else if (uri->fZAuthority != fZAuthority) {
         return 0;
      }
   }
 
   if (field_mask & URI_PATH_MASK) {
      if (uri->fZPath && fZPath) {
         if (strcmp(uri->fZPath, fZPath) != 0) return 0;
      } else if (uri->fZPath != fZPath) {
         return 0;
      }
   }
 
   if (field_mask & URI_QUERY_MASK) {
      if (uri->fZQuery && fZQuery) {
         if (strcmp(uri->fZQuery, fZQuery) != 0) return 0;
      } else if (uri->fZQuery != fZQuery) {
         return 0;
      }
   }
 
   if (field_mask & URI_FRAGMENT_MASK) {
      if (uri->fZFragment && fZFragment) {
         if (strcmp(uri->fZFragment, fZFragment) != 0) return 0;
      } else if (uri->fZFragment != fZFragment) {
         return 0;
      }
   }
 
   return 1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the length of the next component of the URL in z[] given
/// that the component starts at z[0].  The initial sequence of the
/// component must be zInit[].  The component is terminated by any
/// character in zTerm[].  The length returned is 0 if the component
/// doesn't exist.  The length includes the zInit[] string, but not
/// the termination character.
///
///        Component        zInit      zTerm
///        ----------       -------    -------
///        scheme           ""         ":/?#"
///        authority        "//"       "/?#"
///        path             "/"        "?#"
///        query            "?"        "#"
///        fragment         "#"        ""
 
int TGHtmlUri::ComponentLength(const char *z, const char *zInit, const char *zTerm)
{
   int i, n;
 
   for (n = 0; zInit[n]; ++n) {
      if (zInit[n] != z[n]) return 0;
   }
   while (z[n]) {
      for (i = 0; zTerm[i]; ++i) {
         if (z[n] == zTerm[i]) return n;
      }
      ++n;
   }
 
   return n;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create a string to hold the given URI. Memory to hold the string is
/// allocated with new[] and must be freed by the calling function.
 
char *TGHtmlUri::BuildUri()
{
   TString uri;
 
   if (fZScheme)
      uri.Append(TString::Format("%s:", fZScheme));
 
   if (fZAuthority)
      uri.Append(TString::Format("//%s", fZAuthority));
 
   if (fZAuthority && fZAuthority[strlen(fZAuthority)-1] != '/' &&
         !(fZPath && fZPath[0] == '/'))
      uri.Append("/");
 
   if (fZPath)
      uri.Append(fZPath);
 
   if (fZQuery)
      uri.Append(TString::Format("?%s", fZQuery));
 
   if (fZFragment)
      uri.Append(TString::Format("#%s", fZFragment));
 
   return StrDup(uri.Data());
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Duplicate a string of length n.
 
static char *StrNDup(const char *z, int n)
{
   char *zResult;
 
   if (n <= 0) n = strlen(z);
   zResult = new char[n + 1];
   if (zResult) {
      memcpy(zResult, z, n);
      zResult[n] = 0;
   }
   return zResult;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Replace the string in *pzDest with the string in zSrc
 
static void ReplaceStr(char **pzDest, const char *zSrc)
{
   if (*pzDest != 0) delete[] *pzDest;
   if (zSrc == 0) {
      *pzDest = 0;
   } else {
      *pzDest = StrNDup(zSrc, -1);
   }
}
 
#if 0  // not used
static char *Trim(char *z)
{
   // Remove leading and trailing spaces from the given string. Return
   // a new string allocated with new[].
   int i;
   char *zNew;
 
   while (isspace(*z)) z++;
   i = strlen(z);
   zNew = new char[i + 1];
   if (zNew == 0) return 0;
   strcpy(zNew, z);
   while (i > 0 && isspace(zNew[i-1])) zNew[--i] = 0;
 
   return zNew;
}
#endif
 
////////////////////////////////////////////////////////////////////////////////
/// This function resolves the specified URI and returns the result in
/// a newly allocated string. The resolver algorithm specified in section
/// 5.2 of RFC 2396 is used.
 
char *TGHtml::ResolveUri(const char *zUri)
{
   char *result = 0;
   TGHtmlUri *base, *term;
 
   if (zUri == 0 || *zUri == 0) return 0;
 
   if (fZBaseHref && *fZBaseHref) {
      base = new TGHtmlUri(fZBaseHref);
   } else {
      base = new TGHtmlUri(fZBase);
   }
 
   term = new TGHtmlUri(zUri);
 
   if (term->fZScheme == 0 &&
       term->fZAuthority == 0 &&
       term->fZPath == 0 &&
       term->fZQuery == 0 &&
       term->fZFragment) {
      ReplaceStr(&base->fZFragment, term->fZFragment);
   } else if (term->fZScheme) {
      TGHtmlUri *temp;
      temp = term;
      term = base;
      base = temp;
   } else if (term->fZAuthority) {
      ReplaceStr(&base->fZAuthority, term->fZAuthority);
      ReplaceStr(&base->fZPath, term->fZPath);
      ReplaceStr(&base->fZQuery, term->fZQuery);
      ReplaceStr(&base->fZFragment, term->fZFragment);
   } else if (term->fZPath && (term->fZPath[0] == '/' || base->fZPath == 0)) {
      ReplaceStr(&base->fZPath, term->fZPath);
      ReplaceStr(&base->fZQuery, term->fZQuery);
      ReplaceStr(&base->fZFragment, term->fZFragment);
   } else if (term->fZPath && base->fZPath) {
      TString pathTmp;
      pathTmp += base->fZPath;
      pathTmp += term->fZPath;
      int i, j, zBufSz = pathTmp.Length() + 2;
      pathTmp.ReplaceAll("/./", "/"); // replace redundant "/./"
      char *zBuf = new char[zBufSz];
      if (zBuf) {
         for (i = 0; zBuf[i]; i++) {
            if (zBuf[i] == '/' && zBuf[i+1] == '.' && zBuf[i+2] == 0) {
               zBuf[i+1] = 0;
               continue;
            }
            if (i > 0 && zBuf[i] == '/' && zBuf[i+1] == '.' &&
                zBuf[i+2] == '.' && (zBuf[i+3] == '/' || zBuf[i+3] == 0)) {
               for (j = i - 1; j >= 0 && zBuf[j] != '/'; --j) {}
               if (zBuf[i+3]) {
                  // coverity[secure_coding]
                  strcpy(&zBuf[j+1], &zBuf[i+4]); // NOLINT
               } else {
                  zBuf[j+1] = 0;
               }
               i = j - 1;
               if (i < -1) i = -1;
               continue;
            }
         }
         delete[] base->fZPath;
         base->fZPath = zBuf;
      }
      ReplaceStr(&base->fZQuery, term->fZQuery);
      ReplaceStr(&base->fZFragment, term->fZFragment);
   }
   delete term;
 
   result = base->BuildUri();
   delete base;
 
   return result;
}