The GtkRadiant sources as originally released under the GPL license.

radiant/xmlstuff.h

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+/*
+Copyright (c) 2001, Loki software, inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+Redistributions of source code must retain the above copyright notice, this list 
+of conditions and the following disclaimer.
+
+Redistributions in binary form must reproduce the above copyright notice, this
+list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+Neither the name of Loki software nor the names of its contributors may be used 
+to endorse or promote products derived from this software without specific prior 
+written permission. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY 
+DIRECT,INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+*/
+
+//-----------------------------------------------------------------------------
+//
+// DESCRIPTION:
+// header for xml stuff used in radiant
+//
+
+#ifndef __XMLSTUFF__
+#define __XMLSTUFF__
+
+#include "libxml/parser.h"
+
+#include <cstddef>
+
+class ISAXHandler;
+
+// a 'user data' structure we pass along in the SAX callbacks to represent the current state
+// the recurse value tracks the current depth in the tree
+// message_info also stores information to exit the stream listening cleanly with an error:
+//   if msg_level == SYS_ERR, then we will reset the listening at the end of the current node
+//   the level for stopping the feed is stored in stop_depth
+// unkown nodes are ignored, we use ignore_depth to track the level we start ignoring from
+struct message_info_t
+{
+  int msg_level; // current message level (SYS_MSG, SYS_WRN, SYS_ERR)
+  int recurse; // current recursion depth (used to track various things)
+  int ignore_depth; // the ignore depth limit when we are jumping over unknown nodes (0 means we are not ignoring)
+  int stop_depth; // the depth we need to stop at the end
+  int geometry_depth; // are we parsing some geometry information (i.e. do we forward the SAX calls?)
+  ISAXHandler* pGeometry; // the handler
+
+  static const int bufsize = 1024;
+  char m_buffer[bufsize];
+  std::size_t m_length;
+};
+
+class IGL2DWindow;
+
+class ISAXHandler
+{
+public:
+  virtual void Release()
+  {
+  }
+  virtual void saxStartElement(message_info_t* ctx, const xmlChar* name, const xmlChar** attrs) = 0;
+  virtual void saxEndElement(message_info_t* ctx, const xmlChar* name) = 0;
+  virtual void saxCharacters(message_info_t* ctx, const xmlChar* ch, int len) = 0;
+  virtual const char* getName()
+  {
+    return NULL;
+  }
+  virtual IGL2DWindow* Highlight()
+  {
+    return 0;
+  }
+  virtual void DropHighlight()
+  {
+  }
+};
+
+#endif