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+/*
+ * libjingle
+ * Copyright 2010, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. 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.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#ifndef TALK_P2P_BASE_PARSING_H_
+#define TALK_P2P_BASE_PARSING_H_
+
+#include <string>
+#include <vector>
+#include "talk/base/basictypes.h"
+#include "talk/xmllite/xmlelement.h"  // Needed to delete ParseError.extra.
+
+namespace cricket {
+
+// We decided "bool Parse(in, out*, error*)" is generally the best
+// parse signature.  "out Parse(in)" doesn't allow for errors.
+// "error* Parse(in, out*)" doesn't allow flexible memory management.
+// If a function can't return an error (common for unparsing), "void
+// Parse(in, out*)" is acceptable.
+
+// The common error class for parsing and unparsing actions,
+// transports, and payloads.
+struct ParseError {
+ public:
+  // explains the error
+  std::string text;
+  // provide details about what wasn't parsable
+  const buzz::XmlElement* extra;
+
+  ParseError() : extra(NULL) {}
+
+  ~ParseError() {
+    delete extra;
+  }
+
+  void SetText(const std::string& text) {
+    this->text = text;
+  }
+};
+
+bool BadParse(const std::string& text, ParseError* err);
+
+// helper XML functions
+std::string GetXmlAttr(const buzz::XmlElement* elem,
+                       const buzz::QName& name,
+                       const std::string& def);
+int GetXmlAttr(const buzz::XmlElement* elem,
+               const buzz::QName& name, int def);
+void AddXmlAttr(buzz::XmlElement* elem,
+                const buzz::QName& name, int n);
+void SetXmlBody(buzz::XmlElement* elem, uint32 u);
+const buzz::XmlElement* GetXmlChild(const buzz::XmlElement* parent,
+                                    const std::string& name);
+bool RequireXmlChild(const buzz::XmlElement* parent,
+                     const std::string& name,
+                     const buzz::XmlElement** child,
+                     ParseError* error);
+bool RequireXmlAttr(const buzz::XmlElement* elem,
+                    const buzz::QName& name,
+                    std::string* value,
+                    ParseError* error);
+void AddXmlChildren(buzz::XmlElement* parent,
+                    const std::vector<buzz::XmlElement*>& children);
+void CopyXmlChildren(buzz::XmlElement* source, buzz::XmlElement* dest);
+std::vector<buzz::XmlElement*> CopyOfXmlChildren(const buzz::XmlElement* elem);
+
+}  // namespace cricket
+
+#endif  // TALK_P2P_BASE_PARSING_H_