1 files changed, 54 insertions, 0 deletions
diff --git a/internal/xmpmeta/xml/utils.h b/internal/xmpmeta/xml/utils.h
new file mode 100644
index 0000000..f0f99e3
--- /dev/null
+++ b/internal/xmpmeta/xml/utils.h
@@ -0,0 +1,54 @@
+#ifndef DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_UTILS_H_  // NOLINT
+#define DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_UTILS_H_  // NOLINT
+
+#include <libxml/tree.h>
+
+#include <string>
+
+#include "base/port.h"
+
+namespace photos_editing_formats {
+namespace xml {
+
+// Convenience function to convert an xmlChar* to a char*
+inline const char* FromXmlChar(const xmlChar* in) {
+  return reinterpret_cast<const char*>(in);
+}
+
+// Convenience function to convert a char* to an xmlChar*.
+inline const xmlChar* ToXmlChar(const char* in) {
+  return reinterpret_cast<const xmlChar*>(in);
+}
+
+// Returns the first rdf:Description node; null if not found.
+xmlNodePtr GetFirstDescriptionElement(xmlDocPtr parent);
+
+// Returns the first rdf:Seq element found in the XML document.
+xmlNodePtr GetFirstSeqElement(xmlDocPtr parent);
+
+// Returns the first rdf:Seq element found in the given node.
+// Returns {@code parent} if that is itself an rdf:Seq node.
+xmlNodePtr GetFirstSeqElement(xmlNodePtr parent);
+
+// Returns the ith (zero-indexed) rdf:li node in the given rdf:Seq node.
+// Returns null if either of {@code index} < 0, {@code node} is null, or is
+// not an rdf:Seq node.
+xmlNodePtr GetElementAt(xmlNodePtr node, int index);
+
+// Returns the value in an rdf:li node. This is for a node whose value
+// does not have a name, e.g. <rdf:li>value</rdf:li>.
+// If the given rdf:li node has a nested node, it returns the string
+// representation of the contents of those nodes, which replaces the XML
+// tags with one whitespace character for each tag character.
+// This is treated as undefined behavior; it is the caller's responsibility
+// to remove any whitespace and newlines.
+const string GetLiNodeContent(xmlNodePtr node);
+
+// Returns the given XML doc serialized to a string.
+// For debugging purposes.
+const string XmlDocToString(const xmlDocPtr doc);
+
+}  // namespace xml
+}  // namespace photos_editing_formats
+
+#endif // DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_UTILS_H_  // NOLINT