Added new ReaderWriter methods for recording what protocols, extensions and options are

support by ReaderWriters

src/osgDB/FileNameUtils.cpp

@@ -113,17 +113,21 @@ std::string osgDB::convertFileNameToNativeStyle(const std::string& fileName)
 
 std::string osgDB::getLowerCaseFileExtension(const std::string& filename)
 {
-    std::string ext = osgDB::getFileExtension(filename);
-    for(std::string::iterator itr=ext.begin();
-        itr!=ext.end();
+    return convertToLowerCase(osgDB::getFileExtension(filename));
+}
+
+std::string osgDB::convertToLowerCase(const std::string& str)
+{
+    std::string lowcase_str(str);
+    for(std::string::iterator itr=lowcase_str.begin();
+        itr!=lowcase_str.end();
         ++itr)
     {
         *itr = tolower(*itr);
     }
-    return ext;
+    return lowcase_str;
 }
 
-
 // strip one level of extension from the filename.
 std::string osgDB::getNameLessExtension(const std::string& fileName)
 {

src/osgDB/ReaderWriter.cpp

@@ -12,6 +12,7 @@
 */
 
 #include <osgDB/ReaderWriter>
+#include <osgDB/FileNameUtils>
 #include <osgDB/Archive>
 
 using namespace osgDB;
@@ -33,3 +34,24 @@ osg::Shader* ReaderWriter::ReadResult::takeShader() { osg::Shader* shader=dynami
 ReaderWriter::~ReaderWriter()
 {
 }
+
+bool ReaderWriter::acceptsExtension(const std::string& extension) const
+{
+    std::string lowercase_ext = convertToLowerCase(extension);
+    return (_supportedExtensions.count(lowercase_ext)!=0);
+}
+
+void ReaderWriter::supportsProtocol(const std::string& fmt, const std::string& description)
+{
+    _supportedProtocols[convertToLowerCase(fmt)] = description;
+}
+
+void ReaderWriter::supportsExtension(const std::string& fmt, const std::string& description)
+{
+    _supportedExtensions[convertToLowerCase(fmt)] = description;
+}
+
+void ReaderWriter::supportsOption(const std::string& fmt, const std::string& description)
+{
+    _supportedOptions[fmt] = description;
+}