From 59ddcd08f40c175903d426757d4722b5ea677fa7 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 13 May 2009 19:47:26 +0000
Subject: [PATCH] Added intial cut at fileExists() implement using libcurl. 
 Note, current implement loads the whole file and then discards it so is very
 in-efficient.  This implementation will soon be replaced.

---
 src/osgPlugins/curl/ReaderWriterCURL.cpp | 20 ++++++++++++++++++++
 src/osgPlugins/curl/ReaderWriterCURL.h   |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/src/osgPlugins/curl/ReaderWriterCURL.cpp b/src/osgPlugins/curl/ReaderWriterCURL.cpp
index 656089e27..71718d654 100644
--- a/src/osgPlugins/curl/ReaderWriterCURL.cpp
+++ b/src/osgPlugins/curl/ReaderWriterCURL.cpp
@@ -349,6 +349,8 @@ osgDB::ReaderWriter::ReadResult ReaderWriterCURL::readFile(ObjectType objectType
     //    return ReadResult::FILE_NOT_HANDLED;
     //}
 
+    osg::notify(osg::INFO)<<"CURL: Have readerwriter="<<reader<<std::endl;
+
     const char* proxyEnvAddress = getenv("OSG_CURL_PROXY");
     if (proxyEnvAddress) //Env Proxy Settings
     {
@@ -368,6 +370,8 @@ osgDB::ReaderWriter::ReadResult ReaderWriterCURL::readFile(ObjectType objectType
 
     if (curlResult.status()==ReadResult::FILE_LOADED)
     {
+        osg::notify(osg::INFO)<<"CURL: ReadResult::FILE_LOADED "<<std::endl;
+
         // If we do not already have a ReaderWriter, try to find one based on the
         // mime-type:
         if ( !reader )
@@ -490,6 +494,22 @@ bool ReaderWriterCURL::read(std::istream& fin, std::string& destination) const
 }
 #endif
 
+bool ReaderWriterCURL::fileExists(const std::string& filename, const osgDB::Options* options) const
+{
+    if (osgDB::containsServerAddress(filename))
+    {
+        osg::notify(osg::NOTICE)<<"Checking if file exists using curl plugin: "<<filename<<std::endl;
+
+        ReadResult result = readFile(OBJECT,filename,options);
+        return result.status()==osgDB::ReaderWriter::ReadResult::FILE_LOADED;
+    }
+    else
+    {
+        return ReaderWriter::fileExists(filename, options);
+    }
+}
+
+
 // now register with Registry to instantiate the above
 // reader/writer.
 REGISTER_OSGPLUGIN(curl, ReaderWriterCURL)
diff --git a/src/osgPlugins/curl/ReaderWriterCURL.h b/src/osgPlugins/curl/ReaderWriterCURL.h
index 93d499c12..b41b1177b 100644
--- a/src/osgPlugins/curl/ReaderWriterCURL.h
+++ b/src/osgPlugins/curl/ReaderWriterCURL.h
@@ -88,6 +88,8 @@ class ReaderWriterCURL : public osgDB::ReaderWriter
             return osgDB::equalCaseInsensitive(extension,"curl");
         }
 
+        virtual bool fileExists(const std::string& filename, const osgDB::Options* options) const;
+
         virtual ReadResult openArchive(const std::string& fileName,ArchiveStatus status, unsigned int , const Options* options) const
         {
             if (status!=READ) return ReadResult(ReadResult::FILE_NOT_HANDLED);