HTTPMediaIO: Implement SetSize and GetSize

* SetSize requests are denied where GetSize return the request
lengths. Note that flags are changed accordingly.

src/add-ons/media/plugins/http_streamer/HTTPMediaIO.cpp

@@ -19,7 +19,8 @@ public:
 						:
 						BUrlProtocolAsynchronousListener(true),
 						fRequest(NULL),
-						fAdapterIO(owner)
+						fAdapterIO(owner),
+						fTotalSize(0)
 		{
 			fInputAdapter = fAdapterIO->BuildInputAdapter();
 		}
@@ -39,6 +40,7 @@ public:
 				fRequest->Stop();
 
 			fRequest = request;
+			fTotalSize = request->Result().Length();
 		}
 
 		void		DataReceived(BUrlRequest* request, const char* data,
@@ -62,17 +64,23 @@ public:
 			delete request;
 		}
 
+		off_t		TotalSize() const
+		{
+			return fTotalSize;
+		}
+
 private:
 		BUrlRequest*	fRequest;
 		BAdapterIO*		fAdapterIO;
 		BInputAdapter*	fInputAdapter;
+		off_t			fTotalSize;
 };
 
 
 HTTPMediaIO::HTTPMediaIO(BUrl* url)
 	:
 	BAdapterIO(
-		B_MEDIA_STREAMING | B_MEDIA_MUTABLE_SIZE | B_MEDIA_SEEK_BACKWARD,
+		B_MEDIA_STREAMING | B_MEDIA_SEEK_BACKWARD,
 		B_INFINITE_TIMEOUT),
 	fInitErr(B_OK)
 {
@@ -110,3 +118,18 @@ HTTPMediaIO::WriteAt(off_t position, const void* buffer, size_t size)
 {
 	return B_NOT_SUPPORTED;
 }
+
+
+status_t
+HTTPMediaIO::SetSize(off_t size)
+{
+	return B_NOT_SUPPORTED;
+}
+
+
+status_t
+HTTPMediaIO::GetSize(off_t* size) const
+{
+	*size = fListener->TotalSize();
+	return B_OK;
+}

src/add-ons/media/plugins/http_streamer/HTTPMediaIO.h

@@ -25,6 +25,9 @@ public:
 	virtual	ssize_t						WriteAt(off_t position,
 											const void* buffer, size_t size);
 
+	virtual status_t					SetSize(off_t size);
+	virtual status_t					GetSize(off_t* size) const;
+
 private:
 	BUrlContext*						fContext;
 	BUrlRequest*						fReq;