[rygel] core: Throw error on seeking request for the unseekable

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit f9e4e756bc1349843b7d180e2d75cfbeaada27c3
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Fri Aug 6 19:18:58 2010 +0300

    core: Throw error on seeking request for the unseekable
    
    This is required by DLNA (7.3.33.4).

 src/rygel/rygel-http-byte-seek.vala |   16 +++++++++++-----
 src/rygel/rygel-http-time-seek.vala |   19 +++++++++++++------
 2 files changed, 24 insertions(+), 11 deletions(-)
---
diff --git a/src/rygel/rygel-http-byte-seek.vala b/src/rygel/rygel-http-byte-seek.vala
index ddd4c69..cafaee6 100644
--- a/src/rygel/rygel-http-byte-seek.vala
+++ b/src/rygel/rygel-http-byte-seek.vala
@@ -77,11 +77,17 @@ internal class Rygel.HTTPByteSeek : Rygel.HTTPSeek {
         base (request.msg, start, stop, total_length);
     }
 
-    public static bool needed (HTTPGet request) {
-        return (request.item.size > 0 &&
-                request.handler is HTTPIdentityHandler) ||
-               (request.thumbnail != null && request.thumbnail.size > 0) ||
-               (request.subtitle != null && request.subtitle.size > 0);
+    public static bool needed (HTTPGet request) throws HTTPRequestError {
+        var needed = (request.item.size > 0 &&
+                      request.handler is HTTPIdentityHandler) ||
+                     (request.thumbnail != null && request.thumbnail.size > 0) ||
+                     (request.subtitle != null && request.subtitle.size > 0);
+
+        if (!needed && request.msg.request_headers.get ("Range") != null) {
+            throw new HTTPRequestError.UNACCEPTABLE ("Invalid seek request");
+        }
+
+        return needed;
     }
 
     public override void add_response_headers () {
diff --git a/src/rygel/rygel-http-time-seek.vala b/src/rygel/rygel-http-time-seek.vala
index 8a101bf..7834d0e 100644
--- a/src/rygel/rygel-http-time-seek.vala
+++ b/src/rygel/rygel-http-time-seek.vala
@@ -78,12 +78,19 @@ internal class Rygel.HTTPTimeSeek : Rygel.HTTPSeek {
         base (request.msg, start, stop, duration);
     }
 
-    public static bool needed (HTTPGet request) {
-        return request.item.duration > 0 &&
-               (request.handler is HTTPTranscodeHandler ||
-                (request.thumbnail == null &&
-                 request.subtitle == null &&
-                 request.item.should_stream ()));
+    public static bool needed (HTTPGet request) throws HTTPRequestError {
+        var needed = request.item.duration > 0 &&
+                     (request.handler is HTTPTranscodeHandler ||
+                      (request.thumbnail == null &&
+                       request.subtitle == null &&
+                       request.item.should_stream ()));
+
+        if (!needed &&
+            request.msg.request_headers.get ("TimeSeekRange.dlna.org") != null) {
+            throw new HTTPRequestError.UNACCEPTABLE ("Invalid seek request");
+        }
+
+        return needed;
     }
 
     public override void add_response_headers () {