1 files changed, 7 insertions, 0 deletions
diff --git a/image/SourceBuffer.h b/image/SourceBuffer.h
index 64727e65e2..6f2c74d33b 100644
--- a/image/SourceBuffer.h
+++ b/image/SourceBuffer.h
@@ -174,6 +174,13 @@ public:
     return mState == READY ? mData.mIterating.mNextReadLength : 0;
   }
 
+  /// If we're ready to read, returns whether or not everything available thus
+  /// far has been in the same contiguous buffer.
+  bool IsContiguous() const {
+    MOZ_ASSERT(mState == READY, "Calling IsContiguous() in the wrong state");
+    return mState == READY ? mData.mIterating.mChunk == 0 : false;
+  }
+  
   /// @return a count of the chunks we've advanced through.
   uint32_t ChunkCount() const { return mChunkCount; }