DecoderBuffer: add method _get_stream()

src/DecoderBuffer.cxx

@@ -70,6 +70,12 @@ decoder_buffer_free(DecoderBuffer *buffer)
 	g_free(buffer);
 }
 
+const InputStream &
+decoder_buffer_get_stream(const DecoderBuffer *buffer)
+{
+	return *buffer->is;
+}
+
 bool
 decoder_buffer_is_empty(const DecoderBuffer *buffer)
 {

src/DecoderBuffer.hxx

@@ -53,6 +53,10 @@ void
 decoder_buffer_free(DecoderBuffer *buffer);
 
 gcc_pure
+const InputStream &
+decoder_buffer_get_stream(const DecoderBuffer *buffer);
+
+gcc_pure
 bool
 decoder_buffer_is_empty(const DecoderBuffer *buffer);