Add null output stream

2 files changed, 27 insertions, 0 deletions

diff --git a/src/cairo-output-stream-private.h b/src/cairo-output-stream-private.h
index 37239f26..6c60f092 100644
--- a/src/cairo-output-stream-private.h
+++ b/src/cairo-output-stream-private.h
@@ -161,6 +161,9 @@ _cairo_memory_stream_copy (cairo_output_stream_t *base,
 cairo_private int
 _cairo_memory_stream_length (cairo_output_stream_t *stream);
 
+cairo_output_stream_t *
+_cairo_null_stream_create (void);
+
 /* cairo-base85-stream.c */
 cairo_private cairo_output_stream_t *
 _cairo_base85_stream_create (cairo_output_stream_t *output);
@@ -169,4 +172,5 @@ _cairo_base85_stream_create (cairo_output_stream_t *output);
 cairo_private cairo_output_stream_t *
 _cairo_deflate_stream_create (cairo_output_stream_t *output);
 
+
 #endif /* CAIRO_OUTPUT_STREAM_PRIVATE_H */
diff --git a/src/cairo-output-stream.c b/src/cairo-output-stream.c
index 206ed30b..7062007e 100644
--- a/src/cairo-output-stream.c
+++ b/src/cairo-output-stream.c
@@ -676,3 +676,26 @@ _cairo_memory_stream_length (cairo_output_stream_t *base)
 
     return _cairo_array_num_elements (&stream->array);
 }
+
+static cairo_status_t
+null_write (cairo_output_stream_t *base,
+	    const unsigned char *data, unsigned int length)
+{
+    return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_output_stream_t *
+_cairo_null_stream_create (void)
+{
+    cairo_output_stream_t *stream;
+
+    stream = malloc (sizeof *stream);
+    if (stream == NULL) {
+	_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
+	return (cairo_output_stream_t *) &_cairo_output_stream_nil;
+    }
+
+    _cairo_output_stream_init (stream, null_write, NULL);
+
+    return stream;
+}