[gmime] Added GMimeStreamFilter:owner

[Jeffrey Stedfast <fejj src gnome org>]

commit 66b651b084fdde1ec30049528d0c7f0a7b805b30
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Sat Mar 18 07:23:58 2017 -0400

    Added GMimeStreamFilter:owner
    
    Also don't flush the source stream when we flush the filtered stream.

 gmime/gmime-stream-filter.c |   49 +++++++++++++++++++++++++++++++++++++++---
 gmime/gmime-stream-filter.h |    4 +++
 2 files changed, 49 insertions(+), 4 deletions(-)
---
diff --git a/gmime/gmime-stream-filter.c b/gmime/gmime-stream-filter.c
index e5a90ee..faa4471 100644
--- a/gmime/gmime-stream-filter.c
+++ b/gmime/gmime-stream-filter.c
@@ -139,6 +139,7 @@ static void
 g_mime_stream_filter_init (GMimeStreamFilter *stream, GMimeStreamFilterClass *klass)
 {
        stream->source = NULL;
+       stream->owner = FALSE;
        stream->priv = g_new (struct _GMimeStreamFilterPrivate, 1);
        stream->priv->filters = NULL;
        stream->priv->filterid = 0;
@@ -287,7 +288,7 @@ stream_flush (GMimeStream *stream)
        if (len > 0 && g_mime_stream_write (filter->source, buffer, len) == -1)
                return -1;
        
-       return g_mime_stream_flush (filter->source);
+       return 0;
 }
 
 static int
@@ -299,7 +300,10 @@ stream_close (GMimeStream *stream)
        if (!priv->last_was_read)
                stream_flush (stream);
        
-       return g_mime_stream_close (filter->source);
+       if (filter->owner)
+               return g_mime_stream_close (filter->source);
+       
+       return 0;
 }
 
 static gboolean
@@ -392,9 +396,9 @@ stream_substream (GMimeStream *stream, gint64 start, gint64 end)
                sub->priv->filterid = filter->priv->filterid;
        }
        
-       g_mime_stream_construct (GMIME_STREAM (filter), start, end);
+       g_mime_stream_construct ((GMimeStream *) filter, start, end);
        
-       return GMIME_STREAM (sub);
+       return (GMimeStream *) sub;
 }
 
 
@@ -497,3 +501,40 @@ g_mime_stream_filter_remove (GMimeStreamFilter *stream, int id)
                f = f->next;
        }
 }
+
+
+/**
+ * g_mime_stream_filter_set_owner:
+ * @stream: a #GMimeStreamFilter
+ * @owner: %TRUE if this stream should own the source stream or %FALSE otherwise
+ *
+ * Sets whether or not @stream owns the source stream..
+ *
+ * Note: @owner should be %TRUE if the stream should close() the
+ * backend source stream when destroyed or %FALSE otherwise.
+ **/
+void
+g_mime_stream_filter_set_owner (GMimeStreamFilter *stream, gboolean owner)
+{
+       g_return_if_fail (GMIME_IS_STREAM_FILTER (stream));
+       
+       stream->owner = owner;
+}
+
+
+/**
+ * g_mime_stream_filter_get_owner:
+ * @stream: a #GMimeStreamFilter
+ *
+ * Gets whether or not @stream owns the source stream.
+ *
+ * Returns: %TRUE if @stream owns the source stream or %FALSE
+ * otherwise.
+ **/
+gboolean
+g_mime_stream_filter_get_owner (GMimeStreamFilter *stream)
+{
+       g_return_val_if_fail (GMIME_IS_STREAM_FILTER (stream), FALSE);
+       
+       return stream->owner;
+}
diff --git a/gmime/gmime-stream-filter.h b/gmime/gmime-stream-filter.h
index a4544b4..58c5bd6 100644
--- a/gmime/gmime-stream-filter.h
+++ b/gmime/gmime-stream-filter.h
@@ -51,6 +51,7 @@ struct _GMimeStreamFilter {
        struct _GMimeStreamFilterPrivate *priv;
        
        GMimeStream *source;
+       gboolean owner;
 };
 
 struct _GMimeStreamFilterClass {
@@ -66,6 +67,9 @@ GMimeStream *g_mime_stream_filter_new (GMimeStream *stream);
 int g_mime_stream_filter_add (GMimeStreamFilter *stream, GMimeFilter *filter);
 void g_mime_stream_filter_remove (GMimeStreamFilter *stream, int id);
 
+void g_mime_stream_filter_set_owner (GMimeStreamFilter *stream, gboolean owner);
+gboolean g_mime_stream_filter_get_owner (GMimeStreamFilter *stream);
+
 G_END_DECLS
 
 #endif /* __GMIME_STREAM_FILTER_H__ */