[evolution/wip/gsettings] Prefer g_seekable_seek() over camel_stream_reset().

[Rodrigo Moya <rodrigo src gnome org>]

commit c72aba8f7c13cdc68b1f3dbc1d381be45e0c4cb8
Author: Matthew Barnes <mbarnes redhat com>
Date:   Tue Jul 5 08:16:13 2011 -0400

    Prefer g_seekable_seek() over camel_stream_reset().
    
    When a stream is obviously a file or memory stream (both of which
    implement the GSeekable interface), use g_seekable_seek() instead of
    camel_stream_reset().
    
    This is helping me discover if it's safe to remove camel_stream_reset().
    We want to eventually move to GIO streams, which have no reset method.

 em-format/em-format-quote.c              |    8 +++++++-
 em-format/em-format.c                    |    3 ++-
 em-format/em-inline-filter.c             |    2 +-
 mail/e-mail-folder-utils.c               |   22 +++++++++++++---------
 mail/em-composer-utils.c                 |    1 -
 modules/mail/e-mail-attachment-handler.c |    2 +-
 modules/plugin-mono/Camel.cs             |    6 ------
 7 files changed, 24 insertions(+), 20 deletions(-)
---
diff --git a/em-format/em-format-quote.c b/em-format/em-format-quote.c
index a8f1bf3..a5a8d0d 100644
--- a/em-format/em-format-quote.c
+++ b/em-format/em-format-quote.c
@@ -94,8 +94,11 @@ emfq_format_clone (EMFormat *emf,
 	EM_FORMAT_CLASS (parent_class)->format_clone (
 		emf, folder, uid, msg, src, cancellable);
 
+	g_seekable_seek (
+		G_SEEKABLE (emfq->priv->stream),
+		0, G_SEEK_SET, NULL, NULL);
+
 	gconf = gconf_client_get_default ();
-	camel_stream_reset (emfq->priv->stream, NULL);
 	if (gconf_client_get_bool (
 		gconf, "/apps/evolution/mail/composer/top_signature", NULL))
 		camel_stream_printf (emfq->priv->stream, "<br>\n");
@@ -257,6 +260,9 @@ em_format_quote_new (const gchar *credits,
 
 	g_return_val_if_fail (CAMEL_IS_STREAM (stream), NULL);
 
+	/* Steam must also be seekable so we can reset its position. */
+	g_return_val_if_fail (G_IS_SEEKABLE (stream), NULL);
+
 	emfq = g_object_new (EM_TYPE_FORMAT_QUOTE, NULL);
 
 	emfq->priv->credits = g_strdup (credits);
diff --git a/em-format/em-format.c b/em-format/em-format.c
index 1f9634d..1c2624f 100644
--- a/em-format/em-format.c
+++ b/em-format/em-format.c
@@ -1422,7 +1422,8 @@ em_format_format_text (EMFormat *emf,
 		(CamelStream *) filter_stream, cancellable, NULL);
 	camel_stream_flush ((CamelStream *) filter_stream, cancellable, NULL);
 	g_object_unref (filter_stream);
-	camel_stream_reset (mem_stream, NULL);
+
+	g_seekable_seek (G_SEEKABLE (mem_stream), 0, G_SEEK_SET, NULL, NULL);
 
 	if (max == -1 || size == -1 || size < (max * 1024) || emf->composer) {
 		camel_stream_write_to_stream (
diff --git a/em-format/em-inline-filter.c b/em-format/em-inline-filter.c
index c7a8014..1f96395 100644
--- a/em-format/em-inline-filter.c
+++ b/em-format/em-inline-filter.c
@@ -121,7 +121,7 @@ inline_filter_add_part (EMInlineFilter *emif, const gchar *data, gint len)
 	}
 
 	emif->data = g_byte_array_new ();
-	camel_stream_reset (mem, NULL);
+	g_seekable_seek (G_SEEKABLE (mem), 0, G_SEEK_SET, NULL, NULL);
 
 	dw = camel_data_wrapper_new ();
 	if (encoding == emif->base_encoding && (encoding == CAMEL_TRANSFER_ENCODING_BASE64 || encoding == CAMEL_TRANSFER_ENCODING_QUOTEDPRINTABLE)) {
diff --git a/mail/e-mail-folder-utils.c b/mail/e-mail-folder-utils.c
index f255c73..64bdbdb 100644
--- a/mail/e-mail-folder-utils.c
+++ b/mail/e-mail-folder-utils.c
@@ -1159,9 +1159,7 @@ e_mail_folder_save_messages_sync (CamelFolder *folder,
 {
 	GFileOutputStream *file_output_stream;
 	GByteArray *byte_array;
-	CamelMimeFilter *filter;
 	CamelStream *base_stream;
-	CamelStream *stream;
 	gboolean success = TRUE;
 	guint ii;
 
@@ -1192,15 +1190,12 @@ e_mail_folder_save_messages_sync (CamelFolder *folder,
 
 	/* CamelStreamMem takes ownership of the GByteArray. */
 	byte_array = g_byte_array_new ();
-	filter = camel_mime_filter_from_new ();
 	base_stream = camel_stream_mem_new_with_byte_array (byte_array);
-	stream = camel_stream_filter_new (base_stream);
-	camel_stream_filter_add (CAMEL_STREAM_FILTER (stream), filter);
-	g_object_unref (base_stream);
-	g_object_unref (filter);
 
 	for (ii = 0; ii < message_uids->len; ii++) {
 		CamelMimeMessage *message;
+		CamelMimeFilter *filter;
+		CamelStream *stream;
 		const gchar *uid;
 		gchar *from_line;
 		gint percent;
@@ -1232,10 +1227,17 @@ e_mail_folder_save_messages_sync (CamelFolder *folder,
 			goto exit;
 		}
 
+		filter = camel_mime_filter_from_new ();
+		stream = camel_stream_filter_new (base_stream);
+		camel_stream_filter_add (CAMEL_STREAM_FILTER (stream), filter);
+
 		retval = camel_data_wrapper_write_to_stream_sync (
 			CAMEL_DATA_WRAPPER (message),
 			stream, cancellable, error);
 
+		g_object_unref (filter);
+		g_object_unref (stream);
+
 		if (retval == -1) {
 			g_object_unref (message);
 			goto exit;
@@ -1258,14 +1260,16 @@ e_mail_folder_save_messages_sync (CamelFolder *folder,
 
 		/* Flush the buffer for the next message.
 		 * For memory streams this never fails. */
-		camel_stream_reset (stream, NULL);
+		g_seekable_seek (
+			G_SEEKABLE (base_stream),
+			0, G_SEEK_SET, NULL, NULL);
 
 		g_object_unref (message);
 	}
 
 exit:
 	g_object_unref (file_output_stream);
-	g_object_unref (stream);
+	g_object_unref (base_stream);
 
 	camel_operation_pop_message (cancellable);
 
diff --git a/mail/em-composer-utils.c b/mail/em-composer-utils.c
index 2dcc687..c3b5465 100644
--- a/mail/em-composer-utils.c
+++ b/mail/em-composer-utils.c
@@ -1153,7 +1153,6 @@ traverse_parts (GSList *clues, CamelMimeMessage *message, CamelDataWrapper *cont
 
 		if (replace_variables (clues, message, &str)) {
 			stream = camel_stream_mem_new_with_buffer (str, strlen (str));
-			camel_stream_reset (stream, NULL);
 			camel_data_wrapper_construct_from_stream_sync (
 				content, stream, NULL, NULL);
 			g_object_unref (stream);
diff --git a/modules/mail/e-mail-attachment-handler.c b/modules/mail/e-mail-attachment-handler.c
index e65e687..e6493f2 100644
--- a/modules/mail/e-mail-attachment-handler.c
+++ b/modules/mail/e-mail-attachment-handler.c
@@ -221,7 +221,7 @@ mail_attachment_handler_message_rfc822 (EAttachmentView *view,
 
 	stream = camel_stream_mem_new ();
 	camel_stream_write (stream, data, length, NULL, NULL);
-	camel_stream_reset (stream, NULL);
+	g_seekable_seek (G_SEEKABLE (stream), 0, G_SEEK_SET, NULL, NULL);
 
 	message = camel_mime_message_new ();
 	wrapper = CAMEL_DATA_WRAPPER (message);
diff --git a/modules/plugin-mono/Camel.cs b/modules/plugin-mono/Camel.cs
index c415498..21fbe46 100644
--- a/modules/plugin-mono/Camel.cs
+++ b/modules/plugin-mono/Camel.cs
@@ -630,7 +630,6 @@ namespace Camel {
 		[DllImport("camel-1.2")] static extern int camel_stream_eos(IntPtr o);
 		[DllImport("camel-1.2")] static extern int camel_stream_close(IntPtr o);
 		[DllImport("camel-1.2")] static extern int camel_stream_flush(IntPtr o);
-		[DllImport("camel-1.2")] static extern int camel_stream_reset(IntPtr o);
 
 		public int write(byte [] data, int len) {
 			int ret;
@@ -671,11 +670,6 @@ namespace Camel {
 				throw new Exception(Exception.Type.SYSTEM, "IO close Error");
 		}
 
-		public void reset() {
-			if (camel_stream_reset(cobject) == -1)
-				throw new Exception(Exception.Type.SYSTEM, "IO reset Error");
-		}
-
 		public void flush() {
 			if (camel_stream_flush(cobject) == -1)
 				throw new Exception(Exception.Type.SYSTEM, "IO close Error");