--- a/src/lib-imap/imap-bodystructure.c	Sun Jul 03 17:18:28 2005 +0300
+++ b/src/lib-imap/imap-bodystructure.c	Sun Jul 03 17:18:53 2005 +0300
@@ -439,6 +439,51 @@
 	}
 }
 
+int imap_bodystructure_is_plain_7bit(struct message_part *part)
+{
+	struct message_part_body_data *data = part->context;
+
+	i_assert(part->parent == NULL);
+
+	if (data == NULL) {
+		/* no bodystructure headers found */
+		return TRUE;
+	}
+
+	/* if content-type is text/xxx we don't have to check any
+	   multipart stuff */
+	if ((part->flags & MESSAGE_PART_FLAG_TEXT) == 0)
+		return FALSE;
+	if (part->next != NULL || part->children != NULL)
+		return FALSE; /* shouldn't happen normally.. */
+
+	/* must be text/plain */
+	if (data->content_subtype != NULL &&
+	    strcasecmp(data->content_subtype, "\"plain\"") != 0)
+		return FALSE;
+
+	/* only allowed parameter is charset=us-ascii, which is also default */
+	if (data->content_type_params != NULL &&
+	    strcasecmp(data->content_type_params, DEFAULT_CHARSET) != 0)
+		return FALSE;
+
+	if (data->content_id != NULL ||
+	    data->content_description != NULL)
+		return FALSE;
+
+	if (data->content_transfer_encoding != NULL &&
+	    strcasecmp(data->content_transfer_encoding, "\"7bit\"") != 0)
+		return FALSE;
+
+	/* BODYSTRUCTURE checks: */
+	if (data->content_md5 != NULL ||
+	    data->content_disposition != NULL ||
+	    data->content_language != NULL)
+		return FALSE;
+
+	return TRUE;
+}
+
 void imap_bodystructure_write(struct message_part *part,
 			      string_t *dest, int extended)
 {

--- a/src/lib-imap/imap-bodystructure.h	Sun Jul 03 17:18:28 2005 +0300
+++ b/src/lib-imap/imap-bodystructure.h	Sun Jul 03 17:18:53 2005 +0300
@@ -8,6 +8,10 @@
 void imap_bodystructure_parse_header(pool_t pool, struct message_part *part,
 				     struct message_header_line *hdr);
 
+/* Returns TRUE if BODYSTRUCTURE is
+   ("text" "plain" ("charset" "us-ascii") NIL NIL "7bit" n n NIL NIL NIL) */
+int imap_bodystructure_is_plain_7bit(struct message_part *part);
+
 void imap_bodystructure_write(struct message_part *part,
 			      string_t *dest, int extended);