[gmime] Use a hard-coded max-level for now (until devs need to be able to set their own max level)

[Rico Tzschichholz <ricotz src gnome org>]

commit b1b7596ee8fbb3ed9b8d435f4c821ac374d9583f
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Wed Nov 13 17:07:31 2019 -0500

    Use a hard-coded max-level for now (until devs need to be able to set their own max level)

 gmime/gmime-parser.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/gmime/gmime-parser.c b/gmime/gmime-parser.c
index fe2f5386..b7b63c7e 100644
--- a/gmime/gmime-parser.c
+++ b/gmime/gmime-parser.c
@@ -47,6 +47,7 @@
 
 #define d(x)
 
+#define MAX_LEVEL 1024
 
 /**
  * SECTION: gmime-parser
@@ -165,7 +166,6 @@ struct _GMimeParserPrivate {
        size_t headerleft;
        
        BoundaryStack *bounds;
-       guint max_level;
        
        GMimeOpenPGPState openpgp;
        short int state;
@@ -388,7 +388,6 @@ parser_init (GMimeParser *parser, GMimeStream *stream)
        priv->seekable = offset != -1;
        
        priv->bounds = NULL;
-       priv->max_level = 1024;
 }
 
 static void
@@ -1788,7 +1787,7 @@ parser_construct_leaf_part (GMimeParser *parser, GMimeParserOptions *options, Co
        if (!g_ascii_strcasecmp (type, "message") && is_rfc822 (subtype)) {
                gboolean is_encoded = FALSE;
                
-               if (depth >= priv->max_level) {
+               if (depth >= MAX_LEVEL) {
                        /* The maximum MIME nesting level has been exceeded. Treat this message/rfc822
                         * part as if it was a leaf-node MIME part (i.e. don't recursively parse the
                         * message content). */
@@ -2002,7 +2001,7 @@ parser_construct_multipart (GMimeParser *parser, GMimeParserOptions *options, Co
                }
        }
        
-       if ((boundary = g_mime_object_get_content_type_parameter (object, "boundary")) && depth < 
priv->max_level) {
+       if ((boundary = g_mime_object_get_content_type_parameter (object, "boundary")) && depth < MAX_LEVEL) {
                parser_push_boundary (parser, boundary);
                
                *found = parser_scan_multipart_prologue (parser, multipart);
@@ -2033,7 +2032,7 @@ parser_construct_multipart (GMimeParser *parser, GMimeParserOptions *options, Co
                else if (*found == BOUNDARY_PARENT && found_immediate_boundary (priv, FALSE))
                        *found = BOUNDARY_IMMEDIATE;
        } else {
-               if (depth >= priv->max_level) {
+               if (depth >= MAX_LEVEL) {
                        _g_mime_parser_options_warn (options, priv->headers_begin, 
GMIME_CRIT_NESTING_OVERFLOW, NULL);
                        w(g_warning ("maximum nesting level exceeded @ boundary = %s", boundary));
                } else {