[gmime: 17/27] restore detection of wrongly coded header field names (#30)

[Jeffrey Stedfast <fejj src gnome org>]

commit 39a400855f0febffda01c9a20bdd38e7b0eb1ba9
Author: albrechtd <albrecht dress arcor de>
Date:   Thu Nov 9 21:36:00 2017 +0100

    restore detection of wrongly coded header field names (#30)
    
    restore detection of wrongly coded header field names

 gmime/gmime-parser.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/gmime/gmime-parser.c b/gmime/gmime-parser.c
index c641e3f..e4523f0 100644
--- a/gmime/gmime-parser.c
+++ b/gmime/gmime-parser.c
@@ -869,6 +869,17 @@ next_alloc_size (size_t n)
        priv->headerleft -= len;                                          \
 } G_STMT_END
 
+static inline gboolean
+is_7bit_clean (const gchar *str)
+{
+       for (; *str != '\0'; str++) {
+               if ((*str & 0x80) != 0) {
+                       return FALSE;
+               }
+       }
+       return TRUE;
+}
+
 static void
 header_parse (GMimeParser *parser, GMimeParserOptions *options)
 {
@@ -931,7 +942,7 @@ header_parse (GMimeParser *parser, GMimeParserOptions *options)
                priv->header_cb (parser, header->name, header->raw_value,
                                 header->offset, priv->user_data);
        
-       if (can_warn && !g_utf8_validate (header->raw_value, -1, NULL))
+       if (can_warn && (!is_7bit_clean(header->name) || !g_utf8_validate (header->raw_value, -1, NULL)))
                _g_mime_parser_options_warn (options, header->offset, GMIME_WARN_UNENCODED_8BIT_HEADER, 
header->name);
 }