[Fix] Do not lowercase Content-Disposition to perform decoding

src/libmime/content_type.c

@@ -210,7 +210,7 @@ rspamd_content_disposition_parse (const gchar *in,
 	memcpy (val.lc_data, in, len);
 	rspamd_str_lc (val.lc_data, len);
 
-	if (rspamd_content_disposition_parser (val.lc_data, len, &val, pool)) {
+	if (rspamd_content_disposition_parser (in, len, &val, pool)) {
 		res = rspamd_mempool_alloc (pool, sizeof (val));
 		memcpy (res, &val, sizeof (val));
 

test/lua/unit/rfc2047.lua

@@ -43,6 +43,7 @@ context("RFC2047 decoding", function()
  =?windows-1251?Q?=E5=EC?=]], "Вы сможете характеризоваться зорким зрением"},
       {'v=1; a=rsa-sha256; c=relaxed/relaxed; d=yoni.za.org; s=testdkim1;',
       'v=1; a=rsa-sha256; c=relaxed/relaxed; d=yoni.za.org; s=testdkim1;'},
+      {"=?windows-1251?B?xO7q8+zl7fIuc2NyLnV1ZQ==?=", "Документ.scr.uue"},
     }
 
     local pool = ffi.C.rspamd_mempool_new(4096, "lua")