When charset_no is 0, 255 is now used as the default value.

Author: SakiTakamachi

ext/mysqlnd/mysqlnd_charset.h

@@ -19,6 +19,8 @@
 #ifndef MYSQLND_CHARSET_H
 #define MYSQLND_CHARSET_H
 
+#define MYSQLND_DEFAULT_PROTOCOL_CHARSET 255
+
 PHPAPI zend_ulong mysqlnd_cset_escape_quotes(const MYSQLND_CHARSET * const charset, char * newstr,
 											 const char * escapestr, const size_t escapestr_len);
 

ext/mysqlnd/mysqlnd_commands.c

@@ -642,7 +642,7 @@ MYSQLND_METHOD(mysqlnd_command, handshake)(MYSQLND_CONN_DATA * const conn, const
 	conn->protocol_version	= greet_packet.protocol_version;
 	conn->server_version	= mnd_pestrdup(greet_packet.server_version, conn->persistent);
 
-	conn->greet_charset = mysqlnd_find_charset_nr(greet_packet.charset_no);
+	conn->greet_charset = mysqlnd_find_charset_nr(greet_packet.charset_no != 0 ? greet_packet.charset_no : MYSQLND_DEFAULT_PROTOCOL_CHARSET);
 	if (!conn->greet_charset) {
 		char * msg;
 		mnd_sprintf(&msg, 0, "Server sent charset (%d) unknown to the client. Please, report to the developers", greet_packet.charset_no);