From 46d6851d8b82862965e3fd01aaa27996b50daa58 Mon Sep 17 00:00:00 2001
From: Ethan Mahintorabi <EthanMahintorabi@yahoo.com>
Date: Fri, 18 May 2018 14:21:48 -0700
Subject: [PATCH] Updating the mysql2_mysql_enc_to_rb conversion table to 8.0
 List (#976)

Also add a check to make sure we do not go out of bounds.
---
 .travis.yml                    |  1 +
 ext/mysql2/mysql_enc_to_ruby.h | 10 ++++++++++
 ext/mysql2/result.c            |  3 ++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index a8661f785..396e00929 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ addons:
   hosts:
     - mysql2gem.example.com
   apt:
+    update: true
     packages:
     - mysql-server-5.6
     - mysql-client-core-5.6
diff --git a/ext/mysql2/mysql_enc_to_ruby.h b/ext/mysql2/mysql_enc_to_ruby.h
index df167b2a6..985fdfeeb 100644
--- a/ext/mysql2/mysql_enc_to_ruby.h
+++ b/ext/mysql2/mysql_enc_to_ruby.h
@@ -245,5 +245,15 @@ static const char *mysql2_mysql_enc_to_rb[] = {
   "UTF-8",
   "UTF-8",
   "UTF-8",
+  "UTF-8",
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
   "UTF-8"
 };
+
+#define CHARSETNR_SIZE (sizeof(mysql2_mysql_enc_to_rb)/sizeof(mysql2_mysql_enc_to_rb[0]))
diff --git a/ext/mysql2/result.c b/ext/mysql2/result.c
index a4957ee42..0ab38aabe 100644
--- a/ext/mysql2/result.c
+++ b/ext/mysql2/result.c
@@ -179,7 +179,8 @@ static VALUE mysql2_set_field_string_encoding(VALUE val, MYSQL_FIELD field, rb_e
     const char *enc_name;
     int enc_index;
 
-    enc_name = mysql2_mysql_enc_to_rb[field.charsetnr-1];
+    enc_name = (field.charsetnr-1 < CHARSETNR_SIZE) ? mysql2_mysql_enc_to_rb[field.charsetnr-1] : NULL;
+    
     if (enc_name != NULL) {
       /* use the field encoding we were able to match */
       enc_index = rb_enc_find_index(enc_name);