1 files changed, 17 insertions, 12 deletions

diff --git a/mysys/charset.c b/mysys/charset.c
index 1fe926a51d6..5bf0ea972a5 100644
--- a/mysys/charset.c
+++ b/mysys/charset.c
@@ -131,7 +131,8 @@ static void simple_cs_init_functions(CHARSET_INFO *cs)
     cs->coll= &my_collation_8bit_simple_ci_handler;
   
   cs->cset= &my_charset_8bit_handler;
-  cs->mbmaxlen    = 1;
+  cs->mbminlen= 1;
+  cs->mbmaxlen= 1;
 }
 
 
@@ -273,6 +274,7 @@ static int simple_cs_copy_data(CHARSET_INFO *to, CHARSET_INFO *from)
     if (create_fromuni(to))
       goto err;
   }
+  to->mbminlen= 1;
   to->mbmaxlen= 1;
 
   return 0;
@@ -357,7 +359,7 @@ static int add_collation(CHARSET_INFO *cs)
 }
 
 
-#define MAX_BUF 1024*16
+#define MY_MAX_ALLOWED_BUF 1024*1024
 #define MY_CHARSET_INDEX "Index.xml"
 
 const char *charsets_dir= NULL;
@@ -369,16 +371,19 @@ static my_bool my_read_charset_file(const char *filename, myf myflags)
   char *buf;
   int  fd;
   uint len;
+  MY_STAT stat_info;
   
-  if (!(buf= (char *)my_malloc(MAX_BUF,myflags)))
-    return FALSE;
+  if (!my_stat(filename, &stat_info, MYF(MY_WME)) ||
+       ((len= (uint)stat_info.st_size) > MY_MAX_ALLOWED_BUF) ||
+       !(buf= (char *)my_malloc(len,myflags)))
+    return TRUE;
   
   if ((fd=my_open(filename,O_RDONLY,myflags)) < 0)
   {
     my_free(buf,myflags);
     return TRUE;
   }
-  len=read(fd,buf,MAX_BUF);
+  len=read(fd,buf,len);
   my_close(fd,myflags);
   
   if (my_parse_charset_xml(buf,len,add_collation))
@@ -532,14 +537,14 @@ static CHARSET_INFO *get_internal_charset(uint cs_number, myf flags)
     while we may changing the cs_info_table
   */
   pthread_mutex_lock(&THR_LOCK_charset);
-
-  cs= all_charsets[cs_number];
-
-  if (cs && !(cs->state & MY_CS_COMPILED) && !(cs->state & MY_CS_LOADED))
+  if ((cs= all_charsets[cs_number]))
   {
-     strxmov(get_charsets_dir(buf), cs->csname, ".xml", NullS);
-     my_read_charset_file(buf,flags);
-     cs= (cs->state & MY_CS_LOADED) ? cs : NULL;
+    if (!(cs->state & MY_CS_COMPILED) && !(cs->state & MY_CS_LOADED))
+    {
+      strxmov(get_charsets_dir(buf), cs->csname, ".xml", NullS);
+      my_read_charset_file(buf,flags);
+    }
+    cs= (cs->state & MY_CS_AVAILABLE) ? cs : NULL;
   }
   pthread_mutex_unlock(&THR_LOCK_charset);
   return cs;