Bug#11338 Fixes from review (identical functionality).

include/my_sys.h:
  Fixes from review (use version in log_event.cc instead)
mysql-test/r/ctype_cp932.result:
  Updated test for bug#11338 (logging of prepared statement w/ blob type)
mysql-test/t/ctype_cp932.test:
  udpated test for bug#11338 (logging of prepared statement w/ blob type)
mysys/charset.c:
  Fixes from review (use version in log_event.cc instead)
sql/item.cc:
  Fixes from review (store character_set_client differently so that
  fix can be merged forward to 5.0)
sql/item.h:
  Fixes from review
sql/log_event.cc:
  Fixes from review, str_to_hex is now used by item.cc
sql/log_event.h:
  Added prototype for str_to_hex (now used by item.cc)
sql/sql_prepare.cc:
  Fixes from review, store character_set_client differently so that 
  Item_param::query_val_str can use it.

include/my_sys.h

@@ -788,7 +788,6 @@ extern my_bool init_compiled_charsets(myf flags);
 extern void add_compiled_collation(CHARSET_INFO *cs);
 extern ulong escape_string_for_mysql(CHARSET_INFO *charset_info, char *to,
                                      const char *from, ulong length);
-extern char *bare_str_to_hex(char *to, const char *from, uint len);
 #ifdef __WIN__
 #define BACKSLASH_MBTAIL
 /* File system character set */

mysql-test/r/ctype_cp932.result

@@ -8576,6 +8576,20 @@ FC4B
 DROP TABLE t1;
 DROP TABLE t2;
 DROP TABLE t3;
+CREATE TABLE t1(f1 blob);
+PREPARE stmt1 FROM 'INSERT INTO t1 VALUES(?)';
+SET @var1= x'8300';
+EXECUTE stmt1 USING @var1;
+SHOW BINLOG EVENTS FROM 27642;
+Log_name	Pos	Event_type	Server_id	Orig_log_pos	Info
+master-bin.000001	27642	Query	1	27642	use `test`; CREATE TABLE t1(f1 blob)
+master-bin.000001	27701	Query	1	27701	use `test`; SET ONE_SHOT CHARACTER_SET_CLIENT=95,COLLATION_CONNECTION=95,COLLATION_DATABASE=95,COLLATION_SERVER=8
+master-bin.000001	27837	User var	1	27837	@`var1`=_binary 0x8300 COLLATE binary
+master-bin.000001	27876	Query	1	27876	use `test`; INSERT INTO t1 VALUES(@'var1')
+SELECT HEX(f1) FROM t1;
+HEX(f1)
+8300
+DROP table t1;
 SET collation_connection='cp932_japanese_ci';
 create table t1 select repeat('a',4000) a;
 delete from t1;

mysql-test/t/ctype_cp932.test

@@ -401,6 +401,26 @@ DROP TABLE t2;
 DROP TABLE t3;
 #DROP TABLE t4;
 
+# Test prepared statement with 0x8300 sequence in parameter while
+# running with cp932 client character set.
+CREATE TABLE t1(f1 blob);
+PREPARE stmt1 FROM 'INSERT INTO t1 VALUES(?)';
+SET @var1= x'8300';
+# TODO: Note that this doesn't actually test the code which was added for
+# bug#11338 because this syntax for prepared statements causes the PS to
+# be replicated differently than if we executed the PS from C or Java.
+# Using this syntax, variable names are inserted into the binlog instead
+# of values. The real goal of this test is to check the code that was
+# added to Item_param::query_val_str() in order to do hex encoding of
+# PS parameters when the client character set is cp932;
+# Bug#11338 has an example java program which can be used to verify this 
+# code (and I have used it to test the fix) until there is some way to
+# exercise this code from mysql-test-run.
+EXECUTE stmt1 USING @var1;
+SHOW BINLOG EVENTS FROM 27642;
+SELECT HEX(f1) FROM t1;
+DROP table t1;
+# end test for bug#11338
 
 SET collation_connection='cp932_japanese_ci';
 -- source include/ctype_filesort.inc

mysys/charset.c

@@ -663,21 +663,3 @@ CHARSET_INFO *fs_character_set()
   return fs_cset_cache;
 }
 #endif
-
-/*
-  Transforms a string into hex form.
- */
-char *bare_str_to_hex(char *to, const char *from, uint len)
-{
-  char *p= to;
-  uint i;
-  for (i= 0; i < len; i++, p+= 2)
-  {
-    /* val[i] is char. Casting to uchar helps greatly if val[i] < 0 */
-    uint tmp= (uint) (uchar) from[i];
-    p[0]= _dig_vec_upper[tmp >> 4];
-    p[1]= _dig_vec_upper[tmp & 15];
-  }
-  *p= 0;
-  return p; // pointer to end 0 of 'to'
-}

sql/item.cc

@@ -1230,7 +1230,7 @@ bool Item_param::set_from_user_var(THD *thd, const user_var_entry *entry)
       CHARSET_INFO *tocs= thd->variables.collation_connection;
       uint32 dummy_offset;
 
-      value.cs_info.character_set_client= fromcs;
+      value.cs_info.character_set_of_placeholder= fromcs;
       /*
         Setup source and destination character sets so that they
         are different only if conversion is necessary: this will
@@ -1443,7 +1443,7 @@ String *Item_param::val_str(String* str)
   and avoid one more memcpy/alloc between str and log string.
 */
 
-const String *Item_param::query_val_str(String* str, THD *thd) const
+const String *Item_param::query_val_str(String* str) const
 {
   switch (state) {
   case INT_VALUE:
@@ -1482,18 +1482,17 @@ const String *Item_param::query_val_str(String* str, THD *thd) const
 
       buf= str->c_ptr_quick();
       ptr= buf;
-      if (thd->charset()->escape_with_backslash_is_dangerous)
+      if (value.cs_info.character_set_client->escape_with_backslash_is_dangerous)
       {
-        ptr= strmov(ptr, "x\'");
+        ptr= str_to_hex(ptr, str_value.ptr(), str_value.length());
-        ptr= bare_str_to_hex(ptr, str_value.ptr(), str_value.length());
       }
       else
       {
         *ptr++= '\'';
         ptr+= escape_string_for_mysql(str_value.charset(), ptr,
                                       str_value.ptr(), str_value.length());
+        *ptr++='\'';
       }
-      *ptr++='\'';
       str->length(ptr - buf);
       break;
     }
@@ -1523,10 +1522,10 @@ bool Item_param::convert_str_value(THD *thd)
       here only if conversion is really necessary.
     */
     if (value.cs_info.final_character_set_of_str_value !=
-        value.cs_info.character_set_client)
+        value.cs_info.character_set_of_placeholder)
     {
       rc= thd->convert_string(&str_value,
-                              value.cs_info.character_set_client,
+                              value.cs_info.character_set_of_placeholder,
                               value.cs_info.final_character_set_of_str_value);
     }
     else

sql/item.h

@@ -532,6 +532,7 @@ public:
     struct CONVERSION_INFO
     {
       CHARSET_INFO *character_set_client;
+      CHARSET_INFO *character_set_of_placeholder;
       /*
         This points at character set of connection if conversion
         to it is required (i. e. if placeholder typecode is not BLOB).
@@ -591,7 +592,7 @@ public:
   */
   void (*set_param_func)(Item_param *param, uchar **pos, ulong len);
 
-  const String *query_val_str(String *str, THD *thd) const;
+  const String *query_val_str(String *str) const;
 
   bool convert_str_value(THD *thd);
 

sql/log_event.cc

@@ -207,7 +207,7 @@ static inline int read_str(char * &buf, char *buf_end, char * &str,
 /*
   Transforms a string into "" or its expression in 0x... form.
 */
-static char *str_to_hex(char *to, char *from, uint len)
+char *str_to_hex(char *to, const char *from, uint len)
 {
   char *p= to;
   if (len)

sql/log_event.h

@@ -1069,5 +1069,5 @@ public:
   bool is_valid() { return 1; }
 };
 #endif  
-
+char *str_to_hex(char *to, const char *from, uint len);
 #endif /* _log_event_h */

sql/sql_prepare.cc

@@ -528,7 +528,9 @@ static void setup_one_conversion_function(THD *thd, Item_param *param,
   case MYSQL_TYPE_LONG_BLOB:
   case MYSQL_TYPE_BLOB:
     param->set_param_func= set_param_str;
-    param->value.cs_info.character_set_client= &my_charset_bin;
+    param->value.cs_info.character_set_of_placeholder= &my_charset_bin;
+    param->value.cs_info.character_set_client=
+      thd->variables.character_set_client;
     param->value.cs_info.final_character_set_of_str_value= &my_charset_bin;
     param->item_type= Item::STRING_ITEM;
     param->item_result_type= STRING_RESULT;
@@ -544,6 +546,7 @@ static void setup_one_conversion_function(THD *thd, Item_param *param,
       CHARSET_INFO *tocs= thd->variables.collation_connection;
       uint32 dummy_offset;
 
+      param->value.cs_info.character_set_of_placeholder= fromcs;
       param->value.cs_info.character_set_client= fromcs;
 
       /*
@@ -601,7 +604,7 @@ static bool insert_params_withlog(Prepared_statement *stmt, uchar *null_array,
         param->set_param_func(param, &read_pos, data_end - read_pos);
       }
     }
-    res= param->query_val_str(&str, thd);
+    res= param->query_val_str(&str);
     if (param->convert_str_value(thd))
       DBUG_RETURN(1);                           /* out of memory */
 
@@ -749,7 +752,7 @@ static bool emb_insert_params_withlog(Prepared_statement *stmt, String *query)
                               client_param->buffer_length);
       }
     }
-    res= param->query_val_str(&str, thd);
+    res= param->query_val_str(&str);
     if (param->convert_str_value(thd))
       DBUG_RETURN(1);                           /* out of memory */