BUG#11338 (logging of prepared statement w/ blob type)

In cp932, '\' character can be the second byte in a 
multi-byte character stream. This makes it difficult to use
mysql_escape_string. Added flag to indicate which languages allow
'\' as second byte of multibyte sequence so that when putting a prepared
statement into the binlog we can decide at runtime whether hex encoding
is really needed.


include/m_ctype.h:
  Added bool to indicate character sets which allow '\' as the second
  byte of a multibyte character set (currently only cp932). For these
  character sets, escaping with '\' is dangerous and leads to corruption
  in replication.
include/my_sys.h:
  Add function to enocde a string as hex with no prefix (bare)
mysys/charset.c:
  Add function to encode string as hex with no prefix (bare).
sql/item.cc:
  Check the connection character set to see if escape_string_for_mysql
  is safe, or if character set requires unambiguous (hex) encoding
sql/item.h:
  Pass thd to query_val_str for access to charset()
sql/sql_prepare.cc:
  Pass thd to query_val_str.
strings/ctype-big5.c:
  Add escape_with_backslash_is_dangerous flag.
strings/ctype-bin.c:
  Add escape_with_backslash_is_dangerous flag
strings/ctype-cp932.c:
  Add escape_with_backslash_is_dangerous flag.
strings/ctype-czech.c:
  Add escape_with_backslash_is_dangerous flag.
strings/ctype-euc_kr.c:
  Add escape_with_backslash_is_dangerous flag.
strings/ctype-extra.c:
  Add escape_with_backslash_is_dangerous flag.
strings/ctype-gb2312.c:
  Add escape_with_backslash_is_dangerous flag.
strings/ctype-gbk.c:
  Added escape_with_backslash_is_dangerous flag.
strings/ctype-latin1.c:
  Added escape_with_backslash_is_dangerous flag.
strings/ctype-sjis.c:
  Added escape_with_backslash_is_dangerous flag.
strings/ctype-tis620.c:
  Added esacpe_with_backslash_character_is_dangerous flag.
strings/ctype-uca.c:
  Added escape_with_backslash_is_dangerous flag.
strings/ctype-ucs2.c:
  Added escape_with_backslash_is_dangerous.
strings/ctype-ujis.c:
  Added escape_with_backslash_is_dangerous flag.
strings/ctype-utf8.c:
  Added escape_with_backslash_is_dangerous.
strings/ctype-win1250ch.c:
  Added escape_with_backslash_is_dangerous.

1 files changed, 18 insertions, 0 deletions

diff --git a/mysys/charset.c b/mysys/charset.c
index 3a39fce9437..df3f1cfa279 100644
--- a/mysys/charset.c
+++ b/mysys/charset.c
@@ -663,3 +663,21 @@ 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'
+}