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Bug#20095 Changing length of VARCHAR field with UTF8 collation does not truncate values

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Problem: single byte do_varstring1() function was called, which didn't
check limit on "number of character", and checked only "number of bytes".
Fix: adding a multi-byte aware function do_varstring1_mb(),
to limit on "number of characters"
This commit is contained in:
bar@mysql.com
2007-04-13 10:05:55 +05:00
parent cec17aa0ba
commit be8fc46db6
5 changed files with 181 additions and 2 deletions
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32
sql/field_conv.cc
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@ -434,6 +434,26 @@ static void do_varstring1(Copy_field *copy)
}
static void do_varstring1_mb(Copy_field *copy)
{
int well_formed_error;
CHARSET_INFO *cs= copy->from_field->charset();
uint from_length= (uint) *(uchar*) copy->from_ptr;
const char *from_ptr= copy->from_ptr + 1;
uint to_char_length= (copy->to_length - 1) / cs->mbmaxlen;
uint length= cs->cset->well_formed_len(cs, from_ptr, from_ptr + from_length,
to_char_length, &well_formed_error);
if (length < from_length)
{
if (current_thd->count_cuted_fields)
copy->to_field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,
WARN_DATA_TRUNCATED, 1);
}
*(uchar*) copy->to_ptr= (uchar) length;
memcpy(copy->to_ptr + 1, from_ptr, length);
}
static void do_varstring2(Copy_field *copy)
{
uint length=uint2korr(copy->from_ptr);
@ -459,6 +479,12 @@ static void do_varstring2_mb(Copy_field *copy)
const char *from_beg= copy->from_ptr + HA_KEY_BLOB_LENGTH;
uint length= cs->cset->well_formed_len(cs, from_beg, from_beg + from_length,
char_length, &well_formed_error);
if (length < from_length)
{
if (current_thd->count_cuted_fields)
copy->to_field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,
WARN_DATA_TRUNCATED, 1);
}
int2store(copy->to_ptr, length);
memcpy(copy->to_ptr+HA_KEY_BLOB_LENGTH, from_beg, length);
}
@ -634,8 +660,10 @@ void (*Copy_field::get_copy_func(Field *to,Field *from))(Copy_field*)
return do_field_string;
if (to_length != from_length)
return (((Field_varstring*) to)->length_bytes == 1 ?
do_varstring1 : (from->charset()->mbmaxlen == 1 ?
do_varstring2 : do_varstring2_mb));
(from->charset()->mbmaxlen == 1 ? do_varstring1 :
do_varstring1_mb) :
(from->charset()->mbmaxlen == 1 ? do_varstring2 :
do_varstring2_mb));
}
else if (to_length < from_length)
return (from->charset()->mbmaxlen == 1 ?