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Fix for BUG#51716 and BUG#51787.

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In BUG#51787 we were using the wrong charset to print out the
data. We were using the field charset for the string that would
hold the information. This caused the assertion, because the
string length was not aligned with UTF32 bytes requirements for
storage.

We fix this by using &my_charset_latin1 in the string object
instead of the field->charset(). As a side-effect, we needed to
extend the show_sql_type interface so that it took the field
charset is now passed as a parameter, so that one is able to
calculate the correct field size.

In BUG#51716 we had issues with Field_string::pack and
Field_string::unpack. When packing, the length was incorrectly
calculated. When unpacking, the padding the string would be
padded with the wrong bytes (a few bytes less than it should).

We fix this by resorting to charset abstractions (functions) that
calculate the correct length when packing and pad correctly the
string when unpacking.
This commit is contained in:
Luis Soares
2010-03-10 17:33:51 +00:00
parent 9c6482afc6
commit 2c368f050e
4 changed files with 120 additions and 11 deletions
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5
sql/field.cc
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@ -6613,8 +6613,7 @@ uchar *Field_string::pack(uchar *to, const uchar *from,
local_char_length= my_charpos(field_charset, from, from+length,
local_char_length);
set_if_smaller(length, local_char_length);
while (length && from[length-1] == field_charset->pad_char)
length--;
length= field_charset->cset->lengthsp(field_charset, (const char*) from, length);
// Length always stored little-endian
*to++= (uchar) length;
@ -6680,7 +6679,7 @@ Field_string::unpack(uchar *to,
memcpy(to, from, length);
// Pad the string with the pad character of the fields charset
bfill(to + length, field_length - length, field_charset->pad_char);
field_charset->cset->fill(field_charset, (char*) to + length, field_length - length, field_charset->pad_char);
return from+length;
}