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UCS-2 aligning 0xAA -> 0x00AA

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This commit is contained in:
bar@bar.intranet.mysql.r18.ru
2004-01-19 19:16:30 +04:00
parent 81ef764e2c
commit f802ec0215
21 changed files with 148 additions and 4 deletions
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46
sql/sql_string.cc
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@ -228,6 +228,52 @@ bool String::copy(const char *str,uint32 arg_length, CHARSET_INFO *cs)
return FALSE;
}
/*
** For real multi-byte, ascii incompatible charactser sets,
** like UCS-2, add leading zeros if we have an incomplete character.
** Thus,
** SELECT _ucs2 0xAA
** will automatically be converted into
** SELECT _ucs2 0x00AA
*/
bool String::set_or_copy_aligned(const char *str,uint32 arg_length,
CHARSET_INFO *cs)
{
/* How many bytes are in incomplete character */
uint32 offs= (arg_length % cs->mbminlen);
if (!offs) /* All characters are complete, just copy */
{
set(str, arg_length, cs);
return FALSE;
}
offs= cs->mbmaxlen - offs; /* How many zeros we should prepend */
uint32 aligned_length= arg_length + offs;
if (alloc(aligned_length))
return TRUE;
/*
Probably this condition is not really necessary
because if aligned_length is 0 then offs is 0 too
and we'll return after calling set().
*/
if ((str_length= aligned_length))
{
/*
Note, this is only safe for little-endian UCS-2.
If we add big-endian UCS-2 sometimes, this code
will be more complicated. But it's OK for now.
*/
bzero((char*)Ptr, offs);
memcpy(Ptr + offs, str, arg_length);
}
Ptr[aligned_length]=0;
str_charset=cs;
return FALSE;
}
/* Copy with charset convertion */
bool String::copy(const char *str, uint32 arg_length,