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/* Copyright (c) 2019 MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifndef SQL_TYPE_STRING_INCLUDED
#define SQL_TYPE_STRING_INCLUDED
class StringPack
{
CHARSET_INFO *m_cs;
uint32 m_octet_length;
CHARSET_INFO *charset() const { return m_cs; }
uint mbmaxlen() const { return m_cs->mbmaxlen; };
uint32 char_length() const { return m_octet_length / mbmaxlen(); }
public:
StringPack(CHARSET_INFO *cs, uint32 octet_length)
:m_cs(cs),
m_octet_length(octet_length)
{ }
uchar *pack(uchar *to, const uchar *from, uint max_length) const;
const uchar *unpack(uchar *to, const uchar *from, const uchar *from_end,
uint param_data) const;
public:
static uint max_packed_col_length(uint max_length)
{
return (max_length > 255 ? 2 : 1) + max_length;
}
static uint packed_col_length(const uchar *data_ptr, uint length)
{
if (length > 255)
return uint2korr(data_ptr)+2;
return (uint) *data_ptr + 1;
}
};
#endif // SQL_TYPE_STRING_INCLUDED
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