/*****************************************************************************

Copyright (c) 1996, 2011, Oracle and/or its affiliates. All Rights Reserved.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.

This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation.  The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
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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, version 2.0, 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 Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/**************************************************//**
@file data/data0type.cc
Data types

Created 1/16/1996 Heikki Tuuri
*******************************************************/

#include "data0type.h"

#ifdef UNIV_NONINL
#include "data0type.ic"
#endif

#ifndef UNIV_HOTBACKUP
# include "ha_prototypes.h"

/* At the database startup we store the default-charset collation number of
this MySQL installation to this global variable. If we have < 4.1.2 format
column definitions, or records in the insert buffer, we use this
charset-collation code for them. */

UNIV_INTERN ulint	data_mysql_default_charset_coll;

/*********************************************************************//**
Determine how many bytes the first n characters of the given string occupy.
If the string is shorter than n characters, returns the number of bytes
the characters in the string occupy.
@return	length of the prefix, in bytes */
UNIV_INTERN
ulint
dtype_get_at_most_n_mbchars(
/*========================*/
	ulint		prtype,		/*!< in: precise type */
	ulint		mbminmaxlen,	/*!< in: minimum and maximum length of
					a multi-byte character */
	ulint		prefix_len,	/*!< in: length of the requested
					prefix, in characters, multiplied by
					dtype_get_mbmaxlen(dtype) */
	ulint		data_len,	/*!< in: length of str (in bytes) */
	const char*	str)		/*!< in: the string whose prefix
					length is being determined */
{
	ulint	mbminlen = DATA_MBMINLEN(mbminmaxlen);
	ulint	mbmaxlen = DATA_MBMAXLEN(mbminmaxlen);

	ut_a(data_len != UNIV_SQL_NULL);
	ut_ad(!mbmaxlen || !(prefix_len % mbmaxlen));

	if (mbminlen != mbmaxlen) {
		ut_a(!(prefix_len % mbmaxlen));
		return(innobase_get_at_most_n_mbchars(
			dtype_get_charset_coll(prtype),
			prefix_len, data_len, str));
	}

	if (prefix_len < data_len) {

		return(prefix_len);

	}

	return(data_len);
}
#endif /* UNIV_HOTBACKUP */

/*********************************************************************//**
Checks if a data main type is a string type. Also a BLOB is considered a
string type.
@return	TRUE if string type */
UNIV_INTERN
ibool
dtype_is_string_type(
/*=================*/
	ulint	mtype)	/*!< in: InnoDB main data type code: DATA_CHAR, ... */
{
	if (mtype <= DATA_BLOB
	    || mtype == DATA_MYSQL
	    || mtype == DATA_VARMYSQL) {

		return(TRUE);
	}

	return(FALSE);
}

/*********************************************************************//**
Checks if a type is a binary string type. Note that for tables created with
< 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column. For
those DATA_BLOB columns this function currently returns FALSE.
@return	TRUE if binary string type */
UNIV_INTERN
ibool
dtype_is_binary_string_type(
/*========================*/
	ulint	mtype,	/*!< in: main data type */
	ulint	prtype)	/*!< in: precise type */
{
	if ((mtype == DATA_FIXBINARY)
	    || (mtype == DATA_BINARY)
	    || (mtype == DATA_BLOB && (prtype & DATA_BINARY_TYPE))) {

		return(TRUE);
	}

	return(FALSE);
}

/*********************************************************************//**
Checks if a type is a non-binary string type. That is, dtype_is_string_type is
TRUE and dtype_is_binary_string_type is FALSE. Note that for tables created
with < 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column.
For those DATA_BLOB columns this function currently returns TRUE.
@return	TRUE if non-binary string type */
UNIV_INTERN
ibool
dtype_is_non_binary_string_type(
/*============================*/
	ulint	mtype,	/*!< in: main data type */
	ulint	prtype)	/*!< in: precise type */
{
	if (dtype_is_string_type(mtype) == TRUE
	    && dtype_is_binary_string_type(mtype, prtype) == FALSE) {

		return(TRUE);
	}

	return(FALSE);
}

/*********************************************************************//**
Forms a precise type from the < 4.1.2 format precise type plus the
charset-collation code.
@return precise type, including the charset-collation code */
UNIV_INTERN
ulint
dtype_form_prtype(
/*==============*/
	ulint	old_prtype,	/*!< in: the MySQL type code and the flags
				DATA_BINARY_TYPE etc. */
	ulint	charset_coll)	/*!< in: MySQL charset-collation code */
{
	ut_a(old_prtype < 256 * 256);
	ut_a(charset_coll <= MAX_CHAR_COLL_NUM);

	return(old_prtype + (charset_coll << 16));
}

/*********************************************************************//**
Validates a data type structure.
@return	TRUE if ok */
UNIV_INTERN
ibool
dtype_validate(
/*===========*/
	const dtype_t*	type)	/*!< in: type struct to validate */
{
	ut_a(type);
	ut_a(type->mtype >= DATA_VARCHAR);
	ut_a(type->mtype <= DATA_MYSQL);

	if (type->mtype == DATA_SYS) {
		ut_a((type->prtype & DATA_MYSQL_TYPE_MASK) < DATA_N_SYS_COLS);
	}

#ifndef UNIV_HOTBACKUP
	ut_a(dtype_get_mbminlen(type) <= dtype_get_mbmaxlen(type));
#endif /* !UNIV_HOTBACKUP */

	return(TRUE);
}

#ifndef UNIV_HOTBACKUP
/*********************************************************************//**
Prints a data type structure. */
UNIV_INTERN
void
dtype_print(
/*========*/
	const dtype_t*	type)	/*!< in: type */
{
	ulint	mtype;
	ulint	prtype;
	ulint	len;

	ut_a(type);

	mtype = type->mtype;
	prtype = type->prtype;

	switch (mtype) {
	case DATA_VARCHAR:
		fputs("DATA_VARCHAR", stderr);
		break;

	case DATA_CHAR:
		fputs("DATA_CHAR", stderr);
		break;

	case DATA_BINARY:
		fputs("DATA_BINARY", stderr);
		break;

	case DATA_FIXBINARY:
		fputs("DATA_FIXBINARY", stderr);
		break;

	case DATA_BLOB:
		fputs("DATA_BLOB", stderr);
		break;

	case DATA_INT:
		fputs("DATA_INT", stderr);
		break;

	case DATA_MYSQL:
		fputs("DATA_MYSQL", stderr);
		break;

	case DATA_SYS:
		fputs("DATA_SYS", stderr);
		break;

	case DATA_FLOAT:
		fputs("DATA_FLOAT", stderr);
		break;

	case DATA_DOUBLE:
		fputs("DATA_DOUBLE", stderr);
		break;

	case DATA_DECIMAL:
		fputs("DATA_DECIMAL", stderr);
		break;

	case DATA_VARMYSQL:
		fputs("DATA_VARMYSQL", stderr);
		break;

	default:
		fprintf(stderr, "type %lu", (ulong) mtype);
		break;
	}

	len = type->len;

	if ((type->mtype == DATA_SYS)
	    || (type->mtype == DATA_VARCHAR)
	    || (type->mtype == DATA_CHAR)) {
		putc(' ', stderr);
		if (prtype == DATA_ROW_ID) {
			fputs("DATA_ROW_ID", stderr);
			len = DATA_ROW_ID_LEN;
		} else if (prtype == DATA_ROLL_PTR) {
			fputs("DATA_ROLL_PTR", stderr);
			len = DATA_ROLL_PTR_LEN;
		} else if (prtype == DATA_TRX_ID) {
			fputs("DATA_TRX_ID", stderr);
			len = DATA_TRX_ID_LEN;
		} else if (prtype == DATA_ENGLISH) {
			fputs("DATA_ENGLISH", stderr);
		} else {
			fprintf(stderr, "prtype %lu", (ulong) prtype);
		}
	} else {
		if (prtype & DATA_UNSIGNED) {
			fputs(" DATA_UNSIGNED", stderr);
		}

		if (prtype & DATA_BINARY_TYPE) {
			fputs(" DATA_BINARY_TYPE", stderr);
		}

		if (prtype & DATA_NOT_NULL) {
			fputs(" DATA_NOT_NULL", stderr);
		}
	}

	fprintf(stderr, " len %lu", (ulong) len);
}
#endif /* !UNIV_HOTBACKUP */
