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

Copyright (c) 1996, 2023, Oracle and/or its affiliates.

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
separately licensed software that they have included with MySQL.

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 include/data0type.ic
Data types

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

#include "mach0data.h"
#ifndef UNIV_HOTBACKUP
# include "ha_prototypes.h"

/*********************************************************************//**
Gets the MySQL charset-collation code for MySQL string types.
@return MySQL charset-collation code */
UNIV_INLINE
ulint
dtype_get_charset_coll(
/*===================*/
	ulint	prtype)	/*!< in: precise data type */
{
	return((prtype >> 16) & CHAR_COLL_MASK);
}

/*********************************************************************//**
Determines if a MySQL string type is a subset of UTF-8.  This function
may return false negatives, in case further character-set collation
codes are introduced in MySQL later.
@return TRUE if a subset of UTF-8 */
UNIV_INLINE
ibool
dtype_is_utf8(
/*==========*/
	ulint	prtype)	/*!< in: precise data type */
{
	/* These codes have been copied from strings/ctype-extra.c
	and strings/ctype-utf8.c. */
	switch (dtype_get_charset_coll(prtype)) {
	case 11: /* ascii_general_ci */
	case 65: /* ascii_bin */
	case 33: /* utf8_general_ci */
	case 83: /* utf8_bin */
	case 254: /* utf8_general_cs */
			return(TRUE);
	}

	return(FALSE);
}

/*********************************************************************//**
Gets the MySQL type code from a dtype.
@return MySQL type code; this is NOT an InnoDB type code! */
UNIV_INLINE
ulint
dtype_get_mysql_type(
/*=================*/
	const dtype_t*	type)	/*!< in: type struct */
{
	return(type->prtype & 0xFFUL);
}

/*********************************************************************//**
Compute the mbminlen and mbmaxlen members of a data type structure. */
UNIV_INLINE
void
dtype_get_mblen(
/*============*/
	ulint	mtype,		/*!< in: main type */
	ulint	prtype,		/*!< in: precise type (and collation) */
	ulint*	mbminlen,	/*!< out: minimum length of a
				multi-byte character */
	ulint*	mbmaxlen)	/*!< out: maximum length of a
				multi-byte character */
{
	if (dtype_is_string_type(mtype)) {
		innobase_get_cset_width(dtype_get_charset_coll(prtype),
					mbminlen, mbmaxlen);
		ut_ad(*mbminlen <= *mbmaxlen);
		ut_ad(*mbminlen < DATA_MBMAX);
		ut_ad(*mbmaxlen < DATA_MBMAX);
	} else {
		*mbminlen = *mbmaxlen = 0;
	}
}

/*********************************************************************//**
Sets the minimum and maximum length of a character, in bytes. */
UNIV_INLINE
void
dtype_set_mbminmaxlen(
/*==================*/
	dtype_t*	type,		/*!< in/out: type */
	ulint		mbminlen,	/*!< in: minimum length of a char,
					in bytes, or 0 if this is not
					a character type */
	ulint		mbmaxlen)	/*!< in: maximum length of a char,
					in bytes, or 0 if this is not
					a character type */
{
	ut_ad(mbminlen < DATA_MBMAX);
	ut_ad(mbmaxlen < DATA_MBMAX);
	ut_ad(mbminlen <= mbmaxlen);

	type->mbminmaxlen = DATA_MBMINMAXLEN(mbminlen, mbmaxlen);
}

/*********************************************************************//**
Compute the mbminlen and mbmaxlen members of a data type structure. */
UNIV_INLINE
void
dtype_set_mblen(
/*============*/
	dtype_t*	type)	/*!< in/out: type */
{
	ulint	mbminlen;
	ulint	mbmaxlen;

	dtype_get_mblen(type->mtype, type->prtype, &mbminlen, &mbmaxlen);
	dtype_set_mbminmaxlen(type, mbminlen, mbmaxlen);

	ut_ad(dtype_validate(type));
}
#else /* !UNIV_HOTBACKUP */
# define dtype_set_mblen(type) (void) 0
#endif /* !UNIV_HOTBACKUP */

/*********************************************************************//**
Sets a data type structure. */
UNIV_INLINE
void
dtype_set(
/*======*/
	dtype_t*	type,	/*!< in: type struct to init */
	ulint		mtype,	/*!< in: main data type */
	ulint		prtype,	/*!< in: precise type */
	ulint		len)	/*!< in: precision of type */
{
	ut_ad(type);
	ut_ad(mtype <= DATA_MTYPE_MAX);

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

	dtype_set_mblen(type);
}

/*********************************************************************//**
Copies a data type structure. */
UNIV_INLINE
void
dtype_copy(
/*=======*/
	dtype_t*	type1,	/*!< in: type struct to copy to */
	const dtype_t*	type2)	/*!< in: type struct to copy from */
{
	*type1 = *type2;

	ut_ad(dtype_validate(type1));
}

/*********************************************************************//**
Gets the SQL main data type.
@return SQL main data type */
UNIV_INLINE
ulint
dtype_get_mtype(
/*============*/
	const dtype_t*	type)	/*!< in: data type */
{
	ut_ad(type);

	return(type->mtype);
}

/*********************************************************************//**
Gets the precise data type.
@return precise data type */
UNIV_INLINE
ulint
dtype_get_prtype(
/*=============*/
	const dtype_t*	type)	/*!< in: data type */
{
	ut_ad(type);

	return(type->prtype);
}

/*********************************************************************//**
Gets the type length.
@return fixed length of the type, in bytes, or 0 if variable-length */
UNIV_INLINE
ulint
dtype_get_len(
/*==========*/
	const dtype_t*	type)	/*!< in: data type */
{
	ut_ad(type);

	return(type->len);
}

#ifndef UNIV_HOTBACKUP
/*********************************************************************//**
Gets the minimum length of a character, in bytes.
@return minimum length of a char, in bytes, or 0 if this is not a
character type */
UNIV_INLINE
ulint
dtype_get_mbminlen(
/*===============*/
	const dtype_t*	type)	/*!< in: type */
{
	ut_ad(type);
	return(DATA_MBMINLEN(type->mbminmaxlen));
}
/*********************************************************************//**
Gets the maximum length of a character, in bytes.
@return maximum length of a char, in bytes, or 0 if this is not a
character type */
UNIV_INLINE
ulint
dtype_get_mbmaxlen(
/*===============*/
	const dtype_t*	type)	/*!< in: type */
{
	ut_ad(type);
	return(DATA_MBMAXLEN(type->mbminmaxlen));
}

/**********************************************************************//**
Stores for a type the information which determines its alphabetical ordering
and the storage size of an SQL NULL value. This is the >= 4.1.x storage
format. */
UNIV_INLINE
void
dtype_new_store_for_order_and_null_size(
/*====================================*/
	byte*		buf,	/*!< in: buffer for
				DATA_NEW_ORDER_NULL_TYPE_BUF_SIZE
				bytes where we store the info */
	const dtype_t*	type,	/*!< in: type struct */
	ulint		prefix_len)/*!< in: prefix length to
				replace type->len, or 0 */
{
#if 6 != DATA_NEW_ORDER_NULL_TYPE_BUF_SIZE
#error "6 != DATA_NEW_ORDER_NULL_TYPE_BUF_SIZE"
#endif
	ulint	len;

	ut_ad(type);
	ut_ad(type->mtype >= DATA_VARCHAR);
	ut_ad(type->mtype <= DATA_MTYPE_MAX);

	buf[0] = (byte)(type->mtype & 0xFFUL);

	if (type->prtype & DATA_BINARY_TYPE) {
		buf[0] |= 128;
	}

	/* In versions < 4.1.2 we had:	if (type->prtype & DATA_NONLATIN1) {
	buf[0] |= 64;
	}
	*/

	buf[1] = (byte)(type->prtype & 0xFFUL);

	len = prefix_len ? prefix_len : type->len;

	mach_write_to_2(buf + 2, len & 0xFFFFUL);

	ut_ad(dtype_get_charset_coll(type->prtype) <= MAX_CHAR_COLL_NUM);
	mach_write_to_2(buf + 4, dtype_get_charset_coll(type->prtype));

	if (type->prtype & DATA_NOT_NULL) {
		buf[4] |= 128;
	}
}

/**********************************************************************//**
Reads to a type the stored information which determines its alphabetical
ordering and the storage size of an SQL NULL value. This is the < 4.1.x
storage format. */
UNIV_INLINE
void
dtype_read_for_order_and_null_size(
/*===============================*/
	dtype_t*	type,	/*!< in: type struct */
	const byte*	buf)	/*!< in: buffer for stored type order info */
{
#if 4 != DATA_ORDER_NULL_TYPE_BUF_SIZE
# error "4 != DATA_ORDER_NULL_TYPE_BUF_SIZE"
#endif

	type->mtype = buf[0] & 63;
	type->prtype = buf[1];

	if (buf[0] & 128) {
		type->prtype |= DATA_BINARY_TYPE;
	}

	type->len = mach_read_from_2(buf + 2);

	type->prtype = dtype_form_prtype(type->prtype,
					 data_mysql_default_charset_coll);
	dtype_set_mblen(type);
}

/**********************************************************************//**
Reads to a type the stored information which determines its alphabetical
ordering and the storage size of an SQL NULL value. This is the >= 4.1.x
storage format. */
UNIV_INLINE
void
dtype_new_read_for_order_and_null_size(
/*===================================*/
	dtype_t*	type,	/*!< in: type struct */
	const byte*	buf)	/*!< in: buffer for stored type order info */
{
	ulint	charset_coll;

#if 6 != DATA_NEW_ORDER_NULL_TYPE_BUF_SIZE
#error "6 != DATA_NEW_ORDER_NULL_TYPE_BUF_SIZE"
#endif

	type->mtype = buf[0] & 63;
	type->prtype = buf[1];

	if (buf[0] & 128) {
		type->prtype |= DATA_BINARY_TYPE;
	}

	if (buf[4] & 128) {
		type->prtype |= DATA_NOT_NULL;
	}

	type->len = mach_read_from_2(buf + 2);

	charset_coll = mach_read_from_2(buf + 4) & CHAR_COLL_MASK;

	if (dtype_is_string_type(type->mtype)) {
		ut_a(charset_coll <= MAX_CHAR_COLL_NUM);

		if (charset_coll == 0) {
			/* This insert buffer record was inserted with MySQL
			version < 4.1.2, and the charset-collation code was not
			explicitly stored to dtype->prtype at that time. It
			must be the default charset-collation of this MySQL
			installation. */

			charset_coll = data_mysql_default_charset_coll;
		}

		type->prtype = dtype_form_prtype(type->prtype, charset_coll);
	}
	dtype_set_mblen(type);
}

/*********************************************************************//**
Returns the type's SQL name (e.g. BIGINT UNSIGNED) from mtype,prtype,len
@return the SQL type name */
UNIV_INLINE
char*
dtype_sql_name(
/*===========*/
	unsigned	mtype,	/*!< in: mtype */
	unsigned	prtype,	/*!< in: prtype */
	unsigned	len,	/*!< in: len */
	char*		name,	/*!< out: SQL name */
	unsigned	name_sz)/*!< in: size of the name buffer */
{

#define APPEND_UNSIGNED()					\
	do {							\
		if (prtype & DATA_UNSIGNED) {			\
			ut_snprintf(name + strlen(name),	\
				    name_sz - strlen(name),	\
				    " UNSIGNED");		\
		}						\
	} while (0)

	ut_snprintf(name, name_sz, "UNKNOWN");

	switch (mtype) {
	case DATA_INT:
		switch (len) {
		case 1:
			ut_snprintf(name, name_sz, "TINYINT");
			break;
		case 2:
			ut_snprintf(name, name_sz, "SMALLINT");
			break;
		case 3:
			ut_snprintf(name, name_sz, "MEDIUMINT");
			break;
		case 4:
			ut_snprintf(name, name_sz, "INT");
			break;
		case 8:
			ut_snprintf(name, name_sz, "BIGINT");
			break;
		}
		APPEND_UNSIGNED();
		break;
	case DATA_FLOAT:
		ut_snprintf(name, name_sz, "FLOAT");
		APPEND_UNSIGNED();
		break;
	case DATA_DOUBLE:
		ut_snprintf(name, name_sz, "DOUBLE");
		APPEND_UNSIGNED();
		break;
	case DATA_FIXBINARY:
		ut_snprintf(name, name_sz, "BINARY(%u)", len);
		break;
	case DATA_CHAR:
	case DATA_MYSQL:
		ut_snprintf(name, name_sz, "CHAR(%u)", len);
		break;
	case DATA_VARCHAR:
	case DATA_VARMYSQL:
		ut_snprintf(name, name_sz, "VARCHAR(%u)", len);
		break;
	case DATA_BINARY:
		ut_snprintf(name, name_sz, "VARBINARY(%u)", len);
		break;
	case DATA_GEOMETRY:
		ut_snprintf(name, name_sz, "GEOMETRY");
		break;
	case DATA_BLOB:
		switch (len) {
		case 9:
			ut_snprintf(name, name_sz, "TINYBLOB");
			break;
		case 10:
			ut_snprintf(name, name_sz, "BLOB");
			break;
		case 11:
			ut_snprintf(name, name_sz, "MEDIUMBLOB");
			break;
		case 12:
			ut_snprintf(name, name_sz, "LONGBLOB");
			break;
		}
	}

	if (prtype & DATA_NOT_NULL) {
		ut_snprintf(name + strlen(name),
			    name_sz - strlen(name),
			    " NOT NULL");
	}

	return(name);
}

#endif /* !UNIV_HOTBACKUP */

/***********************************************************************//**
Returns the size of a fixed size data type, 0 if not a fixed size type.
@return fixed size, or 0 */
UNIV_INLINE
ulint
dtype_get_fixed_size_low(
/*=====================*/
	ulint	mtype,		/*!< in: main type */
	ulint	prtype,		/*!< in: precise type */
	ulint	len,		/*!< in: length */
	ulint	mbminmaxlen,	/*!< in: minimum and maximum length of
				a multibyte character, in bytes */
	ulint	comp)		/*!< in: nonzero=ROW_FORMAT=COMPACT  */
{
	switch (mtype) {
	case DATA_SYS:
#ifdef UNIV_DEBUG
		switch (prtype & DATA_MYSQL_TYPE_MASK) {
		case DATA_ROW_ID:
			ut_ad(len == DATA_ROW_ID_LEN);
			break;
		case DATA_TRX_ID:
			ut_ad(len == DATA_TRX_ID_LEN);
			break;
		case DATA_ROLL_PTR:
			ut_ad(len == DATA_ROLL_PTR_LEN);
			break;
		default:
			ut_ad(0);
			return(0);
		}
#endif /* UNIV_DEBUG */
	// Fall through.
	case DATA_CHAR:
	case DATA_FIXBINARY:
	case DATA_INT:
	case DATA_FLOAT:
	case DATA_DOUBLE:
	case DATA_POINT:
		return(len);
	case DATA_MYSQL:
#ifndef UNIV_HOTBACKUP
		if (prtype & DATA_BINARY_TYPE) {
			return(len);
		} else if (!comp) {
			return(len);
		} else {
#ifdef UNIV_DEBUG
			ulint	i_mbminlen, i_mbmaxlen;

			innobase_get_cset_width(
				dtype_get_charset_coll(prtype),
				&i_mbminlen, &i_mbmaxlen);

			ut_ad(DATA_MBMINMAXLEN(i_mbminlen, i_mbmaxlen)
			      == mbminmaxlen);
#endif /* UNIV_DEBUG */
			if (DATA_MBMINLEN(mbminmaxlen)
			    == DATA_MBMAXLEN(mbminmaxlen)) {
				return(len);
			}
		}
#else /* !UNIV_HOTBACKUP */
		return(len);
#endif /* !UNIV_HOTBACKUP */
		/* fall through for variable-length charsets */
	case DATA_VARCHAR:
	case DATA_BINARY:
	case DATA_DECIMAL:
	case DATA_VARMYSQL:
	case DATA_VAR_POINT:
	case DATA_GEOMETRY:
	case DATA_BLOB:
		return(0);
	default:
		ut_error;
	}

	return(0);
}

#ifndef UNIV_HOTBACKUP
/***********************************************************************//**
Returns the minimum size of a data type.
@return minimum size */
UNIV_INLINE
ulint
dtype_get_min_size_low(
/*===================*/
	ulint	mtype,		/*!< in: main type */
	ulint	prtype,		/*!< in: precise type */
	ulint	len,		/*!< in: length */
	ulint	mbminmaxlen)	/*!< in: minimum and maximum length of a
				multi-byte character */
{
	switch (mtype) {
	case DATA_SYS:
#ifdef UNIV_DEBUG
		switch (prtype & DATA_MYSQL_TYPE_MASK) {
		case DATA_ROW_ID:
			ut_ad(len == DATA_ROW_ID_LEN);
			break;
		case DATA_TRX_ID:
			ut_ad(len == DATA_TRX_ID_LEN);
			break;
		case DATA_ROLL_PTR:
			ut_ad(len == DATA_ROLL_PTR_LEN);
			break;
		default:
			ut_ad(0);
			return(0);
		}
#endif /* UNIV_DEBUG */
	// Fall through.
	case DATA_CHAR:
	case DATA_FIXBINARY:
	case DATA_INT:
	case DATA_FLOAT:
	case DATA_DOUBLE:
	case DATA_POINT:
		return(len);
	case DATA_MYSQL:
		if (prtype & DATA_BINARY_TYPE) {
			return(len);
		} else {
			ulint	mbminlen = DATA_MBMINLEN(mbminmaxlen);
			ulint	mbmaxlen = DATA_MBMAXLEN(mbminmaxlen);

			if (mbminlen == mbmaxlen) {
				return(len);
			}

			/* this is a variable-length character set */
			ut_a(mbminlen > 0);
			ut_a(mbmaxlen > mbminlen);
			ut_a(len % mbmaxlen == 0);
			return(len * mbminlen / mbmaxlen);
		}
	case DATA_VARCHAR:
	case DATA_BINARY:
	case DATA_DECIMAL:
	case DATA_VARMYSQL:
	case DATA_VAR_POINT:
	case DATA_GEOMETRY:
	case DATA_BLOB:
		return(0);
	default:
		ut_error;
	}

	return(0);
}

/***********************************************************************//**
Returns the maximum size of a data type. Note: types in system tables may be
incomplete and return incorrect information.
@return maximum size */
UNIV_INLINE
ulint
dtype_get_max_size_low(
/*===================*/
	ulint	mtype,		/*!< in: main type */
	ulint	len)		/*!< in: length */
{
	switch (mtype) {
	case DATA_SYS:
	case DATA_CHAR:
	case DATA_FIXBINARY:
	case DATA_INT:
	case DATA_FLOAT:
	case DATA_DOUBLE:
	case DATA_MYSQL:
	case DATA_VARCHAR:
	case DATA_BINARY:
	case DATA_DECIMAL:
	case DATA_VARMYSQL:
	case DATA_POINT:
		return(len);
	case DATA_VAR_POINT:
	case DATA_GEOMETRY:
	case DATA_BLOB:
		break;
	default:
		ut_error;
	}

	return(ULINT_MAX);
}
#endif /* !UNIV_HOTBACKUP */

/***********************************************************************//**
Returns the ROW_FORMAT=REDUNDANT stored SQL NULL size of a type.
For fixed length types it is the fixed length of the type, otherwise 0.
@return SQL null storage size in ROW_FORMAT=REDUNDANT */
UNIV_INLINE
ulint
dtype_get_sql_null_size(
/*====================*/
	const dtype_t*	type,	/*!< in: type */
	ulint		comp)	/*!< in: nonzero=ROW_FORMAT=COMPACT  */
{
#ifndef UNIV_HOTBACKUP
	return(dtype_get_fixed_size_low(type->mtype, type->prtype, type->len,
					type->mbminmaxlen, comp));
#else /* !UNIV_HOTBACKUP */
	return(dtype_get_fixed_size_low(type->mtype, type->prtype, type->len,
					0, 0));
#endif /* !UNIV_HOTBACKUP */
}

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