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

Copyright (c) 1994, 2016, 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
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/rem0rec.h
Record manager

Created 5/30/1994 Heikki Tuuri
*************************************************************************/

#ifndef rem0rec_h
#define rem0rec_h

#include "univ.i"
#include "data0data.h"
#include "rem0types.h"
#include "mtr0types.h"
#include "page0types.h"

/* Info bit denoting the predefined minimum record: this bit is set
if and only if the record is the first user record on a non-leaf
B-tree page that is the leftmost page on its level
(PAGE_LEVEL is nonzero and FIL_PAGE_PREV is FIL_NULL). */
#define REC_INFO_MIN_REC_FLAG	0x10UL
/* The deleted flag in info bits */
#define REC_INFO_DELETED_FLAG	0x20UL	/* when bit is set to 1, it means the
					record has been delete marked */

/* Number of extra bytes in an old-style record,
in addition to the data and the offsets */
#define REC_N_OLD_EXTRA_BYTES	6
/* Number of extra bytes in a new-style record,
in addition to the data and the offsets */
#define REC_N_NEW_EXTRA_BYTES	5

/* Record status values */
#define REC_STATUS_ORDINARY	0
#define REC_STATUS_NODE_PTR	1
#define REC_STATUS_INFIMUM	2
#define REC_STATUS_SUPREMUM	3

/* The following four constants are needed in page0zip.cc in order to
efficiently compress and decompress pages. */

/* The offset of heap_no in a compact record */
#define REC_NEW_HEAP_NO		4
/* The shift of heap_no in a compact record.
The status is stored in the low-order bits. */
#define	REC_HEAP_NO_SHIFT	3

/* Length of a B-tree node pointer, in bytes */
#define REC_NODE_PTR_SIZE	4

/** SQL null flag in a 1-byte offset of ROW_FORMAT=REDUNDANT records */
#define REC_1BYTE_SQL_NULL_MASK	0x80UL
/** SQL null flag in a 2-byte offset of ROW_FORMAT=REDUNDANT records */
#define REC_2BYTE_SQL_NULL_MASK	0x8000UL

/** In a 2-byte offset of ROW_FORMAT=REDUNDANT records, the second most
significant bit denotes that the tail of a field is stored off-page. */
#define REC_2BYTE_EXTERN_MASK	0x4000UL

#ifdef UNIV_DEBUG
/* Length of the rec_get_offsets() header */
# define REC_OFFS_HEADER_SIZE	4
#else /* UNIV_DEBUG */
/* Length of the rec_get_offsets() header */
# define REC_OFFS_HEADER_SIZE	2
#endif /* UNIV_DEBUG */

/* Number of elements that should be initially allocated for the
offsets[] array, first passed to rec_get_offsets() */
#define REC_OFFS_NORMAL_SIZE	100
#define REC_OFFS_SMALL_SIZE	10

/******************************************************//**
The following function is used to get the pointer of the next chained record
on the same page.
@return	pointer to the next chained record, or NULL if none */
UNIV_INLINE
const rec_t*
rec_get_next_ptr_const(
/*===================*/
	const rec_t*	rec,	/*!< in: physical record */
	ulint		comp)	/*!< in: nonzero=compact page format */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to get the pointer of the next chained record
on the same page.
@return	pointer to the next chained record, or NULL if none */
UNIV_INLINE
rec_t*
rec_get_next_ptr(
/*=============*/
	rec_t*	rec,	/*!< in: physical record */
	ulint	comp)	/*!< in: nonzero=compact page format */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to get the offset of the
next chained record on the same page.
@return	the page offset of the next chained record, or 0 if none */
UNIV_INLINE
ulint
rec_get_next_offs(
/*==============*/
	const rec_t*	rec,	/*!< in: physical record */
	ulint		comp)	/*!< in: nonzero=compact page format */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the next record offset field
of an old-style record. */
UNIV_INLINE
void
rec_set_next_offs_old(
/*==================*/
	rec_t*	rec,	/*!< in: old-style physical record */
	ulint	next)	/*!< in: offset of the next record */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to set the next record offset field
of a new-style record. */
UNIV_INLINE
void
rec_set_next_offs_new(
/*==================*/
	rec_t*	rec,	/*!< in/out: new-style physical record */
	ulint	next)	/*!< in: offset of the next record */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to get the number of fields
in an old-style record.
@return	number of data fields */
UNIV_INLINE
ulint
rec_get_n_fields_old(
/*=================*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to get the number of fields
in a record.
@return	number of data fields */
UNIV_INLINE
ulint
rec_get_n_fields(
/*=============*/
	const rec_t*		rec,	/*!< in: physical record */
	const dict_index_t*	index)	/*!< in: record descriptor */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to get the number of records owned by the
previous directory record.
@return	number of owned records */
UNIV_INLINE
ulint
rec_get_n_owned_old(
/*================*/
	const rec_t*	rec)	/*!< in: old-style physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the number of owned records. */
UNIV_INLINE
void
rec_set_n_owned_old(
/*================*/
	rec_t*	rec,		/*!< in: old-style physical record */
	ulint	n_owned)	/*!< in: the number of owned */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to get the number of records owned by the
previous directory record.
@return	number of owned records */
UNIV_INLINE
ulint
rec_get_n_owned_new(
/*================*/
	const rec_t*	rec)	/*!< in: new-style physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the number of owned records. */
UNIV_INLINE
void
rec_set_n_owned_new(
/*================*/
	rec_t*		rec,	/*!< in/out: new-style physical record */
	page_zip_des_t*	page_zip,/*!< in/out: compressed page, or NULL */
	ulint		n_owned)/*!< in: the number of owned */
	MY_ATTRIBUTE((nonnull(1)));
/******************************************************//**
The following function is used to retrieve the info bits of
a record.
@return	info bits */
UNIV_INLINE
ulint
rec_get_info_bits(
/*==============*/
	const rec_t*	rec,	/*!< in: physical record */
	ulint		comp)	/*!< in: nonzero=compact page format */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the info bits of a record. */
UNIV_INLINE
void
rec_set_info_bits_old(
/*==================*/
	rec_t*	rec,	/*!< in: old-style physical record */
	ulint	bits)	/*!< in: info bits */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to set the info bits of a record. */
UNIV_INLINE
void
rec_set_info_bits_new(
/*==================*/
	rec_t*	rec,	/*!< in/out: new-style physical record */
	ulint	bits)	/*!< in: info bits */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function retrieves the status bits of a new-style record.
@return	status bits */
UNIV_INLINE
ulint
rec_get_status(
/*===========*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));

/******************************************************//**
The following function is used to set the status bits of a new-style record. */
UNIV_INLINE
void
rec_set_status(
/*===========*/
	rec_t*	rec,	/*!< in/out: physical record */
	ulint	bits)	/*!< in: info bits */
	MY_ATTRIBUTE((nonnull));

/******************************************************//**
The following function is used to retrieve the info and status
bits of a record.  (Only compact records have status bits.)
@return	info bits */
UNIV_INLINE
ulint
rec_get_info_and_status_bits(
/*=========================*/
	const rec_t*	rec,	/*!< in: physical record */
	ulint		comp)	/*!< in: nonzero=compact page format */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the info and status
bits of a record.  (Only compact records have status bits.) */
UNIV_INLINE
void
rec_set_info_and_status_bits(
/*=========================*/
	rec_t*	rec,	/*!< in/out: compact physical record */
	ulint	bits)	/*!< in: info bits */
	MY_ATTRIBUTE((nonnull));

/******************************************************//**
The following function tells if record is delete marked.
@return	nonzero if delete marked */
UNIV_INLINE
ulint
rec_get_deleted_flag(
/*=================*/
	const rec_t*	rec,	/*!< in: physical record */
	ulint		comp)	/*!< in: nonzero=compact page format */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the deleted bit. */
UNIV_INLINE
void
rec_set_deleted_flag_old(
/*=====================*/
	rec_t*	rec,	/*!< in: old-style physical record */
	ulint	flag)	/*!< in: nonzero if delete marked */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to set the deleted bit. */
UNIV_INLINE
void
rec_set_deleted_flag_new(
/*=====================*/
	rec_t*		rec,	/*!< in/out: new-style physical record */
	page_zip_des_t*	page_zip,/*!< in/out: compressed page, or NULL */
	ulint		flag)	/*!< in: nonzero if delete marked */
	MY_ATTRIBUTE((nonnull(1)));
/******************************************************//**
The following function tells if a new-style record is a node pointer.
@return	TRUE if node pointer */
UNIV_INLINE
ibool
rec_get_node_ptr_flag(
/*==================*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to get the order number
of an old-style record in the heap of the index page.
@return	heap order number */
UNIV_INLINE
ulint
rec_get_heap_no_old(
/*================*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the heap number
field in an old-style record. */
UNIV_INLINE
void
rec_set_heap_no_old(
/*================*/
	rec_t*	rec,	/*!< in: physical record */
	ulint	heap_no)/*!< in: the heap number */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to get the order number
of a new-style record in the heap of the index page.
@return	heap order number */
UNIV_INLINE
ulint
rec_get_heap_no_new(
/*================*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
The following function is used to set the heap number
field in a new-style record. */
UNIV_INLINE
void
rec_set_heap_no_new(
/*================*/
	rec_t*	rec,	/*!< in/out: physical record */
	ulint	heap_no)/*!< in: the heap number */
	MY_ATTRIBUTE((nonnull));
/******************************************************//**
The following function is used to test whether the data offsets
in the record are stored in one-byte or two-byte format.
@return	TRUE if 1-byte form */
UNIV_INLINE
ibool
rec_get_1byte_offs_flag(
/*====================*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));

/******************************************************//**
The following function is used to set the 1-byte offsets flag. */
UNIV_INLINE
void
rec_set_1byte_offs_flag(
/*====================*/
	rec_t*	rec,	/*!< in: physical record */
	ibool	flag)	/*!< in: TRUE if 1byte form */
	MY_ATTRIBUTE((nonnull));

/******************************************************//**
Returns the offset of nth field end if the record is stored in the 1-byte
offsets form. If the field is SQL null, the flag is ORed in the returned
value.
@return	offset of the start of the field, SQL null flag ORed */
UNIV_INLINE
ulint
rec_1_get_field_end_info(
/*=====================*/
	const rec_t*	rec,	/*!< in: record */
	ulint		n)	/*!< in: field index */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));

/******************************************************//**
Returns the offset of nth field end if the record is stored in the 2-byte
offsets form. If the field is SQL null, the flag is ORed in the returned
value.
@return offset of the start of the field, SQL null flag and extern
storage flag ORed */
UNIV_INLINE
ulint
rec_2_get_field_end_info(
/*=====================*/
	const rec_t*	rec,	/*!< in: record */
	ulint		n)	/*!< in: field index */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));

/******************************************************//**
Returns nonzero if the field is stored off-page.
@retval 0 if the field is stored in-page
@retval REC_2BYTE_EXTERN_MASK if the field is stored externally */
UNIV_INLINE
ulint
rec_2_is_field_extern(
/*==================*/
	const rec_t*	rec,	/*!< in: record */
	ulint		n)	/*!< in: field index */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));

/******************************************************//**
Determine how many of the first n columns in a compact
physical record are stored externally.
@return	number of externally stored columns */
UNIV_INTERN
ulint
rec_get_n_extern_new(
/*=================*/
	const rec_t*		rec,	/*!< in: compact physical record */
	const dict_index_t*	index,	/*!< in: record descriptor */
	ulint			n)	/*!< in: number of columns to scan */
	MY_ATTRIBUTE((nonnull, warn_unused_result));

/******************************************************//**
The following function determines the offsets to each field
in the record.	It can reuse a previously allocated array.
@return	the new offsets */
UNIV_INTERN
ulint*
rec_get_offsets_func(
/*=================*/
	const rec_t*		rec,	/*!< in: physical record */
	const dict_index_t*	index,	/*!< in: record descriptor */
	ulint*			offsets,/*!< in/out: array consisting of
					offsets[0] allocated elements,
					or an array from rec_get_offsets(),
					or NULL */
	ulint			n_fields,/*!< in: maximum number of
					initialized fields
					 (ULINT_UNDEFINED if all fields) */
#ifdef UNIV_DEBUG
	const char*		file,	/*!< in: file name where called */
	ulint			line,	/*!< in: line number where called */
#endif /* UNIV_DEBUG */
	mem_heap_t**		heap)	/*!< in/out: memory heap */
#ifdef UNIV_DEBUG
	MY_ATTRIBUTE((nonnull(1,2,5,7),warn_unused_result));
#else /* UNIV_DEBUG */
	MY_ATTRIBUTE((nonnull(1,2,5),warn_unused_result));
#endif /* UNIV_DEBUG */

#ifdef UNIV_DEBUG
# define rec_get_offsets(rec,index,offsets,n,heap)			\
	rec_get_offsets_func(rec,index,offsets,n,__FILE__,__LINE__,heap)
#else /* UNIV_DEBUG */
# define rec_get_offsets(rec, index, offsets, n, heap)	\
	rec_get_offsets_func(rec, index, offsets, n, heap)
#endif /* UNIV_DEBUG */

/******************************************************//**
The following function determines the offsets to each field
in the record.  It can reuse a previously allocated array. */
UNIV_INTERN
void
rec_get_offsets_reverse(
/*====================*/
	const byte*		extra,	/*!< in: the extra bytes of a
					compact record in reverse order,
					excluding the fixed-size
					REC_N_NEW_EXTRA_BYTES */
	const dict_index_t*	index,	/*!< in: record descriptor */
	ulint			node_ptr,/*!< in: nonzero=node pointer,
					0=leaf node */
	ulint*			offsets)/*!< in/out: array consisting of
					offsets[0] allocated elements */
	MY_ATTRIBUTE((nonnull));
#ifdef UNIV_DEBUG
/************************************************************//**
Validates offsets returned by rec_get_offsets().
@return	TRUE if valid */
UNIV_INLINE
ibool
rec_offs_validate(
/*==============*/
	const rec_t*		rec,	/*!< in: record or NULL */
	const dict_index_t*	index,	/*!< in: record descriptor or NULL */
	const ulint*		offsets)/*!< in: array returned by
					rec_get_offsets() */
	MY_ATTRIBUTE((nonnull(3), warn_unused_result));
/************************************************************//**
Updates debug data in offsets, in order to avoid bogus
rec_offs_validate() failures. */
UNIV_INLINE
void
rec_offs_make_valid(
/*================*/
	const rec_t*		rec,	/*!< in: record */
	const dict_index_t*	index,	/*!< in: record descriptor */
	ulint*			offsets)/*!< in: array returned by
					rec_get_offsets() */
	MY_ATTRIBUTE((nonnull));
#else
# define rec_offs_make_valid(rec, index, offsets) ((void) 0)
#endif /* UNIV_DEBUG */

/************************************************************//**
The following function is used to get the offset to the nth
data field in an old-style record.
@return	offset to the field */
UNIV_INTERN
ulint
rec_get_nth_field_offs_old(
/*=======================*/
	const rec_t*	rec,	/*!< in: record */
	ulint		n,	/*!< in: index of the field */
	ulint*		len)	/*!< out: length of the field; UNIV_SQL_NULL
				if SQL null */
	MY_ATTRIBUTE((nonnull));
#define rec_get_nth_field_old(rec, n, len) \
((rec) + rec_get_nth_field_offs_old(rec, n, len))
/************************************************************//**
Gets the physical size of an old-style field.
Also an SQL null may have a field of size > 0,
if the data type is of a fixed size.
@return	field size in bytes */
UNIV_INLINE
ulint
rec_get_nth_field_size(
/*===================*/
	const rec_t*	rec,	/*!< in: record */
	ulint		n)	/*!< in: index of the field */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/************************************************************//**
The following function is used to get an offset to the nth
data field in a record.
@return	offset from the origin of rec */
UNIV_INLINE
ulint
rec_get_nth_field_offs(
/*===================*/
	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
	ulint		n,	/*!< in: index of the field */
	ulint*		len)	/*!< out: length of the field; UNIV_SQL_NULL
				if SQL null */
	MY_ATTRIBUTE((nonnull));
#define rec_get_nth_field(rec, offsets, n, len) \
((rec) + rec_get_nth_field_offs(offsets, n, len))
/******************************************************//**
Determine if the offsets are for a record in the new
compact format.
@return	nonzero if compact format */
UNIV_INLINE
ulint
rec_offs_comp(
/*==========*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
Determine if the offsets are for a record containing
externally stored columns.
@return	nonzero if externally stored */
UNIV_INLINE
ulint
rec_offs_any_extern(
/*================*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
Determine if the offsets are for a record containing null BLOB pointers.
@return	first field containing a null BLOB pointer, or NULL if none found */
UNIV_INLINE
const byte*
rec_offs_any_null_extern(
/*=====================*/
	const rec_t*	rec,		/*!< in: record */
	const ulint*	offsets)	/*!< in: rec_get_offsets(rec) */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
Returns nonzero if the extern bit is set in nth field of rec.
@return	nonzero if externally stored */
UNIV_INLINE
ulint
rec_offs_nth_extern(
/*================*/
	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
	ulint		n)	/*!< in: nth field */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
Returns nonzero if the SQL NULL bit is set in nth field of rec.
@return	nonzero if SQL NULL */
UNIV_INLINE
ulint
rec_offs_nth_sql_null(
/*==================*/
	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
	ulint		n)	/*!< in: nth field */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/******************************************************//**
Gets the physical size of a field.
@return	length of field */
UNIV_INLINE
ulint
rec_offs_nth_size(
/*==============*/
	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
	ulint		n)	/*!< in: nth field */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));

/******************************************************//**
Returns the number of extern bits set in a record.
@return	number of externally stored fields */
UNIV_INLINE
ulint
rec_offs_n_extern(
/*==============*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/***********************************************************//**
This is used to modify the value of an already existing field in a record.
The previous value must have exactly the same size as the new value. If len
is UNIV_SQL_NULL then the field is treated as an SQL null.
For records in ROW_FORMAT=COMPACT (new-style records), len must not be
UNIV_SQL_NULL unless the field already is SQL null. */
UNIV_INLINE
void
rec_set_nth_field(
/*==============*/
	rec_t*		rec,	/*!< in: record */
	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
	ulint		n,	/*!< in: index number of the field */
	const void*	data,	/*!< in: pointer to the data if not SQL null */
	ulint		len)	/*!< in: length of the data or UNIV_SQL_NULL.
				If not SQL null, must have the same
				length as the previous value.
				If SQL null, previous value must be
				SQL null. */
	MY_ATTRIBUTE((nonnull(1,2)));
/**********************************************************//**
The following function returns the data size of an old-style physical
record, that is the sum of field lengths. SQL null fields
are counted as length 0 fields. The value returned by the function
is the distance from record origin to record end in bytes.
@return	size */
UNIV_INLINE
ulint
rec_get_data_size_old(
/*==================*/
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/**********************************************************//**
The following function returns the number of allocated elements
for an array of offsets.
@return	number of elements */
UNIV_INLINE
ulint
rec_offs_get_n_alloc(
/*=================*/
	const ulint*	offsets)/*!< in: array for rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/**********************************************************//**
The following function sets the number of allocated elements
for an array of offsets. */
UNIV_INLINE
void
rec_offs_set_n_alloc(
/*=================*/
	ulint*	offsets,	/*!< out: array for rec_get_offsets(),
				must be allocated */
	ulint	n_alloc)	/*!< in: number of elements */
	MY_ATTRIBUTE((nonnull));
#define rec_offs_init(offsets) \
	rec_offs_set_n_alloc(offsets, (sizeof offsets) / sizeof *offsets)
/**********************************************************//**
The following function returns the number of fields in a record.
@return	number of fields */
UNIV_INLINE
ulint
rec_offs_n_fields(
/*==============*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/**********************************************************//**
The following function returns the data size of a physical
record, that is the sum of field lengths. SQL null fields
are counted as length 0 fields. The value returned by the function
is the distance from record origin to record end in bytes.
@return	size */
UNIV_INLINE
ulint
rec_offs_data_size(
/*===============*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/**********************************************************//**
Returns the total size of record minus data size of record.
The value returned by the function is the distance from record
start to record origin in bytes.
@return	size */
UNIV_INLINE
ulint
rec_offs_extra_size(
/*================*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/**********************************************************//**
Returns the total size of a physical record.
@return	size */
UNIV_INLINE
ulint
rec_offs_size(
/*==========*/
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
#ifdef UNIV_DEBUG
/**********************************************************//**
Returns a pointer to the start of the record.
@return	pointer to start */
UNIV_INLINE
byte*
rec_get_start(
/*==========*/
	const rec_t*	rec,	/*!< in: pointer to record */
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
/**********************************************************//**
Returns a pointer to the end of the record.
@return	pointer to end */
UNIV_INLINE
byte*
rec_get_end(
/*========*/
	const rec_t*	rec,	/*!< in: pointer to record */
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
#else /* UNIV_DEBUG */
# define rec_get_start(rec, offsets) ((rec) - rec_offs_extra_size(offsets))
# define rec_get_end(rec, offsets) ((rec) + rec_offs_data_size(offsets))
#endif /* UNIV_DEBUG */
/***************************************************************//**
Copies a physical record to a buffer.
@return	pointer to the origin of the copy */
UNIV_INLINE
rec_t*
rec_copy(
/*=====*/
	void*		buf,	/*!< in: buffer */
	const rec_t*	rec,	/*!< in: physical record */
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull));
#ifndef UNIV_HOTBACKUP
/**********************************************************//**
Determines the size of a data tuple prefix in a temporary file.
@return	total size */
UNIV_INTERN
ulint
rec_get_converted_size_temp(
/*========================*/
	const dict_index_t*	index,	/*!< in: record descriptor */
	const dfield_t*		fields,	/*!< in: array of data fields */
	ulint			n_fields,/*!< in: number of data fields */
	ulint*			extra)	/*!< out: extra size */
	MY_ATTRIBUTE((warn_unused_result, nonnull));

/******************************************************//**
Determine the offset to each field in temporary file.
@see rec_convert_dtuple_to_temp() */
UNIV_INTERN
void
rec_init_offsets_temp(
/*==================*/
	const rec_t*		rec,	/*!< in: temporary file record */
	const dict_index_t*	index,	/*!< in: record descriptor */
	ulint*			offsets)/*!< in/out: array of offsets;
					in: n=rec_offs_n_fields(offsets) */
	MY_ATTRIBUTE((nonnull));

/*********************************************************//**
Builds a temporary file record out of a data tuple.
@see rec_init_offsets_temp() */
UNIV_INTERN
void
rec_convert_dtuple_to_temp(
/*=======================*/
	rec_t*			rec,		/*!< out: record */
	const dict_index_t*	index,		/*!< in: record descriptor */
	const dfield_t*		fields,		/*!< in: array of data fields */
	ulint			n_fields)	/*!< in: number of fields */
	MY_ATTRIBUTE((nonnull));

/**************************************************************//**
Copies the first n fields of a physical record to a new physical record in
a buffer.
@return	own: copied record */
UNIV_INTERN
rec_t*
rec_copy_prefix_to_buf(
/*===================*/
	const rec_t*		rec,		/*!< in: physical record */
	const dict_index_t*	index,		/*!< in: record descriptor */
	ulint			n_fields,	/*!< in: number of fields
						to copy */
	byte**			buf,		/*!< in/out: memory buffer
						for the copied prefix,
						or NULL */
	ulint*			buf_size)	/*!< in/out: buffer size */
	MY_ATTRIBUTE((nonnull));
/************************************************************//**
Folds a prefix of a physical record to a ulint.
@return	the folded value */
UNIV_INLINE
ulint
rec_fold(
/*=====*/
	const rec_t*	rec,		/*!< in: the physical record */
	const ulint*	offsets,	/*!< in: array returned by
					rec_get_offsets() */
	ulint		n_fields,	/*!< in: number of complete
					fields to fold */
	ulint		n_bytes,	/*!< in: number of bytes to fold
					in an incomplete last field */
	index_id_t	tree_id)	/*!< in: index tree id */
	MY_ATTRIBUTE((nonnull, pure, warn_unused_result));
#endif /* !UNIV_HOTBACKUP */
/*********************************************************//**
Builds a physical record out of a data tuple and
stores it into the given buffer.
@return	pointer to the origin of physical record */
UNIV_INTERN
rec_t*
rec_convert_dtuple_to_rec(
/*======================*/
	byte*			buf,	/*!< in: start address of the
					physical record */
	const dict_index_t*	index,	/*!< in: record descriptor */
	const dtuple_t*		dtuple,	/*!< in: data tuple */
	ulint			n_ext)	/*!< in: number of
					externally stored columns */
	MY_ATTRIBUTE((nonnull, warn_unused_result));
/**********************************************************//**
Returns the extra size of an old-style physical record if we know its
data size and number of fields.
@return	extra size */
UNIV_INLINE
ulint
rec_get_converted_extra_size(
/*=========================*/
	ulint	data_size,	/*!< in: data size */
	ulint	n_fields,	/*!< in: number of fields */
	ulint	n_ext)		/*!< in: number of externally stored columns */
	MY_ATTRIBUTE((const));
/**********************************************************//**
Determines the size of a data tuple prefix in ROW_FORMAT=COMPACT.
@return	total size */
UNIV_INTERN
ulint
rec_get_converted_size_comp_prefix(
/*===============================*/
	const dict_index_t*	index,	/*!< in: record descriptor */
	const dfield_t*		fields,	/*!< in: array of data fields */
	ulint			n_fields,/*!< in: number of data fields */
	ulint*			extra)	/*!< out: extra size */
	MY_ATTRIBUTE((warn_unused_result, nonnull(1,2)));
/**********************************************************//**
Determines the size of a data tuple in ROW_FORMAT=COMPACT.
@return	total size */
UNIV_INTERN
ulint
rec_get_converted_size_comp(
/*========================*/
	const dict_index_t*	index,	/*!< in: record descriptor;
					dict_table_is_comp() is
					assumed to hold, even if
					it does not */
	ulint			status,	/*!< in: status bits of the record */
	const dfield_t*		fields,	/*!< in: array of data fields */
	ulint			n_fields,/*!< in: number of data fields */
	ulint*			extra)	/*!< out: extra size */
	MY_ATTRIBUTE((nonnull(1,3)));
/**********************************************************//**
The following function returns the size of a data tuple when converted to
a physical record.
@return	size */
UNIV_INLINE
ulint
rec_get_converted_size(
/*===================*/
	dict_index_t*	index,	/*!< in: record descriptor */
	const dtuple_t*	dtuple,	/*!< in: data tuple */
	ulint		n_ext)	/*!< in: number of externally stored columns */
	MY_ATTRIBUTE((warn_unused_result, nonnull));
#ifndef UNIV_HOTBACKUP
/**************************************************************//**
Copies the first n fields of a physical record to a data tuple.
The fields are copied to the memory heap. */
UNIV_INTERN
void
rec_copy_prefix_to_dtuple(
/*======================*/
	dtuple_t*		tuple,		/*!< out: data tuple */
	const rec_t*		rec,		/*!< in: physical record */
	const dict_index_t*	index,		/*!< in: record descriptor */
	ulint			n_fields,	/*!< in: number of fields
						to copy */
	mem_heap_t*		heap)		/*!< in: memory heap */
	MY_ATTRIBUTE((nonnull));
#endif /* !UNIV_HOTBACKUP */
/***************************************************************//**
Validates the consistency of a physical record.
@return	TRUE if ok */
UNIV_INTERN
ibool
rec_validate(
/*=========*/
	const rec_t*	rec,	/*!< in: physical record */
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull));
/***************************************************************//**
Prints an old-style physical record. */
UNIV_INTERN
void
rec_print_old(
/*==========*/
	FILE*		file,	/*!< in: file where to print */
	const rec_t*	rec)	/*!< in: physical record */
	MY_ATTRIBUTE((nonnull));
#ifndef UNIV_HOTBACKUP
/***************************************************************//**
Prints a physical record in ROW_FORMAT=COMPACT.  Ignores the
record header. */
UNIV_INTERN
void
rec_print_comp(
/*===========*/
	FILE*		file,	/*!< in: file where to print */
	const rec_t*	rec,	/*!< in: physical record */
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull));
/***************************************************************//**
Prints a physical record. */
UNIV_INTERN
void
rec_print_new(
/*==========*/
	FILE*		file,	/*!< in: file where to print */
	const rec_t*	rec,	/*!< in: physical record */
	const ulint*	offsets)/*!< in: array returned by rec_get_offsets() */
	MY_ATTRIBUTE((nonnull));
/***************************************************************//**
Prints a physical record. */
UNIV_INTERN
void
rec_print(
/*======*/
	FILE*			file,	/*!< in: file where to print */
	const rec_t*		rec,	/*!< in: physical record */
	const dict_index_t*	index)	/*!< in: record descriptor */
	MY_ATTRIBUTE((nonnull));

# ifdef UNIV_DEBUG
/************************************************************//**
Reads the DB_TRX_ID of a clustered index record.
@return	the value of DB_TRX_ID */
UNIV_INTERN
trx_id_t
rec_get_trx_id(
/*===========*/
	const rec_t*		rec,	/*!< in: record */
	const dict_index_t*	index)	/*!< in: clustered index */
	MY_ATTRIBUTE((nonnull, warn_unused_result));
# endif /* UNIV_DEBUG */
#endif /* UNIV_HOTBACKUP */

/* Maximum lengths for the data in a physical record if the offsets
are given in one byte (resp. two byte) format. */
#define REC_1BYTE_OFFS_LIMIT	0x7FUL
#define REC_2BYTE_OFFS_LIMIT	0x7FFFUL

/* The data size of record must be smaller than this because we reserve
two upmost bits in a two byte offset for special purposes */
#define REC_MAX_DATA_SIZE	(16 * 1024)

#ifndef UNIV_NONINL
#include "rem0rec.ic"
#endif

#endif
