mariadb/include/rem0rec.h

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

Copyright (c) 1994, 2009, Innobase Oy. 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 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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 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.c 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

#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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */

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

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

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

/******************************************************//**
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 */
	dict_index_t*	index,	/*!< in: record descriptor */
	ulint		n);	/*!< in: number of columns to scan */

/******************************************************//**
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) */
	mem_heap_t**		heap,	/*!< in/out: memory heap */
	const char*		file,	/*!< in: file name where called */
	ulint			line);	/*!< in: line number where called */

#define rec_get_offsets(rec,index,offsets,n,heap)	\
	rec_get_offsets_func(rec,index,offsets,n,heap,__FILE__,__LINE__)

/******************************************************//**
Determine the offset to each field in a leaf-page record
in ROW_FORMAT=COMPACT.  This is a special case of
rec_init_offsets() and rec_get_offsets_func(). */
UNIV_INTERN
void
rec_init_offsets_comp_ordinary(
/*===========================*/
	const rec_t*		rec,	/*!< in: physical record in
					ROW_FORMAT=COMPACT */
	ulint			extra,	/*!< in: number of bytes to reserve
					between the record header and
					the data payload
					(usually REC_N_NEW_EXTRA_BYTES) */
	const dict_index_t*	index,	/*!< in: record descriptor */
	ulint*			offsets);/*!< in/out: array of offsets;
					in: n=rec_offs_n_fields(offsets) */

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

/************************************************************//**
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() */
#ifdef UNIV_DEBUG
/************************************************************//**
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() */
#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 */
#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 */
/************************************************************//**
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 */
#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() */
/******************************************************//**
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() */
/******************************************************//**
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 */
/******************************************************//**
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 */
/******************************************************//**
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 */

/******************************************************//**
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() */
/***********************************************************//**
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 */
/**********************************************************//**
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 */
/**********************************************************//**
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() */
/**********************************************************//**
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 */
#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() */
/**********************************************************//**
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() */
/**********************************************************//**
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() */
/**********************************************************//**
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() */
/**********************************************************//**
Returns a pointer to the start of the record.
@return	pointer to start */
UNIV_INLINE
byte*
rec_get_start(
/*==========*/
	rec_t*		rec,	/*!< in: pointer to record */
	const ulint*	offsets);/*!< in: array returned by rec_get_offsets() */
/**********************************************************//**
Returns a pointer to the end of the record.
@return	pointer to end */
UNIV_INLINE
byte*
rec_get_end(
/*========*/
	rec_t*		rec,	/*!< in: pointer to record */
	const ulint*	offsets);/*!< in: array returned by rec_get_offsets() */
/***************************************************************//**
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() */
#ifndef UNIV_HOTBACKUP
/**************************************************************//**
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 */
/************************************************************//**
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 */
	dulint		tree_id)	/*!< in: index tree id */
	__attribute__((pure));
#endif /* !UNIV_HOTBACKUP */
/*********************************************************//**
Builds a ROW_FORMAT=COMPACT record out of a data tuple. */
UNIV_INTERN
void
rec_convert_dtuple_to_rec_comp(
/*===========================*/
	rec_t*			rec,	/*!< in: origin of record */
	ulint			extra,	/*!< in: number of bytes to
					reserve between the record
					header and the data payload
					(normally REC_N_NEW_EXTRA_BYTES) */
	const dict_index_t*	index,	/*!< in: record descriptor */
	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 */
/*********************************************************//**
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 */
/**********************************************************//**
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 */
		__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;
					dict_table_is_comp() is
					assumed to hold, even if
					it does not */
	const dfield_t*		fields,	/*!< in: array of data fields */
	ulint			n_fields,/*!< in: number of data fields */
	ulint*			extra);	/*!< out: extra size */
/**********************************************************//**
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 */
/**********************************************************//**
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 */
#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 */
#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() */
/***************************************************************//**
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 */
#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() */
/***************************************************************//**
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() */
/***************************************************************//**
Prints a physical record. */
UNIV_INTERN
void
rec_print(
/*======*/
	FILE*		file,	/*!< in: file where to print */
	const rec_t*	rec,	/*!< in: physical record */
	dict_index_t*	index);	/*!< in: record descriptor */
#endif /* UNIV_HOTBACKUP */

#define REC_INFO_BITS		6	/* This is single byte bit-field */

/* 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