/******************************************************
General row routines

(c) 1996 Innobase Oy

Created 4/20/1996 Heikki Tuuri
*******************************************************/

#include "dict0dict.h"
#include "rem0rec.h"
#include "trx0undo.h"

/*************************************************************************
Reads the trx id field from a clustered index record. */
UNIV_INLINE
dulint
row_get_rec_trx_id(
/*===============*/
				/* out: value of the field */
	const rec_t*	rec,	/* in: record */
	dict_index_t*	index,	/* in: clustered index */
	const ulint*	offsets)/* in: rec_get_offsets(rec, index) */
{
	ulint	offset;

	ut_ad(dict_index_is_clust(index));
	ut_ad(rec_offs_validate(rec, index, offsets));

	offset = index->trx_id_offset;

	if (!offset) {
		offset = row_get_trx_id_offset(rec, index, offsets);
	}

	return(trx_read_trx_id(rec + offset));
}

/*************************************************************************
Reads the roll pointer field from a clustered index record. */
UNIV_INLINE
dulint
row_get_rec_roll_ptr(
/*=================*/
				/* out: value of the field */
	const rec_t*	rec,	/* in: record */
	dict_index_t*	index,	/* in: clustered index */
	const ulint*	offsets)/* in: rec_get_offsets(rec, index) */
{
	ulint	offset;

	ut_ad(dict_index_is_clust(index));
	ut_ad(rec_offs_validate(rec, index, offsets));

	offset = index->trx_id_offset;

	if (!offset) {
		offset = row_get_trx_id_offset(rec, index, offsets);
	}

	return(trx_read_roll_ptr(rec + offset + DATA_TRX_ID_LEN));
}

/***********************************************************************
Builds from a secondary index record a row reference with which we can
search the clustered index record. */
UNIV_INLINE
void
row_build_row_ref_fast(
/*===================*/
	dtuple_t*	ref,	/* in: typed data tuple where the
				reference is built */
	const ulint*	map,	/* in: array of field numbers in rec
				telling how ref should be built from
				the fields of rec */
	const rec_t*	rec,	/* in: record in the index; must be
				preserved while ref is used, as we do
				not copy field values to heap */
	const ulint*	offsets)/* in: array returned by rec_get_offsets() */
{
	dfield_t*	dfield;
	const byte*	field;
	ulint		len;
	ulint		ref_len;
	ulint		field_no;
	ulint		i;

	ut_ad(rec_offs_validate(rec, NULL, offsets));
	ref_len = dtuple_get_n_fields(ref);

	for (i = 0; i < ref_len; i++) {
		dfield = dtuple_get_nth_field(ref, i);

		field_no = *(map + i);

		if (field_no != ULINT_UNDEFINED) {

			field = rec_get_nth_field(rec, offsets,
						  field_no, &len);
			dfield_set_data(dfield, field, len);
		}
	}
}