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

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

/** @file page/page.ic
 Index page routines

 Created 2/2/1994 Heikki Tuuri
 *******************************************************/

/** NOTE: The functions in this file should only use functions from
other files in library. The code in this file is used to make a library for
external tools. */

#ifndef page_page_h
#define page_page_h

#include "mach0data.h"
/** Reads the given header field. */
UNIV_INLINE
ulint page_header_get_field(const page_t *page, /*!< in: page */
                            ulint field)        /*!< in: PAGE_LEVEL, ... */
{
  ut_ad(page);
  ut_ad(field <= PAGE_INDEX_ID);

  return (mach_read_from_2(page + PAGE_HEADER + field));
}
/** Gets the number of records in the heap.
 @return number of user records */
UNIV_INLINE
ulint page_dir_get_n_heap(const page_t *page) /*!< in: index page */
{
  return (page_header_get_field(page, PAGE_N_HEAP) & 0x7fff);
}
#endif