201 lines
5.9 KiB
C
201 lines
5.9 KiB
C
/** @file midl.h
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* @brief LMDB ID List header file.
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*
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* This file was originally part of back-bdb but has been
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* modified for use in libmdb. Most of the macros defined
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* in this file are unused, just left over from the original.
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*
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* This file is only used internally in libmdb and its definitions
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* are not exposed publicly.
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*/
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 2000-2019 The OpenLDAP Foundation.
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* Portions Copyright 2001-2019 Howard Chu, Symas Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#ifndef _MDB_MIDL_H_
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#define _MDB_MIDL_H_
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#include "lmdb.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @defgroup internal LMDB Internals
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* @{
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*/
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/** @defgroup idls ID List Management
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* @{
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*/
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/** A generic unsigned ID number. These were entryIDs in back-bdb.
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* Preferably it should have the same size as a pointer.
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*/
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typedef mdb_size_t MDB_ID;
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/** An IDL is an ID List, a sorted array of IDs. The first
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* element of the array is a counter for how many actual
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* IDs are in the list. In the original back-bdb code, IDLs are
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* sorted in ascending order. For libmdb IDLs are sorted in
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* descending order.
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*/
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typedef MDB_ID *MDB_IDL;
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/* IDL sizes - likely should be even bigger
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* limiting factors: sizeof(ID), thread stack size
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*/
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#define MDB_IDL_LOGN 16 /* DB_SIZE is 2^16, UM_SIZE is 2^17 */
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#define MDB_IDL_DB_SIZE (1<<MDB_IDL_LOGN)
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#define MDB_IDL_UM_SIZE (1<<(MDB_IDL_LOGN+1))
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#define MDB_IDL_DB_MAX (MDB_IDL_DB_SIZE-1)
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#define MDB_IDL_UM_MAX (MDB_IDL_UM_SIZE-1)
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#define MDB_IDL_SIZEOF(ids) (((ids)[0]+1) * sizeof(MDB_ID))
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#define MDB_IDL_IS_ZERO(ids) ( (ids)[0] == 0 )
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#define MDB_IDL_CPY( dst, src ) (memcpy( dst, src, MDB_IDL_SIZEOF( src ) ))
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#define MDB_IDL_FIRST( ids ) ( (ids)[1] )
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#define MDB_IDL_LAST( ids ) ( (ids)[(ids)[0]] )
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/** Current max length of an #mdb_midl_alloc()ed IDL */
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#define MDB_IDL_ALLOCLEN( ids ) ( (ids)[-1] )
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/** Append ID to IDL. The IDL must be big enough. */
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#define mdb_midl_xappend(idl, id) do { \
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MDB_ID *xidl = (idl), xlen = ++(xidl[0]); \
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xidl[xlen] = (id); \
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} while (0)
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/** Search for an ID in an IDL.
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* @param[in] ids The IDL to search.
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* @param[in] id The ID to search for.
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* @return The index of the first ID greater than or equal to \b id.
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*/
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unsigned mdb_midl_search( MDB_IDL ids, MDB_ID id );
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/** Allocate an IDL.
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* Allocates memory for an IDL of the given size.
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* @return IDL on success, NULL on failure.
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*/
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MDB_IDL mdb_midl_alloc(int num);
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/** Free an IDL.
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* @param[in] ids The IDL to free.
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*/
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void mdb_midl_free(MDB_IDL ids);
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/** Shrink an IDL.
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* Return the IDL to the default size if it has grown larger.
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* @param[in,out] idp Address of the IDL to shrink.
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*/
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void mdb_midl_shrink(MDB_IDL *idp);
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/** Make room for num additional elements in an IDL.
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* @param[in,out] idp Address of the IDL.
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* @param[in] num Number of elements to make room for.
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* @return 0 on success, ENOMEM on failure.
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*/
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int mdb_midl_need(MDB_IDL *idp, unsigned num);
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/** Append an ID onto an IDL.
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* @param[in,out] idp Address of the IDL to append to.
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* @param[in] id The ID to append.
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* @return 0 on success, ENOMEM if the IDL is too large.
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*/
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int mdb_midl_append( MDB_IDL *idp, MDB_ID id );
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/** Append an IDL onto an IDL.
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* @param[in,out] idp Address of the IDL to append to.
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* @param[in] app The IDL to append.
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* @return 0 on success, ENOMEM if the IDL is too large.
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*/
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int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app );
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/** Append an ID range onto an IDL.
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* @param[in,out] idp Address of the IDL to append to.
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* @param[in] id The lowest ID to append.
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* @param[in] n Number of IDs to append.
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* @return 0 on success, ENOMEM if the IDL is too large.
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*/
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int mdb_midl_append_range( MDB_IDL *idp, MDB_ID id, unsigned n );
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/** Merge an IDL onto an IDL. The destination IDL must be big enough.
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* @param[in] idl The IDL to merge into.
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* @param[in] merge The IDL to merge.
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*/
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void mdb_midl_xmerge( MDB_IDL idl, MDB_IDL merge );
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/** Sort an IDL.
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* @param[in,out] ids The IDL to sort.
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*/
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void mdb_midl_sort( MDB_IDL ids );
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/** An ID2 is an ID/pointer pair.
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*/
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typedef struct MDB_ID2 {
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MDB_ID mid; /**< The ID */
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void *mptr; /**< The pointer */
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} MDB_ID2;
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/** An ID2L is an ID2 List, a sorted array of ID2s.
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* The first element's \b mid member is a count of how many actual
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* elements are in the array. The \b mptr member of the first element is unused.
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* The array is sorted in ascending order by \b mid.
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*/
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typedef MDB_ID2 *MDB_ID2L;
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/** Search for an ID in an ID2L.
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* @param[in] ids The ID2L to search.
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* @param[in] id The ID to search for.
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* @return The index of the first ID2 whose \b mid member is greater than or equal to \b id.
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*/
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unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id );
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/** Insert an ID2 into a ID2L.
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* @param[in,out] ids The ID2L to insert into.
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* @param[in] id The ID2 to insert.
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* @return 0 on success, -1 if the ID was already present in the ID2L.
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*/
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int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id );
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/** Append an ID2 into a ID2L.
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* @param[in,out] ids The ID2L to append into.
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* @param[in] id The ID2 to append.
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* @return 0 on success, -2 if the ID2L is too big.
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*/
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int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id );
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#ifdef MDB_VL32
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typedef struct MDB_ID3 {
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MDB_ID mid; /**< The ID */
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void *mptr; /**< The pointer */
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unsigned int mcnt; /**< Number of pages */
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unsigned int mref; /**< Refcounter */
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} MDB_ID3;
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typedef MDB_ID3 *MDB_ID3L;
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unsigned mdb_mid3l_search( MDB_ID3L ids, MDB_ID id );
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int mdb_mid3l_insert( MDB_ID3L ids, MDB_ID3 *id );
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#endif /* MDB_VL32 */
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/** @} */
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _MDB_MIDL_H_ */
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