--- /dev/null
+/** @file midl.h
+ * @brief LMDB ID List header file.
+ *
+ * This file was originally part of back-bdb but has been
+ * modified for use in libmdb. Most of the macros defined
+ * in this file are unused, just left over from the original.
+ *
+ * This file is only used internally in libmdb and its definitions
+ * are not exposed publicly.
+ */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2021 The OpenLDAP Foundation.
+ * Portions Copyright 2001-2021 Howard Chu, Symas Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _MDB_MIDL_H_
+#define _MDB_MIDL_H_
+
+#include "lmdb.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @defgroup internal LMDB Internals
+ * @{
+ */
+
+/** @defgroup idls ID List Management
+ * @{
+ */
+ /** A generic unsigned ID number. These were entryIDs in back-bdb.
+ * Preferably it should have the same size as a pointer.
+ */
+typedef mdb_size_t MDB_ID;
+
+ /** An IDL is an ID List, a sorted array of IDs. The first
+ * element of the array is a counter for how many actual
+ * IDs are in the list. In the original back-bdb code, IDLs are
+ * sorted in ascending order. For libmdb IDLs are sorted in
+ * descending order.
+ */
+typedef MDB_ID *MDB_IDL;
+
+/* IDL sizes - likely should be even bigger
+ * limiting factors: sizeof(ID), thread stack size
+ */
+#ifndef MDB_IDL_LOGN
+#define MDB_IDL_LOGN 16 /* DB_SIZE is 2^16, UM_SIZE is 2^17 */
+#endif
+#define MDB_IDL_DB_SIZE (1<<MDB_IDL_LOGN)
+#define MDB_IDL_UM_SIZE (1<<(MDB_IDL_LOGN+1))
+
+#define MDB_IDL_DB_MAX (MDB_IDL_DB_SIZE-1)
+#define MDB_IDL_UM_MAX (MDB_IDL_UM_SIZE-1)
+
+#define MDB_IDL_SIZEOF(ids) (((ids)[0]+1) * sizeof(MDB_ID))
+#define MDB_IDL_IS_ZERO(ids) ( (ids)[0] == 0 )
+#define MDB_IDL_CPY( dst, src ) (memcpy( dst, src, MDB_IDL_SIZEOF( src ) ))
+#define MDB_IDL_FIRST( ids ) ( (ids)[1] )
+#define MDB_IDL_LAST( ids ) ( (ids)[(ids)[0]] )
+
+ /** Current max length of an #mdb_midl_alloc()ed IDL */
+#define MDB_IDL_ALLOCLEN( ids ) ( (ids)[-1] )
+
+ /** Append ID to IDL. The IDL must be big enough. */
+#define mdb_midl_xappend(idl, id) do { \
+ MDB_ID *xidl = (idl), xlen = ++(xidl[0]); \
+ xidl[xlen] = (id); \
+ } while (0)
+
+ /** Search for an ID in an IDL.
+ * @param[in] ids The IDL to search.
+ * @param[in] id The ID to search for.
+ * @return The index of the first ID greater than or equal to \b id.
+ */
+unsigned mdb_midl_search( MDB_IDL ids, MDB_ID id );
+
+ /** Allocate an IDL.
+ * Allocates memory for an IDL of the given size.
+ * @return IDL on success, NULL on failure.
+ */
+MDB_IDL mdb_midl_alloc(int num);
+
+ /** Free an IDL.
+ * @param[in] ids The IDL to free.
+ */
+void mdb_midl_free(MDB_IDL ids);
+
+ /** Shrink an IDL.
+ * Return the IDL to the default size if it has grown larger.
+ * @param[in,out] idp Address of the IDL to shrink.
+ */
+void mdb_midl_shrink(MDB_IDL *idp);
+
+ /** Make room for num additional elements in an IDL.
+ * @param[in,out] idp Address of the IDL.
+ * @param[in] num Number of elements to make room for.
+ * @return 0 on success, ENOMEM on failure.
+ */
+int mdb_midl_need(MDB_IDL *idp, unsigned num);
+
+ /** Append an ID onto an IDL.
+ * @param[in,out] idp Address of the IDL to append to.
+ * @param[in] id The ID to append.
+ * @return 0 on success, ENOMEM if the IDL is too large.
+ */
+int mdb_midl_append( MDB_IDL *idp, MDB_ID id );
+
+ /** Append an IDL onto an IDL.
+ * @param[in,out] idp Address of the IDL to append to.
+ * @param[in] app The IDL to append.
+ * @return 0 on success, ENOMEM if the IDL is too large.
+ */
+int mdb_midl_append_list( MDB_IDL *idp, MDB_IDL app );
+
+ /** Append an ID range onto an IDL.
+ * @param[in,out] idp Address of the IDL to append to.
+ * @param[in] id The lowest ID to append.
+ * @param[in] n Number of IDs to append.
+ * @return 0 on success, ENOMEM if the IDL is too large.
+ */
+int mdb_midl_append_range( MDB_IDL *idp, MDB_ID id, unsigned n );
+
+ /** Merge an IDL onto an IDL. The destination IDL must be big enough.
+ * @param[in] idl The IDL to merge into.
+ * @param[in] merge The IDL to merge.
+ */
+void mdb_midl_xmerge( MDB_IDL idl, MDB_IDL merge );
+
+ /** Sort an IDL.
+ * @param[in,out] ids The IDL to sort.
+ */
+void mdb_midl_sort( MDB_IDL ids );
+
+ /** An ID2 is an ID/pointer pair.
+ */
+typedef struct MDB_ID2 {
+ MDB_ID mid; /**< The ID */
+ void *mptr; /**< The pointer */
+} MDB_ID2;
+
+ /** An ID2L is an ID2 List, a sorted array of ID2s.
+ * The first element's \b mid member is a count of how many actual
+ * elements are in the array. The \b mptr member of the first element is unused.
+ * The array is sorted in ascending order by \b mid.
+ */
+typedef MDB_ID2 *MDB_ID2L;
+
+ /** Search for an ID in an ID2L.
+ * @param[in] ids The ID2L to search.
+ * @param[in] id The ID to search for.
+ * @return The index of the first ID2 whose \b mid member is greater than or equal to \b id.
+ */
+unsigned mdb_mid2l_search( MDB_ID2L ids, MDB_ID id );
+
+
+ /** Insert an ID2 into a ID2L.
+ * @param[in,out] ids The ID2L to insert into.
+ * @param[in] id The ID2 to insert.
+ * @return 0 on success, -1 if the ID was already present in the ID2L.
+ */
+int mdb_mid2l_insert( MDB_ID2L ids, MDB_ID2 *id );
+
+ /** Append an ID2 into a ID2L.
+ * @param[in,out] ids The ID2L to append into.
+ * @param[in] id The ID2 to append.
+ * @return 0 on success, -2 if the ID2L is too big.
+ */
+int mdb_mid2l_append( MDB_ID2L ids, MDB_ID2 *id );
+
+#ifdef MDB_VL32
+typedef struct MDB_ID3 {
+ MDB_ID mid; /**< The ID */
+ void *mptr; /**< The pointer */
+ unsigned int mcnt; /**< Number of pages */
+ unsigned int mref; /**< Refcounter */
+} MDB_ID3;
+
+typedef MDB_ID3 *MDB_ID3L;
+
+unsigned mdb_mid3l_search( MDB_ID3L ids, MDB_ID id );
+int mdb_mid3l_insert( MDB_ID3L ids, MDB_ID3 *id );
+
+#endif /* MDB_VL32 */
+/** @} */
+/** @} */
+#ifdef __cplusplus
+}
+#endif
+#endif /* _MDB_MIDL_H_ */
projects / ziglmdb / blobdiff