/*- * See the file LICENSE for redistribution information. * * Copyright (c) 1996-2002 * Sleepycat Software. All rights reserved. */ #include "db_config.h" #ifndef lint static const char revid[] = "$Id: hash_conv.c,v 11.13 2002/08/06 05:34:35 bostic Exp $"; #endif /* not lint */ #ifndef NO_SYSTEM_INCLUDES #include <sys/types.h> #endif #include "db_int.h" #include "dbinc/db_page.h" #include "dbinc/db_swap.h" #include "dbinc/hash.h" /* * __ham_pgin -- * Convert host-specific page layout from the host-independent format * stored on disk. * * PUBLIC: int __ham_pgin __P((DB_ENV *, DB *, db_pgno_t, void *, DBT *)); */ int __ham_pgin(dbenv, dummydbp, pg, pp, cookie) DB_ENV *dbenv; DB *dummydbp; db_pgno_t pg; void *pp; DBT *cookie; { DB_PGINFO *pginfo; PAGE *h; h = pp; pginfo = (DB_PGINFO *)cookie->data; /* * The hash access method does blind reads of pages, causing them * to be created. If the type field isn't set it's one of them, * initialize the rest of the page and return. */ if (h->type != P_HASHMETA && h->pgno == PGNO_INVALID) { P_INIT(pp, (db_indx_t)pginfo->db_pagesize, pg, PGNO_INVALID, PGNO_INVALID, 0, P_HASH); return (0); } if (!F_ISSET(pginfo, DB_AM_SWAP)) return (0); return (h->type == P_HASHMETA ? __ham_mswap(pp) : __db_byteswap(dbenv, dummydbp, pg, pp, pginfo->db_pagesize, 1)); } /* * __ham_pgout -- * Convert host-specific page layout to the host-independent format * stored on disk. * * PUBLIC: int __ham_pgout __P((DB_ENV *, DB *, db_pgno_t, void *, DBT *)); */ int __ham_pgout(dbenv, dummydbp, pg, pp, cookie) DB_ENV *dbenv; DB *dummydbp; db_pgno_t pg; void *pp; DBT *cookie; { DB_PGINFO *pginfo; PAGE *h; pginfo = (DB_PGINFO *)cookie->data; if (!F_ISSET(pginfo, DB_AM_SWAP)) return (0); h = pp; return (h->type == P_HASHMETA ? __ham_mswap(pp) : __db_byteswap(dbenv, dummydbp, pg, pp, pginfo->db_pagesize, 0)); } /* * __ham_mswap -- * Swap the bytes on the hash metadata page. * * PUBLIC: int __ham_mswap __P((void *)); */ int __ham_mswap(pg) void *pg; { u_int8_t *p; int i; __db_metaswap(pg); p = (u_int8_t *)pg + sizeof(DBMETA); SWAP32(p); /* max_bucket */ SWAP32(p); /* high_mask */ SWAP32(p); /* low_mask */ SWAP32(p); /* ffactor */ SWAP32(p); /* nelem */ SWAP32(p); /* h_charkey */ for (i = 0; i < NCACHED; ++i) SWAP32(p); /* spares */ p += 59 * sizeof(u_int32_t); /* unusued */ SWAP32(p); /* crypto_magic */ return (0); }