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author | Lorry <lorry@roadtrain.codethink.co.uk> | 2012-07-20 20:00:05 +0100 |
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committer | Lorry <lorry@roadtrain.codethink.co.uk> | 2012-07-20 20:00:05 +0100 |
commit | 3ef782d3745ea8f25a3151561a3cfb882190210e (patch) | |
tree | 86b9c2f5fde051dd0bced99b3fc9f5a3ba08db69 /src/hash/hash_conv.c | |
download | berkeleydb-3ef782d3745ea8f25a3151561a3cfb882190210e.tar.gz |
Tarball conversion
Diffstat (limited to 'src/hash/hash_conv.c')
-rw-r--r-- | src/hash/hash_conv.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/hash/hash_conv.c b/src/hash/hash_conv.c new file mode 100644 index 00000000..fa084f2a --- /dev/null +++ b/src/hash/hash_conv.c @@ -0,0 +1,110 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 2012 Oracle and/or its affiliates. All rights reserved. + * + * $Id$ + */ + +#include "db_config.h" + +#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 *, db_pgno_t, void *, DBT *)); + */ +int +__ham_pgin(dbp, pg, pp, cookie) + DB *dbp; + 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(dbp->env, pp) : + __db_byteswap(dbp, 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 *, db_pgno_t, void *, DBT *)); + */ +int +__ham_pgout(dbp, pg, pp, cookie) + DB *dbp; + 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(dbp->env, pp) : + __db_byteswap(dbp, pg, pp, pginfo->db_pagesize, 0)); +} + +/* + * __ham_mswap -- + * Swap the bytes on the hash metadata page. + * + * PUBLIC: int __ham_mswap __P((ENV *, void *)); + */ +int +__ham_mswap(env, pg) + ENV *env; + void *pg; +{ + u_int8_t *p; + int i; + + COMPQUIET(env, NULL); + + __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); /* unused */ + SWAP32(p); /* crypto_magic */ + return (0); +} |