qam_conv.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:1k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: qam_conv.c,v 11.6 2000/11/16 23:40:57 ubell Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #endif
- #include "db_int.h"
- #include "db_page.h"
- #include "qam.h"
- #include "db_swap.h"
- #include "db_am.h"
- /*
- * __qam_mswap --
- * Swap the bytes on the queue metadata page.
- *
- * PUBLIC: int __qam_mswap __P((PAGE *));
- */
- int
- __qam_mswap(pg)
- PAGE *pg;
- {
- u_int8_t *p;
- __db_metaswap(pg);
- p = (u_int8_t *)pg + sizeof(DBMETA);
- SWAP32(p); /* first_recno */
- SWAP32(p); /* cur_recno */
- SWAP32(p); /* re_len */
- SWAP32(p); /* re_pad */
- SWAP32(p); /* rec_page */
- SWAP32(p); /* page_ext */
- return (0);
- }
- /*
- * __qam_pgin_out --
- * Convert host-specific page layout to/from the host-independent format
- * stored on disk.
- * We only need to fix up a few fields in the header
- *
- * PUBLIC: int __qam_pgin_out __P((DB_ENV *, db_pgno_t, void *, DBT *));
- */
- int
- __qam_pgin_out(dbenv, pg, pp, cookie)
- DB_ENV *dbenv;
- db_pgno_t pg;
- void *pp;
- DBT *cookie;
- {
- DB_PGINFO *pginfo;
- QPAGE *h;
- COMPQUIET(pg, 0);
- COMPQUIET(dbenv, NULL);
- pginfo = (DB_PGINFO *)cookie->data;
- if (!pginfo->needswap)
- return (0);
- h = pp;
- if (h->type == P_QAMMETA)
- return (__qam_mswap(pp));
- M_32_SWAP(h->lsn.file);
- M_32_SWAP(h->lsn.offset);
- M_32_SWAP(h->pgno);
- return (0);
- }