bt_conv.c

00001 /*-
00002  * See the file LICENSE for redistribution information.
00003  *
00004  * Copyright (c) 1996, 1997, 1998, 1999, 2000
00005  * Sleepycat Software. All rights reserved.
00006  */
00007 
00008 #include "config.h"
00009 
00010 #ifndef lint
00011 static const char revid[] = "$Id: bt__conv_8c-source.html,v 1.1 2008年06月08日 10:13:30 sebdiaz Exp $";
00012 #endif /* not lint */
00013 
00014 #ifndef NO_SYSTEM_INCLUDES
00015 #include <sys/types.h>
00016 #endif
00017 
00018 #include "db_int.h"
00019 #include "db_page.h"
00020 #include "db_swap.h"
00021 #include "btree.h"
00022 
00023 /*
00024  * CDB___bam_pgin --
00025  * Convert host-specific page layout from the host-independent format
00026  * stored on disk.
00027  *
00028  * PUBLIC: int CDB___bam_pgin __P((DB_ENV *, db_pgno_t, void *, DBT *));
00029  */
00030 int
00031 CDB___bam_pgin(dbenv, pg, pp, cookie)
00032 DB_ENV *dbenv;
00033 db_pgno_t pg;
00034 void *pp;
00035 DBT *cookie;
00036 {
00037 DB_PGINFO *pginfo;
00038 PAGE *h;
00039 
00040 pginfo = (DB_PGINFO *)cookie->data;
00041 if (!pginfo->needswap)
00042 return (0);
00043 
00044 h = pp;
00045 return (TYPE(h) == P_BTREEMETA ? CDB___bam_mswap(pp) :
00046 CDB___db_byteswap(dbenv, pg, pp, pginfo->db_pagesize, 1));
00047 }
00048 
00049 /*
00050  * CDB___bam_pgout --
00051  * Convert host-specific page layout to the host-independent format
00052  * stored on disk.
00053  *
00054  * PUBLIC: int CDB___bam_pgout __P((DB_ENV *, db_pgno_t, void *, DBT *));
00055  */
00056 int
00057 CDB___bam_pgout(dbenv, pg, pp, cookie)
00058 DB_ENV *dbenv;
00059 db_pgno_t pg;
00060 void *pp;
00061 DBT *cookie;
00062 {
00063 DB_PGINFO *pginfo;
00064 PAGE *h;
00065 
00066 pginfo = (DB_PGINFO *)cookie->data;
00067 if (!pginfo->needswap)
00068 return (0);
00069 
00070 h = pp;
00071 return (TYPE(h) == P_BTREEMETA ? CDB___bam_mswap(pp) :
00072 CDB___db_byteswap(dbenv, pg, pp, pginfo->db_pagesize, 0));
00073 }
00074 
00075 /*
00076  * CDB___bam_mswap --
00077  * Swap the bytes on the btree metadata page.
00078  *
00079  * PUBLIC: int CDB___bam_mswap __P((PAGE *));
00080  */
00081 int
00082 CDB___bam_mswap(pg)
00083 PAGE *pg;
00084 {
00085 u_int8_t *p;
00086 
00087 CDB___db_metaswap(pg);
00088 
00089 p = (u_int8_t *)pg + sizeof(DBMETA);
00090 
00091 SWAP32(p); /* maxkey */
00092 SWAP32(p); /* minkey */
00093 SWAP32(p); /* re_len */
00094 SWAP32(p); /* re_pad */
00095 SWAP32(p); /* root */
00096 
00097 return (0);
00098 }