diff options
Diffstat (limited to 'db2/btree/bt_conv.c')
| -rw-r--r-- | db2/btree/bt_conv.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/db2/btree/bt_conv.c b/db2/btree/bt_conv.c new file mode 100644 index 0000000000..537e2f98ec --- /dev/null +++ b/db2/btree/bt_conv.c @@ -0,0 +1,83 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997 + * Sleepycat Software. All rights reserved. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)bt_conv.c 10.3 (Sleepycat) 8/9/97"; +#endif /* not lint */ + +#ifndef NO_SYSTEM_INCLUDES +#include <sys/types.h> +#endif + +#include "db_int.h" +#include "db_page.h" +#include "db_swap.h" +#include "btree.h" + +/* + * __bam_pgin, __bam_pgout -- + * Convert host-specific page layout to/from the host-independent + * format stored on disk. + * + * PUBLIC: int __bam_pgin __P((db_pgno_t, void *, DBT *)); + * PUBLIC: int __bam_pgout __P((db_pgno_t, void *, DBT *)); + */ +int +__bam_pgin(pg, pp, cookie) + db_pgno_t pg; + void *pp; + DBT *cookie; +{ + DB_PGINFO *pginfo; + + pginfo = (DB_PGINFO *)cookie->data; + if (!pginfo->needswap) + return (0); + return (pg == PGNO_METADATA ? __bam_mswap(pp) : __db_pgin(pg, pp)); +} + +int +__bam_pgout(pg, pp, cookie) + db_pgno_t pg; + void *pp; + DBT *cookie; +{ + DB_PGINFO *pginfo; + + pginfo = (DB_PGINFO *)cookie->data; + if (!pginfo->needswap) + return (0); + return (pg == PGNO_METADATA ? __bam_mswap(pp) : __db_pgout(pg, pp)); +} + +/* + * __bam_mswap -- + * Swap the bytes on the btree metadata page. + * + * PUBLIC: int __bam_mswap __P((PAGE *)); + */ +int +__bam_mswap(pg) + PAGE *pg; +{ + u_int8_t *p; + + p = (u_int8_t *)pg; + SWAP32(p); /* lsn.file */ + SWAP32(p); /* lsn.offset */ + SWAP32(p); /* pgno */ + SWAP32(p); /* magic */ + SWAP32(p); /* version */ + SWAP32(p); /* pagesize */ + SWAP32(p); /* maxkey */ + SWAP32(p); /* minkey */ + SWAP32(p); /* free */ + SWAP32(p); /* flags */ + return (0); +} |