/* * CDE - Common Desktop Environment * * Copyright (c) 1993-2012, The Open Group. All rights reserved. * * These libraries and programs are free software; you can * redistribute them and/or modify them under the terms of the GNU * Lesser General Public License as published by the Free Software * Foundation; either version 2 of the License, or (at your option) * any later version. * * These libraries and programs are distributed in the hope that * they will be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR * PURPOSE. See the GNU Lesser General Public License for more * details. * * You should have received a copy of the GNU Lesser General Public * License along with these libraries and programs; if not, write * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth * Floor, Boston, MA 02110-1301 USA */ /* $XConsortium: bt_conv.c /main/3 1996/06/11 17:12:19 cde-hal $ */ /*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Mike Olson. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)bt_conv.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include "btree.h" static void mswap __P((PAGE *)); /* * __BT_BPGIN, __BT_BPGOUT -- * Convert host-specific number layout to/from the host-independent * format stored on disk. * * Parameters: * t: tree * pg: page number * h: page to convert */ void __bt_pgin(void *t, pgno_t pg, void *pp) { PAGE *h; int i, top; u_char flags; char *p; if (!ISSET(((BTREE *)t), B_NEEDSWAP)) return; if (pg == P_META) { mswap(pp); return; } h = pp; BLSWAP(h->pgno); BLSWAP(h->prevpg); BLSWAP(h->nextpg); BLSWAP(h->flags); BSSWAP(h->lower); BSSWAP(h->upper); top = NEXTINDEX(h); if ((h->flags & P_TYPE) == P_BINTERNAL) for (i = 0; i < top; i++) { BSSWAP(h->linp[i]); p = (char *)GETBINTERNAL(h, i); BLPSWAP(p); p += sizeof(size_t); BLPSWAP(p); p += sizeof(pgno_t); if (*(u_char *)p & P_BIGKEY) { p += sizeof(u_char); BLPSWAP(p); p += sizeof(pgno_t); BLPSWAP(p); } } else if ((h->flags & P_TYPE) == P_BLEAF) for (i = 0; i < top; i++) { BSSWAP(h->linp[i]); p = (char *)GETBLEAF(h, i); BLPSWAP(p); p += sizeof(size_t); BLPSWAP(p); p += sizeof(size_t); flags = *(u_char *)p; if (flags & (P_BIGKEY | P_BIGDATA)) { p += sizeof(u_char); if (flags & P_BIGKEY) { BLPSWAP(p); p += sizeof(pgno_t); BLPSWAP(p); } if (flags & P_BIGDATA) { p += sizeof(size_t); BLPSWAP(p); p += sizeof(pgno_t); BLPSWAP(p); } } } } void __bt_pgout(void *t, pgno_t pg, void *pp) { PAGE *h; int i, top; u_char flags; char *p; if (!ISSET(((BTREE *)t), B_NEEDSWAP)) return; if (pg == P_META) { mswap(pp); return; } h = pp; top = NEXTINDEX(h); if ((h->flags & P_TYPE) == P_BINTERNAL) for (i = 0; i < top; i++) { p = (char *)GETBINTERNAL(h, i); BLPSWAP(p); p += sizeof(size_t); BLPSWAP(p); p += sizeof(pgno_t); if (*(u_char *)p & P_BIGKEY) { p += sizeof(u_char); BLPSWAP(p); p += sizeof(pgno_t); BLPSWAP(p); } BSSWAP(h->linp[i]); } else if ((h->flags & P_TYPE) == P_BLEAF) for (i = 0; i < top; i++) { p = (char *)GETBLEAF(h, i); BLPSWAP(p); p += sizeof(size_t); BLPSWAP(p); p += sizeof(size_t); flags = *(u_char *)p; if (flags & (P_BIGKEY | P_BIGDATA)) { p += sizeof(u_char); if (flags & P_BIGKEY) { BLPSWAP(p); p += sizeof(pgno_t); BLPSWAP(p); } if (flags & P_BIGDATA) { p += sizeof(size_t); BLPSWAP(p); p += sizeof(pgno_t); BLPSWAP(p); } } BSSWAP(h->linp[i]); } BLSWAP(h->pgno); BLSWAP(h->prevpg); BLSWAP(h->nextpg); BLSWAP(h->flags); BSSWAP(h->lower); BSSWAP(h->upper); } /* * MSWAP -- Actually swap the bytes on the meta page. * * Parameters: * p: page to convert */ static void mswap(PAGE *pg) { char *p; p = (char *)pg; BLPSWAP(p); /* m_magic */ p += sizeof(u_long); BLPSWAP(p); /* m_version */ p += sizeof(u_long); BLPSWAP(p); /* m_psize */ p += sizeof(u_long); BLPSWAP(p); /* m_free */ p += sizeof(u_long); BLPSWAP(p); /* m_nrecs */ p += sizeof(u_long); BLPSWAP(p); /* m_flags */ p += sizeof(u_long); }