bt_conv.c revision 1.12
1 /* $NetBSD: bt_conv.c,v 1.12 2007/02/03 23:46:09 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Olson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if HAVE_NBTOOL_CONFIG_H 36 #include "nbtool_config.h" 37 #endif 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)bt_conv.c 8.5 (Berkeley) 8/17/94"; 43 #else 44 __RCSID("$NetBSD: bt_conv.c,v 1.12 2007/02/03 23:46:09 christos Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 #include <assert.h> 49 #include <stdio.h> 50 51 #include <db.h> 52 #include "btree.h" 53 54 static void mswap(PAGE *); 55 56 /* 57 * __BT_BPGIN, __BT_BPGOUT -- 58 * Convert host-specific number layout to/from the host-independent 59 * format stored on disk. 60 * 61 * Parameters: 62 * t: tree 63 * pg: page number 64 * h: page to convert 65 */ 66 void 67 __bt_pgin(void *t, pgno_t pg, void *pp) 68 { 69 PAGE *h; 70 indx_t i, top; 71 u_char flags; 72 char *p; 73 74 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP)) 75 return; 76 if (pg == P_META) { 77 mswap(pp); 78 return; 79 } 80 81 h = pp; 82 M_32_SWAP(h->pgno); 83 M_32_SWAP(h->prevpg); 84 M_32_SWAP(h->nextpg); 85 M_32_SWAP(h->flags); 86 M_16_SWAP(h->lower); 87 M_16_SWAP(h->upper); 88 89 top = NEXTINDEX(h); 90 if ((h->flags & P_TYPE) == P_BINTERNAL) 91 for (i = 0; i < top; i++) { 92 M_16_SWAP(h->linp[i]); 93 p = (char *)(void *)GETBINTERNAL(h, i); 94 P_32_SWAP(p); 95 p += sizeof(u_int32_t); 96 P_32_SWAP(p); 97 p += sizeof(pgno_t); 98 if (*(u_char *)p & P_BIGKEY) { 99 p += sizeof(u_char); 100 P_32_SWAP(p); 101 p += sizeof(pgno_t); 102 P_32_SWAP(p); 103 } 104 } 105 else if ((h->flags & P_TYPE) == P_BLEAF) 106 for (i = 0; i < top; i++) { 107 M_16_SWAP(h->linp[i]); 108 p = (char *)(void *)GETBLEAF(h, i); 109 P_32_SWAP(p); 110 p += sizeof(u_int32_t); 111 P_32_SWAP(p); 112 p += sizeof(u_int32_t); 113 flags = *(u_char *)p; 114 if (flags & (P_BIGKEY | P_BIGDATA)) { 115 p += sizeof(u_char); 116 if (flags & P_BIGKEY) { 117 P_32_SWAP(p); 118 p += sizeof(pgno_t); 119 P_32_SWAP(p); 120 } 121 if (flags & P_BIGDATA) { 122 p += sizeof(u_int32_t); 123 P_32_SWAP(p); 124 p += sizeof(pgno_t); 125 P_32_SWAP(p); 126 } 127 } 128 } 129 } 130 131 void 132 __bt_pgout(void *t, pgno_t pg, void *pp) 133 { 134 PAGE *h; 135 indx_t i, top; 136 u_char flags; 137 char *p; 138 139 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP)) 140 return; 141 if (pg == P_META) { 142 mswap(pp); 143 return; 144 } 145 146 h = pp; 147 top = NEXTINDEX(h); 148 if ((h->flags & P_TYPE) == P_BINTERNAL) 149 for (i = 0; i < top; i++) { 150 p = (char *)(void *)GETBINTERNAL(h, i); 151 P_32_SWAP(p); 152 p += sizeof(u_int32_t); 153 P_32_SWAP(p); 154 p += sizeof(pgno_t); 155 if (*(u_char *)p & P_BIGKEY) { 156 p += sizeof(u_char); 157 P_32_SWAP(p); 158 p += sizeof(pgno_t); 159 P_32_SWAP(p); 160 } 161 M_16_SWAP(h->linp[i]); 162 } 163 else if ((h->flags & P_TYPE) == P_BLEAF) 164 for (i = 0; i < top; i++) { 165 p = (char *)(void *)GETBLEAF(h, i); 166 P_32_SWAP(p); 167 p += sizeof(u_int32_t); 168 P_32_SWAP(p); 169 p += sizeof(u_int32_t); 170 flags = *(u_char *)p; 171 if (flags & (P_BIGKEY | P_BIGDATA)) { 172 p += sizeof(u_char); 173 if (flags & P_BIGKEY) { 174 P_32_SWAP(p); 175 p += sizeof(pgno_t); 176 P_32_SWAP(p); 177 } 178 if (flags & P_BIGDATA) { 179 p += sizeof(u_int32_t); 180 P_32_SWAP(p); 181 p += sizeof(pgno_t); 182 P_32_SWAP(p); 183 } 184 } 185 M_16_SWAP(h->linp[i]); 186 } 187 188 M_32_SWAP(h->pgno); 189 M_32_SWAP(h->prevpg); 190 M_32_SWAP(h->nextpg); 191 M_32_SWAP(h->flags); 192 M_16_SWAP(h->lower); 193 M_16_SWAP(h->upper); 194 } 195 196 /* 197 * MSWAP -- Actually swap the bytes on the meta page. 198 * 199 * Parameters: 200 * p: page to convert 201 */ 202 static void 203 mswap(PAGE *pg) 204 { 205 char *p; 206 207 p = (char *)(void *)pg; 208 P_32_SWAP(p); /* magic */ 209 p += sizeof(u_int32_t); 210 P_32_SWAP(p); /* version */ 211 p += sizeof(u_int32_t); 212 P_32_SWAP(p); /* psize */ 213 p += sizeof(u_int32_t); 214 P_32_SWAP(p); /* free */ 215 p += sizeof(u_int32_t); 216 P_32_SWAP(p); /* nrecs */ 217 p += sizeof(u_int32_t); 218 P_32_SWAP(p); /* flags */ 219 p += sizeof(u_int32_t); 220 } 221
Indexes created Tue Sep 23 22:09:46 GMT 2025