1 /* $NetBSD: bt_conv.c,v 1.14 2008/09/10 17:52:35 joerg 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 #ifndef __minix 41 __RCSID("$NetBSD: bt_conv.c,v 1.14 2008/09/10 17:52:35 joerg Exp $"); 42 #endif 43 44 #include <assert.h> 45 #include <stdio.h> 46 47 #include <db.h> 48 #include "btree.h" 49 50 static void mswap(PAGE *); 51 52 /* 53 * __BT_BPGIN, __BT_BPGOUT -- 54 * Convert host-specific number layout to/from the host-independent 55 * format stored on disk. 56 * 57 * Parameters: 58 * t: tree 59 * pg: page number 60 * h: page to convert 61 */ 62 void 63 __bt_pgin(void *t, pgno_t pg, void *pp) 64 { 65 PAGE *h; 66 indx_t i, top; 67 uint8_t flags; 68 char *p; 69 70 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP)) 71 return; 72 if (pg == P_META) { 73 mswap(pp); 74 return; 75 } 76 77 h = pp; 78 M_32_SWAP(h->pgno); 79 M_32_SWAP(h->prevpg); 80 M_32_SWAP(h->nextpg); 81 M_32_SWAP(h->flags); 82 M_16_SWAP(h->lower); 83 M_16_SWAP(h->upper); 84 85 top = NEXTINDEX(h); 86 if ((h->flags & P_TYPE) == P_BINTERNAL) 87 for (i = 0; i < top; i++) { 88 M_16_SWAP(h->linp[i]); 89 p = (char *)(void *)GETBINTERNAL(h, i); 90 P_32_SWAP(p); 91 p += sizeof(uint32_t); 92 P_32_SWAP(p); 93 p += sizeof(pgno_t); 94 if (*(uint8_t *)p & P_BIGKEY) { 95 p += sizeof(uint8_t); 96 P_32_SWAP(p); 97 p += sizeof(pgno_t); 98 P_32_SWAP(p); 99 } 100 } 101 else if ((h->flags & P_TYPE) == P_BLEAF) 102 for (i = 0; i < top; i++) { 103 M_16_SWAP(h->linp[i]); 104 p = (char *)(void *)GETBLEAF(h, i); 105 P_32_SWAP(p); 106 p += sizeof(uint32_t); 107 P_32_SWAP(p); 108 p += sizeof(uint32_t); 109 flags = *(uint8_t *)p; 110 if (flags & (P_BIGKEY | P_BIGDATA)) { 111 p += sizeof(uint8_t); 112 if (flags & P_BIGKEY) { 113 P_32_SWAP(p); 114 p += sizeof(pgno_t); 115 P_32_SWAP(p); 116 } 117 if (flags & P_BIGDATA) { 118 p += sizeof(uint32_t); 119 P_32_SWAP(p); 120 p += sizeof(pgno_t); 121 P_32_SWAP(p); 122 } 123 } 124 } 125 } 126 127 void 128 __bt_pgout(void *t, pgno_t pg, void *pp) 129 { 130 PAGE *h; 131 indx_t i, top; 132 uint8_t flags; 133 char *p; 134 135 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP)) 136 return; 137 if (pg == P_META) { 138 mswap(pp); 139 return; 140 } 141 142 h = pp; 143 top = NEXTINDEX(h); 144 if ((h->flags & P_TYPE) == P_BINTERNAL) 145 for (i = 0; i < top; i++) { 146 p = (char *)(void *)GETBINTERNAL(h, i); 147 P_32_SWAP(p); 148 p += sizeof(uint32_t); 149 P_32_SWAP(p); 150 p += sizeof(pgno_t); 151 if (*(uint8_t *)p & P_BIGKEY) { 152 p += sizeof(uint8_t); 153 P_32_SWAP(p); 154 p += sizeof(pgno_t); 155 P_32_SWAP(p); 156 } 157 M_16_SWAP(h->linp[i]); 158 } 159 else if ((h->flags & P_TYPE) == P_BLEAF) 160 for (i = 0; i < top; i++) { 161 p = (char *)(void *)GETBLEAF(h, i); 162 P_32_SWAP(p); 163 p += sizeof(uint32_t); 164 P_32_SWAP(p); 165 p += sizeof(uint32_t); 166 flags = *(uint8_t *)p; 167 if (flags & (P_BIGKEY | P_BIGDATA)) { 168 p += sizeof(uint8_t); 169 if (flags & P_BIGKEY) { 170 P_32_SWAP(p); 171 p += sizeof(pgno_t); 172 P_32_SWAP(p); 173 } 174 if (flags & P_BIGDATA) { 175 p += sizeof(uint32_t); 176 P_32_SWAP(p); 177 p += sizeof(pgno_t); 178 P_32_SWAP(p); 179 } 180 } 181 M_16_SWAP(h->linp[i]); 182 } 183 184 M_32_SWAP(h->pgno); 185 M_32_SWAP(h->prevpg); 186 M_32_SWAP(h->nextpg); 187 M_32_SWAP(h->flags); 188 M_16_SWAP(h->lower); 189 M_16_SWAP(h->upper); 190 } 191 192 /* 193 * MSWAP -- Actually swap the bytes on the meta page. 194 * 195 * Parameters: 196 * p: page to convert 197 */ 198 static void 199 mswap(PAGE *pg) 200 { 201 char *p; 202 203 p = (char *)(void *)pg; 204 P_32_SWAP(p); /* magic */ 205 p += sizeof(uint32_t); 206 P_32_SWAP(p); /* version */ 207 p += sizeof(uint32_t); 208 P_32_SWAP(p); /* psize */ 209 p += sizeof(uint32_t); 210 P_32_SWAP(p); /* free */ 211 p += sizeof(uint32_t); 212 P_32_SWAP(p); /* nrecs */ 213 p += sizeof(uint32_t); 214 P_32_SWAP(p); /* flags */ 215 p += sizeof(uint32_t); 216 } 217