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32 * @(#)bt_conv.c 8.5 (Berkeley) 8/17/94
33 * $DragonFly: src/lib/libc/db/btree/bt_conv.c,v 1.6 2005/11/12 23:01:54 swildner Exp $
36 #include <sys/param.h>
43 static void mswap (PAGE *);
46 * __BT_BPGIN, __BT_BPGOUT --
47 * Convert host-specific number layout to/from the host-independent
48 * format stored on disk.
56 __bt_pgin(void *t, pgno_t pg, void *pp)
63 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
79 if ((h->flags & P_TYPE) == P_BINTERNAL)
80 for (i = 0; i < top; i++) {
81 M_16_SWAP(h->linp[i]);
82 p = (char *)GETBINTERNAL(h, i);
84 p += sizeof(u_int32_t);
87 if (*(u_char *)p & P_BIGKEY) {
94 else if ((h->flags & P_TYPE) == P_BLEAF)
95 for (i = 0; i < top; i++) {
96 M_16_SWAP(h->linp[i]);
97 p = (char *)GETBLEAF(h, i);
99 p += sizeof(u_int32_t);
101 p += sizeof(u_int32_t);
102 flags = *(u_char *)p;
103 if (flags & (P_BIGKEY | P_BIGDATA)) {
105 if (flags & P_BIGKEY) {
110 if (flags & P_BIGDATA) {
111 p += sizeof(u_int32_t);
121 __bt_pgout(void *t, pgno_t pg, void *pp)
128 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
137 if ((h->flags & P_TYPE) == P_BINTERNAL)
138 for (i = 0; i < top; i++) {
139 p = (char *)GETBINTERNAL(h, i);
141 p += sizeof(u_int32_t);
144 if (*(u_char *)p & P_BIGKEY) {
150 M_16_SWAP(h->linp[i]);
152 else if ((h->flags & P_TYPE) == P_BLEAF)
153 for (i = 0; i < top; i++) {
154 p = (char *)GETBLEAF(h, i);
156 p += sizeof(u_int32_t);
158 p += sizeof(u_int32_t);
159 flags = *(u_char *)p;
160 if (flags & (P_BIGKEY | P_BIGDATA)) {
162 if (flags & P_BIGKEY) {
167 if (flags & P_BIGDATA) {
168 p += sizeof(u_int32_t);
174 M_16_SWAP(h->linp[i]);
178 M_32_SWAP(h->prevpg);
179 M_32_SWAP(h->nextpg);
186 * MSWAP -- Actually swap the bytes on the meta page.
197 P_32_SWAP(p); /* magic */
198 p += sizeof(u_int32_t);
199 P_32_SWAP(p); /* version */
200 p += sizeof(u_int32_t);
201 P_32_SWAP(p); /* psize */
202 p += sizeof(u_int32_t);
203 P_32_SWAP(p); /* free */
204 p += sizeof(u_int32_t);
205 P_32_SWAP(p); /* nrecs */
206 p += sizeof(u_int32_t);
207 P_32_SWAP(p); /* flags */
208 p += sizeof(u_int32_t);