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5 * This code is derived from software contributed to Berkeley by
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36 * @(#)bt_conv.c 8.5 (Berkeley) 8/17/94
37 * $DragonFly: src/lib/libc/db/btree/bt_conv.c,v 1.4 2003/11/12 20:21:22 eirikn Exp $
40 #include <sys/param.h>
47 static void mswap (PAGE *);
50 * __BT_BPGIN, __BT_BPGOUT --
51 * Convert host-specific number layout to/from the host-independent
52 * format stored on disk.
70 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
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 *)GETBINTERNAL(h, i);
91 p += sizeof(u_int32_t);
94 if (*(u_char *)p & P_BIGKEY) {
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 *)GETBLEAF(h, i);
106 p += sizeof(u_int32_t);
108 p += sizeof(u_int32_t);
109 flags = *(u_char *)p;
110 if (flags & (P_BIGKEY | P_BIGDATA)) {
112 if (flags & P_BIGKEY) {
117 if (flags & P_BIGDATA) {
118 p += sizeof(u_int32_t);
128 __bt_pgout(t, pg, pp)
138 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
147 if ((h->flags & P_TYPE) == P_BINTERNAL)
148 for (i = 0; i < top; i++) {
149 p = (char *)GETBINTERNAL(h, i);
151 p += sizeof(u_int32_t);
154 if (*(u_char *)p & P_BIGKEY) {
160 M_16_SWAP(h->linp[i]);
162 else if ((h->flags & P_TYPE) == P_BLEAF)
163 for (i = 0; i < top; i++) {
164 p = (char *)GETBLEAF(h, i);
166 p += sizeof(u_int32_t);
168 p += sizeof(u_int32_t);
169 flags = *(u_char *)p;
170 if (flags & (P_BIGKEY | P_BIGDATA)) {
172 if (flags & P_BIGKEY) {
177 if (flags & P_BIGDATA) {
178 p += sizeof(u_int32_t);
184 M_16_SWAP(h->linp[i]);
188 M_32_SWAP(h->prevpg);
189 M_32_SWAP(h->nextpg);
196 * MSWAP -- Actually swap the bytes on the meta page.
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);