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36 * @(#)bt_conv.c 8.5 (Berkeley) 8/17/94
39 #include <sys/param.h>
46 static void mswap __P((PAGE *));
49 * __BT_BPGIN, __BT_BPGOUT --
50 * Convert host-specific number layout to/from the host-independent
51 * format stored on disk.
69 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
85 if ((h->flags & P_TYPE) == P_BINTERNAL)
86 for (i = 0; i < top; i++) {
87 M_16_SWAP(h->linp[i]);
88 p = (char *)GETBINTERNAL(h, i);
90 p += sizeof(u_int32_t);
93 if (*(u_char *)p & P_BIGKEY) {
100 else if ((h->flags & P_TYPE) == P_BLEAF)
101 for (i = 0; i < top; i++) {
102 M_16_SWAP(h->linp[i]);
103 p = (char *)GETBLEAF(h, i);
105 p += sizeof(u_int32_t);
107 p += sizeof(u_int32_t);
108 flags = *(u_char *)p;
109 if (flags & (P_BIGKEY | P_BIGDATA)) {
111 if (flags & P_BIGKEY) {
116 if (flags & P_BIGDATA) {
117 p += sizeof(u_int32_t);
127 __bt_pgout(t, pg, pp)
137 if (!F_ISSET(((BTREE *)t), B_NEEDSWAP))
146 if ((h->flags & P_TYPE) == P_BINTERNAL)
147 for (i = 0; i < top; i++) {
148 p = (char *)GETBINTERNAL(h, i);
150 p += sizeof(u_int32_t);
153 if (*(u_char *)p & P_BIGKEY) {
159 M_16_SWAP(h->linp[i]);
161 else if ((h->flags & P_TYPE) == P_BLEAF)
162 for (i = 0; i < top; i++) {
163 p = (char *)GETBLEAF(h, i);
165 p += sizeof(u_int32_t);
167 p += sizeof(u_int32_t);
168 flags = *(u_char *)p;
169 if (flags & (P_BIGKEY | P_BIGDATA)) {
171 if (flags & P_BIGKEY) {
176 if (flags & P_BIGDATA) {
177 p += sizeof(u_int32_t);
183 M_16_SWAP(h->linp[i]);
187 M_32_SWAP(h->prevpg);
188 M_32_SWAP(h->nextpg);
195 * MSWAP -- Actually swap the bytes on the meta page.
207 P_32_SWAP(p); /* magic */
208 p += sizeof(u_int32_t);
209 P_32_SWAP(p); /* version */
210 p += sizeof(u_int32_t);
211 P_32_SWAP(p); /* psize */
212 p += sizeof(u_int32_t);
213 P_32_SWAP(p); /* free */
214 p += sizeof(u_int32_t);
215 P_32_SWAP(p); /* nrecs */
216 p += sizeof(u_int32_t);
217 P_32_SWAP(p); /* flags */
218 p += sizeof(u_int32_t);