+ else {
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isamb_pp_on_right returning false "
+ "cmp=%d lev=%d ofs=%d",cmp,level,p->offset);
+#endif
+ return 0;
+ }
+ }
+ else {
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isamb_pp_on_right at tail, looking higher "
+ "lev=%d",level);
+#endif
+ return isamb_pp_on_right_node(pp, level, untilbuf);
+ }
+} /* isamb_pp_on_right_node */
+
+static int isamb_pp_read_on_leaf(ISAMB_PP pp, void *buf)
+{ /* reads the next item on the current leaf, returns 0 if end of leaf*/
+ struct ISAMB_block *p = pp->block[pp->level];
+ char *dst;
+ const char *src;
+ assert(pp);
+ assert(buf);
+ if (p->offset == p->size) {
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isamb_pp_read_on_leaf returning 0 on node %d",p->pos);
+#endif
+ return 0; /* at end of leaf */
+ }
+ src=p->bytes + p->offset;
+ dst=buf;
+ (*pp->isamb->method->codec.decode)(p->decodeClientData,&dst, &src);
+ p->offset = src - (char*) p->bytes;
+#if ISAMB_DEBUG
+ (*pp->isamb->method->codec.log_item)(LOG_DEBUG, buf, "read_on_leaf returning 1");
+#endif
+ pp->returned_numbers++;
+ return 1;
+} /* read_on_leaf */
+
+static int isamb_pp_forward_on_leaf(ISAMB_PP pp, void *buf, const void *untilbuf)
+{ /* forwards on the current leaf, returns 0 if not found */
+ int cmp;
+ int skips=0;
+ while (1){
+ if (!isamb_pp_read_on_leaf(pp,buf))
+ return 0;
+ /* FIXME - this is an extra function call, inline the read? */
+ cmp=(*pp->isamb->method->compare_item)(untilbuf,buf);
+ if (cmp <pp->scope){ /* cmp<2 found a good one */
+#if ISAMB_DEBUG
+ if (skips)
+ logf(LOG_DEBUG, "isam_pp_fwd_on_leaf skipped %d items",skips);
+#endif
+ pp->returned_numbers++;
+ return 1;
+ }
+ if (!skips)
+ if (!isamb_pp_on_right_node(pp, pp->level, untilbuf))
+ return 0; /* never mind the rest of this leaf */
+ pp->skipped_numbers++;
+ skips++;
+ }
+} /* forward_on_leaf */
+
+static int isamb_pp_climb_level(ISAMB_PP pp, ISAMB_P *pos)
+{ /* climbs higher in the tree, until finds a level with data left */
+ /* returns the node to (consider to) descend to in *pos) */
+ struct ISAMB_block *p = pp->block[pp->level];
+ const char *src;
+ zint item_len;
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isamb_pp_climb_level starting "
+ "at level %d node %d ofs=%d sz=%d",
+ pp->level, p->pos, p->offset, p->size);
+#endif
+ assert(pp->level >= 0);
+ assert(p->offset <= p->size);
+ if (pp->level==0)
+ {
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isamb_pp_climb_level returning 0 at root");
+#endif
+ return 0;
+ }
+ assert(pp->level>0);
+ close_block(pp->isamb, pp->block[pp->level]);
+ pp->block[pp->level]=0;
+ (pp->level)--;
+ p=pp->block[pp->level];
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isamb_pp_climb_level climbed to level %d node %d ofs=%d",
+ pp->level, p->pos, p->offset);
+#endif
+ assert(!p->leaf);
+ assert(p->offset <= p->size);
+ if (p->offset == p->size ) {
+ /* we came from the last pointer, climb on */
+ if (!isamb_pp_climb_level(pp,pos))
+ return 0;
+ p=pp->block[pp->level];
+ }
+ else
+ {
+ /* skip the child we just came from */
+#if ISAMB_DEBUG
+ logf(LOG_DEBUG,"isam_pp_climb_level: skipping lev=%d ofs=%d sz=%d",
+ pp->level, p->offset, p->size);
+#endif
+ assert (p->offset < p->size );
+ src=p->bytes + p->offset;
+ decode_ptr(&src, &item_len);