+ if (p && p->size)
+ {
+ char file_item_buf[DST_ITEM_MAX];
+ char *file_item = file_item_buf;
+
+ src = p->bytes;
+ endp = p->bytes + p->size;
+ (*b->method->code_item)(ISAMC_DECODE, c1, &file_item, &src);
+ while (1)
+ {
+ char *dst_item = 0;
+ char *dst_0 = dst;
+ char *lookahead_next;
+ int d = -1;
+
+ if (lookahead_item)
+ d = (*b->method->compare_item)(file_item_buf, lookahead_item);
+
+ if (d > 0)
+ {
+ dst_item = lookahead_item;
+ assert (*lookahead_mode);
+ }
+ else
+ dst_item = file_item_buf;
+ if (!*lookahead_mode && d == 0)
+ {
+ p->dirty = 1;
+ }
+ else if (!half1 && dst > cut)
+ {
+ char *dst_item_0 = dst_item;
+ half1 = dst; /* candidate for splitting */
+
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &dst_item);
+
+ cut_item_size = dst_item - dst_item_0;
+ memcpy (cut_item_buf, dst_item_0, cut_item_size);
+
+ half2 = dst;
+ }
+ else
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &dst_item);
+ if (d > 0)
+ {
+ if (dst > maxp)
+ {
+ dst = dst_0;
+ lookahead_item = 0;
+ }
+ else
+ {
+ lookahead_next = lookahead_item;
+ if (!(*stream->read_item)(stream->clientData,
+ &lookahead_next,
+ lookahead_mode))
+ {
+ lookahead_item = 0;
+ more = 0;
+ }
+ if (lookahead_item && max_item &&
+ (*b->method->compare_item)(max_item, lookahead_item) <= 0)
+ {
+ /* max_item 1 */
+ lookahead_item = 0;
+ }
+
+ p->dirty = 1;
+ }
+ }
+ else if (d == 0)
+ {
+ lookahead_next = lookahead_item;
+ if (!(*stream->read_item)(stream->clientData,
+ &lookahead_next, lookahead_mode))
+ {
+ lookahead_item = 0;
+ more = 0;
+ }
+ if (src == endp)
+ break;
+ file_item = file_item_buf;
+ (*b->method->code_item)(ISAMC_DECODE, c1, &file_item, &src);
+ }
+ else
+ {
+ if (src == endp)
+ break;
+ file_item = file_item_buf;
+ (*b->method->code_item)(ISAMC_DECODE, c1, &file_item, &src);
+ }
+ }
+ }
+ maxp = dst_buf + b->file[b->no_cat-1].head.block_max + quater;
+ while (lookahead_item)
+ {
+ char *dst_item = lookahead_item;
+ char *dst_0 = dst;
+
+ if (max_item &&
+ (*b->method->compare_item)(max_item, lookahead_item) <= 0)
+ {
+ /* max_item 2 */
+ break;
+ }
+ if (!*lookahead_mode)
+ {
+ yaz_log (LOG_WARN, "Inconsistent register (2)");
+ abort();
+ }
+ else if (!half1 && dst > cut)
+ {
+ char *dst_item_0 = dst_item;
+ half1 = dst; /* candidate for splitting */
+
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &dst_item);
+
+ cut_item_size = dst_item - dst_item_0;
+ memcpy (cut_item_buf, dst_item_0, cut_item_size);
+
+ half2 = dst;
+ }
+ else
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &dst_item);
+
+ if (dst > maxp)
+ {
+ dst = dst_0;
+ break;
+ }
+ if (p)
+ p->dirty = 1;
+ dst_item = lookahead_item;
+ if (!(*stream->read_item)(stream->clientData, &dst_item,
+ lookahead_mode))
+ {
+ lookahead_item = 0;
+ more = 0;
+ }
+ }
+ new_size = dst - dst_buf;
+ if (p && p->cat != b->no_cat-1 &&
+ new_size > b->file[p->cat].head.block_max)
+ {
+ /* non-btree block will be removed */
+ p->deleted = 1;
+ close_block (b, p);
+ /* delete it too!! */
+ p = 0; /* make a new one anyway */
+ }