+ int item_len;
+ int d;
+ decode_ptr (&src, &item_len);
+ d = (*b->method->compare_item)(src, lookahead_item);
+ if (d > 0)
+ {
+ sub_p1 = open_block (b, pos);
+ assert (sub_p1);
+ more = insert_sub (b, &sub_p1, lookahead_item, mode,
+ stream, &sub_p2,
+ sub_item, &sub_size, src);
+ break;
+ }
+ src += item_len;
+ decode_ptr (&src, &pos);
+ }
+ if (!sub_p1)
+ {
+ sub_p1 = open_block (b, pos);
+ assert (sub_p1);
+ more = insert_sub (b, &sub_p1, lookahead_item, mode, stream, &sub_p2,
+ sub_item, &sub_size, last_max_item);
+ }
+ if (sub_p2)
+ {
+ /* there was a split - must insert pointer in this one */
+ char dst_buf[DST_BUF_SIZE];
+ char *dst = dst_buf;
+
+ assert (sub_size < 30 && sub_size > 1);
+
+ memcpy (dst, startp, src - startp);
+
+ dst += src - startp;
+
+ encode_ptr (&dst, sub_size); /* sub length and item */
+ memcpy (dst, sub_item, sub_size);
+ dst += sub_size;
+
+ encode_ptr (&dst, sub_p2->pos); /* pos */
+
+ if (endp - src) /* remaining data */
+ {
+ memcpy (dst, src, endp - src);
+ dst += endp - src;
+ }
+ p->size = dst - dst_buf;
+ if (p->size <= b->file[p->cat].head.block_max)
+ {
+ memcpy (startp, dst_buf, dst - dst_buf);
+ }
+ else
+ {
+ int p_new_size;
+ char *half;
+ src = dst_buf;
+ endp = dst;
+
+ half = src + b->file[p->cat].head.block_size/2;
+ decode_ptr (&src, &pos);
+ while (src <= half)
+ {
+ decode_ptr (&src, split_size);
+ src += *split_size;
+ decode_ptr (&src, &pos);
+ }
+ p_new_size = src - dst_buf;
+ memcpy (p->bytes, dst_buf, p_new_size);
+
+ decode_ptr (&src, split_size);
+ memcpy (split_item, src, *split_size);
+ src += *split_size;
+
+ *sp = new_int (b, p->cat);
+ (*sp)->size = endp - src;
+ memcpy ((*sp)->bytes, src, (*sp)->size);
+
+ p->size = p_new_size;
+ }
+ p->dirty = 1;
+ close_block (b, sub_p2);
+ }
+ close_block (b, sub_p1);
+ return more;
+}
+
+
+int insert_leaf (ISAMB b, struct ISAMB_block **sp1, void *lookahead_item,
+ int *lookahead_mode, ISAMC_I stream, struct ISAMB_block **sp2,
+ void *sub_item, int *sub_size,
+ void *max_item)
+{
+ struct ISAMB_block *p = *sp1;
+ char *src = 0, *endp = 0;
+ char dst_buf[DST_BUF_SIZE], *dst = dst_buf;
+ int new_size;
+ void *c1 = (*b->method->code_start)(ISAMC_DECODE);
+ void *c2 = (*b->method->code_start)(ISAMC_ENCODE);
+ int more = 1;
+ int quater = b->file[b->no_cat-1].head.block_max / 4;
+ char *cut = dst_buf + quater * 2;
+ char *maxp = dst_buf + b->file[b->no_cat-1].head.block_max;
+ char *half1 = 0;
+ char *half2 = 0;
+ char cut_item_buf[DST_ITEM_MAX];
+ int cut_item_size = 0;
+
+ 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 */
+ }
+ if (!p)
+ { /* must create a new one */
+ int i;
+ for (i = 0; i < b->no_cat; i++)
+ if (new_size <= b->file[i].head.block_max)
+ break;
+ if (i == b->no_cat)
+ i = b->no_cat - 1;
+ p = new_leaf (b, i);
+ }
+ if (new_size > b->file[p->cat].head.block_max)
+ {
+ char *first_dst;
+ char *cut_item = cut_item_buf;
+
+ assert (half1);
+ assert (half2);
+
+ /* first half */
+ p->size = half1 - dst_buf;
+ memcpy (p->bytes, dst_buf, half1 - dst_buf);
+
+ /* second half */
+ *sp2 = new_leaf (b, p->cat);
+
+ (*b->method->code_reset)(c2);
+
+ first_dst = (*sp2)->bytes;
+
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &first_dst, &cut_item);
+
+ memcpy (first_dst, half2, dst - half2);
+
+ (*sp2)->size = (first_dst - (*sp2)->bytes) + (dst - half2);
+ (*sp2)->dirty = 1;
+ p->dirty = 1;
+ memcpy (sub_item, cut_item_buf, cut_item_size);
+ *sub_size = cut_item_size;