+ int i;
+ for (i = 0; i<isamb->no_cat; i++)
+ {
+ if (isamb->file[i].head_dirty)
+ bf_write (isamb->file[i].bf, 0, 0,
+ sizeof(struct ISAMB_head), &isamb->file[i].head);
+ }
+ xfree (isamb->file);
+ xfree (isamb->method);
+ xfree (isamb);
+}
+
+struct ISAMB_block *open_block (ISAMB b, ISAMC_P pos)
+{
+ int cat = pos&3;
+ struct ISAMB_block *p;
+ if (!pos)
+ return 0;
+ p = xmalloc (sizeof(*p));
+ p->pos = pos;
+ p->cat = pos & 3;
+ p->bytes = xmalloc (b->file[cat].head.block_size);
+ bf_read (b->file[cat].bf, pos/4, 0, 0, p->bytes);
+ p->leaf = p->bytes[0];
+ p->size = p->bytes[1] + 256 * p->bytes[2];
+ p->offset = ISAMB_DATA_OFFSET;
+ p->dirty = 0;
+ p->decodeClientData = (*b->method->code_start)(ISAMC_DECODE);
+ return p;
+}
+
+struct ISAMB_block *new_block (ISAMB b, int leaf, int cat)
+{
+ struct ISAMB_block *p;
+ int block_no;
+
+ p = xmalloc (sizeof(*p));
+ block_no = b->file[cat].head.last_block++;
+ p->cat = cat;
+ p->pos = block_no * 4 + cat;
+ p->cat = cat;
+ b->file[cat].head_dirty = 1;
+ p->bytes = xmalloc (b->file[cat].head.block_size);
+ memset (p->bytes, 0, b->file[cat].head.block_size);
+ p->leaf = leaf;
+ p->size = ISAMB_DATA_OFFSET;
+ p->dirty = 1;
+ p->offset = ISAMB_DATA_OFFSET;
+ p->decodeClientData = (*b->method->code_start)(ISAMC_DECODE);
+ return p;
+}
+
+void close_block (ISAMB b, struct ISAMB_block *p)
+{
+ if (!p)
+ return;
+ if (p->dirty)
+ {
+ p->bytes[0] = p->leaf;
+ p->bytes[1] = p->size & 255;
+ p->bytes[2] = p->size >> 8;
+ bf_write (b->file[p->cat].bf, p->pos/4, 0, 0, p->bytes);
+ }
+ (*b->method->code_stop)(ISAMC_DECODE, p->decodeClientData);
+ xfree (p->bytes);
+ xfree (p);
+}
+
+void insert_sub (ISAMB b, struct ISAMB_block *p, const void *new_item,
+ struct ISAMB_block **sp,
+ void *sub_item, int *sub_size);
+
+void insert_leaf (ISAMB b, struct ISAMB_block *p, const void *new_item,
+ struct ISAMB_block **sp,
+ void *sub_item, int *sub_size)
+{
+ char dst_buf[DST_BUF_SIZE];
+ char *dst = dst_buf;
+ char *src = p->bytes + ISAMB_DATA_OFFSET;
+ char *endp = p->bytes + p->size;
+ void *c1 = (*b->method->code_start)(ISAMC_DECODE);
+ void *c2 = (*b->method->code_start)(ISAMC_ENCODE);
+ char *half1 = 0;
+ char *half2 = 0;
+ char *cut = dst_buf + p->size / 2;
+ char cut_item_buf[DST_ITEM_MAX];
+ int cut_item_size = 0;
+
+ while (src != endp)
+ {
+ char file_item_buf[DST_ITEM_MAX];
+ char *file_item = file_item_buf;
+
+ (*b->method->code_item)(ISAMC_DECODE, c1, &file_item, &src);
+ if (new_item)
+ {
+ int d = (*b->method->compare_item)(file_item_buf, new_item);
+ if (d > 0)
+ {
+ char *item_ptr = (char*) new_item;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &item_ptr);
+ new_item = 0;
+ p->dirty = 1;
+ }
+ else if (d == 0)
+ {
+ new_item = 0;
+ }
+ }
+
+ if (!half1 && dst > cut)
+ {
+ half1 = dst; /* candidate for splitting */
+
+ file_item = file_item_buf;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &file_item);
+
+ cut_item_size = file_item - file_item_buf;
+ memcpy (cut_item_buf, file_item_buf, cut_item_size);
+
+ half2 = dst;
+ }
+ else
+ {
+ file_item = file_item_buf;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &file_item);
+ }
+ }
+ if (new_item)
+ {
+ char *item_ptr = (char*) new_item;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &item_ptr);
+ new_item = 0;
+ p->dirty = 1;
+ }
+ p->size = dst - dst_buf + ISAMB_DATA_OFFSET;
+ if (p->size > b->file[p->cat].head.block_size)
+ {
+ char *first_dst;
+ char *cut_item = cut_item_buf;
+
+ /* first half */
+ p->size = half1 - dst_buf + ISAMB_DATA_OFFSET;
+ memcpy (p->bytes+ISAMB_DATA_OFFSET, dst_buf, half1 - dst_buf);
+
+ /* second half */
+ *sp = new_block (b, 1, p->cat);
+
+ (*b->method->code_reset)(c2);
+
+ first_dst = (*sp)->bytes + ISAMB_DATA_OFFSET;
+
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &first_dst, &cut_item);
+
+ memcpy (first_dst, half2, dst - half2);
+
+ (*sp)->size = (first_dst - (char*) (*sp)->bytes) + (dst - half2);
+ (*sp)->dirty = 1;
+ p->dirty = 1;
+ memcpy (sub_item, cut_item_buf, cut_item_size);
+ *sub_size = cut_item_size;
+
+ yaz_log (LOG_LOG, "l split %d / %d", p->size, (*sp)->size);
+
+ }
+ else
+ {
+ assert (p->size > ISAMB_DATA_OFFSET);
+ assert (p->size <= b->file[p->cat].head.block_size);
+ memcpy (p->bytes+ISAMB_DATA_OFFSET, dst_buf, dst - dst_buf);
+ *sp = 0;
+ }
+ (*b->method->code_stop)(ISAMC_DECODE, c1);
+ (*b->method->code_stop)(ISAMC_ENCODE, c2);
+}
+
+void insert_int (ISAMB b, struct ISAMB_block *p, const void *new_item,
+ struct ISAMB_block **sp,
+ void *split_item, int *split_size)
+{
+ char *startp = p->bytes + ISAMB_DATA_OFFSET;
+ char *src = startp;
+ char *endp = p->bytes + p->size;
+ int pos;
+ struct ISAMB_block *sub_p1 = 0, *sub_p2 = 0;
+ char sub_item[DST_ITEM_MAX];
+ int sub_size;
+
+ *sp = 0;
+
+ decode_ptr (&src, &pos);
+ while (src != endp)
+ {
+ int item_len;
+ int d;
+ decode_ptr (&src, &item_len);
+ d = (*b->method->compare_item)(src, new_item);
+ if (d > 0)
+ {
+ sub_p1 = open_block (b, pos);
+ assert (sub_p1);
+ insert_sub (b, sub_p1, new_item, &sub_p2,
+ sub_item, &sub_size);
+ break;
+ }
+ src += item_len;
+ decode_ptr (&src, &pos);
+ }
+ if (!sub_p1)
+ {
+ sub_p1 = open_block (b, pos);
+ assert (sub_p1);
+ insert_sub (b, sub_p1, new_item, &sub_p2,
+ sub_item, &sub_size);
+ }
+ if (sub_p2)
+ {
+ char dst_buf[DST_BUF_SIZE];
+ char *dst = dst_buf;
+
+ assert (sub_size < 20);
+
+ 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 + ISAMB_DATA_OFFSET;
+ if (p->size <= b->file[p->cat].head.block_size)
+ {
+ 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 + ISAMB_DATA_OFFSET, dst_buf, p_new_size);
+ p_new_size += ISAMB_DATA_OFFSET;
+
+ decode_ptr (&src, split_size);
+ memcpy (split_item, src, *split_size);
+ src += *split_size;
+
+ *sp = new_block (b, 0, p->cat);
+ (*sp)->size = endp - src;
+ memcpy ((*sp)->bytes+ISAMB_DATA_OFFSET, src, (*sp)->size);
+ (*sp)->size += ISAMB_DATA_OFFSET;
+
+ yaz_log (LOG_LOG, "i split %d -> %d %d",
+ p->size, p_new_size, (*sp)->size);
+ p->size = p_new_size;
+ }
+ p->dirty = 1;
+ close_block (b, sub_p2);
+ }
+ close_block (b, sub_p1);
+}
+
+void insert_sub (ISAMB b, struct ISAMB_block *p, const void *new_item,
+ struct ISAMB_block **sp,
+ void *sub_item, int *sub_size)
+{
+ if (p->leaf)
+ insert_leaf (b, p, new_item, sp, sub_item, sub_size);
+ else
+ insert_int (b, p, new_item, sp, sub_item, sub_size);
+}
+
+int insert_flat (ISAMB b, const void *new_item, ISAMC_P *posp)
+{
+ struct ISAMB_block *p = 0;
+ char *src = 0, *endp = 0;
+ char dst_buf[DST_BUF_SIZE], *dst = dst_buf;
+ int new_size;
+ ISAMB_P pos = *posp;
+ void *c1 = (*b->method->code_start)(ISAMC_DECODE);
+ void *c2 = (*b->method->code_start)(ISAMC_ENCODE);
+
+ if (pos)
+ {
+ p = open_block (b, pos);
+ if (!p)
+ return -1;
+ src = p->bytes + ISAMB_DATA_OFFSET;
+ endp = p->bytes + p->size;
+
+ }
+ while (p && src != endp)
+ {
+ char file_item_buf[DST_ITEM_MAX];
+ char *file_item = file_item_buf;
+
+ (*b->method->code_item)(ISAMC_DECODE, c1, &file_item, &src);
+ if (new_item)
+ {
+ int d = (*b->method->compare_item)(file_item_buf, new_item);
+ if (d > 0)
+ {
+ char *item_ptr = (char*) new_item;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &item_ptr);
+ new_item = 0;
+ p->dirty = 1;
+ }
+ else if (d == 0)
+ {
+ new_item = 0;
+ }
+ }
+ file_item = file_item_buf;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &file_item);
+ }
+ if (new_item)
+ {
+ char *item_ptr = (char*) new_item;
+ (*b->method->code_item)(ISAMC_ENCODE, c2, &dst, &item_ptr);
+ new_item = 0;
+ if (p)
+ p->dirty = 1;
+ }
+ new_size = dst - dst_buf + ISAMB_DATA_OFFSET;
+ if (p && new_size > b->file[p->cat].head.block_size)
+ {
+ 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_size)
+ break;
+ p = new_block (b, 1, i);
+ }
+ memcpy (p->bytes+ISAMB_DATA_OFFSET, dst_buf, dst - dst_buf);
+ p->size = new_size;
+ *posp = p->pos;
+ (*b->method->code_stop)(ISAMC_DECODE, c1);
+ (*b->method->code_stop)(ISAMC_ENCODE, c2);
+ close_block (b, p);
+ return 0;
+}
+
+int isamb_insert_one (ISAMB b, const void *item, ISAMC_P pos)
+{
+
+ if ((pos & 3) != b->no_cat-1)
+ {
+ /* note if pos == 0 we go here too! */
+ /* flat insert */
+ insert_flat (b, item, &pos);
+ }
+ else
+ {
+ /* b-tree insert */
+ struct ISAMB_block *p = open_block (b, pos), *sp = 0;
+ char sub_item[DST_ITEM_MAX];
+ int sub_size;
+
+
+ insert_sub (b, p, item, &sp, sub_item, &sub_size);
+ if (sp)
+ { /* increase level of tree by one */
+ struct ISAMB_block *p2 = new_block (b, 0, p->cat);
+ char *dst = p2->bytes + p2->size;
+
+ encode_ptr (&dst, p->pos);
+ assert (sub_size < 20);
+ encode_ptr (&dst, sub_size);
+ memcpy (dst, sub_item, sub_size);
+ dst += sub_size;
+ encode_ptr (&dst, sp->pos);
+
+ p2->size = dst - (char*) p2->bytes;
+ pos = p2->pos; /* return new super page */
+ close_block (b, sp);
+ close_block (b, p2);
+ }
+ else
+ pos = p->pos; /* return current one (again) */
+ close_block (b, p);
+ }
+ return pos;
+}
+
+ISAMB_P isamb_merge (ISAMB b, ISAMB_P pos, ISAMC_I data)
+{
+ int i_mode;
+ char item_buf[DST_ITEM_MAX];
+ char *item_ptr = item_buf;
+ while ((*data->read_item)(data->clientData, &item_ptr, &i_mode))
+ {
+ item_ptr = item_buf;
+ pos = isamb_insert_one (b, item_buf, pos);
+ }
+ return pos;
+}
+
+ISAMB_PP isamb_pp_open (ISAMB isamb, ISAMB_P pos)
+{
+ ISAMB_PP pp = xmalloc (sizeof(*pp));
+
+ pp->isamb = isamb;
+ pp->block = xmalloc (10 * sizeof(*pp->block));
+
+ pp->level = 0;
+ while (1)
+ {
+ struct ISAMB_block *p = open_block (isamb, pos);
+ char *src = p->bytes + p->offset;
+ pp->block[pp->level] = p;