#include <yaz/xmalloc.h>
+#include <yaz/log.h>
#include <isamb.h>
+#include <assert.h>
+
+struct ISAMB_head {
+ int first_block;
+ int last_block;
+ int block_size;
+};
+
+#define ISAMB_DATA_OFFSET 3
struct ISAMB_s {
BFiles bfs;
+ BFile bf;
ISAMC_M method;
+ int head_dirty;
+
+ struct ISAMB_head head;
+};
+
+struct ISAMB_block {
+ int pos;
+ int size;
+ int leaf;
+ int dirty;
+ int offset;
+ unsigned char *bytes;
+ void *decodeClientData;
+};
+
+struct ISAMB_PP_s {
+ ISAMB isamb;
+ int level;
+ struct ISAMB_block **block;
};
-typedef unsigned char *Bpage;
+void encode_ptr (char **dst, int pos)
+{
+ memcpy (*dst, &pos, sizeof(pos));
+ (*dst) += sizeof(pos);
+}
-ISAMB isamb_open (BFiles bfs, const char *name, ISAMC_M method)
+void decode_ptr (char **src, int *pos)
+{
+ memcpy (pos, *src, sizeof(*pos));
+ (*src) += sizeof(*pos);
+}
+
+ISAMB isamb_open (BFiles bfs, const char *name, int writeflag, ISAMC_M method)
{
ISAMB isamb = xmalloc (sizeof(*isamb));
isamb->bfs = bfs;
isamb->method = (ISAMC_M) xmalloc (sizeof(*method));
memcpy (isamb->method, method, sizeof(*method));
+
+ isamb->head.first_block = 1;
+ isamb->head.last_block = 1;
+ isamb->head.block_size = 1024;
+ isamb->head_dirty = 0;
+
+ isamb->bf = bf_open (bfs, name, isamb->head.block_size, writeflag);
+
+ bf_read (isamb->bf, 0, 0, sizeof(struct ISAMB_head),
+ &isamb->head);
return isamb;
}
void isamb_close (ISAMB isamb)
{
+ if (isamb->head_dirty)
+ bf_write (isamb->bf, 0, 0, sizeof(struct ISAMB_head), &isamb->head);
xfree (isamb->method);
xfree (isamb);
}
-#if 0
-/* read page at pos */
-void isamb_get_block (ISAMB is, ISAMB_pos pos, Bpage *page)
+struct ISAMB_block *open_block (ISAMB b, ISAMC_P pos)
{
+ struct ISAMB_block *p;
+ if (!pos)
+ return 0;
+ p = xmalloc (sizeof(*p));
+ p->pos = pos;
+ p->bytes = xmalloc (b->head.block_size);
+ bf_read (b->bf, pos, 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;
}
-/* alloc page */
-ISAMB_pos isamb_alloc_block (ISAMB is, int block_size, Bpage *page)
+struct ISAMB_block *new_block (ISAMB b, int leaf)
{
+ struct ISAMB_block *p;
+
+ p = xmalloc (sizeof(*p));
+ p->pos = b->head.last_block++;
+ b->head_dirty = 1;
+ p->bytes = xmalloc (b->head.block_size);
+ memset (p->bytes, 0, b->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;
}
-#define isamb_page_set_leaf (p) 0[p] = 1
-#define isamb_page_set_noleaf (p) 0[p] = 0
-#define isamb_page_datalist (4+p)
-
-static void isamb_page_set_no(Bpage page, int no)
+void close_block (ISAMB b, struct ISAMB_block *p)
{
- page[1] = no & 255;
- page[2] = (no >> 8) & 255;
- page[3] = (no >> 16) & 255;
+ 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->bf, p->pos, 0, 0, p->bytes);
+ }
+ (*b->method->code_stop)(ISAMC_DECODE, p->decodeClientData);
+ xfree (p->bytes);
+ xfree (p);
}
-static int isamb_page_get_no(Bpage page)
+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)
{
- return page[1] + 256*page[2] + 65536*page[3];
+ char dst_buf[2048];
+ 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[256];
+ int cut_item_size = 0;
+
+ while (src != endp)
+ {
+ char file_item_buf[256];
+ 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->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);
+
+ (*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->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 isamb_insert_sub(ISAMB is, ISAMB_pos *pos, const void *data)
+void insert_int (ISAMB b, struct ISAMB_block *p, const void *new_item,
+ struct ISAMB_block **sp,
+ void *split_item, int *split_size)
{
- const char *src;
- char dst[200];
- int no, i;
-
- isamb_get_block (is, *pos, &page);
- if (!isamb_page_isleaf (page))
+ 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[256];
+ 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)
{
- ISAMB_pos subptr;
- src = isamb_page_datalist (page);
- no = isamb_page_get_no (page);
- decodeClientData = (*is->method->code_start)(ISAMC_DECODE);
-
- isamb_read_subptr (&subptr, &src);
- for (i = 0; i<no; i++)
- {
- const char *src0 = src;
-
- (*is->method->code_item)(ISAMC_DECODE, decodeClientData,
- dst, &src);
- if ((*is->method->compare_item)(data, dst) < 0)
- break;
-
- isamb_read_subptr (&subptr, src);
- }
- isamb_insert_sub (is, subptr, data);
- *pos = subptr;
- (*is->method->code_stop)(ISAMC_DECODE, decodeClientData);
+ 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[2048];
+ 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->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->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);
+ (*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 isamb_insert_one (ISAMB b, const void *item, ISAMC_P pos)
+{
+ struct ISAMB_block *p, *sp = 0;
+ char sub_item[256];
+ int sub_size;
+
+ if (!pos)
+ p = new_block (b, 1);
else
+ p = open_block (b, pos);
+ if (!p)
+ return -1;
+
+ 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);
+ 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[256];
+ char *item_ptr = item_buf;
+ while ((*data->read_item)(data->clientData, &item_ptr, &i_mode))
{
- src = isamb_page_datalist (page);
- no = isamb_page_get_no (page);
- decodeClientData = (*is->method->code_start)(ISAMC_DECODE);
- diff = -1;
- for (i = 0; i<no; i++)
- {
- int diff;
- (*is->method->code_item)(ISAMC_DECODE, decodeClientData,
- dst, &src);
- diff = (*is->method->compare_item)(data, dst);
- if (diff <= 0)
- break;
- }
- if (diff < 0)
- {
- int j;
- src = isamb_page_datalist (page);
- page2 = isamb_page_dup (is, page);
- dst2 = isamb_page_datalist (page2);
- src2 = data;
- for (j = 0; j <= no; j++)
- {
- if ( i == j)
- (*is->method->code_item)(ISAMC_ENCODE, encodeClientData,
- &dst2, &src2);
- if (j < no)
- {
- char *dst0 = dst;
- (*is->method->code_item)(ISAMC_DECODE, decodeClientData,
- &dst, &src);
- (*is->method->code_item)(ISAMC_ENCODE, encodeClientData,
- &dst2, &dst0);
- }
- }
- }
+ item_ptr = item_buf;
+ pos = isamb_insert_one (b, item_buf, pos);
}
+ return pos;
}
-/* insert data(input) in table is(input) at pos(input/output) */
-int isamb_insert (ISAMB is, ISAMB_pos *pos, const void *data)
+
+ISAMB_PP isamb_pp_open (ISAMB isamb, ISAMB_P pos)
{
- void *decodeClientData;
+ ISAMB_PP pp = xmalloc (sizeof(*pp));
- Bpage page;
- if (*pos == 0)
+ pp->isamb = isamb;
+ pp->block = xmalloc (10 * sizeof(*pp->block));
+
+ pp->level = 0;
+ while (1)
{
- *pos = isamb_alloc_block (is, 1024, &page);
- isamb_page_set_leaf (page);
- isamb_page_set_no (page, 0);
+ struct ISAMB_block *p = open_block (isamb, pos);
+ char *src = p->bytes + p->offset;
+ pp->block[pp->level] = p;
+
+ if (p->bytes[0]) /* leaf */
+ break;
+
+ decode_ptr (&src, &pos);
+ p->offset = src - (char*) p->bytes;
+ pp->level++;
}
- else /* find leaf ... */
+ pp->block[pp->level+1] = 0;
+ return pp;
+}
+
+void isamb_pp_close (ISAMB_PP pp)
+{
+ int i;
+ if (!pp)
+ return;
+ for (i = 0; i <= pp->level; i++)
+ close_block (pp->isamb, pp->block[i]);
+ xfree (pp->block);
+ xfree (pp);
+}
+
+int isamb_pp_read (ISAMB_PP pp, void *buf)
+{
+ char *dst = buf;
+ char *src;
+ struct ISAMB_block *p = pp->block[pp->level];
+ if (!p)
+ return 0;
+
+ while (p->offset == p->size)
{
- isamb_insert_sub (is, pos, const void *data);
+ int pos, item_len;
+ while (p->offset == p->size)
+ {
+ if (pp->level == 0)
+ return 0;
+ close_block (pp->isamb, pp->block[pp->level]);
+ pp->block[pp->level] = 0;
+ (pp->level)--;
+ p = pp->block[pp->level];
+ assert (p->bytes[0] == 0); /* must be int */
+ }
+ src = p->bytes + p->offset;
+
+ decode_ptr (&src, &item_len);
+ src += item_len;
+ decode_ptr (&src, &pos);
+
+ p->offset = src - (char*) p->bytes;
+ ++(pp->level);
+
+ while (1)
+ {
+ pp->block[pp->level] = p = open_block (pp->isamb, pos);
+
+ if (p->bytes[0]) /* leaf */
+ {
+ break;
+ }
+ src = p->bytes + p->offset;
+ decode_ptr (&src, &pos);
+ p->offset = src - (char*) p->bytes;
+ pp->level++;
+ }
}
+ assert (p->offset < p->size);
+ assert (p->bytes[0]);
+ src = p->bytes + p->offset;
+ (*pp->isamb->method->code_item)(ISAMC_DECODE, p->decodeClientData,
+ &dst, &src);
+ p->offset = src - (char*) p->bytes;
+ return 1;
+}
+
+int isamb_pp_num (ISAMB_PP pp)
+{
+ return 1;
}
-#endif
projects / idzebra-moved-to-github.git / blobdiff