-
+/*
+ * Copyright (c) 1995-1998, Index Data.
+ * See the file LICENSE for details.
+ *
+ * $Id: isamb.c,v 1.4 2002-04-17 08:17:13 adam Exp $
+ */
#include <yaz/xmalloc.h>
#include <yaz/log.h>
#include <isamb.h>
#define ISAMB_DATA_OFFSET 3
+#define DST_BUF_SIZE 4500
+#define DST_ITEM_MAX 256
+
+struct ISAMB_file {
+ BFile bf;
+ int head_dirty;
+ struct ISAMB_head head;
+};
+
struct ISAMB_s {
BFiles bfs;
- BFile bf;
ISAMC_M method;
- int head_dirty;
- struct ISAMB_head head;
+ struct ISAMB_file *file;
+ int no_cat;
};
struct ISAMB_block {
int pos;
+ int cat;
int size;
int leaf;
int dirty;
ISAMB isamb_open (BFiles bfs, const char *name, int writeflag, ISAMC_M method)
{
ISAMB isamb = xmalloc (sizeof(*isamb));
+ int i, b_size = 64;
isamb->bfs = bfs;
isamb->method = (ISAMC_M) xmalloc (sizeof(*method));
memcpy (isamb->method, method, sizeof(*method));
+ isamb->no_cat = 4;
- 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);
+ isamb->file = xmalloc (sizeof(*isamb->file) * isamb->no_cat);
+ for (i = 0; i<isamb->no_cat; i++)
+ {
+ char fname[DST_BUF_SIZE];
+ isamb->file[i].head.first_block = 1;
+ isamb->file[i].head.last_block = 1;
+ isamb->file[i].head.block_size = b_size;
+ b_size = b_size * 4;
+ isamb->file[i].head_dirty = 0;
+ sprintf (fname, "%s-%d", name, i);
+ isamb->file[i].bf =
+ bf_open (bfs, fname, isamb->file[i].head.block_size, writeflag);
- bf_read (isamb->bf, 0, 0, sizeof(struct ISAMB_head),
- &isamb->head);
+ bf_read (isamb->file[i].bf, 0, 0, sizeof(struct ISAMB_head),
+ &isamb->file[i].head);
+ }
return isamb;
}
void isamb_close (ISAMB isamb)
{
- if (isamb->head_dirty)
- bf_write (isamb->bf, 0, 0, sizeof(struct ISAMB_head), &isamb->head);
+ 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->bytes = xmalloc (b->head.block_size);
- bf_read (b->bf, pos, 0, 0, p->bytes);
+ 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;
return p;
}
-struct ISAMB_block *new_block (ISAMB b, int leaf)
+struct ISAMB_block *new_block (ISAMB b, int leaf, int cat)
{
struct ISAMB_block *p;
+ int block_no;
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);
+ 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->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);
+ 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);
struct ISAMB_block **sp,
void *sub_item, int *sub_size)
{
- char dst_buf[2048];
+ char dst_buf[DST_BUF_SIZE];
char *dst = dst_buf;
char *src = p->bytes + ISAMB_DATA_OFFSET;
char *endp = p->bytes + p->size;
char *half1 = 0;
char *half2 = 0;
char *cut = dst_buf + p->size / 2;
- char cut_item_buf[256];
+ char cut_item_buf[DST_ITEM_MAX];
int cut_item_size = 0;
while (src != endp)
{
- char file_item_buf[256];
+ char file_item_buf[DST_ITEM_MAX];
char *file_item = file_item_buf;
(*b->method->code_item)(ISAMC_DECODE, c1, &file_item, &src);
p->dirty = 1;
}
p->size = dst - dst_buf + ISAMB_DATA_OFFSET;
- if (p->size > b->head.block_size)
+ if (p->size > b->file[p->cat].head.block_size)
{
char *first_dst;
char *cut_item = cut_item_buf;
memcpy (p->bytes+ISAMB_DATA_OFFSET, dst_buf, half1 - dst_buf);
/* second half */
- *sp = new_block (b, 1);
+ *sp = new_block (b, 1, p->cat);
(*b->method->code_reset)(c2);
else
{
assert (p->size > ISAMB_DATA_OFFSET);
- assert (p->size <= b->head.block_size);
+ assert (p->size <= b->file[p->cat].head.block_size);
memcpy (p->bytes+ISAMB_DATA_OFFSET, dst_buf, dst - dst_buf);
*sp = 0;
}
char *endp = p->bytes + p->size;
int pos;
struct ISAMB_block *sub_p1 = 0, *sub_p2 = 0;
- char sub_item[256];
+ char sub_item[DST_ITEM_MAX];
int sub_size;
*sp = 0;
}
if (sub_p2)
{
- char dst_buf[2048];
+ char dst_buf[DST_BUF_SIZE];
char *dst = dst_buf;
assert (sub_size < 20);
dst += endp - src;
}
p->size = dst - dst_buf + ISAMB_DATA_OFFSET;
- if (p->size <= b->head.block_size)
+ if (p->size <= b->file[p->cat].head.block_size)
{
memcpy (startp, dst_buf, dst - dst_buf);
}
src = dst_buf;
endp = dst;
- half = src + b->head.block_size/2;
+ half = src + b->file[p->cat].head.block_size/2;
decode_ptr (&src, &pos);
while (src <= half)
{
memcpy (split_item, src, *split_size);
src += *split_size;
- *sp = new_block (b, 0);
+ *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;
insert_int (b, p, new_item, sp, sub_item, sub_size);
}
-int isamb_insert_one (ISAMB b, const void *item, ISAMC_P pos)
+int insert_flat (ISAMB b, const void *new_item, ISAMC_P *posp)
{
- struct ISAMB_block *p, *sp = 0;
- char sub_item[256];
- int sub_size;
-
- if (!pos)
- p = new_block (b, 1);
- else
+ 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 > p->size)
+ {
+ yaz_log (LOG_LOG, "resize %d -> %d", p->size, new_size);
+ close_block (b, p);
+ /* delete it too!! */
+ p = 0; /* make a new one anyway */
+ }
if (!p)
- return -1;
+ { /* 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;
+}
- 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);
+int isamb_insert_one (ISAMB b, const void *item, ISAMC_P pos)
+{
- p2->size = dst - (char*) p2->bytes;
- pos = p2->pos; /* return new super page */
- close_block (b, sp);
- close_block (b, p2);
+ if ((pos & 3) != b->no_cat-1)
+ {
+ /* note if pos == 0 we go here too! */
+ /* flat insert */
+ insert_flat (b, item, &pos);
}
else
- pos = p->pos; /* return current one (again) */
- close_block (b, p);
+ {
+ /* b-tree insert */
+ struct ISAMB_block *p, *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[256];
+ char item_buf[DST_ITEM_MAX];
char *item_ptr = item_buf;
while ((*data->read_item)(data->clientData, &item_ptr, &i_mode))
{
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