-/*
- * Copyright (c) 1996-1998, Index Data.
- * See the file LICENSE for details.
- * Sebastian Hammer, Adam Dickmeiss, Heikki Levanto
- *
- */
+/* $Id: merge.c,v 1.30 2005-04-13 13:03:48 adam Exp $
+ Copyright (C) 1995-2005
+ Index Data ApS
+
+This file is part of the Zebra server.
+
+Zebra is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Zebra; see the file LICENSE.zebra. If not, write to the
+Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.
+*/
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <stdio.h>
-
-#include <log.h>
+#include <yaz/log.h>
#include "isamc-p.h"
-#include "isamh-p.h"
-struct isc_merge_block {
- int offset; /* offset in r_buf */
- int block; /* block number of file (0 if none) */
- int dirty; /* block is different from that on file */
+struct isamc_merge_block {
+ int offset; /* offset in r_buf */
+ zint block; /* block number of file (0 if none) */
+ int dirty; /* block is different from that on file */
};
-static void opt_blocks (ISAMC is, struct isc_merge_block *mb, int ptr,
+#if 0
+static void opt_blocks (ISAMC is, struct isamc_merge_block *mb, int ptr,
int last)
{
int i, no_dirty = 0;
if (!last)
mb[i].dirty = 1;
}
+#endif
-static void flush_blocks (ISAMC is, struct isc_merge_block *mb, int ptr,
- char *r_buf, int *firstpos, int cat, int last,
- int *numkeys)
+static void flush_blocks (ISAMC is, struct isamc_merge_block *mb, int ptr,
+ char *r_buf, zint *firstpos, int cat, int last,
+ zint *numkeys)
{
int i;
/* consider this block number */
if (!mb[i].block)
{
- mb[i].block = isc_alloc_block (is, cat);
+ mb[i].block = isamc_alloc_block (is, cat);
mb[i].dirty = 1;
}
mb[i+1].block = 0;
else if (!mb[i+1].block)
{
- mb[i+1].block = isc_alloc_block (is, cat);
+ mb[i+1].block = isamc_alloc_block (is, cat);
mb[i+1].dirty = 1;
mb[i].dirty = 1;
}
if (!*firstpos)
*firstpos = mb[i].block;
if (is->method->debug > 2)
- logf (LOG_LOG, "isc: skip ptr=%d size=%d %d %d",
+ yaz_log (YLOG_LOG, "isc: skip ptr=%d size=%d %d " ZINT_FORMAT,
i, ssize, cat, mb[i].block);
++(is->files[cat].no_skip_writes);
continue;
src = r_buf + mb[i].offset - ISAMC_BLOCK_OFFSET_1;
ssize += ISAMC_BLOCK_OFFSET_1;
- memcpy (src+sizeof(int)+sizeof(ssize), numkeys,
- sizeof(*numkeys));
+ memcpy (src+sizeof(zint)+sizeof(ssize), numkeys, sizeof(*numkeys));
if (is->method->debug > 2)
- logf (LOG_LOG, "isc: flush ptr=%d numk=%d size=%d nextpos=%d",
- i, *numkeys, (int) ssize, mb[i+1].block);
+ yaz_log (YLOG_LOG, "isc: flush ptr=%d numk=" ZINT_FORMAT " size=%d nextpos="
+ ZINT_FORMAT, i, *numkeys, (int) ssize, mb[i+1].block);
}
else
{
src = r_buf + mb[i].offset - ISAMC_BLOCK_OFFSET_N;
ssize += ISAMC_BLOCK_OFFSET_N;
if (is->method->debug > 2)
- logf (LOG_LOG, "isc: flush ptr=%d size=%d nextpos=%d",
+ yaz_log (YLOG_LOG, "isc: flush ptr=%d size=%d nextpos=" ZINT_FORMAT,
i, (int) ssize, mb[i+1].block);
}
- memcpy (src, &mb[i+1].block, sizeof(int));
- memcpy (src+sizeof(int), &ssize, sizeof(ssize));
- isc_write_block (is, cat, mb[i].block, src);
+ memcpy (src, &mb[i+1].block, sizeof(zint));
+ memcpy (src+sizeof(zint), &ssize, sizeof(ssize));
+ isamc_write_block (is, cat, mb[i].block, src);
}
}
-static int get_border (ISAMC is, struct isc_merge_block *mb, int ptr,
- int cat, int firstpos)
+static int get_border (ISAMC is, struct isamc_merge_block *mb, zint ptr,
+ int cat, zint firstpos)
{
/* Border set to initial fill or block size depending on
whether we are creating a new one or updating and old one.
return mb[ptr].offset + fill - off;
}
-ISAMC_P isc_merge (ISAMC is, ISAMC_P ipos, ISAMC_I data)
+void isamc_merge (ISAMC is, ISAM_P *ipos, ISAMC_I *data)
{
char i_item[128], *i_item_ptr;
int last_dirty = 0;
int debug = is->method->debug;
- struct isc_merge_block mb[200];
+ struct isamc_merge_block mb[200];
- int firstpos = 0;
+ zint firstpos = 0;
int cat = 0;
char r_item_buf[128]; /* temporary result output */
char *r_buf; /* block with resulting data */
int r_offset = 0; /* current offset in r_buf */
int ptr = 0; /* pointer */
void *r_clientData; /* encode client data */
- int border;
- int numKeys = 0;
+ zint border;
+ zint numKeys = 0;
- r_clientData = (*is->method->code_start)(ISAMC_ENCODE);
+ r_clientData = (*is->method->codec.start)();
r_buf = is->merge_buf + 128;
- pp = isc_pp_open (is, ipos);
+ pp = isamc_pp_open (is, *ipos);
/* read first item from file. make sure f_more indicates no boundary */
f_item_ptr = f_item;
- f_more = isc_read_item (pp, &f_item_ptr);
+ f_more = isamc_read_item (pp, &f_item_ptr);
if (f_more > 0)
f_more = 1;
cat = pp->cat;
if (debug > 1)
- logf (LOG_LOG, "isc: isc_merge begin %d %d", cat, pp->pos);
+ yaz_log (YLOG_LOG, "isc: isamc_merge begin %d " ZINT_FORMAT, cat, pp->pos);
/* read first item from i */
i_item_ptr = i_item;
the original (if any)
*/
if (debug > 3)
- logf (LOG_LOG, "isc: release A");
+ yaz_log (YLOG_LOG, "isc: release A");
if (mb[ptr].block)
- isc_release_block (is, pp->cat, mb[ptr].block);
+ isamc_release_block (is, pp->cat, mb[ptr].block);
mb[ptr].block = pp->pos;
if (!mb[ptr].dirty)
mb[ptr].dirty = 1;
mb[ptr].dirty = last_dirty;
mb[ptr].offset = r_offset;
if (debug > 3)
- logf (LOG_LOG, "isc: bound ptr=%d,offset=%d",
+ yaz_log (YLOG_LOG, "isc: bound ptr=%d,offset=%d",
ptr, r_offset);
if (cat==is->max_cat && ptr >= is->method->max_blocks_mem)
{
except 1 will be flushed.
*/
if (debug > 2)
- logf (LOG_LOG, "isc: flush A %d sections", ptr);
+ yaz_log (YLOG_LOG, "isc: flush A %d sections", ptr);
flush_blocks (is, mb, ptr-1, r_buf, &firstpos, cat,
0, &pp->numKeys);
mb[0].block = mb[ptr-1].block;
}
/* move f */
f_item_ptr = f_item;
- f_more = isc_read_item (pp, &f_item_ptr);
+ f_more = isamc_read_item (pp, &f_item_ptr);
}
else if (cmp > 0) /* insert f */
{
memcpy (r_item, f_item, f_item_ptr - f_item);
/* move f */
f_item_ptr = f_item;
- f_more = isc_read_item (pp, &f_item_ptr);
+ f_more = isamc_read_item (pp, &f_item_ptr);
}
else /* insert i */
{
if (!i_mode) /* delete item which isn't there? */
{
- logf (LOG_FATAL, "Inconsistent register at offset %d",
+ yaz_log (YLOG_FATAL, "Inconsistent register at offset %d",
r_offset);
abort ();
}
if (r_item) /* insert resulting item? */
{
char *r_out_ptr = r_buf + r_offset;
+ const char *src = r_item;
int new_offset;
- (*is->method->code_item)(ISAMC_ENCODE, r_clientData,
- &r_out_ptr, &r_item);
+ (*is->method->codec.encode)(r_clientData, &r_out_ptr, &src);
new_offset = r_out_ptr - r_buf;
numKeys++;
if (border < new_offset && border >= r_offset)
{
if (debug > 2)
- logf (LOG_LOG, "isc: border %d %d", ptr, border);
+ yaz_log (YLOG_LOG, "isc: border %d " ZINT_FORMAT,
+ ptr, border);
/* Max size of current block category reached ...
make new virtual block entry */
mb[++ptr].block = 0;
surely not the last one(s).
*/
if (debug > 2)
- logf (LOG_LOG, "isc: flush B %d sections", ptr-1);
+ yaz_log (YLOG_LOG, "isc: flush B %d sections", ptr-1);
flush_blocks (is, mb, ptr-1, r_buf, &firstpos, cat,
0, &pp->numKeys);
mb[0].block = mb[ptr-1].block;
/* delete all original block(s) read so far */
for (i = 0; i < ptr; i++)
if (mb[i].block)
- isc_release_block (is, pp->cat, mb[i].block);
+ isamc_release_block (is, pp->cat, mb[i].block);
/* also delete all block to be read in the future */
pp->deleteFlag = 1;
int border = is->method->filecat[cat].ifill -
ISAMC_BLOCK_OFFSET_1 + mb[j].offset;
if (debug > 3)
- logf (LOG_LOG, "isc: remap %d border=%d", i, border);
+ yaz_log (YLOG_LOG, "isc: remap %d border=%d", i, border);
if (mb[i+1].offset > border && mb[i].offset <= border)
{
if (debug > 3)
- logf (LOG_LOG, "isc: to %d %d", j, mb[i].offset);
+ yaz_log (YLOG_LOG, "isc: to %d %d", j, mb[i].offset);
mb[++j].dirty = 1;
mb[j].block = 0;
mb[j].offset = mb[i].offset;
}
}
if (debug > 2)
- logf (LOG_LOG, "isc: remap from %d to %d sections to cat %d",
+ yaz_log (YLOG_LOG, "isc: remap from %d to %d sections to cat %d",
ptr, j, cat);
ptr = j;
border = get_border (is, mb, ptr, cat, firstpos);
if (debug > 3)
- logf (LOG_LOG, "isc: border=%d r_offset=%d", border, r_offset);
+ yaz_log (YLOG_LOG, "isc: border=" ZINT_FORMAT " r_offset=%d",
+ border, r_offset);
}
}
if (mb[ptr].offset < r_offset)
if (cat == pp->cat && mb[ptr].block)
{
if (debug > 3)
- logf (LOG_LOG, "isc: release C");
- isc_release_block (is, pp->cat, mb[ptr].block);
+ yaz_log (YLOG_LOG, "isc: release C");
+ isamc_release_block (is, pp->cat, mb[ptr].block);
mb[ptr].block = 0;
if (ptr > 0)
mb[ptr-1].dirty = 1;
}
if (debug > 2)
- logf (LOG_LOG, "isc: flush C, %d sections", ptr);
+ yaz_log (YLOG_LOG, "isc: flush C, %d sections", ptr);
if (firstpos)
{
/* we have to patch initial block with num keys if that
has changed */
- if (numKeys != isc_pp_num (pp))
+ if (numKeys != isamc_pp_num (pp))
{
if (debug > 2)
- logf (LOG_LOG, "isc: patch num keys firstpos=%d num=%d",
+ yaz_log (YLOG_LOG, "isc: patch num keys firstpos=" ZINT_FORMAT " num=" ZINT_FORMAT,
firstpos, numKeys);
bf_write (is->files[cat].bf, firstpos, ISAMC_BLOCK_OFFSET_N,
sizeof(numKeys), &numKeys);
else if (ptr > 0)
{ /* we haven't flushed initial block yet and there surely are some
blocks to flush. Make first block dirty if numKeys differ */
- if (numKeys != isc_pp_num (pp))
+ if (numKeys != isamc_pp_num (pp))
mb[0].dirty = 1;
}
/* flush rest of block(s) in r_buf */
flush_blocks (is, mb, ptr, r_buf, &firstpos, cat, 1, &numKeys);
- (*is->method->code_stop)(ISAMC_ENCODE, r_clientData);
+ (*is->method->codec.stop)(r_clientData);
if (!firstpos)
cat = 0;
if (debug > 1)
- logf (LOG_LOG, "isc: isc_merge return %d %d", cat, firstpos);
- isc_pp_close (pp);
- return cat + firstpos * 8;
+ yaz_log (YLOG_LOG, "isc: isamc_merge return %d " ZINT_FORMAT, cat, firstpos);
+ isamc_pp_close (pp);
+ *ipos = cat + firstpos * 8;
}
-ISAMC_P isamh_append (ISAMH is, ISAMH_P ipos, ISAMH_I data)
-{
-
- char i_item[128], *i_item_ptr;
- int i_more, i_mode, i;
-
- ISAMH_PP pp;
- char f_item[128], *f_item_ptr;
- int f_more;
- int last_dirty = 0;
- int debug = is->method->debug;
-
- struct isc_merge_block mb[200];
-
- int firstpos = 0;
- int cat = 0;
- char r_item_buf[128]; /* temporary result output */
- char *r_buf; /* block with resulting data */
- int r_offset = 0; /* current offset in r_buf */
- int ptr = 0; /* pointer */
- void *r_clientData; /* encode client data */
- int border;
- int numKeys = 0;
-
- r_clientData = (*is->method->code_start)(ISAMH_ENCODE);
- r_buf = is->merge_buf + 128;
-
- pp = isamh_pp_open (is, ipos);
- /* read first item from file. make sure f_more indicates no boundary */
- f_item_ptr = f_item;
- f_more = isamh_read_item (pp, &f_item_ptr);
- if (f_more > 0)
- f_more = 1;
- cat = pp->cat;
-
- if (debug > 1)
- logf (LOG_LOG, "isc: isamh_append begin %d %d", cat, pp->pos);
-
- /* read first item from i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr, &i_mode);
-
- mb[ptr].block = pp->pos; /* is zero if no block on disk */
- mb[ptr].dirty = 0;
- mb[ptr].offset = 0;
-
- border = is->method->filecat[cat].bsize;
- /* border = get_border (is, mb, ptr, cat, firstpos); */
- while (i_more || f_more)
- {
- char *r_item = r_item_buf;
- int cmp;
-
- if (f_more > 1)
- {
- /* block to block boundary in the original file. */
- f_more = 1;
- if (cat == pp->cat)
- {
- /* the resulting output is of the same category as the
- the original
- */
- if (r_offset <= mb[ptr].offset +is->method->filecat[cat].mfill)
- {
- /* the resulting output block is too small/empty. Delete
- the original (if any)
- */
- if (debug > 3)
- logf (LOG_LOG, "isc: release A");
- if (mb[ptr].block)
- isamh_release_block (is, pp->cat, mb[ptr].block);
- mb[ptr].block = pp->pos;
- if (!mb[ptr].dirty)
- mb[ptr].dirty = 1;
- if (ptr > 0)
- mb[ptr-1].dirty = 1;
- }
- else
- {
- /* indicate new boundary based on the original file */
- mb[++ptr].block = pp->pos;
- mb[ptr].dirty = last_dirty;
- mb[ptr].offset = r_offset;
- if (debug > 3)
- logf (LOG_LOG, "isc: bound ptr=%d,offset=%d",
- ptr, r_offset);
- if (cat==is->max_cat && ptr >= is->method->max_blocks_mem)
- {
- /* We are dealing with block(s) of max size. Block(s)
- except 1 will be flushed.
- */
- if (debug > 2)
- logf (LOG_LOG, "isc: flush A %d sections", ptr);
- flush_blocks ((ISAMC)is, mb, ptr-1, r_buf, &firstpos, cat,
- 0, &pp->numKeys);
- mb[0].block = mb[ptr-1].block;
- mb[0].dirty = mb[ptr-1].dirty;
- memcpy (r_buf, r_buf + mb[ptr-1].offset,
- mb[ptr].offset - mb[ptr-1].offset);
- mb[0].offset = 0;
-
- mb[1].block = mb[ptr].block;
- mb[1].dirty = mb[ptr].dirty;
- mb[1].offset = mb[ptr].offset - mb[ptr-1].offset;
- ptr = 1;
- r_offset = mb[ptr].offset;
- }
- }
- }
- /*border = get_border (is, mb, ptr, cat, firstpos);*/
- border = is->method->filecat[cat].bsize;
- }
- last_dirty = 0;
- if (!f_more)
- cmp = -1;
- else if (!i_more)
- cmp = 1;
- else
- cmp = (*is->method->compare_item)(i_item, f_item);
- if (cmp == 0) /* insert i=f */
- {
- if (!i_mode) /* delete item? */
- {
- /* move i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr,
- &i_mode);
- /* is next input item the same as current except
- for the delete flag? */
- cmp = (*is->method->compare_item)(i_item, f_item);
- if (!cmp && i_mode) /* delete/insert nop? */
- {
- /* yes! insert as if it was an insert only */
- memcpy (r_item, i_item, i_item_ptr - i_item);
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr,
- &i_mode);
- }
- else
- {
- /* no! delete the item */
- r_item = NULL;
- last_dirty = 1;
- mb[ptr].dirty = 2;
- }
- }
- else
- {
- memcpy (r_item, f_item, f_item_ptr - f_item);
-
- /* move i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr,
- &i_mode);
- }
- /* move f */
- f_item_ptr = f_item;
- f_more = isamh_read_item (pp, &f_item_ptr);
- }
- else if (cmp > 0) /* insert f */
- {
- memcpy (r_item, f_item, f_item_ptr - f_item);
- /* move f */
- f_item_ptr = f_item;
- f_more = isamh_read_item (pp, &f_item_ptr);
- }
- else /* insert i */
- {
- if (!i_mode) /* delete item which isn't there? */
- {
- logf (LOG_FATAL, "Inconsistent register at offset %d",
- r_offset);
- abort ();
- }
- memcpy (r_item, i_item, i_item_ptr - i_item);
- mb[ptr].dirty = 2;
- last_dirty = 1;
- /* move i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr,
- &i_mode);
- }
- if (r_item) /* insert resulting item? */
- {
- char *r_out_ptr = r_buf + r_offset;
- int new_offset;
-
- (*is->method->code_item)(ISAMH_ENCODE, r_clientData,
- &r_out_ptr, &r_item);
- new_offset = r_out_ptr - r_buf;
-
- numKeys++;
-
- if (border < new_offset && border >= r_offset)
- {
- if (debug > 2)
- logf (LOG_LOG, "isc: border %d %d", ptr, border);
- /* Max size of current block category reached ...
- make new virtual block entry */
- mb[++ptr].block = 0;
- mb[ptr].dirty = 1;
- mb[ptr].offset = r_offset;
- if (cat == is->max_cat && ptr >= is->method->max_blocks_mem)
- {
- /* We are dealing with block(s) of max size. Block(s)
- except one will be flushed. Note: the block(s) are
- surely not the last one(s).
- */
- if (debug > 2)
- logf (LOG_LOG, "isc: flush B %d sections", ptr-1);
- flush_blocks ((ISAMC)is, mb, ptr-1, r_buf, &firstpos, cat,
- 0, &pp->numKeys);
- mb[0].block = mb[ptr-1].block;
- mb[0].dirty = mb[ptr-1].dirty;
- memcpy (r_buf, r_buf + mb[ptr-1].offset,
- mb[ptr].offset - mb[ptr-1].offset);
- mb[0].offset = 0;
-
- mb[1].block = mb[ptr].block;
- mb[1].dirty = mb[0].dirty;
- mb[1].offset = mb[ptr].offset - mb[ptr-1].offset;
- memcpy (r_buf + mb[1].offset, r_buf + r_offset,
- new_offset - r_offset);
- new_offset = (new_offset - r_offset) + mb[1].offset;
- ptr = 1;
- }
- border = is->method->filecat[cat].bsize;
- /* get_border (is, mb, ptr, cat, firstpos); */
- }
- r_offset = new_offset;
- }
- if (cat < is->max_cat && ptr >= is->method->filecat[cat].mblocks)
- {
- /* Max number blocks in current category reached ->
- must switch to next category (with larger block size)
- */
- int j = 0;
-
- (is->files[cat].no_remap)++;
- /* delete all original block(s) read so far */
- for (i = 0; i < ptr; i++)
- if (mb[i].block)
- isamh_release_block (is, pp->cat, mb[i].block);
- /* also delete all block to be read in the future */
- pp->deleteFlag = 1;
-
- /* remap block offsets */
- assert (mb[j].offset == 0);
- cat++;
- mb[j].dirty = 1;
- mb[j].block = 0;
- mb[ptr].offset = r_offset;
- for (i = 1; i < ptr; i++)
- {
- int border = is->method->filecat[cat].ifill -
- ISAMH_BLOCK_OFFSET_1 + mb[j].offset;
- if (debug > 3)
- logf (LOG_LOG, "isc: remap %d border=%d", i, border);
- if (mb[i+1].offset > border && mb[i].offset <= border)
- {
- if (debug > 3)
- logf (LOG_LOG, "isc: to %d %d", j, mb[i].offset);
- mb[++j].dirty = 1;
- mb[j].block = 0;
- mb[j].offset = mb[i].offset;
- }
- }
- if (debug > 2)
- logf (LOG_LOG, "isc: remap from %d to %d sections to cat %d",
- ptr, j, cat);
- ptr = j;
- border = is->method->filecat[cat].bsize;
- /*border = get_border (is, mb, ptr, cat, firstpos);*/
- if (debug > 3)
- logf (LOG_LOG, "isc: border=%d r_offset=%d", border, r_offset);
- }
- }
- if (mb[ptr].offset < r_offset)
- { /* make the final boundary offset */
- mb[++ptr].dirty = 1;
- mb[ptr].block = 0;
- mb[ptr].offset = r_offset;
- }
- else
- { /* empty output. Release last block if any */
- if (cat == pp->cat && mb[ptr].block)
- {
- if (debug > 3)
- logf (LOG_LOG, "isc: release C");
- isamh_release_block (is, pp->cat, mb[ptr].block);
- mb[ptr].block = 0;
- if (ptr > 0)
- mb[ptr-1].dirty = 1;
- }
- }
-
- if (debug > 2)
- logf (LOG_LOG, "isc: flush C, %d sections", ptr);
-
- if (firstpos)
- {
- /* we have to patch initial block with num keys if that
- has changed */
- if (numKeys != isamh_pp_num (pp))
- {
- if (debug > 2)
- logf (LOG_LOG, "isc: patch num keys firstpos=%d num=%d",
- firstpos, numKeys);
- bf_write (is->files[cat].bf, firstpos, ISAMH_BLOCK_OFFSET_N,
- sizeof(numKeys), &numKeys);
- }
- }
- else if (ptr > 0)
- { /* we haven't flushed initial block yet and there surely are some
- blocks to flush. Make first block dirty if numKeys differ */
- if (numKeys != isamh_pp_num (pp))
- mb[0].dirty = 1;
- }
- /* flush rest of block(s) in r_buf */
- flush_blocks ((ISAMC)is, mb, ptr, r_buf, &firstpos, cat, 1, &numKeys);
-
- (*is->method->code_stop)(ISAMH_ENCODE, r_clientData);
- if (!firstpos)
- cat = 0;
- if (debug > 1)
- logf (LOG_LOG, "isc: isamh_append return %d %d", cat, firstpos);
- isamh_pp_close (pp);
- return cat + firstpos * 8;
-}
-
-
-/*
- * $Log: merge.c,v $
- * Revision 1.12 1999-06-30 15:03:55 heikki
- * first take on isamh, the append-only isam structure
- *
- * Revision 1.11 1999/05/26 07:49:14 adam
- * C++ compilation.
- *
- * Revision 1.10 1998/03/19 12:22:09 adam
- * Minor change.
- *
- * Revision 1.9 1998/03/19 10:04:38 adam
- * Minor changes.
- *
- * Revision 1.8 1998/03/18 09:23:55 adam
- * Blocks are stored in chunks on free list - up to factor 2 in speed.
- * Fixed bug that could occur in block category rearrangemen.
- *
- * Revision 1.7 1998/03/11 11:18:18 adam
- * Changed the isc_merge to take into account the mfill (minimum-fill).
- *
- * Revision 1.6 1998/03/06 13:54:03 adam
- * Fixed two nasty bugs in isc_merge.
- *
- * Revision 1.5 1997/02/12 20:42:43 adam
- * Bug fix: during isc_merge operations, some pages weren't marked dirty
- * even though they should be. At this point the merge operation marks
- * a page dirty if the previous page changed at all. A better approach is
- * to mark it dirty if the last key written changed in previous page.
- *
- * Revision 1.4 1996/11/08 11:15:31 adam
- * Number of keys in chain are stored in first block and the function
- * to retrieve this information, isc_pp_num is implemented.
- *
- * Revision 1.3 1996/11/04 14:08:59 adam
- * Optimized free block usage.
- *
- * Revision 1.2 1996/11/01 13:36:46 adam
- * New element, max_blocks_mem, that control how many blocks of max size
- * to store in memory during isc_merge.
- * Function isc_merge now ignores delete/update of identical keys and
- * the proper blocks are then non-dirty and not written in flush_blocks.
- *
- * Revision 1.1 1996/11/01 08:59:15 adam
- * First version of isc_merge that supports update/delete.
- *
- */
-
-