/*
- * Copyright (c) 1995-1996, Index Data.
+ * Copyright (c) 1995-1998, Index Data.
* See the file LICENSE for details.
* Sebastian Hammer, Adam Dickmeiss
*
* $Log: isamc.c,v $
- * Revision 1.2 1996-10-29 16:44:56 adam
+ * Revision 1.17 1999-05-26 07:49:14 adam
+ * C++ compilation.
+ *
+ * Revision 1.16 1998/05/27 14:32:03 adam
+ * Changed default block category layout.
+ *
+ * Revision 1.15 1998/05/20 10:12:25 adam
+ * Implemented automatic EXPLAIN database maintenance.
+ * Modified Zebra to work with ASN.1 compiled version of YAZ.
+ *
+ * Revision 1.14 1998/03/19 10:04:35 adam
+ * Minor changes.
+ *
+ * Revision 1.13 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 1.12 1998/03/16 10:37:24 adam
+ * Added more statistics.
+ *
+ * Revision 1.11 1998/03/13 15:30:50 adam
+ * New functions isc_block_used and isc_block_size. Fixed 'leak'
+ * in isc_alloc_block.
+ *
+ * Revision 1.10 1998/03/11 11:18:18 adam
+ * Changed the isc_merge to take into account the mfill (minimum-fill).
+ *
+ * Revision 1.9 1998/03/06 13:54:02 adam
+ * Fixed two nasty bugs in isc_merge.
+ *
+ * Revision 1.8 1997/09/17 12:19:20 adam
+ * Zebra version corresponds to YAZ version 1.4.
+ * Changed Zebra server so that it doesn't depend on global common_resource.
+ *
+ * Revision 1.7 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 1.6 1996/11/08 11:15:29 adam
+ * Number of keys in chain are stored in first block and the function
+ * to retrieve this information, isc_pp_num is implemented.
+ *
+ * Revision 1.5 1996/11/04 14:08:57 adam
+ * Optimized free block usage.
+ *
+ * Revision 1.4 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 1.3 1996/11/01 08:59:14 adam
+ * First version of isc_merge that supports update/delete.
+ *
+ * Revision 1.2 1996/10/29 16:44:56 adam
* Work on isc_merge.
*
* Revision 1.1 1996/10/29 13:40:48 adam
*
*/
+/*
+ * TODO:
+ * Reduction to lower categories in isc_merge
+ */
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <log.h>
#include "isamc-p.h"
+static void flush_block (ISAMC is, int cat);
+static void release_fc (ISAMC is, int cat);
+static void init_fc (ISAMC is, int cat);
+
+#define ISAMC_FREELIST_CHUNK 1
+
+#define SMALL_TEST 0
+
ISAMC_M isc_getmethod (void)
{
static struct ISAMC_filecat_s def_cat[] = {
- { 32, 28, 0, 20 },
- { 512, 490, 100, 20 },
- { 4096, 3950, 1000, 20 },
- {32768, 32000, 10000, 0 },
- { 0, 0, 0, 0 }
+#if SMALL_TEST
+ { 32, 28, 0, 3 },
+ { 64, 54, 30, 0 },
+#else
+ { 24, 22, 18, 10 },
+ { 128, 120, 100, 10 },
+ { 512, 490, 350, 10 },
+ { 2048, 1900, 1700, 10 },
+ { 8192, 8000, 7900, 10 },
+ { 32768, 32000, 31000, 0 },
+#endif
};
- ISAMC_M m = xmalloc (sizeof(*m));
+ ISAMC_M m = (ISAMC_M) xmalloc (sizeof(*m));
m->filecat = def_cat;
m->code_start = NULL;
m->compare_item = NULL;
- m->debug = 0;
+ m->debug = 1;
+
+ m->max_blocks_mem = 10;
return m;
}
-ISAMC isc_open (const char *name, int writeflag, ISAMC_M method)
+ISAMC isc_open (BFiles bfs, const char *name, int writeflag, ISAMC_M method)
{
ISAMC is;
ISAMC_filecat filecat;
- int i;
+ int i = 0;
int max_buf_size = 0;
- is = xmalloc (sizeof(*is));
+ is = (ISAMC) xmalloc (sizeof(*is));
- is->method = xmalloc (sizeof(*is->method));
+ is->method = (ISAMC_M) xmalloc (sizeof(*is->method));
memcpy (is->method, method, sizeof(*method));
filecat = is->method->filecat;
assert (filecat);
/* determine number of block categories */
if (is->method->debug)
logf (LOG_LOG, "isc: bsize ifill mfill mblocks");
- for (i = 0; filecat[i].bsize; i++)
+ do
{
if (is->method->debug)
logf (LOG_LOG, "isc:%6d %6d %6d %6d",
filecat[i].mfill, filecat[i].mblocks);
if (max_buf_size < filecat[i].mblocks * filecat[i].bsize)
max_buf_size = filecat[i].mblocks * filecat[i].bsize;
- }
+ } while (filecat[i++].mblocks);
is->no_files = i;
is->max_cat = --i;
/* max_buf_size is the larget buffer to be used during merge */
max_buf_size = (1 + max_buf_size / filecat[i].bsize) * filecat[i].bsize;
+ if (max_buf_size < (1+is->method->max_blocks_mem) * filecat[i].bsize)
+ max_buf_size = (1+is->method->max_blocks_mem) * filecat[i].bsize;
if (is->method->debug)
logf (LOG_LOG, "isc: max_buf_size %d", max_buf_size);
assert (is->no_files > 0);
- is->files = xmalloc (sizeof(*is->files)*i);
- is->r_buf = xmalloc (max_buf_size+128);
+ is->files = (ISAMC_file) xmalloc (sizeof(*is->files)*is->no_files);
+ if (writeflag)
+ {
+ is->merge_buf = (char *) xmalloc (max_buf_size+256);
+ memset (is->merge_buf, 0, max_buf_size+256);
+ }
+ else
+ is->merge_buf = NULL;
for (i = 0; i<is->no_files; i++)
{
char fname[512];
sprintf (fname, "%s%c", name, i+'A');
- is->files[i].bf = bf_open (fname, is->method->filecat[i].bsize,
+ is->files[i].bf = bf_open (bfs, fname, is->method->filecat[i].bsize,
writeflag);
is->files[i].head_is_dirty = 0;
if (!bf_read (is->files[i].bf, 0, 0, sizeof(ISAMC_head),
is->files[i].head.lastblock = 1;
is->files[i].head.freelist = 0;
}
+ is->files[i].alloc_entries_num = 0;
+ is->files[i].alloc_entries_max =
+ is->method->filecat[i].bsize / sizeof(int) - 1;
+ is->files[i].alloc_buf = (char *)
+ xmalloc (is->method->filecat[i].bsize);
+ is->files[i].no_writes = 0;
+ is->files[i].no_reads = 0;
+ is->files[i].no_skip_writes = 0;
+ is->files[i].no_allocated = 0;
+ is->files[i].no_released = 0;
+ is->files[i].no_remap = 0;
+ is->files[i].no_forward = 0;
+ is->files[i].no_backward = 0;
+ is->files[i].sum_forward = 0;
+ is->files[i].sum_backward = 0;
+ is->files[i].no_next = 0;
+ is->files[i].no_prev = 0;
+
+ init_fc (is, i);
}
return is;
}
+int isc_block_used (ISAMC is, int type)
+{
+ if (type < 0 || type >= is->no_files)
+ return -1;
+ return is->files[type].head.lastblock-1;
+}
+
+int isc_block_size (ISAMC is, int type)
+{
+ ISAMC_filecat filecat = is->method->filecat;
+ if (type < 0 || type >= is->no_files)
+ return -1;
+ return filecat[type].bsize;
+}
+
int isc_close (ISAMC is)
{
int i;
+ if (is->method->debug)
+ {
+ logf (LOG_LOG, "isc: next forw mid-f prev backw mid-b");
+ for (i = 0; i<is->no_files; i++)
+ logf (LOG_LOG, "isc:%8d%8d%8.1f%8d%8d%8.1f",
+ is->files[i].no_next,
+ is->files[i].no_forward,
+ is->files[i].no_forward ?
+ (double) is->files[i].sum_forward/is->files[i].no_forward
+ : 0.0,
+ is->files[i].no_prev,
+ is->files[i].no_backward,
+ is->files[i].no_backward ?
+ (double) is->files[i].sum_backward/is->files[i].no_backward
+ : 0.0);
+ }
+ if (is->method->debug)
+ logf (LOG_LOG, "isc: writes reads skipped alloc released remap");
for (i = 0; i<is->no_files; i++)
- if (is->files[i].bf)
- {
- if (is->files[i].head_is_dirty)
- bf_write (is->files[i].bf, 0, 0, sizeof(ISAMC_head),
- &is->files[i].head);
- bf_close (is->files[i].bf);
- }
+ {
+ release_fc (is, i);
+ assert (is->files[i].bf);
+ if (is->files[i].head_is_dirty)
+ bf_write (is->files[i].bf, 0, 0, sizeof(ISAMC_head),
+ &is->files[i].head);
+ if (is->method->debug)
+ logf (LOG_LOG, "isc:%8d%8d%8d%8d%8d%8d",
+ is->files[i].no_writes,
+ is->files[i].no_reads,
+ is->files[i].no_skip_writes,
+ is->files[i].no_allocated,
+ is->files[i].no_released,
+ is->files[i].no_remap);
+ xfree (is->files[i].fc_list);
+ flush_block (is, i);
+ bf_close (is->files[i].bf);
+ }
xfree (is->files);
- xfree (is->r_buf);
+ xfree (is->merge_buf);
+ xfree (is->method);
xfree (is);
return 0;
}
int isc_read_block (ISAMC is, int cat, int pos, char *dst)
{
- if (is->method->debug > 1)
- logf (LOG_LOG, "isc: read_block %d %d", cat, pos);
+ ++(is->files[cat].no_reads);
return bf_read (is->files[cat].bf, pos, 0, 0, dst);
}
int isc_write_block (ISAMC is, int cat, int pos, char *src)
{
- if (is->method->debug > 1)
+ ++(is->files[cat].no_writes);
+ if (is->method->debug > 2)
logf (LOG_LOG, "isc: write_block %d %d", cat, pos);
return bf_write (is->files[cat].bf, pos, 0, 0, src);
}
int isc_write_dblock (ISAMC is, int cat, int pos, char *src,
int nextpos, int offset)
{
- int xoffset = offset + 2*sizeof(int);
+ ISAMC_BLOCK_SIZE size = offset + ISAMC_BLOCK_OFFSET_N;
if (is->method->debug > 2)
- logf (LOG_LOG, "isc: write_dblock. offset=%d nextpos=%d",
- offset, nextpos);
- memcpy (src - sizeof(int)*2, &nextpos, sizeof(int));
- memcpy (src - sizeof(int), &xoffset, sizeof(int));
- return isc_write_block (is, cat, pos, src - sizeof(int)*2);
+ logf (LOG_LOG, "isc: write_dblock. size=%d nextpos=%d",
+ (int) size, nextpos);
+ src -= ISAMC_BLOCK_OFFSET_N;
+ memcpy (src, &nextpos, sizeof(int));
+ memcpy (src + sizeof(int), &size, sizeof(size));
+ return isc_write_block (is, cat, pos, src);
}
-int isc_alloc_block (ISAMC is, int cat)
+#if ISAMC_FREELIST_CHUNK
+static void flush_block (ISAMC is, int cat)
+{
+ char *abuf = is->files[cat].alloc_buf;
+ int block = is->files[cat].head.freelist;
+ if (block && is->files[cat].alloc_entries_num)
+ {
+ memcpy (abuf, &is->files[cat].alloc_entries_num, sizeof(int));
+ bf_write (is->files[cat].bf, block, 0, 0, abuf);
+ is->files[cat].alloc_entries_num = 0;
+ }
+ xfree (abuf);
+}
+
+static int alloc_block (ISAMC is, int cat)
+{
+ int block = is->files[cat].head.freelist;
+ char *abuf = is->files[cat].alloc_buf;
+
+ (is->files[cat].no_allocated)++;
+
+ if (!block)
+ {
+ block = (is->files[cat].head.lastblock)++; /* no free list */
+ is->files[cat].head_is_dirty = 1;
+ }
+ else
+ {
+ if (!is->files[cat].alloc_entries_num) /* read first time */
+ {
+ bf_read (is->files[cat].bf, block, 0, 0, abuf);
+ memcpy (&is->files[cat].alloc_entries_num, abuf,
+ sizeof(is->files[cat].alloc_entries_num));
+ assert (is->files[cat].alloc_entries_num > 0);
+ }
+ /* have some free blocks now */
+ assert (is->files[cat].alloc_entries_num > 0);
+ is->files[cat].alloc_entries_num--;
+ if (!is->files[cat].alloc_entries_num) /* last one in block? */
+ {
+ memcpy (&is->files[cat].head.freelist, abuf + sizeof(int),
+ sizeof(int));
+ is->files[cat].head_is_dirty = 1;
+
+ if (is->files[cat].head.freelist)
+ {
+ bf_read (is->files[cat].bf, is->files[cat].head.freelist,
+ 0, 0, abuf);
+ memcpy (&is->files[cat].alloc_entries_num, abuf,
+ sizeof(is->files[cat].alloc_entries_num));
+ assert (is->files[cat].alloc_entries_num);
+ }
+ }
+ else
+ memcpy (&block, abuf + sizeof(int) + sizeof(int) *
+ is->files[cat].alloc_entries_num, sizeof(int));
+ }
+ return block;
+}
+
+static void release_block (ISAMC is, int cat, int pos)
+{
+ char *abuf = is->files[cat].alloc_buf;
+ int block = is->files[cat].head.freelist;
+
+ (is->files[cat].no_released)++;
+
+ if (block && !is->files[cat].alloc_entries_num) /* must read block */
+ {
+ bf_read (is->files[cat].bf, block, 0, 0, abuf);
+ memcpy (&is->files[cat].alloc_entries_num, abuf,
+ sizeof(is->files[cat].alloc_entries_num));
+ assert (is->files[cat].alloc_entries_num > 0);
+ }
+ assert (is->files[cat].alloc_entries_num <= is->files[cat].alloc_entries_max);
+ if (is->files[cat].alloc_entries_num == is->files[cat].alloc_entries_max)
+ {
+ assert (block);
+ memcpy (abuf, &is->files[cat].alloc_entries_num, sizeof(int));
+ bf_write (is->files[cat].bf, block, 0, 0, abuf);
+ is->files[cat].alloc_entries_num = 0;
+ }
+ if (!is->files[cat].alloc_entries_num) /* make new buffer? */
+ {
+ memcpy (abuf + sizeof(int), &block, sizeof(int));
+ is->files[cat].head.freelist = pos;
+ is->files[cat].head_is_dirty = 1;
+ }
+ else
+ {
+ memcpy (abuf + sizeof(int) +
+ is->files[cat].alloc_entries_num*sizeof(int),
+ &pos, sizeof(int));
+ }
+ is->files[cat].alloc_entries_num++;
+}
+#else
+static void flush_block (ISAMC is, int cat)
+{
+ char *abuf = is->files[cat].alloc_buf;
+ xfree (abuf);
+}
+
+static int alloc_block (ISAMC is, int cat)
{
int block;
char buf[sizeof(int)];
is->files[cat].head_is_dirty = 1;
+ (is->files[cat].no_allocated)++;
if ((block = is->files[cat].head.freelist))
{
bf_read (is->files[cat].bf, block, 0, sizeof(int), buf);
}
else
block = (is->files[cat].head.lastblock)++;
- if (is->method->debug > 2)
- logf (LOG_LOG, "isc: alloc_block in cat %d -> %d", cat, block);
return block;
}
-void isc_release_block (ISAMC is, int cat, int pos)
+static void release_block (ISAMC is, int cat, int pos)
{
char buf[sizeof(int)];
+ (is->files[cat].no_released)++;
is->files[cat].head_is_dirty = 1;
memcpy (buf, &is->files[cat].head.freelist, sizeof(int));
is->files[cat].head.freelist = pos;
bf_write (is->files[cat].bf, pos, 0, sizeof(int), buf);
}
+#endif
-static void isc_flush_blocks (ISAMC is, int *r_ptr, int r_ptri, char *r_buf,
- int *nextpos, int *firstpos, int cat, int last)
+int isc_alloc_block (ISAMC is, int cat)
{
- int i;
-
- for (i = 1; i<r_ptri; i++)
- {
- int pos;
- if (*nextpos)
- pos = *nextpos;
- else
- pos = isc_alloc_block (is, cat);
- if (!*firstpos)
- *firstpos = pos;
- if (last && i == r_ptri-1)
- *nextpos = 0;
- else
- *nextpos = isc_alloc_block (is, cat);
- isc_write_dblock (is, cat, pos, r_buf + r_ptr[i-1], *nextpos,
- r_ptr[i] - r_ptr[i-1]);
- }
-}
+ int block = 0;
-
-ISAMC_P isc_merge_first (ISAMC is, ISAMC_I data)
-{
- char i_item[128], *i_item_ptr;
- int i_more, i_mode, i;
-
- int firstpos = 0;
- int nextpos = 0;
- int cat = 0;
- char r_item_buf[128];
- int r_offset = 0;
- int r_ptr[100];
- int r_ptri = 0;
- void *r_clientData = (*is->method->code_start)(ISAMC_ENCODE);
- char *r_buf = is->r_buf + ISAMC_BLOCK_OFFSET;
-
- /* read first item from i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr, &i_mode);
- if (i_more)
- r_ptr[r_ptri++] = 0;
- while (i_more)
+ if (is->files[cat].fc_list)
{
- char *r_item = r_item_buf;
-
- memcpy (r_item, i_item, i_item_ptr - i_item);
-
- if (r_item) /* insert resulting item? */
- {
- char *r_out_ptr = r_buf + r_offset;
- int new_offset;
- int border = r_ptr[r_ptri-1] + is->method->filecat[cat].ifill
- -ISAMC_BLOCK_OFFSET;
-
- (*is->method->code_item)(ISAMC_ENCODE, r_clientData,
- &r_out_ptr, &r_item);
- new_offset = r_out_ptr - r_buf;
-
- if (border >= r_offset && border < new_offset)
+ int j, nb;
+ for (j = 0; j < is->files[cat].fc_max; j++)
+ if ((nb = is->files[cat].fc_list[j]) && (!block || nb < block))
{
- /* Initial fill of current block category reached...
- Save offset in r_ptr
- */
- r_ptr[r_ptri++] = r_offset;
- if (cat == is->max_cat)
- {
- /* We are dealing with block of max size. Block(s)
- will be flushed. Note: the block(s) are surely not
- the last one(s).
- */
- if (is->method->debug > 1)
- logf (LOG_LOG, "isc: flush %d sections", r_ptri-1);
- isc_flush_blocks (is, r_ptr, r_ptri, r_buf,
- &nextpos, &firstpos, cat, 0);
- r_ptri = 0;
- r_ptr[r_ptri++] = 0;
- memcpy (r_buf, r_buf + r_offset, new_offset - r_offset);
- new_offset = (new_offset - r_offset);
- }
+ is->files[cat].fc_list[j] = 0;
+ block = nb;
+ break;
}
- r_offset = new_offset;
- if (cat < is->max_cat &&
- r_ptri>is->method->filecat[cat].mblocks)
- {
- /* Max number blocks in current category reached ->
- must switch to next category (with larger block size)
- */
- int j = 1;
- cat++;
- /* r_ptr[0] = r_ptr[0] = 0 true anyway.. */
- for (i = 2; i < r_ptri; i++)
- {
- border = is->method->filecat[cat].ifill -
- ISAMC_BLOCK_OFFSET + r_ptr[j-1];
- if (r_ptr[i] > border && r_ptr[i-1] <= border)
- r_ptr[j++] = r_ptr[i-1];
- }
- r_ptri = j;
- }
- }
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr, &i_mode);
}
- r_ptr[r_ptri++] = r_offset;
- /* flush rest of block(s) in r_buf */
- if (is->method->debug > 1)
- logf (LOG_LOG, "isc: flush rest, %d sections", r_ptri-1);
- isc_flush_blocks (is, r_ptr, r_ptri, r_buf, &nextpos, &firstpos, cat, 1);
- (*is->method->code_stop)(ISAMC_ENCODE, r_clientData);
- return cat + firstpos * 8;
+ if (!block)
+ block = alloc_block (is, cat);
+ if (is->method->debug > 3)
+ logf (LOG_LOG, "isc: alloc_block in cat %d: %d", cat, block);
+ return block;
}
-ISAMC_P isc_merge (ISAMC is, ISAMC_P ipos, ISAMC_I data)
+void isc_release_block (ISAMC is, int cat, int pos)
{
- char i_item[128], *i_item_ptr;
- int i_more, i_mode, i;
-
- ISAMC_PP pp;
- char f_item[128], *f_item_ptr;
- int f_more;
- int block_ptr[100]; /* block pointer (0 if none) */
- int dirty_ptr[100]; /* dirty flag pointer (1 if dirty) */
-
- int firstpos = 0;
- int nextpos = 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 r_ptr[100]; /* offset pointer */
- int r_ptri = 0; /* pointer */
- void *r_clientData; /* encode client data */
-
- if (ipos == 0)
- return isc_merge_first (is, data);
-
- r_clientData = (*is->method->code_start)(ISAMC_ENCODE);
- r_buf = is->r_buf + ISAMC_BLOCK_OFFSET;
-
- pp = isc_pp_open (is, ipos);
- f_item_ptr = f_item;
- f_more = isc_read_item (pp, &f_item_ptr);
- cat = pp->cat;
-
- /* read first item from i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr, &i_mode);
- block_ptr[r_ptri] = pp->pos;
- dirty_ptr[r_ptri] = 0;
- r_ptr[r_ptri++] = 0;
-
- while (i_more || f_more)
+ if (is->method->debug > 3)
+ logf (LOG_LOG, "isc: release_block in cat %d: %d", cat, pos);
+ if (is->files[cat].fc_list)
{
- char *r_item = r_item_buf;
- int cmp;
-
- 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)
- {
- r_item = NULL;
- dirty_ptr[r_ptri-1] = 1;
- }
- 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 = isc_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);
- }
- else /* insert i */
- {
- if (!i_mode) /* delete item which isn't there? */
+ int j;
+ for (j = 0; j<is->files[cat].fc_max; j++)
+ if (!is->files[cat].fc_list[j])
{
- logf (LOG_FATAL, "Inconsistent register");
- abort ();
+ is->files[cat].fc_list[j] = pos;
+ return;
}
- memcpy (r_item, i_item, i_item_ptr - i_item);
- dirty_ptr[r_ptri-1] = 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;
- int border;
-
- /* border set to initial fill or block size depending on
- whether we are creating a new one or updating and old
- */
- if (block_ptr[r_ptri-1])
- border = r_ptr[r_ptri-1] + is->method->filecat[cat].bsize
- -ISAMC_BLOCK_OFFSET;
- else
- border = r_ptr[r_ptri-1] + is->method->filecat[cat].ifill
- -ISAMC_BLOCK_OFFSET;
-
- (*is->method->code_item)(ISAMC_ENCODE, r_clientData,
- &r_out_ptr, &r_item);
- new_offset = r_out_ptr - r_buf;
-
- if (border >= r_offset && border < new_offset)
- {
- /* Initial fill of current block category reached...
- Save offset in r_ptr
- */
- r_ptr[r_ptri++] = r_offset;
- if (cat == is->max_cat)
- {
- /* We are dealing with block of max size. Block(s)
- will be flushed. Note: the block(s) are surely not
- the last one(s).
- */
- if (is->method->debug > 1)
- logf (LOG_LOG, "isc: flush %d sections", r_ptri-1);
- isc_flush_blocks (is, r_ptr, r_ptri, r_buf,
- &nextpos, &firstpos, cat, 0);
- r_ptri = 0;
- r_ptr[r_ptri++] = 0;
- memcpy (r_buf, r_buf + r_offset, new_offset - r_offset);
- new_offset = (new_offset - r_offset);
- }
- }
- r_offset = new_offset;
- if (cat < is->max_cat &&
- r_ptri>is->method->filecat[cat].mblocks)
- {
- /* Max number blocks in current category reached ->
- must switch to next category (with larger block size)
- */
- int j = 1;
- cat++;
- /* r_ptr[0] = r_ptr[0] = 0 true anyway.. */
- /* AD: Any old blocks should be deleted */
- for (i = 2; i < r_ptri; i++)
- {
- border = is->method->filecat[cat].ifill -
- ISAMC_BLOCK_OFFSET + r_ptr[j-1];
- if (r_ptr[i] > border && r_ptr[i-1] <= border)
- r_ptr[j++] = r_ptr[i-1];
- }
- r_ptri = j;
- }
- }
}
- r_ptr[r_ptri++] = r_offset;
- /* flush rest of block(s) in r_buf */
- if (is->method->debug > 1)
- logf (LOG_LOG, "isc: flush rest, %d sections", r_ptri-1);
- isc_flush_blocks (is, r_ptr, r_ptri, r_buf, &nextpos, &firstpos, cat, 1);
- (*is->method->code_stop)(ISAMC_ENCODE, r_clientData);
- return cat + firstpos * 8;
+ release_block (is, cat, pos);
}
-
-#if 0
-ISAMC_P isc_merge (ISAMC is, ISAMC_P ipos, ISAMC_I data)
+static void init_fc (ISAMC is, int cat)
{
- ISAMC_PP pp;
- char f_item[128], *f_item_ptr;
- int f_more;
- int cat = 0;
- int nextpos;
-
- char i_item[128], *i_item_ptr;
- int i_more, insertMode;
-
- char r_item_buf[128];
- int r_offset = ISAMC_BLOCK_OFFSET;
- int r_dirty = 0;
- char *r_ptr[100];
- int r_ptri = 0;
- int r_start = 0;
- void *r_clientData = (*is->method->code_start)();
-
- /* rewind and read first item from file */
- pp = isc_position (is, ipos);
- f_item_ptr = f_item;
- f_more = isc_read_item (pp, &f_item_ptr);
- cat = pp->cat;
-
- /* read first item from i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr, &insertMode);
-
- while (f_more || i_more)
- {
- int cmp;
- char *r_item = r_item_buf;
-
- 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 (!insertMode)
- {
- r_item = NULL;
- r_dirty = 1;
- }
- 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,
- &insertMode);
- /* move f */
- f_item_ptr = f_item;
- f_more = isc_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);
- }
- else /* insert i */
- {
- if (!insertMode) /* delete item which isn't there? */
- {
- logf (LOG_FATAL, "Inconsistent register");
- abort ();
- }
- memcpy (r_item, i_item, i_item_ptr - i_item);
- r_dirty = 1;
- /* move i */
- i_item_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_item_ptr,
- &insertMode);
- }
- /* check for end of input block condition */
-
- if (r_item) /* insert resulting item? */
- {
- char *r_out_ptr = is->r_buf + r_offset;
- int new_offset;
- int border = is->method->filecat[cat].initsize - r_start;
+ int j = 100;
+
+ is->files[cat].fc_max = j;
+ is->files[cat].fc_list = (int *)
+ xmalloc (sizeof(*is->files[0].fc_list) * j);
+ while (--j >= 0)
+ is->files[cat].fc_list[j] = 0;
+}
- (*is->method->code_item)(r_clientData, &r_out_ptr, &r_item);
- new_offset = r_out_ptr - is->r_buf;
+static void release_fc (ISAMC is, int cat)
+{
+ int b, j = is->files[cat].fc_max;
- if (border >= r_offset && border < r_newoffset)
- {
- r_ptr[r_ptri++] = r_offset;
- if (!is->method->filecat[cat].mblocks)
- {
- assert (r_ptri == 1);
- /* dump block from 0 -> r_offset in max cat */
- r_ptri = 0;
- r_offset = ISAMC_BLOCK_OFFSET;
- }
- }
- r_offset = new_offset;
- }
- if (r_ptri && r_ptri == is->method->filecat[cat].mblocks)
+ while (--j >= 0)
+ if ((b = is->files[cat].fc_list[j]))
{
- int i, j = 0;
-
- /* dump previous blocks in chain */
-
- /* recalc r_ptr's */
- cat++;
- for (i = 1; i<r_ptr; i++)
- {
- if (r_ptr[i] > is->method->filecat[cat].ifill &&
- r_ptr[i-1] <= is->method->filecat[cat].ifill)
- r_ptr[j++] = r_ptr[i-1];
- }
- r_ptri = j;
+ release_block (is, cat, b);
+ is->files[cat].fc_list[j] = 0;
}
- }
- (*is->method->code_stop)(r_clientData);
- return ipos;
}
-#endif
void isc_pp_close (ISAMC_PP pp)
{
ISAMC_PP isc_pp_open (ISAMC is, ISAMC_P ipos)
{
- ISAMC_PP pp = xmalloc (sizeof(*pp));
+ ISAMC_PP pp = (ISAMC_PP) xmalloc (sizeof(*pp));
char *src;
pp->cat = isc_type(ipos);
- pp->next = isc_block(ipos);
+ pp->pos = isc_block(ipos);
- src = pp->buf = xmalloc (is->method->filecat[pp->cat].bsize);
+ src = pp->buf = (char *) xmalloc (is->method->filecat[pp->cat].bsize);
- pp->pos = 0;
+ pp->next = 0;
pp->size = 0;
pp->offset = 0;
pp->is = is;
pp->decodeClientData = (*is->method->code_start)(ISAMC_DECODE);
+ pp->deleteFlag = 0;
+ pp->numKeys = 0;
+
+ if (pp->pos)
+ {
+ src = pp->buf;
+ isc_read_block (is, pp->cat, pp->pos, src);
+ memcpy (&pp->next, src, sizeof(pp->next));
+ src += sizeof(pp->next);
+ memcpy (&pp->size, src, sizeof(pp->size));
+ src += sizeof(pp->size);
+ memcpy (&pp->numKeys, src, sizeof(pp->numKeys));
+ src += sizeof(pp->numKeys);
+ assert (pp->next != pp->pos);
+ pp->offset = src - pp->buf;
+ assert (pp->offset == ISAMC_BLOCK_OFFSET_1);
+ if (is->method->debug > 2)
+ logf (LOG_LOG, "isc: read_block size=%d %d %d next=%d",
+ pp->size, pp->cat, pp->pos, pp->next);
+ }
return pp;
}
-/* returns 1 if item could be read; 0 otherwise */
-int isc_read_key (ISAMC_PP pp, void *buf)
+/* returns non-zero if item could be read; 0 otherwise */
+int isc_pp_read (ISAMC_PP pp, void *buf)
{
return isc_read_item (pp, (char **) &buf);
}
-/* returns 1 if item could be read; 0 otherwise */
+/* read one item from file - decode and store it in *dst.
+ Returns
+ 0 if end-of-file
+ 1 if item could be read ok and NO boundary
+ 2 if item could be read ok and boundary */
int isc_read_item (ISAMC_PP pp, char **dst)
{
ISAMC is = pp->is;
if (pp->offset >= pp->size)
{
+ if (!pp->next)
+ {
+ pp->pos = 0;
+ return 0; /* end of file */
+ }
+ if (pp->next > pp->pos)
+ {
+ if (pp->next == pp->pos + 1)
+ is->files[pp->cat].no_next++;
+ else
+ {
+ is->files[pp->cat].no_forward++;
+ is->files[pp->cat].sum_forward += pp->next - pp->pos;
+ }
+ }
+ else
+ {
+ if (pp->next + 1 == pp->pos)
+ is->files[pp->cat].no_prev++;
+ else
+ {
+ is->files[pp->cat].no_backward++;
+ is->files[pp->cat].sum_backward += pp->pos - pp->next;
+ }
+ }
+ /* out new block position */
pp->pos = pp->next;
- if (!pp->pos)
- return 0;
src = pp->buf;
+ /* read block and save 'next' and 'size' entry */
isc_read_block (is, pp->cat, pp->pos, src);
-
memcpy (&pp->next, src, sizeof(pp->next));
src += sizeof(pp->next);
memcpy (&pp->size, src, sizeof(pp->size));
src += sizeof(pp->size);
/* assume block is non-empty */
+ assert (src - pp->buf == ISAMC_BLOCK_OFFSET_N);
assert (pp->next != pp->pos);
+ if (pp->deleteFlag)
+ isc_release_block (is, pp->cat, pp->pos);
+ (*is->method->code_item)(ISAMC_DECODE, pp->decodeClientData, dst, &src);
+ pp->offset = src - pp->buf;
+ if (is->method->debug > 2)
+ logf (LOG_LOG, "isc: read_block size=%d %d %d next=%d",
+ pp->size, pp->cat, pp->pos, pp->next);
+ return 2;
}
(*is->method->code_item)(ISAMC_DECODE, pp->decodeClientData, dst, &src);
pp->offset = src - pp->buf;
return 1;
}
-int isc_read_islast (ISAMC_PP pp)
+int isc_pp_num (ISAMC_PP pp)
{
- return pp->offset >= pp->size;
-}
-
-int isc_numkeys (ISAMC_PP pp)
-{
- return 1;
+ return pp->numKeys;
}
projects / idzebra-moved-to-github.git / blobdiff