+++ /dev/null
-/*
- * Copyright (c) 1995-1998, Index Data.
- * See the file LICENSE for details.
- * Heikki Levanto
- *
- * Isamh - append-only isam
- *
- * todo
- * implement dirty bit
- * implement direct address bit
- * (result set stuff)
- *
- */
-
-
-
-
-#include <stdlib.h>
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-
-#include <log.h>
-#include "isamh-p.h"
-
-#include "../index/index.h" /* for dump */
-
-static void flush_block (ISAMH is, int cat);
-static void release_fc (ISAMH is, int cat);
-static void init_fc (ISAMH is, int cat);
-
-#define ISAMH_FREELIST_CHUNK 1
-
-#define SMALL_TEST 1
-
-ISAMH_M isamh_getmethod (void)
-{
- static struct ISAMH_filecat_s def_cat[] = {
-#if SMALL_TEST
-/* blocksz, max keys before switching size */
- /* { 32, 40 }, */
- { 128, 0 },
-#else
- { 24, 40 },
- { 2048, 2048 },
- { 16384, 0 },
-
-#endif
-#ifdef OLDVALUES
- { 24, 40 },
- { 128, 256 },
- { 512, 1024 },
- { 2048, 4096 },
- { 8192,16384 },
- { 32768, 0 },
-
-#endif
-/* assume about 2 bytes per pointer, when compressed. The head uses */
-/* 16 bytes, and other blocks use 8 for header info... If you want 3 */
-/* blocks of 32 bytes, say max 16+24+24 = 64 keys */
-
- };
- ISAMH_M m = (ISAMH_M) xmalloc (sizeof(*m));
- m->filecat = def_cat;
-
- m->code_start = NULL;
- m->code_item = NULL;
- m->code_stop = NULL;
- m->code_reset = NULL;
-
- m->compare_item = NULL;
-
- m->debug = 1;
-
- m->max_blocks_mem = 10;
-
- return m;
-}
-
-
-
-ISAMH isamh_open (BFiles bfs, const char *name, int writeflag, ISAMH_M method)
-{
- ISAMH is;
- ISAMH_filecat filecat;
- int i = 0;
- int max_buf_size = 0;
-
- is = (ISAMH) xmalloc (sizeof(*is));
-
- is->method = (ISAMH_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 maxkeys");
- do
- {
- if (is->method->debug)
- logf (LOG_LOG, "isc:%6d %6d",
- filecat[i].bsize, filecat[i].mblocks);
- if (max_buf_size < filecat[i].bsize)
- max_buf_size = filecat[i].bsize;
- } while (filecat[i++].mblocks);
- is->no_files = i;
- is->max_cat = --i;
-#ifdef SKIPTHIS
- /* 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;
-#endif
-
- if (is->method->debug)
- logf (LOG_LOG, "isc: max_buf_size %d", max_buf_size);
-
- assert (is->no_files > 0);
- is->files = (ISAMH_file) xmalloc (sizeof(*is->files)*is->no_files);
- if (writeflag)
- {
-#ifdef SKIPTHIS
- is->merge_buf = (char *) xmalloc (max_buf_size+256);
- memset (is->merge_buf, 0, max_buf_size+256);
-#else
- is->startblock = (char *) xmalloc (max_buf_size+256);
- memset (is->startblock, 0, max_buf_size+256);
- is->lastblock = (char *) xmalloc (max_buf_size+256);
- memset (is->lastblock, 0, max_buf_size+256);
- /* The spare 256 bytes should not be needed! */
-#endif
- }
- else
- is->startblock = is->lastblock = 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 (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(ISAMH_head),
- &is->files[i].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 isamh_block_used (ISAMH is, int type)
-{
- if (type < 0 || type >= is->no_files)
- return -1;
- return is->files[type].head.lastblock-1;
-}
-
-int isamh_block_size (ISAMH is, int type)
-{
- ISAMH_filecat filecat = is->method->filecat;
- if (type < 0 || type >= is->no_files)
- return -1;
- return filecat[type].bsize;
-}
-
-int isamh_close (ISAMH 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++)
- {
- 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(ISAMH_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->startblock);
- xfree (is->lastblock);
- xfree (is->method);
- xfree (is);
- return 0;
-}
-
-int isamh_read_block (ISAMH is, int cat, int pos, char *dst)
-{
- ++(is->files[cat].no_reads);
- return bf_read (is->files[cat].bf, pos, 0, 0, dst);
-}
-
-int isamh_write_block (ISAMH is, int cat, int pos, char *src)
-{
- ++(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 isamh_write_dblock (ISAMH is, int cat, int pos, char *src,
- int nextpos, int offset)
-{
- ISAMH_BLOCK_SIZE size = offset + ISAMH_BLOCK_OFFSET_N;
- if (is->method->debug > 2)
- logf (LOG_LOG, "isc: write_dblock. size=%d nextpos=%d",
- (int) size, nextpos);
- src -= ISAMH_BLOCK_OFFSET_N;
- memcpy (src, &nextpos, sizeof(int));
- memcpy (src + sizeof(int), &size, sizeof(size));
- return isamh_write_block (is, cat, pos, src);
-}
-
-#if ISAMH_FREELIST_CHUNK
-static void flush_block (ISAMH 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 (ISAMH 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 (ISAMH 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 (ISAMH is, int cat)
-{
- char *abuf = is->files[cat].alloc_buf;
- xfree (abuf);
-}
-
-static int alloc_block (ISAMH 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);
- memcpy (&is->files[cat].head.freelist, buf, sizeof(int));
- }
- else
- block = (is->files[cat].head.lastblock)++;
- return block;
-}
-
-static void release_block (ISAMH 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
-
-int isamh_alloc_block (ISAMH is, int cat)
-{
- int block = 0;
-
- if (is->files[cat].fc_list)
- {
- int j, nb;
- for (j = 0; j < is->files[cat].fc_max; j++)
- if ((nb = is->files[cat].fc_list[j]) && (!block || nb < block))
- {
- is->files[cat].fc_list[j] = 0;
- block = nb;
- break;
- }
- }
- 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;
-}
-
-void isamh_release_block (ISAMH is, int cat, int pos)
-{
- if (is->method->debug > 3)
- logf (LOG_LOG, "isc: release_block in cat %d: %d", cat, pos);
- if (is->files[cat].fc_list)
- {
- int j;
- for (j = 0; j<is->files[cat].fc_max; j++)
- if (!is->files[cat].fc_list[j])
- {
- is->files[cat].fc_list[j] = pos;
- return;
- }
- }
- release_block (is, cat, pos);
-}
-
-static void init_fc (ISAMH is, int cat)
-{
- 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;
-}
-
-static void release_fc (ISAMH is, int cat)
-{
- int b, j = is->files[cat].fc_max;
-
- while (--j >= 0)
- if ((b = is->files[cat].fc_list[j]))
- {
- release_block (is, cat, b);
- is->files[cat].fc_list[j] = 0;
- }
-}
-
-void isamh_pp_close (ISAMH_PP pp)
-{
- ISAMH is = pp->is;
-
- (*is->method->code_stop)(ISAMH_DECODE, pp->decodeClientData);
- xfree (pp->buf);
- xfree (pp);
-}
-
-ISAMH_PP isamh_pp_open (ISAMH is, ISAMH_P ipos)
-{
- ISAMH_PP pp = (ISAMH_PP) xmalloc (sizeof(*pp));
- char *src;
-
- pp->cat = isamh_type(ipos);
- pp->pos = isamh_block(ipos);
-
- src = pp->buf = (char *) xmalloc (is->method->filecat[pp->cat].bsize);
-
- pp->next = 0;
- pp->size = 0;
- pp->offset = 0;
- pp->is = is;
- pp->decodeClientData = (*is->method->code_start)(ISAMH_DECODE);
- pp->deleteFlag = 0;
- pp->numKeys = 0;
- pp->lastblock=0;
-
- if (pp->pos)
- {
- src = pp->buf;
- isamh_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);
- memcpy (&pp->lastblock, src, sizeof(pp->lastblock));
- src += sizeof(pp->lastblock);
- assert (pp->next != pp->pos);
- pp->offset = src - pp->buf;
- assert (pp->offset == ISAMH_BLOCK_OFFSET_1);
- if (is->method->debug > 2)
- logf (LOG_LOG, "isamh_pp_open sz=%d c=%d p=%d n=%d",
- pp->size, pp->cat, pp->pos, isamh_block(pp->next));
- }
- return pp;
-}
-
-
-
-void isamh_buildfirstblock(ISAMH_PP pp){
- char *dst=pp->buf;
- assert(pp->buf);
- assert(pp->next != pp->pos);
- memcpy(dst, &pp->next, sizeof(pp->next) );
- dst += sizeof(pp->next);
- memcpy(dst, &pp->size,sizeof(pp->size));
- dst += sizeof(pp->size);
- memcpy(dst, &pp->numKeys, sizeof(pp->numKeys));
- dst += sizeof(pp->numKeys);
- memcpy(dst, &pp->lastblock, sizeof(pp->lastblock));
- dst += sizeof(pp->lastblock);
- assert (dst - pp->buf == ISAMH_BLOCK_OFFSET_1);
- if (pp->is->method->debug > 2)
- logf (LOG_LOG, "isamh: first: sz=%d p=%d/%d>%d/%d>%d/%d nk=%d",
- pp->size,
- pp->pos, pp->cat,
- isamh_block(pp->next), isamh_type(pp->next),
- isamh_block(pp->lastblock), isamh_type(pp->lastblock),
- pp->numKeys);
-}
-
-void isamh_buildlaterblock(ISAMH_PP pp){
- char *dst=pp->buf;
- assert(pp->buf);
- assert(pp->next != isamh_addr(pp->pos,pp->cat));
- memcpy(dst, &pp->next, sizeof(pp->next) );
- dst += sizeof(pp->next);
- memcpy(dst, &pp->size,sizeof(pp->size));
- dst += sizeof(pp->size);
- assert (dst - pp->buf == ISAMH_BLOCK_OFFSET_N);
- if (pp->is->method->debug > 2)
- logf (LOG_LOG, "isamh: l8r: sz=%d p=%d/%d>%d/%d",
- pp->size,
- pp->pos, pp->cat,
- isamh_block(pp->next), isamh_type(pp->next) );
-}
-
-
-
-/* returns non-zero if item could be read; 0 otherwise */
-int isamh_pp_read (ISAMH_PP pp, void *buf)
-{
- return isamh_read_item (pp, (char **) &buf);
-}
-
-/* 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 isamh_read_item (ISAMH_PP pp, char **dst)
-{
- ISAMH is = pp->is;
- char *src = pp->buf + pp->offset;
- int newcat;
-
- 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 */
- newcat = isamh_type(pp->next);
- if (pp->cat != newcat ) {
- pp->buf = xrealloc(pp->buf, is->method->filecat[newcat].bsize);
- }
- pp->pos = isamh_block(pp->next);
- pp->cat = isamh_type(pp->next);
-
- src = pp->buf;
- /* read block and save 'next' and 'size' entry */
- isamh_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 == ISAMH_BLOCK_OFFSET_N);
- assert (pp->next != isamh_addr(pp->pos,pp->cat));
- if (pp->deleteFlag)
- isamh_release_block (is, pp->cat, pp->pos);
- (*is->method->code_reset)(pp->decodeClientData);
- (*is->method->code_item)(ISAMH_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)(ISAMH_DECODE, pp->decodeClientData, dst, &src);
- pp->offset = src - pp->buf;
- return 1;
-}
-
-int isamh_pp_num (ISAMH_PP pp)
-{
- return pp->numKeys;
-}
-
-static char *hexdump(unsigned char *p, int len, char *buff) {
- static char localbuff[128];
- char bytebuff[8];
- if (!buff) buff=localbuff;
- *buff='\0';
- while (len--) {
- sprintf(bytebuff,"%02x",*p);
- p++;
- strcat(buff,bytebuff);
- if (len) strcat(buff," ");
- }
- return buff;
-}
-
-
-void isamh_pp_dump (ISAMH is, ISAMH_P ipos)
-{
- ISAMH_PP pp;
- ISAMH_P oldaddr=0;
- struct it_key key;
- int i,n;
- int occur =0;
- int oldoffs;
- char hexbuff[64];
-
- logf(LOG_LOG,"dumping isamh block %d (%d:%d)",
- (int)ipos, isamh_type(ipos), isamh_block(ipos) );
- pp=isamh_pp_open(is,ipos);
- logf(LOG_LOG,"numKeys=%d, last=%d (%d:%d) ofs=%d ",
- pp->numKeys,
- pp->lastblock,
- isamh_type(pp->lastblock), isamh_block(pp->lastblock),
- pp->offset);
- oldoffs= pp->offset;
- while(isamh_pp_read(pp, &key))
- {
- if (oldaddr != isamh_addr(pp->pos,pp->cat) )
- {
- oldaddr = isamh_addr(pp->pos,pp->cat);
- logf(LOG_LOG,"block %d (%d:%d) sz=%d nx=%d (%d:%d) ofs=%d",
- isamh_addr(pp->pos,pp->cat),
- pp->cat, pp->pos, pp->size,
- pp->next, isamh_type(pp->next), isamh_block(pp->next),
- pp->offset);
- i=0;
- while (i<pp->size) {
- n=pp->size-i;
- if (n>8) n=8;
- logf(LOG_LOG," %05x: %s",i,hexdump(pp->buf+i,n,hexbuff));
- i+=n;
- }
- if (oldoffs > ISAMH_BLOCK_OFFSET_N)
- oldoffs=ISAMH_BLOCK_OFFSET_N;
- } /* new block */
- occur++;
- logf (LOG_LOG," got %d:%d=%x:%x from %s at %d=%x",
- key.sysno, key.seqno,
- key.sysno, key.seqno,
- hexdump(pp->buf+oldoffs, pp->offset-oldoffs, hexbuff),
- oldoffs, oldoffs);
- oldoffs = pp->offset;
- }
- isamh_pp_close(pp);
-} /* dump */
-
-/*
- * $Log: isamh.c,v $
- * Revision 1.6 1999-07-13 15:24:50 heikki
- * Removed the one-block append, it had a serious flaw.
- *
- * Revision 1.5 1999/07/08 14:23:27 heikki
- * Fixed a bug in isamh_pp_read and cleaned up a bit
- *
- * Revision 1.4 1999/07/07 09:36:04 heikki
- * Fixed an assertion in isamh
- *
- * Revision 1.2 1999/07/06 09:37:05 heikki
- * Working on isamh - not ready yet.
- *
- * Revision 1.1 1999/06/30 15:04:54 heikki
- * Copied from isamc.c, slowly starting to simplify...
- *
- */
\ No newline at end of file
projects / idzebra-moved-to-github.git / commitdiff