-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;
-}
-
-#ifndef NEW_ISAM_D
-/* The next many lines are the old ISAM_D. Works, but not optimal */
-
-static int separateDiffBlock(ISAMD_PP pp)
-{
- int limit = sizeof(int) + 8;
- if (pp->next)
- return 1; /* multi-block chains always have a separate diff block */
- return ( pp->size + limit >= pp->is->method->filecat[pp->cat].bsize);
- /* make sure there is at least room for the length and one diff. if not, */
- /* it goes to a separate block. Assumes max diff is 8 bytes. Not */
- /* unreaalistic in large data sets, where first sysno may be very large, */
- /* and even the first seqno may be quite something. */
-
- /* todo: Make the limit adjustable in the filecat table ! */
-}
-
-
-/**************************************************************
- * Reading
- **************************************************************/
-
-static void getDiffInfo(ISAMD_PP pp, int diffidx)
-{ /* builds the diff info structures from a diffblock */
- int maxinfos = pp->is->method->filecat[pp->cat].bsize / 5 +2;
- /* Each diff takes at least 5 bytes. Probably more, but this is safe */
- int i=1; /* [0] is used for the main data */
- int diffsz= maxinfos * sizeof(struct ISAMD_DIFF_s);
-
- pp->diffinfo = xmalloc( diffsz );
- memset(pp->diffinfo,'\0',diffsz);
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_getDiffInfo: %d (%d:%d), ix=%d mx=%d",
- isamd_addr(pp->pos, pp->cat), pp->cat, pp->pos, diffidx,maxinfos);
- assert(pp->diffbuf);
-
- while (i<maxinfos)
- {
- if ( diffidx+sizeof(int) > pp->is->method->filecat[pp->cat].bsize )
- {
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_getDiffInfo:Near end (no room for len) at ix=%d n=%d",
- diffidx, i);
- return; /* whole block done */
- }
- memcpy( &pp->diffinfo[i].maxidx, &pp->diffbuf[diffidx], sizeof(int) );
-
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_getDiffInfo: max=%d ix=%d dbuf=%p",
- pp->diffinfo[i].maxidx, diffidx, pp->diffbuf);
-
- if ( (pp->is->method->debug > 0) &&
- (pp->diffinfo[i].maxidx > pp->is->method->filecat[pp->cat].bsize) )
- { /* bug-hunting, this fails on some long runs that log too much */
- logf(LOG_LOG,"Bad MaxIx!!! %s:%d: diffidx=%d",
- __FILE__,__LINE__, diffidx);
- logf(LOG_LOG,"i=%d maxix=%d bsz=%d", i, pp->diffinfo[i].maxidx,
- pp->is->method->filecat[pp->cat].bsize);
- logf(LOG_LOG,"pp=%d=%d:%d pp->nx=%d=%d:%d",
- isamd_addr(pp->pos,pp->cat), pp->pos, pp->cat,
- pp->next, isamd_type(pp->next), isamd_block(pp->next) );
- }
- assert(pp->diffinfo[i].maxidx <= pp->is->method->filecat[pp->cat].bsize+1);
-
- if (0==pp->diffinfo[i].maxidx)
- {
- if (pp->is->method->debug > 5) //!!! 4
- logf(LOG_LOG,"isamd_getDiffInfo:End mark at ix=%d n=%d",
- diffidx, i);
- return; /* end marker */
- }
- diffidx += sizeof(int);
- pp->diffinfo[i].decodeData = (*pp->is->method->code_start)(ISAMD_DECODE);
- pp->diffinfo[i].diffidx = diffidx;
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_getDiff[%d]:%d-%d %s",
- i,diffidx-sizeof(int),pp->diffinfo[i].maxidx,
- hexdump((char *)&pp->diffbuf[diffidx-4],8,0) );
- diffidx=pp->diffinfo[i].maxidx;
- if ( diffidx > pp->is->method->filecat[pp->cat].bsize )
- return; /* whole block done */
- ++i;
- }
- assert (!"too many diff sequences in the block");
-}
-
-static void loadDiffs(ISAMD_PP pp)
-{ /* assumes pp is a firstblock! */
- int diffidx;
- int diffaddr;
- if (0==pp->diffs)
- return; /* no diffs to talk about */
- if (pp->diffs & 1 )
- { /* separate diff block, load it */
- pp->diffbuf= xmalloc( pp->is->method->filecat[pp->cat].bsize);
- diffaddr=isamd_addr(pp->diffs/2, pp->cat);
- isamd_read_block (pp->is, isamd_type(diffaddr),
- isamd_block(diffaddr), pp->diffbuf );
- diffidx= ISAMD_BLOCK_OFFSET_N;
- if (pp->is->method->debug > 4)
- logf(LOG_LOG,"isamd_LoadDiffs: loaded block %d=%d:%d, d=%d ix=%d",
- diffaddr, isamd_type(diffaddr),isamd_block(diffaddr),
- pp->diffs,diffidx);
- }
- else
- { /* integrated block, just set the pointers */
- pp->diffbuf = pp->buf;
- diffidx = pp->size; /* size is the beginning of diffs, diffidx the end*/
- if (pp->is->method->debug > 4)
- logf(LOG_LOG,"isamd_LoadDiffs: within %d=%d:%d, d=%d ix=%d ",
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos, pp->diffs, diffidx);
- }
- getDiffInfo(pp,diffidx);
-} /* loadDiffs */
-
-
-void isamd_free_diffs(ISAMD_PP pp)
-{
- int i;
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_free_diffs: pp=%p di=%p", pp, pp->diffinfo);
- if (!pp->diffinfo)
- return;
- for (i=1;pp->diffinfo[i].decodeData;i++)
- {
- if (pp->is->method->debug > 8)
- logf(LOG_LOG,"isamd_free_diffs [%d]=%p",i,
- pp->diffinfo[i].decodeData);
- (*pp->is->method->code_stop)(ISAMD_DECODE,pp->diffinfo[i].decodeData);
- }
- xfree(pp->diffinfo);
- if (pp->diffbuf != pp->buf)
- xfree (pp->diffbuf);
-} /* isamd_free_diffs */
-
-
-/* Reads one item and corrects for the diffs, if any */
-/* return 1 for ok, 0 for eof */
-int isamd_read_item (ISAMD_PP pp, char **dst)
-{
- char *keyptr;
- char *codeptr;
- char *codestart;
- int winner=0; /* which diff holds the day */
- int i; /* looping diffs */
- int cmp;
- int retry=1;
- if (pp->diffs==0) /* no diffs, just read the thing */
- return isamd_read_main_item(pp,dst);
-
- if (!pp->diffinfo)
- loadDiffs(pp);
- while (retry)
- {
- retry=0;
- if (0==pp->diffinfo[0].key.sysno)
- { /* 0 is special case, main data. */
- keyptr=(char*) &(pp->diffinfo[0].key);
- pp->diffinfo[0].mode = ! isamd_read_main_item(pp,&keyptr);
- if (pp->is->method->debug > 7)
- logf(LOG_LOG,"isamd_read_item: read main %d.%d (%x.%x)",
- pp->diffinfo[0].key.sysno, pp->diffinfo[0].key.seqno,
- pp->diffinfo[0].key.sysno, pp->diffinfo[0].key.seqno);
- } /* get main data */
- winner = 0;
- for (i=1; (!retry) && (pp->diffinfo[i].decodeData); i++)
- {
- if (pp->is->method->debug > 8)
- logf(LOG_LOG,"isamd_read_item: considering d%d %d.%d ix=%d mx=%d",
- i, pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno,
- pp->diffinfo[i].diffidx, pp->diffinfo[i].maxidx);
-
- if ( (0==pp->diffinfo[i].key.sysno) &&
- (pp->diffinfo[i].diffidx < pp->diffinfo[i].maxidx))
- {/* read a new one, if possible */
- codeptr= codestart = &(pp->diffbuf[pp->diffinfo[i].diffidx]);
- keyptr=(char *)&(pp->diffinfo[i].key);
- (*pp->is->method->code_item)(ISAMD_DECODE,
- pp->diffinfo[i].decodeData, &keyptr, &codeptr);
- pp->diffinfo[i].diffidx += codeptr-codestart;
- pp->diffinfo[i].mode = pp->diffinfo[i].key.seqno & 1;
- pp->diffinfo[i].key.seqno = pp->diffinfo[i].key.seqno >>1 ;
- if (pp->is->method->debug > 7)
- logf(LOG_LOG,"isamd_read_item: read diff[%d] %d.%d (%x.%x)",i,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno);
- }
- if ( 0!= pp->diffinfo[i].key.sysno)
- { /* got a key, compare */
- cmp=key_compare(&pp->diffinfo[i].key, &pp->diffinfo[winner].key);
- if (0==pp->diffinfo[winner].key.sysno)
- cmp=-1; /* end of main sequence, take all diffs */
- if (cmp<0)
- {
- if (pp->is->method->debug > 8)
- logf(LOG_LOG,"isamd_read_item: ins %d<%d %d.%d (%x.%x) < %d.%d (%x.%x)",
- i, winner,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno,
- pp->diffinfo[winner].key.sysno, pp->diffinfo[winner].key.seqno,
- pp->diffinfo[winner].key.sysno, pp->diffinfo[winner].key.seqno);
- if (pp->diffinfo[i].mode) /* insert diff, should always be */
- winner = i;
- else
- assert(!"delete diff for nonexisting item");
- /* is an assert too steep here? Not really.*/
- } /* earlier key */
- else if (cmp==0)
- {
- if (!pp->diffinfo[i].mode) /* delete diff. should always be */
- {
- if (pp->is->method->debug > 8)
- logf(LOG_LOG,"isamd_read_item: del %d at%d %d.%d (%x.%x)",
- i, winner,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno);
- pp->diffinfo[winner].key.sysno=0; /* delete it */
- }
- else
- if (pp->is->method->debug > 2)
- logf(LOG_LOG,"isamd_read_item: duplicate ins %d at%d %d.%d (%x.%x)",
- i, winner,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno,
- pp->diffinfo[i].key.sysno, pp->diffinfo[i].key.seqno);
- /* skip the insert, since we already have it in the base */
- /* Should we fail an assertion here??? */
- pp->diffinfo[i].key.sysno=0; /* done with the delete */
- retry=1; /* start all over again */
- } /* matching key */
- /* else it is a later key, its turn will come */
- } /* got a key */
- } /* for each diff */
- } /* not retry */
-
- if ( pp->diffinfo[winner].key.sysno)
- {
- if (pp->is->method->debug > 7)
- logf(LOG_LOG,"isamd_read_item: got %d %d.%d (%x.%x)",
- winner,
- pp->diffinfo[winner].key.sysno, pp->diffinfo[winner].key.seqno,
- pp->diffinfo[winner].key.sysno, pp->diffinfo[winner].key.seqno);
- memcpy(*dst, &pp->diffinfo[winner].key, sizeof(struct it_key) );
- *dst += sizeof(struct it_key);
- pp->diffinfo[winner].key.sysno=0; /* used that one up */
- cmp= 1;
- }
- else
- {
- if (pp->is->method->debug > 7)
- logf(LOG_LOG,"isamd_read_item: eof w=%d %d.%d (%x.%x)",
- winner,
- pp->diffinfo[winner].key.sysno, pp->diffinfo[winner].key.seqno,
- pp->diffinfo[winner].key.sysno, pp->diffinfo[winner].key.seqno);
- assert(winner==0); /* if nothing found, nothing comes from a diff */
- cmp= 0; /* eof */
- }
- return cmp;
-
-} /* isamd_read_item */
-
-/*****************************************************************
- * Support routines
- *****************************************************************/
-
-static void isamd_reduceblock(ISAMD_PP pp)
-/* takes a large block, and reduces its category if possible */
-/* Presumably the first block in an isam-list */
-{
- if (pp->pos)
- return; /* existing block, do not touch */
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_reduce: start p=%d c=%d sz=%d",
- pp->pos, pp->cat, pp->size);
- while ( ( pp->cat > 0 ) && (!pp->next) &&
- (pp->offset < pp->is->method->filecat[pp->cat-1].bsize ) )
- pp->cat--;
- pp->pos = isamd_alloc_block(pp->is, pp->cat);
- if (pp->is->method->debug > 5)
- logf(LOG_LOG,"isamd_reduce: got p=%d c=%d sz=%d",
- pp->pos, pp->cat, pp->size);
-} /* reduceblock */
-
-
-
-
-static int save_first_pp ( ISAMD_PP firstpp)
-{
- isamd_reduceblock(firstpp);
- isamd_buildfirstblock(firstpp);
- isamd_write_block(firstpp->is,firstpp->cat,firstpp->pos,firstpp->buf);
- return isamd_addr(firstpp->pos,firstpp->cat);
-}
-
-static void save_last_pp (ISAMD_PP pp)
-{
- pp->next = 0;/* just to be sure */
- isamd_buildlaterblock(pp);
- isamd_write_block(pp->is,pp->cat,pp->pos,pp->buf);
-}
-
-
-static int save_both_pps (ISAMD_PP firstpp, ISAMD_PP pp)
-{
- /* order of things: Better to save firstpp first, if there are just two */
- /* blocks, but last if there are blocks in between, as these have already */
- /* been saved... optimise later (that's why this is in its own func...*/
- int retval = save_first_pp(firstpp);
- if (firstpp!=pp){
- save_last_pp(pp);
- isamd_pp_close(pp);
- }
- isamd_pp_close(firstpp);
- return retval;
-} /* save_both_pps */
-
-static ISAMD_PP read_diff_block(ISAMD_PP firstpp, int* p_diffidx)
-{ /* reads the diff block (if separate) and sets diffidx right */
- ISAMD_PP pp=firstpp;
- int i;
- int diffidx;
- if (pp->diffs == 0)
- { /* no diffs yet, create room for them */
- if (separateDiffBlock(firstpp))
- { /* create a new block */
- pp=isamd_pp_open(pp->is,isamd_addr(0,firstpp->cat));
- pp->pos = isamd_alloc_block(pp->is, pp->cat);
- firstpp->diffs = pp->pos*2 +1;
- diffidx = pp->size = pp->offset = ISAMD_BLOCK_OFFSET_N;
- if (pp->is->method->debug >5)
- logf(LOG_LOG,"isamd_appd: alloc diff (d=%d) %d=%d:%d ix=%d",
- firstpp->diffs,
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- diffidx);
- }
- else
- { /* prepare to append diffs in head */
- diffidx = pp->size;
- pp->diffs = diffidx *2 +0;
- i=diffidx; /* make an end marker */
- while ( ( i < pp->is->method->filecat[pp->cat].bsize) &&
- ( i <= diffidx + sizeof(int)))
- pp->buf[i++]='\0';
- if (pp->is->method->debug >5)
- logf(LOG_LOG,"isamd_appd: set up diffhead (d=%d) %d=%d:%d ix=%d",
- firstpp->diffs,
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- diffidx);
- }
- } /* new */
- else
- { /* existing diffs */
- if (pp->diffs & 1)
- { /* diffs in a separate block, load it */
- pp=isamd_pp_open(pp->is, isamd_addr(firstpp->diffs/2,pp->cat));
- diffidx = pp->offset= pp->size;
- if (pp->is->method->debug >5)
- logf(LOG_LOG,"isamd_appd: loaded diff (d=%d) %d=%d:%d ix=%d",
- firstpp->diffs,
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- diffidx);
- }
- else
- { /* diffs within the nead */
- diffidx= pp->diffs/2;
- if (pp->is->method->debug >5)
- logf(LOG_LOG,"isamd_appd: diffs in head d=%d %d=%d:%d ix=%d sz=%d",
- pp->diffs,
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- diffidx, pp->size);
- }
- } /* diffs exist already */
- *p_diffidx = diffidx;
- return pp;
-} /* read_diff_block */
-
-
-
-
-/*******************************************************************
- * Building main blocks (no diffs)
- *******************************************************************/
-
-
-
-static ISAMD_PP get_new_main_block( ISAMD_PP firstpp, ISAMD_PP pp)
-{ /* allocates a new block for the main data, and links it in */
- int newblock;
- if (firstpp==pp)
- { /* special case: it was the first block. Save much later */
- if (0==firstpp->pos)
- { /* firstpp not allocated yet, do so now, */
- /* to keep blocks in order. Don't save yet, though */
- firstpp->pos = isamd_alloc_block(pp->is, firstpp->cat);
- }
- newblock = isamd_alloc_block(pp->is, firstpp->cat);
- firstpp->next = isamd_addr(newblock,firstpp->cat);
- /* keep the largest category */
- pp=isamd_pp_open(pp->is,isamd_addr(0,firstpp->cat));/*don't load*/
- pp->pos=newblock;
- pp->size = pp->offset = ISAMD_BLOCK_OFFSET_N;
- pp->next=0;
- if (pp->is->method->debug >3)
- logf(LOG_LOG,"isamd_g_mainblk: Alloc2 f=%d=%d:%d n=%d=%d:%d",
- isamd_addr(firstpp->pos,firstpp->cat),
- firstpp->cat, firstpp->pos,
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos );
- }
- else
- { /* it was not the first block */
- newblock = isamd_alloc_block(pp->is, firstpp->cat);
- pp->next = isamd_addr(newblock,firstpp->cat);
- if (pp->is->method->debug >3)
- logf(LOG_LOG,"isamd_build: Alloc1 after p=%d=%d:%d->%d=%d:%d",
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- isamd_addr(newblock,pp->cat), pp->cat, newblock );
- isamd_buildlaterblock(pp);
- isamd_write_block(pp->is,pp->cat,pp->pos,pp->buf);
- pp->size = pp->offset = ISAMD_BLOCK_OFFSET_N;
- pp->next=0;
- pp->cat = firstpp->cat;
- pp->pos = newblock;
- pp->cat = firstpp->cat; /* is already, never mind */
- }
- return pp;
-} /* get_new_main_block */
-
-
-static ISAMD_PP append_main_item(ISAMD_PP firstpp,
- ISAMD_PP pp,
- struct it_key *i_key,
- void *encoder_data)
-{ /* appends one item in the main data block, allocates new if needed */
- char *i_item= (char *) i_key; /* same as char */
- char *i_ptr=i_item;
- char codebuff[128];
- char *c_ptr = codebuff;
- int codelen;
- char hexbuff[64];
-
- int maxsize = pp->is->method->filecat[pp->is->max_cat].bsize;
-
- c_ptr=codebuff;
- i_ptr=i_item;
- (*pp->is->method->code_item)(ISAMD_ENCODE, encoder_data, &c_ptr, &i_ptr);
- codelen = c_ptr - codebuff;
- assert ( (codelen<128) && (codelen>0));
- if (pp->is->method->debug >7)
- logf(LOG_LOG,"isamd:build: coded into %s (nk=%d)",
- hexdump(codebuff, c_ptr-codebuff,hexbuff), firstpp->numKeys+1);
-
- if (pp->offset + codelen > maxsize )
- { /* oops, block full - get a new one */
- pp = get_new_main_block( firstpp, pp );
- /* reset encoging and code again */
- (*pp->is->method->code_reset)(encoder_data);
- c_ptr=codebuff;
- i_ptr=i_item;
- (*pp->is->method->code_item)(ISAMD_ENCODE, encoder_data, &c_ptr, &i_ptr);
- codelen = c_ptr - codebuff;
- assert ( (codelen<128) && (codelen>0));
- if (pp->is->method->debug >7)
- logf(LOG_LOG,"isamd:build: recoded into %s (nk=%d)",
- hexdump(codebuff, c_ptr-codebuff,hexbuff), firstpp->numKeys+1);
- } /* block full */
-
- /* write the data into pp, now we must have room */
- memcpy(&(pp->buf[pp->offset]),codebuff,codelen);
- pp->offset += codelen;
- pp->size += codelen;
- firstpp->numKeys++;
- /* clear the next 4 bytes in block, to avoid confusions with diff lens */
- /* dirty, it should not be done here, but something slips somewhere, and */
- /* I hope this fixes it... - Heikki */
- codelen = pp->offset;
- while ( (codelen < maxsize ) && (codelen <= pp->offset+4) )
- pp->buf[codelen++] = '\0';
- return pp;
-} /* append_main_item */
-
-
-static int isamd_build_first_block(ISAMD is, ISAMD_I data)
-{
- struct it_key i_key; /* input key */
- char *i_item= (char *) &i_key; /* same as char */
- char *i_ptr=i_item;
- int i_more =1;
- int i_mode; /* 0 for delete, 1 for insert */
-
- ISAMD_PP firstpp;
- ISAMD_PP pp;
- void *encoder_data;
-
- char hexbuff[64];
-
- ++(is->files[0].no_fbuilds);
-
- firstpp=pp=isamd_pp_open(is, isamd_addr(0,is->max_cat));
- firstpp->size = firstpp->offset = ISAMD_BLOCK_OFFSET_1;
-
- encoder_data=(*is->method->code_start)(ISAMD_ENCODE);
-
- if (is->method->debug >2)
- logf(LOG_LOG,"isamd_bld start: p=%d=%d:%d sz=%d maxsz=%d ",
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- pp->size, pp->is->method->filecat[pp->is->max_cat].bsize);
-
- /* read first input */
- i_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_ptr, &i_mode);
- if (i_more)
- assert( i_ptr-i_item == sizeof(i_key) );
-
- if (pp->is->method->debug >7)
- logf(LOG_LOG,"isamd: build_fi start: m=%d %s",
- i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
-
- while (i_more)
- {
- if (i_mode!=0)
- { /* ignore deletes here, should not happen */
- pp= append_main_item(firstpp, pp, &i_key, encoder_data);
- } /* not delete */
-
- /* (try to) read the next item */
- i_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_ptr, &i_mode);
-
- if ( (i_more) && (pp->is->method->debug >7) )
- logf(LOG_LOG,"isamd: build_fi read: m=%d %s",
- i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
-
- } /* i_more */
- (*is->method->code_stop)(ISAMD_ENCODE, encoder_data);
-
- return save_both_pps( firstpp, pp );
-
-} /* build_first_block */
-
-
-/***************************************************************
- * Merging diffs
- ***************************************************************/
-
-
-static int merge ( ISAMD_PP *p_firstpp, /* first pp of the chain */
- ISAMD_PP *p_pp, /* diff block */
- struct it_key *p_key ) /* not used yet */
-{
- ISAMD_PP readpp = *p_firstpp;
- int diffidx;
- int killblk=0;
- struct it_key r_key;
- char * r_ptr;
- int r_more = 1;
- ISAMD_PP firstpp; /* the new first, the one we write into */
- ISAMD_PP pp;
- void *encoder_data;
-
- ++(readpp->is->files[0].no_merges);
-
- /* set up diffs as they should be for reading */
- readpp->offset= ISAMD_BLOCK_OFFSET_1;
-
- if ( (*p_firstpp)->diffs & 1 )
- { /* separate diff block in *p_pp */
- killblk = readpp->diffs/2;
- diffidx /*size*/ = readpp->is->method->filecat[readpp->cat].bsize;
- readpp->diffbuf= xmalloc( diffidx); /* copy diffs to where read wants*/
- memcpy( readpp->diffbuf, &((*p_pp)->buf[0]), diffidx);
- diffidx = ISAMD_BLOCK_OFFSET_N;
- if (readpp->is->method->debug >2)
- {
- logf(LOG_LOG,"isamd_merge:separate diffs at ix=%d",
- diffidx);
- logf(LOG_LOG,"isamd_merge: dbuf=%p (from %p) pp=%p",
- readpp->diffbuf, &((*p_pp)->buf[0]), (*p_pp) );
- }
- }
- else
- { /* integrated diffs */
- assert ( *p_pp == *p_firstpp ); /* can only be in the first block */
- diffidx=readpp->size;
- readpp->diffs = diffidx*2+0;
- readpp->diffbuf=readpp->buf;
- if (readpp->is->method->debug >2)
- logf(LOG_LOG,"isamd_merge:local diffs at %d: %s",
- diffidx,hexdump(&(readpp->diffbuf[diffidx]),8,0));
- }
-
- getDiffInfo(readpp,diffidx);
- if (readpp->is->method->debug >8)
- logf(LOG_LOG,"isamd_merge: diffinfo=%p", readpp->diffinfo);
-
-
- if (killblk)
- { /* we had a separate diff block, release it, we have copied the data */
- isamd_release_block(readpp->is, readpp->cat, killblk);
- isamd_pp_close (*p_pp);
- if (readpp->is->method->debug >3)
- logf(LOG_LOG,"isamd_merge: released diff block %d=%d:%d",
- isamd_addr(killblk,readpp->cat), readpp->cat, killblk );
- }
-
-
- /* release our data block. Do before reading, when pos is stable ! */
- killblk=readpp->pos;
- assert(killblk);
- isamd_release_block(readpp->is, readpp->cat, killblk);
- if (readpp->is->method->debug >3)
- logf(LOG_LOG,"isamd_merge: released old firstblock %d (%d:%d)",
- isamd_addr(killblk,readpp->cat), readpp->cat, killblk );
-
- r_ptr= (char *) &r_key;
- r_more = isamd_read_item( readpp, &r_ptr);
- if (!r_more)
- { /* oops, all data has been deleted! what to do??? */
- /* never mind, we have at least one more delta to add to the block */
- /* pray that is not a delete as well... */
- r_key.sysno = 0;
- r_key.seqno = 0;
- if (readpp->is->method->debug >3)
- logf(LOG_LOG,"isamd_merge:all data has been deleted (nk=%d) ",
- readpp->numKeys);
- assert (readpp->numKeys == 0);
- }
-
-
- /* set up the new blocks for simple writing */
- firstpp=pp=isamd_pp_open(readpp->is,isamd_addr(0, readpp->is->max_cat));
- firstpp->size = firstpp->offset = ISAMD_BLOCK_OFFSET_1;
- encoder_data = (*pp->is->method->code_start)(ISAMD_ENCODE);
-
- while (r_more)
- {
- if (readpp->is->method->debug >6)
- logf(LOG_LOG,"isamd_merge: got key %d.%d",
- r_key.sysno, r_key.seqno );
- pp= append_main_item(firstpp, pp, &r_key, encoder_data);
-
- if ( (readpp->pos != killblk ) && (0!=readpp->pos) )
- { /* pos can get to 0 at end of main seq, if still diffs left...*/
- if (readpp->is->method->debug >3)
- logf(LOG_LOG,"isamd_merge: released block %d (%d:%d) now %d=%d:%d",
- isamd_addr(killblk,readpp->cat), readpp->cat, killblk,
- isamd_addr(readpp->pos,readpp->cat),readpp->cat, readpp->pos );
- isamd_release_block(readpp->is, readpp->cat, readpp->pos);
- killblk=readpp->pos;
- }
-
- /* (try to) read next item */
- r_ptr= (char *) &r_key;
- r_more = isamd_read_item( readpp, &r_ptr);
-
- } /* while read */
-
- /* set things up so that append can continue */
- isamd_reduceblock(firstpp);
- firstpp->diffs=0;
-
- if (firstpp!=pp)
- { /* the last data block is of no interest any more */
- save_last_pp(pp);
- if (readpp->is->method->debug >4)
- logf(LOG_LOG,"isamd_merge: saved last block %d=%d:%d",
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos);
- isamd_pp_close(pp);
- }
-
- if (readpp->is->method->debug >5)
- logf(LOG_LOG,"isamd_merge: closing readpp %d=%d:%d di=%p",
- isamd_addr(readpp->pos,readpp->cat), readpp->cat, readpp->pos,
- readpp->diffinfo);
- isamd_pp_close(readpp); /* pos is 0 by now, at eof. close works anyway */
-
- (*firstpp->is->method->code_stop)(ISAMD_ENCODE, encoder_data);
-
- *p_firstpp = firstpp;
-
- if (readpp->is->method->debug >2)
- logf(LOG_LOG,"isamd_merge: merge ret %d=%d:%d nx=%d=%d:%d d=%d=2*%d+%d",
- isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
- pp->next, isamd_type(pp->next), isamd_block(pp->next),
- pp->diffs, pp->diffs/2, pp->diffs &1 );
- return 0;
-
-} /* merge */
-
-
-
-/***************************************************************
- * Appending diffs
- ***************************************************************/
-
-
-
-static int append_diffs(ISAMD is, ISAMD_P ipos, ISAMD_I data)
-{
- struct it_key i_key; /* one input item */
- char *i_item = (char *) &i_key; /* same as chars */
- char *i_ptr=i_item;
- int i_more =1;
- int i_mode; /* 0 for delete, 1 for insert */
-
- ISAMD_PP firstpp;
- ISAMD_PP pp;
- void *encoder_data;
- char hexbuff[64];
- int diffidx=0;
- int maxsize=0;
- int difflenidx;
- char codebuff[128];
- char *c_ptr = codebuff;
- int codelen;
- int merge_rc;
- int mergecount=0;
-
- ++(is->files[0].no_appds);
-
- firstpp=isamd_pp_open(is, ipos);
- if (is->method->debug >2)
- logf(LOG_LOG,"isamd_appd: Start ipos=%d=%d:%d d=%d=%d*2+%d nk=%d",
- ipos, isamd_type(ipos), isamd_block(ipos),
- firstpp->diffs, firstpp->diffs/2, firstpp->diffs & 1, firstpp->numKeys);
- pp=read_diff_block(firstpp, &diffidx);
- encoder_data=(*is->method->code_start)(ISAMD_ENCODE);
- maxsize = is->method->filecat[pp->cat].bsize;
-
- difflenidx = diffidx;
- diffidx+=sizeof(int); /* difflen will be stored here */
-
- /* read first input */
- i_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_ptr, &i_mode);
-
- if (is->method->debug >6)
- logf(LOG_LOG,"isamd_appd: start with m=%d %s",
- i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
-
- while (i_more)
- {
- /* store the mode bit inside key */
- assert( ((i_key.seqno<<1)>>1) == i_key.seqno); /* can spare the bit */
- i_key.seqno = i_key.seqno * 2 + i_mode;
-
- c_ptr=codebuff;
- i_ptr=i_item;
- (*is->method->code_item)(ISAMD_ENCODE, encoder_data, &c_ptr, &i_ptr);
- codelen = c_ptr - codebuff;
- assert ( (codelen<128) && (codelen>0));
- if (is->method->debug >7)
- logf(LOG_LOG,"isamd_appd: coded into %d: %s (nk=%d) (ix=%d)",
- codelen, hexdump(codebuff, codelen,hexbuff),
- firstpp->numKeys,diffidx);
-
- if (diffidx + codelen > maxsize )
- { /* block full */
- if (is->method->debug >3)
- logf(LOG_LOG,"isamd_appd: block full (ix=%d mx=%d lix=%d)",
- diffidx, maxsize, difflenidx);
- if (is->method->debug >8)
- logf(LOG_LOG,"isamd_appd: block pp=%p buf=%p [%d]:%s",
- pp, pp->buf,
- difflenidx, hexdump(&pp->buf[difflenidx],8,0));
- if (mergecount++)
- ++(is->files[0].no_remerges);
- merge_rc = merge (&firstpp, &pp, &i_key);
- if (0!=merge_rc)
- return merge_rc; /* merge handled them all ! */
-
- /* set things up so we can continue */
- pp = read_diff_block(firstpp, &diffidx);
- (*is->method->code_reset)(encoder_data);
- maxsize = is->method->filecat[pp->cat].bsize;
- difflenidx=diffidx;
- diffidx+=sizeof(int);
-
- /* code the current input key again */
- c_ptr=codebuff;
- i_ptr=i_item;
- (*is->method->code_item)(ISAMD_ENCODE, encoder_data, &c_ptr, &i_ptr);
- codelen = c_ptr - codebuff;
- assert ( (codelen<128) && (codelen>0));
- if (is->method->debug >7)
- logf(LOG_LOG,"isamd_appd: recoded into %d: %s (nk=%d) (ix=%d)",
- codelen, hexdump(codebuff, codelen,hexbuff),
- firstpp->numKeys,diffidx);
-
- } /* block full */
-
- /* Note: this goes horribly wrong if there is no room for the diff */
- /* after the merge! The solution is to increase the limit in */
- /* separateDiffBlock, to force a separate diff block earlier, and not */
- /* to have absurdly small blocks */
- assert ( diffidx+codelen <= maxsize );
-
- /* save the diff */
- memcpy(&(pp->buf[diffidx]),codebuff,codelen);
- diffidx += codelen;
- if (i_mode)
- firstpp->numKeys++; /* insert diff */
- else
- firstpp->numKeys--; /* delete diff */
-
- /* update length of this diff run */
- memcpy(&(pp->buf[difflenidx]),&diffidx,sizeof(diffidx));
- if (firstpp==pp)
- firstpp->diffs =diffidx*2+0;
- else
- pp->size =diffidx;
-
- /* (try to) read the next input */
- i_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_ptr, &i_mode);
- if ( (i_more) && (is->method->debug >6) )
- logf(LOG_LOG,"isamd_appd: got m=%d %s",
- i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
- } /* more loop */