*
* merge-d.c: merge routines for isamd
*
+ * todo
+ * - merge when needed
+ * - single-entry optimizing
+ * - study and optimize block sizes (later)
+ *
+ * bugs
+ * not yet ready
+ *
+ * caveat
+ * There is aconfusion about the block addresses. cat or type is the category,
+ * pos or block is the block number. pp structures keep these two separate,
+ * and combine when saving the pp. The next pointer in the pp structure is
+ * also a combined address, but needs to be combined every time it is needed,
+ * and separated when the partss are needed... This is done with the isamd_
+ * _block, _type, and _addr macros. The _addr takes block and type as args,
+ * in that order. This conflicts with the order these are often mentioned in
+ * the debug log calls, and other places, leading to small mistakes here
+ * and there.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <log.h>
+#include "../index/index.h"
#include "isamd-p.h"
+struct ISAMD_DIFF_s {
+ int diffidx;
+ int maxidx;
+ struct it_key key;
+ void *decodeData;
+ int mode;
+};
+
+
+
static char *hexdump(unsigned char *p, int len, char *buff) {
static char localbuff[128];
char bytebuff[8];
}
-/* isamd - heikki's append-only isam
- *
- * The record pointers arre kept in a linked list of buffers, as usual.
- * When modifying the list, we just store diffs at the end of it (either
- * in the only block, or in a separate block). Occasionally we have too
- * many blocks, and then we merge the diffs into the list.
- */
+static int separateDiffBlock(ISAMD_PP pp)
+{
+ return ( 0 != pp->next);
+}
+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 +1;
+ /* 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 > 4)
+ logf(LOG_LOG,"isamd_getDiffInfo: %d (%d:%d), ix=%d mx=%d",
+ isamd_addr(pp->pos, pp->cat), pp->cat, pp->pos, diffidx,maxinfos);
-ISAMD_P isamd_append (ISAMD is, ISAMD_P ipos, ISAMD_I data)
+ while (i<maxinfos)
+ {
+ if ( diffidx+sizeof(int) > pp->is->method->filecat[pp->cat].bsize )
+ {
+ if (pp->is->method->debug > 4)
+ 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 (0==pp->diffinfo[i].maxidx)
+ {
+ if (pp->is->method->debug > 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 > 4)
+ 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=pp->diffs/2;
+ isamd_read_block (pp->is, isamd_type(diffaddr),
+ isamd_block(diffaddr), pp->diffbuf );
+ diffidx= ISAMD_BLOCK_OFFSET_N;
+ }
+ else
+ { /* integrated block, just set the pointers */
+ pp->diffbuf = pp->buf;
+ diffidx = pp->size; /* size is the beginning of diffs, diffidx the end*/
+ }
+ getDiffInfo(pp,diffidx);
+} /* loadDiffs */
+
+
+void isamd_free_diffs(ISAMD_PP pp)
{
- char i_item[128]; /* one input item */
- char *i_ptr=i_item;
- int i_more =1;
- int i_mode; /* 0 for delete, 1 for insert */
-
- int retval=0;
-
- while (i_more)
+ int i;
+ if (!pp->diffinfo)
+ return;
+ for (i=0;pp->diffinfo[i].decodeData;i++)
+ (*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)
{
- i_ptr = i_item;
- i_more = (*data->read_item)(data->clientData, &i_ptr, &i_mode);
- if (!retval)
- memcpy(&retval,i_item, sizeof(retval));
+ 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 > 4)
+ 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 > 4)
+ 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 > 4)
+ 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 > 4)
+ 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?*/
+ } /* earlier key */
+ else if (cmp==0)
+ {
+ if (!pp->diffinfo[i].mode) /* delete diff. should always be */
+ {
+ if (pp->is->method->debug > 4)
+ 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 > 4)
+ 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 */
+ 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 > 4)
+ 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 > 4)
+ 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 retval;
-} /* isamh_append */
+ return cmp;
+
+} /* isamd_read_item */
+
+
+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 > 2)
+ 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 > 2)
+ logf(LOG_LOG,"isamd_reduce: got p=%d c=%d sz=%d",
+ pp->pos, pp->cat, pp->size);
+} /* reduceblock */
+
+
+static int isamd_build_first_block(ISAMD is, ISAMD_I data)
+{
+ char i_item[128]; /* one input item */
+ 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;
+ int maxsize;
+
+ char codebuff[128];
+ char *c_ptr = codebuff;
+ int codelen;
+
+ char hexbuff[64];
+ int newblock;
+ int retval=0;
+
+ 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);
+ maxsize = is->method->filecat[is->max_cat].bsize;
+
+ if (is->method->debug >3)
+ logf(LOG_LOG,"isamd_bld start: p=%d c=%d sz=%d maxsz=%d ",
+ pp->pos, pp->cat, pp->size, maxsize);
+
+ /* read first input */
+ i_ptr = i_item;
+ i_more = (*data->read_item)(data->clientData, &i_ptr, &i_mode);
+
+ if (is->method->debug >3)
+ 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 */
+
+ 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 >3)
+ 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 */
+ 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(is, firstpp->cat);
+ }
+ newblock = isamd_alloc_block(is, firstpp->cat);
+ firstpp->next = isamd_addr(newblock,firstpp->cat);
+ /* keep the largest category */
+ pp=isamd_pp_open(is,isamd_addr(0,firstpp->cat));/*don't load*/
+ pp->pos=newblock;
+ pp->size = pp->offset = ISAMD_BLOCK_OFFSET_N;
+ pp->next=0;
+ if (is->method->debug >3)
+ logf(LOG_LOG,"isamd_build: 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(is, firstpp->cat);
+ pp->next = isamd_addr(newblock,firstpp->cat);
+ isamd_buildlaterblock(pp);
+ isamd_write_block(is,pp->cat,pp->pos,pp->buf);
+ pp->size = pp->offset = ISAMD_BLOCK_OFFSET_N;
+ pp->next=0;
+ pp->cat = firstpp->cat;
+ pp->pos = isamd_block(firstpp->next);
+ }
+ /* reset encoging and code again */
+ (*is->method->code_reset)(encoder_data);
+ 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 >3)
+ 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 have room */
+ memcpy(&(pp->buf[pp->offset]),codebuff,codelen);
+ pp->offset += codelen;
+ pp->size += codelen;
+ firstpp->numKeys++;
+ } /* 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) && (is->method->debug >3) )
+ logf(LOG_LOG,"isamd: build_fi start: m=%d %s",
+ i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
+
+
+ } /* i_more */
+
+ /* 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 */
+
+ /* save the first block */
+ isamd_reduceblock(firstpp);
+ isamd_buildfirstblock(firstpp);
+ isamd_write_block(is,firstpp->cat,firstpp->pos,firstpp->buf);
+ retval = isamd_addr(firstpp->pos,firstpp->cat);
+
+ if (firstpp!=pp){ /* and the last one */
+ pp->next = 0;/* just to be sure */
+ isamd_buildlaterblock(pp);
+ isamd_write_block(is,pp->cat,pp->pos,pp->buf);
+ isamd_pp_close(pp);
+ }
+
+ isamd_pp_close(firstpp);
+
+ return retval;
+} /* build_first_block */
+
+
+
+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 retval=ipos; /* by default we do not change the firstblock addr */
+ int diffidx=0;
+ int maxsize=0;
+ int difflenidx;
+ char codebuff[128];
+ char *c_ptr = codebuff;
+ int codelen;
+
+ pp=firstpp=isamd_pp_open(is, ipos);
+
+ /* TODO: Turn these ifs around! Check first diffs==0, and create new */
+ /* according to separateDiffBlock. if !=0, read according to its type */
+ /* bit. Much more robust this way around! */
+
+ if (separateDiffBlock(firstpp))
+ { /* multi-block item, get the diff block */
+ if (firstpp->diffs==0)
+ { /* allocate first diff block */
+ pp=isamd_pp_open(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 (is->method->debug >3)
+ logf(LOG_LOG,"isamd_appd: alloc diff (%d) %d %d:%d ix=%d",
+ firstpp->diffs,
+ isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
+ diffidx);
+ }
+ else
+ { /* find pointers within the existing block */
+ pp=isamd_pp_open(is, firstpp->diffs/2);
+ diffidx = pp->offset= pp->size;
+ if (is->method->debug >3)
+ logf(LOG_LOG,"isamd_appd: load diff (%d) %d (%d:%d) ix=%d",
+ firstpp->diffs,
+ isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
+ diffidx);
+ }
+ }
+ else
+ { /* single-block item, get idx right */
+ diffidx= pp->diffs/2;
+ if (is->method->debug >3)
+ logf(LOG_LOG,"isamd_appd: diffs in head %d (%d:%d) ix=%d sz=%d",
+ isamd_addr(pp->pos,pp->cat), pp->cat, pp->pos,
+ diffidx, pp->size);
+ if (0==diffidx)
+ { /* no diffs yet, make them */
+ diffidx = pp->size;
+ pp->diffs = diffidx *2 +0;
+ }
+ }
+
+ 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 >3)
+ logf(LOG_LOG,"isamd_appd: start with m=%d %s",
+ i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
+
+ while (i_more)
+ {
+ 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 >3)
+ 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 */
+ logf(LOG_LOG,"isamd_appd: block full (ix=%d mx=%d)",
+ diffidx, maxsize);
+ return 0; /*!*/ /* do something about it!!! */
+ } /* block full */
+
+ /* save the diff */
+ memcpy(&(pp->buf[diffidx]),codebuff,codelen);
+ diffidx += codelen;
+ if (i_mode)
+ firstpp->numKeys++; /* insert diff */
+ else
+ firstpp->numKeys--; /* delete diff */
+ 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 >3) )
+ logf(LOG_LOG,"isamd_appd: got m=%d %s",
+ i_mode, hexdump(i_item,i_ptr-i_item,hexbuff) );
+ } /* more loop */
+
+ /* clear the next difflen, if room for such */
+ difflenidx = diffidx;
+ while ( (difflenidx-diffidx<=sizeof(int)) && (difflenidx<maxsize))
+ pp->buf[difflenidx++]='\0';
+
+ /* ok, save the block(s) */
+ if (firstpp != pp)
+ { /* save the diff block */
+ pp->next = 0; /* just to be sure */
+ isamd_buildlaterblock(pp);
+ isamd_write_block(is,pp->cat,pp->pos,pp->buf);
+ isamd_pp_close(pp);
+ }
+
+ isamd_buildfirstblock(firstpp);
+ isamd_write_block(is,firstpp->cat,firstpp->pos,firstpp->buf);
+ retval = isamd_addr(firstpp->pos,firstpp->cat);
+ isamd_pp_close(firstpp);
+
+ return retval;
+} /* append_diffs */
+
+
+
+ISAMD_P isamd_append (ISAMD is, ISAMD_P ipos, ISAMD_I data)
+{
+ int retval=0;
+
+ if (0==ipos)
+ retval = isamd_build_first_block(is,data);
+ else
+ retval = append_diffs(is,ipos,data);
+
+ return retval;
+} /* isamd_append */
/*
* $Log: merge-d.c,v $
- * Revision 1.2 1999-07-14 15:05:30 heikki
- * slow start on isam-d
+ * Revision 1.3 1999-07-21 14:24:50 heikki
+ * isamd write and read functions ok, except when diff block full.
+ * (merge not yet done)
*
* Revision 1.1 1999/07/14 13:14:47 heikki
* Created empty
*/
+
+
projects / idzebra-moved-to-github.git / blobdiff