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openldap/servers/slapd/back-bdb2/idl.c

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/* idl.c - ldap id list handling routines */
#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include <ac/socket.h>
#include "ldapconfig.h"
#include "slap.h"
#include "back-bdb2.h"
static ID_BLOCK* idl_dup( ID_BLOCK *idl );
/* Allocate an ID_BLOCK with room for nids ids */
ID_BLOCK *
bdb2i_idl_alloc( unsigned int nids )
{
ID_BLOCK *new;
/* nmax + nids + space for the ids */
new = (ID_BLOCK *) ch_calloc( (ID_BLOCK_IDS_OFFSET + nids), sizeof(ID) );
ID_BLOCK_NMAX(new) = nids;
ID_BLOCK_NIDS(new) = 0;
return( new );
}
/* Allocate an empty ALLIDS ID_BLOCK */
ID_BLOCK *
bdb2i_idl_allids( BackendDB *be )
{
ID_BLOCK *idl;
idl = bdb2i_idl_alloc( 0 );
ID_BLOCK_NMAX(idl) = ID_BLOCK_ALLIDS_VALUE;
ID_BLOCK_NIDS(idl) = bdb2i_next_id_get( be );
return( idl );
}
/* Free an ID_BLOCK */
void
bdb2i_idl_free( ID_BLOCK *idl )
{
if ( idl == NULL ) {
Debug( LDAP_DEBUG_TRACE,
"bdb2i_idl_free: called with NULL pointer\n",
0, 0, 0 );
return;
}
free( (char *) idl );
}
/* Fetch an single ID_BLOCK from the cache */
static ID_BLOCK *
idl_fetch_one(
BackendDB *be,
struct dbcache *db,
Datum key
)
{
Datum data;
ID_BLOCK *idl;
ldbm_datum_init( data );
/* Debug( LDAP_DEBUG_TRACE, "=> idl_fetch_one\n", 0, 0, 0 ); */
data = bdb2i_cache_fetch( db, key );
if( data.dptr == NULL ) {
return NULL;
}
idl = idl_dup( (ID_BLOCK *) data.dptr);
ldbm_datum_free( db->dbc_db, data );
return( idl );
}
/* Fetch a set of ID_BLOCKs from the cache
* if not INDIRECT
* if block return is an ALLIDS block,
* return an new ALLIDS block
* otherwise
* return block
* construct super block from all blocks referenced by INDIRECT block
* return super block
*/
ID_BLOCK *
bdb2i_idl_fetch(
BackendDB *be,
struct dbcache *db,
Datum key
)
{
Datum data;
ID_BLOCK *idl;
ID_BLOCK **tmp;
char *kstr;
int i, nids;
idl = idl_fetch_one( be, db, key );
if ( idl == NULL ) {
return NULL;
}
if ( ID_BLOCK_ALLIDS(idl) ) {
/* all ids block */
/* make sure we have the current value of highest id */
bdb2i_idl_free( idl );
idl = bdb2i_idl_allids( be );
return( idl );
}
if ( ! ID_BLOCK_INDIRECT( idl ) ) {
/* regular block */
return( idl );
}
/*
* this is an indirect block which points to other blocks.
* we need to read in all the blocks it points to and construct
* a big id list containing all the ids, which we will return.
*/
/* count the number of blocks & allocate space for pointers to them */
for ( i = 0; !ID_BLOCK_NOID(idl, i); i++ )
; /* NULL */
tmp = (ID_BLOCK **) ch_malloc( (i + 1) * sizeof(ID_BLOCK *) );
/* read in all the blocks */
kstr = (char *) ch_malloc( key.dsize + 20 );
nids = 0;
for ( i = 0; !ID_BLOCK_NOID(idl, i); i++ ) {
ldbm_datum_init( data );
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr, ID_BLOCK_ID(idl, i) );
data.dptr = kstr;
data.dsize = strlen( kstr ) + 1;
if ( (tmp[i] = idl_fetch_one( be, db, data )) == NULL ) {
Debug( LDAP_DEBUG_ANY,
"idl_fetch of (%s) returns NULL\n", data.dptr, 0, 0 );
continue;
}
nids += ID_BLOCK_NIDS(tmp[i]);
}
tmp[i] = NULL;
free( kstr );
bdb2i_idl_free( idl );
/* allocate space for the big block */
idl = bdb2i_idl_alloc( nids );
ID_BLOCK_NIDS(idl) = nids;
nids = 0;
/* copy in all the ids from the component blocks */
for ( i = 0; tmp[i] != NULL; i++ ) {
if ( tmp[i] == NULL ) {
continue;
}
SAFEMEMCPY(
(char *) &ID_BLOCK_ID(idl, nids),
(char *) &ID_BLOCK_ID(tmp[i], 0),
ID_BLOCK_NIDS(tmp[i]) * sizeof(ID) );
nids += ID_BLOCK_NIDS(tmp[i]);
bdb2i_idl_free( tmp[i] );
}
free( (char *) tmp );
Debug( LDAP_DEBUG_TRACE, "<= bdb2i_idl_fetch %ld ids (%ld max)\n",
ID_BLOCK_NIDS(idl), ID_BLOCK_NMAX(idl), 0 );
return( idl );
}
/* store a single block */
static int
idl_store(
BackendDB *be,
struct dbcache *db,
Datum key,
ID_BLOCK *idl
)
{
int rc, flags;
Datum data;
struct ldbminfo *li = (struct ldbminfo *) be->be_private;
ldbm_datum_init( data );
/* Debug( LDAP_DEBUG_TRACE, "=> idl_store\n", 0, 0, 0 ); */
data.dptr = (char *) idl;
data.dsize = (ID_BLOCK_IDS_OFFSET + ID_BLOCK_NMAX(idl)) * sizeof(ID);
#ifdef LDBM_DEBUG
Statslog( LDAP_DEBUG_STATS, "<= idl_store(): rc=%d\n",
rc, 0, 0, 0, 0 );
#endif
flags = LDBM_REPLACE;
if( li->li_dbcachewsync ) flags |= LDBM_SYNC;
rc = bdb2i_cache_store( db, key, data, flags );
/* Debug( LDAP_DEBUG_TRACE, "<= idl_store %d\n", rc, 0, 0 ); */
return( rc );
}
/* split the block at id
* locate ID greater than or equal to id.
*/
static void
idl_split_block(
ID_BLOCK *b,
ID id,
ID_BLOCK **right,
ID_BLOCK **left
)
{
unsigned int nr, nl;
/* find where to split the block *//* XXX linear search XXX */
for ( nr = 0; nr < ID_BLOCK_NIDS(b) && id > ID_BLOCK_ID(b, nr); nr++ )
; /* NULL */
nl = ID_BLOCK_NIDS(b) - nr;
*right = bdb2i_idl_alloc( nr == 0 ? 1 : nr );
*left = bdb2i_idl_alloc( nl + (nr == 0 ? 0 : 1));
/*
* everything before the id being inserted in the first block
* unless there is nothing, in which case the id being inserted
* goes there.
*/
if ( nr == 0 ) {
ID_BLOCK_NIDS(*right) = 1;
ID_BLOCK_ID(*right, 0) = id;
} else {
SAFEMEMCPY(
(char *) &ID_BLOCK_ID(*right, 0),
(char *) &ID_BLOCK_ID(b, 0),
nr * sizeof(ID) );
ID_BLOCK_NIDS(*right) = nr;
ID_BLOCK_ID(*left, 0) = id;
}
/* the id being inserted & everything after in the second block */
SAFEMEMCPY(
(char *) &ID_BLOCK_ID(*left, (nr == 0 ? 0 : 1)),
(char *) &ID_BLOCK_ID(b, nr),
nl * sizeof(ID) );
ID_BLOCK_NIDS(*left) = nl + (nr == 0 ? 0 : 1);
}
/*
* idl_change_first - called when an indirect block's first key has
* changed, meaning it needs to be stored under a new key, and the
* header block pointing to it needs updating.
*/
static int
idl_change_first(
BackendDB *be,
struct dbcache *db,
Datum hkey, /* header block key */
ID_BLOCK *h, /* header block */
int pos, /* pos in h to update */
Datum bkey, /* data block key */
ID_BLOCK *b /* data block */
)
{
int rc;
/* Debug( LDAP_DEBUG_TRACE, "=> idl_change_first\n", 0, 0, 0 ); */
/* delete old key block */
if ( (rc = bdb2i_cache_delete( db, bkey )) != 0 ) {
Debug( LDAP_DEBUG_ANY,
"bdb2i_db_delete of (%s) returns %d\n", bkey.dptr, rc,
0 );
return( rc );
}
/* write block with new key */
sprintf( bkey.dptr, "%c%s%ld", CONT_PREFIX, hkey.dptr, ID_BLOCK_ID(b, 0) );
bkey.dsize = strlen( bkey.dptr ) + 1;
if ( (rc = idl_store( be, db, bkey, b )) != 0 ) {
Debug( LDAP_DEBUG_ANY,
"idl_store of (%s) returns %d\n", bkey.dptr, rc, 0 );
return( rc );
}
/* update + write indirect header block */
ID_BLOCK_ID(h, pos) = ID_BLOCK_ID(b, 0);
if ( (rc = idl_store( be, db, hkey, h )) != 0 ) {
Debug( LDAP_DEBUG_ANY,
"idl_store of (%s) returns %d\n", hkey.dptr, rc, 0 );
return( rc );
}
return( 0 );
}
int
bdb2i_idl_insert_key(
BackendDB *be,
struct dbcache *db,
Datum key,
ID id
)
{
int i, j, first, rc;
ID_BLOCK *idl, *tmp, *tmp2, *tmp3;
char *kstr;
Datum k2;
ldbm_datum_init( k2 );
if ( (idl = idl_fetch_one( be, db, key )) == NULL ) {
#ifdef LDBM_DEBUG
Statslog( LDAP_DEBUG_STATS, "=> bdb2i_idl_insert_key(): no key yet\n",
0, 0, 0, 0, 0 );
#endif
idl = bdb2i_idl_alloc( 1 );
ID_BLOCK_ID(idl, ID_BLOCK_NIDS(idl)++) = id;
rc = idl_store( be, db, key, idl );
bdb2i_idl_free( idl );
return( rc );
}
if ( ID_BLOCK_ALLIDS( idl ) ) {
/* ALLIDS */
bdb2i_idl_free( idl );
return 0;
}
if ( ! ID_BLOCK_INDIRECT( idl ) ) {
/* regular block */
switch ( bdb2i_idl_insert( &idl, id, db->dbc_maxids ) ) {
case 0: /* id inserted - store the updated block */
case 1:
rc = idl_store( be, db, key, idl );
break;
case 2: /* id already there - nothing to do */
rc = 0;
break;
case 3: /* id not inserted - block must be split */
/* check threshold for marking this an all-id block */
if ( db->dbc_maxindirect < 2 ) {
bdb2i_idl_free( idl );
idl = bdb2i_idl_allids( be );
rc = idl_store( be, db, key, idl );
bdb2i_idl_free( idl );
return( rc );
}
idl_split_block( idl, id, &tmp, &tmp2 );
bdb2i_idl_free( idl );
/* create the header indirect block */
idl = bdb2i_idl_alloc( 3 );
ID_BLOCK_NMAX(idl) = 3;
ID_BLOCK_NIDS(idl) = ID_BLOCK_INDIRECT_VALUE;
ID_BLOCK_ID(idl, 0) = ID_BLOCK_ID(tmp, 0);
ID_BLOCK_ID(idl, 1) = ID_BLOCK_ID(tmp2, 0);
ID_BLOCK_ID(idl, 2) = NOID;
/* store it */
rc = idl_store( be, db, key, idl );
/* store the first id block */
kstr = (char *) ch_malloc( key.dsize + 20 );
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr,
ID_BLOCK_ID(tmp, 0) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
rc = idl_store( be, db, k2, tmp );
/* store the second id block */
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr,
ID_BLOCK_ID(tmp2, 0) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
rc = idl_store( be, db, k2, tmp2 );
free( kstr );
bdb2i_idl_free( tmp );
bdb2i_idl_free( tmp2 );
break;
}
bdb2i_idl_free( idl );
return( rc );
}
/*
* this is an indirect block which points to other blocks.
* we need to read in the block into which the id should be
* inserted, then insert the id and store the block. we might
* have to split the block if it is full, which means we also
* need to write a new "header" block.
*/
/* select the block to try inserting into *//* XXX linear search XXX */
for ( i = 0; !ID_BLOCK_NOID(idl, i) && id > ID_BLOCK_ID(idl, i); i++ )
; /* NULL */
if ( i != 0 ) {
i--;
first = 0;
} else {
first = 1;
}
/* get the block */
kstr = (char *) ch_malloc( key.dsize + 20 );
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr, ID_BLOCK_ID(idl, i) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
if ( (tmp = idl_fetch_one( be, db, k2 )) == NULL ) {
Debug( LDAP_DEBUG_ANY, "nonexistent continuation block (%s)\n",
k2.dptr, 0, 0 );
free( kstr );
return( -1 );
}
/* insert the id */
switch ( bdb2i_idl_insert( &tmp, id, db->dbc_maxids ) ) {
case 0: /* id inserted ok */
if ( (rc = idl_store( be, db, k2, tmp )) != 0 ) {
Debug( LDAP_DEBUG_ANY,
"idl_store of (%s) returns %d\n", k2.dptr, rc, 0 );
}
break;
case 1: /* id inserted - first id in block has changed */
/*
* key for this block has changed, so we have to
* write the block under the new key, delete the
* old key block + update and write the indirect
* header block.
*/
rc = idl_change_first( be, db, key, idl, i, k2, tmp );
break;
case 2: /* id not inserted - already there */
break;
case 3: /* id not inserted - block is full */
/*
* first, see if it will fit in the next block,
* without splitting, unless we're trying to insert
* into the beginning of the first block.
*/
/* is there a next block? */
if ( !first && !ID_BLOCK_NOID(idl, i + 1) ) {
/* read it in */
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr,
ID_BLOCK_ID(idl, i + 1) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
if ( (tmp2 = idl_fetch_one( be, db, k2 )) == NULL ) {
Debug( LDAP_DEBUG_ANY,
"idl_fetch_one (%s) returns NULL\n",
k2.dptr, 0, 0 );
break;
}
switch ( (rc = bdb2i_idl_insert( &tmp2, id,
db->dbc_maxids )) ) {
case 1: /* id inserted first in block */
rc = idl_change_first( be, db, key, idl,
i + 1, k2, tmp2 );
/* FALL */
case 2: /* id already there - how? */
case 0: /* id inserted */
if ( rc == 2 ) {
Debug( LDAP_DEBUG_ANY,
"id %ld already in next block\n",
id, 0, 0 );
}
free( kstr );
bdb2i_idl_free( tmp );
bdb2i_idl_free( tmp2 );
bdb2i_idl_free( idl );
return( 0 );
case 3: /* split the original block */
bdb2i_idl_free( tmp2 );
break;
}
}
/*
* must split the block, write both new blocks + update
* and write the indirect header block.
*/
/* count how many indirect blocks *//* XXX linear count XXX */
for ( j = 0; !ID_BLOCK_NOID(idl, j); j++ )
; /* NULL */
/* check it against all-id thresholed */
if ( j + 1 > db->dbc_maxindirect ) {
/*
* we've passed the all-id threshold, meaning
* that this set of blocks should be replaced
* by a single "all-id" block. our job: delete
* all the indirect blocks, and replace the header
* block by an all-id block.
*/
/* delete all indirect blocks */
for ( j = 0; !ID_BLOCK_NOID(idl, j); j++ ) {
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr,
ID_BLOCK_ID(idl, j) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
rc = bdb2i_cache_delete( db, k2 );
}
/* store allid block in place of header block */
bdb2i_idl_free( idl );
idl = bdb2i_idl_allids( be );
rc = idl_store( be, db, key, idl );
free( kstr );
bdb2i_idl_free( idl );
bdb2i_idl_free( tmp );
return( rc );
}
idl_split_block( tmp, id, &tmp2, &tmp3 );
bdb2i_idl_free( tmp );
/* create a new updated indirect header block */
tmp = bdb2i_idl_alloc( ID_BLOCK_NMAX(idl) + 1 );
ID_BLOCK_NIDS(tmp) = ID_BLOCK_INDIRECT_VALUE;
/* everything up to the split block */
SAFEMEMCPY(
(char *) &ID_BLOCK_ID(tmp, 0),
(char *) &ID_BLOCK_ID(idl, 0),
i * sizeof(ID) );
/* the two new blocks */
ID_BLOCK_ID(tmp, i) = ID_BLOCK_ID(tmp2, 0);
ID_BLOCK_ID(tmp, i + 1) = ID_BLOCK_ID(tmp3, 0);
/* everything after the split block */
SAFEMEMCPY(
(char *) &ID_BLOCK_ID(tmp, i + 2),
(char *) &ID_BLOCK_ID(idl, i + 1),
(ID_BLOCK_NMAX(idl) - i - 1) * sizeof(ID) );
/* store the header block */
rc = idl_store( be, db, key, tmp );
/* store the first id block */
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr,
ID_BLOCK_ID(tmp2, 0) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
rc = idl_store( be, db, k2, tmp2 );
/* store the second id block */
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr,
ID_BLOCK_ID(tmp3, 0) );
k2.dptr = kstr;
k2.dsize = strlen( kstr ) + 1;
rc = idl_store( be, db, k2, tmp3 );
bdb2i_idl_free( tmp2 );
bdb2i_idl_free( tmp3 );
break;
}
free( kstr );
bdb2i_idl_free( tmp );
bdb2i_idl_free( idl );
return( rc );
}
/*
* bdb2i_idl_insert - insert an id into an id list.
*
* returns
* 0 id inserted
* 1 id inserted, first id in block has changed
* 2 id not inserted, already there
* 3 id not inserted, block must be split
*/
int
bdb2i_idl_insert( ID_BLOCK **idl, ID id, unsigned int maxids )
{
unsigned int i, j;
if ( ID_BLOCK_ALLIDS( *idl ) ) {
return( 2 ); /* already there */
}
/* is it already there? *//* XXX linear search XXX */
for ( i = 0; i < ID_BLOCK_NIDS(*idl) && id > ID_BLOCK_ID(*idl, i); i++ ) {
; /* NULL */
}
if ( i < ID_BLOCK_NIDS(*idl) && ID_BLOCK_ID(*idl, i) == id ) {
return( 2 ); /* already there */
}
/* do we need to make room for it? */
if ( ID_BLOCK_NIDS(*idl) == ID_BLOCK_NMAX(*idl) ) {
/* make room or indicate block needs splitting */
if ( ID_BLOCK_NMAX(*idl) >= maxids ) {
return( 3 ); /* block needs splitting */
}
ID_BLOCK_NMAX(*idl) *= 2;
if ( ID_BLOCK_NMAX(*idl) > maxids ) {
ID_BLOCK_NMAX(*idl) = maxids;
}
*idl = (ID_BLOCK *) ch_realloc( (char *) *idl,
(ID_BLOCK_NMAX(*idl) + ID_BLOCK_IDS_OFFSET) * sizeof(ID) );
}
/* make a slot for the new id *//* XXX bubble move XXX */
for ( j = ID_BLOCK_NIDS(*idl); j != i; j-- ) {
ID_BLOCK_ID(*idl, j) = ID_BLOCK_ID(*idl, j-1);
}
ID_BLOCK_ID(*idl, i) = id;
ID_BLOCK_NIDS(*idl)++;
(void) memset(
(char *) &ID_BLOCK_ID((*idl), ID_BLOCK_NIDS(*idl)),
'\0',
(ID_BLOCK_NMAX(*idl) - ID_BLOCK_NIDS(*idl)) * sizeof(ID) );
return( i == 0 ? 1 : 0 ); /* inserted - first id changed or not */
}
int
bdb2i_idl_delete_key (
BackendDB *be,
struct dbcache *db,
Datum key,
ID id
)
{
Datum data;
ID_BLOCK *idl, *tmp;
unsigned i;
int j, nids;
char *kstr;
if ( (idl = idl_fetch_one( be, db, key ) ) == NULL )
{
/* It wasn't found. Hmm... */
return -1;
}
if ( ID_BLOCK_ALLIDS( idl ) ) {
bdb2i_idl_free( idl );
return 0;
}
if ( ! ID_BLOCK_INDIRECT( idl ) ) {
for ( i=0; i < ID_BLOCK_NIDS(idl); i++ ) {
if ( ID_BLOCK_ID(idl, i) == id ) {
if( --ID_BLOCK_NIDS(idl) == 0 ) {
bdb2i_cache_delete( db, key );
} else {
SAFEMEMCPY (
&ID_BLOCK_ID(idl, i),
&ID_BLOCK_ID(idl, i+1),
(ID_BLOCK_NIDS(idl)-i) * sizeof(ID) );
ID_BLOCK_ID(idl, ID_BLOCK_NIDS(idl)) = NOID;
idl_store( be, db, key, idl );
}
return 0;
}
/* We didn't find the ID. Hmmm... */
}
return -1;
}
/* We have to go through an indirect block and find the ID
in the list of IDL's
*/
for ( nids = 0; !ID_BLOCK_NOID(idl, nids); nids++ )
; /* NULL */
kstr = (char *) ch_malloc( key.dsize + 20 );
for ( j = 0; !ID_BLOCK_NOID(idl, j); j++ )
{
ldbm_datum_init( data );
sprintf( kstr, "%c%s%ld", CONT_PREFIX, key.dptr, ID_BLOCK_ID(idl, j) );
data.dptr = kstr;
data.dsize = strlen( kstr ) + 1;
if ( (tmp = idl_fetch_one( be, db, data )) == NULL ) {
Debug( LDAP_DEBUG_ANY,
"bdb2i_idl_fetch of (%s) returns NULL\n", data.dptr, 0, 0 );
continue;
}
/*
Now try to find the ID in tmp
*/
for ( i=0; i < ID_BLOCK_NIDS(tmp); i++ )
{
if ( ID_BLOCK_ID(tmp, i) == id )
{
SAFEMEMCPY(
&ID_BLOCK_ID(tmp, i),
&ID_BLOCK_ID(tmp, i+1),
(ID_BLOCK_NIDS(tmp)-(i+1)) * sizeof(ID));
ID_BLOCK_ID(tmp, ID_BLOCK_NIDS(tmp)-1 ) = NOID;
ID_BLOCK_NIDS(tmp)--;
if ( ID_BLOCK_NIDS(tmp) ) {
idl_store ( be, db, data, tmp );
} else {
bdb2i_cache_delete( db, data );
SAFEMEMCPY(
&ID_BLOCK_ID(idl, j),
&ID_BLOCK_ID(idl, j+1),
(nids-(j+1)) * sizeof(ID));
ID_BLOCK_ID(idl, nids-1) = NOID;
nids--;
if ( ! nids )
bdb2i_cache_delete( db, key );
else
idl_store( be, db, key, idl );
}
free( kstr );
return 0;
}
}
}
free( kstr );
return -1;
}
/* return a duplicate of a single ID_BLOCK */
static ID_BLOCK *
idl_dup( ID_BLOCK *idl )
{
ID_BLOCK *new;
if ( idl == NULL ) {
return( NULL );
}
new = bdb2i_idl_alloc( ID_BLOCK_NMAX(idl) );
SAFEMEMCPY(
(char *) new,
(char *) idl,
(ID_BLOCK_NMAX(idl) + ID_BLOCK_IDS_OFFSET) * sizeof(ID) );
return( new );
}
/* return the smaller ID_BLOCK */
static ID_BLOCK *
idl_min( ID_BLOCK *a, ID_BLOCK *b )
{
return( ID_BLOCK_NIDS(a) > ID_BLOCK_NIDS(b) ? b : a );
}
/*
* bdb2i_idl_intersection - return a intersection b
*/
ID_BLOCK *
bdb2i_idl_intersection(
BackendDB *be,
ID_BLOCK *a,
ID_BLOCK *b
)
{
unsigned int ai, bi, ni;
ID_BLOCK *n;
if ( a == NULL || b == NULL ) {
return( NULL );
}
if ( ID_BLOCK_ALLIDS( a ) ) {
return( idl_dup( b ) );
}
if ( ID_BLOCK_ALLIDS( b ) ) {
return( idl_dup( a ) );
}
n = idl_dup( idl_min( a, b ) );
for ( ni = 0, ai = 0, bi = 0; ai < ID_BLOCK_NIDS(a); ai++ ) {
for ( ;
bi < ID_BLOCK_NIDS(b) && ID_BLOCK_ID(b, bi) < ID_BLOCK_ID(a, ai);
bi++ )
{
; /* NULL */
}
if ( bi == ID_BLOCK_NIDS(b) ) {
break;
}
if ( ID_BLOCK_ID(b, bi) == ID_BLOCK_ID(a, ai) ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(a, ai);
}
}
if ( ni == 0 ) {
bdb2i_idl_free( n );
return( NULL );
}
ID_BLOCK_NIDS(n) = ni;
return( n );
}
/*
* bdb2i_idl_union - return a union b
*/
ID_BLOCK *
bdb2i_idl_union(
BackendDB *be,
ID_BLOCK *a,
ID_BLOCK *b
)
{
unsigned int ai, bi, ni;
ID_BLOCK *n;
if ( a == NULL ) {
return( idl_dup( b ) );
}
if ( b == NULL ) {
return( idl_dup( a ) );
}
if ( ID_BLOCK_ALLIDS( a ) || ID_BLOCK_ALLIDS( b ) ) {
return( bdb2i_idl_allids( be ) );
}
if ( ID_BLOCK_NIDS(b) < ID_BLOCK_NIDS(a) ) {
n = a;
a = b;
b = n;
}
n = bdb2i_idl_alloc( ID_BLOCK_NIDS(a) + ID_BLOCK_NIDS(b) );
for ( ni = 0, ai = 0, bi = 0;
ai < ID_BLOCK_NIDS(a) && bi < ID_BLOCK_NIDS(b);
)
{
if ( ID_BLOCK_ID(a, ai) < ID_BLOCK_ID(b, bi) ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(a, ai++);
} else if ( ID_BLOCK_ID(b, bi) < ID_BLOCK_ID(a, ai) ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(b, bi++);
} else {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(a, ai);
ai++, bi++;
}
}
for ( ; ai < ID_BLOCK_NIDS(a); ai++ ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(a, ai);
}
for ( ; bi < ID_BLOCK_NIDS(b); bi++ ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(b, bi);
}
ID_BLOCK_NIDS(n) = ni;
return( n );
}
/*
* bdb2i_idl_notin - return a intersection ~b (or a minus b)
*/
ID_BLOCK *
bdb2i_idl_notin(
BackendDB *be,
ID_BLOCK *a,
ID_BLOCK *b
)
{
unsigned int ni, ai, bi;
ID_BLOCK *n;
if ( a == NULL ) {
return( NULL );
}
if ( b == NULL || ID_BLOCK_ALLIDS( b )) {
return( idl_dup( a ) );
}
if ( ID_BLOCK_ALLIDS( a ) ) {
n = bdb2i_idl_alloc( SLAPD_LDBM_MIN_MAXIDS );
ni = 0;
for ( ai = 1, bi = 0;
ai < ID_BLOCK_NIDS(a) && ni < ID_BLOCK_NMAX(n) && bi < ID_BLOCK_NMAX(b);
ai++ )
{
if ( ID_BLOCK_ID(b, bi) == ai ) {
bi++;
} else {
ID_BLOCK_ID(n, ni++) = ai;
}
}
for ( ; ai < ID_BLOCK_NIDS(a) && ni < ID_BLOCK_NMAX(n); ai++ ) {
ID_BLOCK_ID(n, ni++) = ai;
}
if ( ni == ID_BLOCK_NMAX(n) ) {
bdb2i_idl_free( n );
return( bdb2i_idl_allids( be ) );
} else {
ID_BLOCK_NIDS(n) = ni;
return( n );
}
}
n = idl_dup( a );
ni = 0;
for ( ai = 0, bi = 0; ai < ID_BLOCK_NIDS(a); ai++ ) {
for ( ;
bi < ID_BLOCK_NIDS(b) && ID_BLOCK_ID(b, bi) < ID_BLOCK_ID(a, ai);
bi++ )
{
; /* NULL */
}
if ( bi == ID_BLOCK_NIDS(b) ) {
break;
}
if ( ID_BLOCK_ID(b, bi) != ID_BLOCK_ID(a, ai) ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(a, ai);
}
}
for ( ; ai < ID_BLOCK_NIDS(a); ai++ ) {
ID_BLOCK_ID(n, ni++) = ID_BLOCK_ID(a, ai);
}
ID_BLOCK_NIDS(n) = ni;
return( n );
}
/* return the first ID in the block
* if ALLIDS block
* NIDS > 1 return 1
* otherwise return NOID
* otherwise return first ID
*/
ID
bdb2i_idl_firstid( ID_BLOCK *idl )
{
if ( idl == NULL || ID_BLOCK_NIDS(idl) == 0 ) {
return( NOID );
}
if ( ID_BLOCK_ALLIDS( idl ) ) {
return( ID_BLOCK_NIDS(idl) > 1 ? 1 : NOID );
}
return( ID_BLOCK_ID(idl, 0) );
}
/* return next ID after id
* if ALLIDS block, increment id.
* if id < NIDS return id
* otherwise NOID.
* otherwise SEARCH for next id (ugh!)
*/
ID
bdb2i_idl_nextid( ID_BLOCK *idl, ID id )
{
unsigned int i;
if ( ID_BLOCK_ALLIDS( idl ) ) {
return( ++id < ID_BLOCK_NIDS(idl) ? id : NOID );
}
for ( i = 0; i < ID_BLOCK_NIDS(idl) && ID_BLOCK_ID(idl, i) <= id; i++ ) {
; /* NULL */
}
if ( i >= ID_BLOCK_NIDS(idl) ) {
return( NOID );
} else {
return( ID_BLOCK_ID(idl, i) );
}
}
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