sfxstr.c

   1 /*
   2  * Copyright (c) 2004 Teodor Sigaev <teodor@sigaev.ru>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *      notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *      notice, this list of conditions and the following disclaimer in the
  12  *      documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *      may be used to endorse or promote products derived from this software
  15  *      without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
  18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED. IN NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <stdint.h>
  33 #include <sys/types.h>
  34 #include <sys/file.h>
  35 #include <sys/uio.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38
  39 #include "tlog.h"
  40 #include "tmalloc.h"
  41 #include "sfxstr.h"
  42 #include "tools.h"
  43
  44 #define EN_VAL  0x01
  45 #define EN_CHLD 0x02
  46 #define EN_DATA 0x04
  47
  48 #define SFSTREE_VERSION         0x0100
  49
  50 typedef uintptr_t Opaque;  /* XXX sizeof(Opaque) == sizeof(void *) */
  51
  52 #define CHECK_MEMORY(tree)      ( ( (tree)->plainmemory ) ? \
  53         tlog(TL_CRIT|TL_EXIT, "Tree in plain memory - read only access") : (void)0 )
  54
  55 static __inline__ int
  56 getNodeSize(SFSTree *info, SFSNode *node) {
  57         int size =      SFSNHRDSZ;
  58
  59         if ( node->isskip ) {
  60                 if ( node->isword )
  61                         size += info->datasize;
  62                 if ( node->haschild )
  63                         size += sizeof(SFSNode*);
  64                 size += node->nchar;
  65         } else {
  66                 u_int32_t       i;
  67                 u_int32_t       nfound = 0;
  68                 SFSNodeData *data = node->data;
  69
  70                 size += sizeof(SFSNodeData) * node->nchar;
  71                 size += sizeof(SFSNode*) * node->nchild;
  72
  73                 for(i=0;i<node->nchar;i++)
  74                         nfound += data[i].isword;
  75
  76                 size += nfound*info->datasize;
  77         }
  78
  79         return PTRALIGN(size);
  80 }
  81
  82 static __inline__ SFSNode*
  83 getChildPointer(SFSTree *info, SFSNodeData *nodedata) {
  84         char *p = ((char*)nodedata) + nodedata->child;
  85
  86         if ( info->plainmemory )
  87                 return (SFSNode*) ( ((char*)(info->node)) + *(Opaque*)p );
  88
  89         return *(SFSNode**)p;
  90 }
  91
  92 static __inline__ SFSNode*
  93 getSkipChildPointer(SFSTree *info, SFSNode *node) {
  94         if ( info->plainmemory )
  95                 return (SFSNode*) ( ((char*)(info->node)) + *(Opaque*)node->data );
  96
  97         return *(SFSNode**)( (char*)(node->data) );
  98 }
  99
 100 static SFSNode* enlargeNode(SFSTree *info, SFSNode* node, u_int8_t val, int flag, SFSNodeData **nd);
 101 static SFSNode* addRecord(SFSTree *info, SFSNode* node, SFSDataIO *in, int level);
 102
 103 #define STRNCMP(p1,p2,n) ( ((n)==1) ? ( *((char*)(p1))==*((char*)(p2)) ) : (strncmp((char*)(p1), (char*)(p2), (n))==0) )
 104
 105 SFSTree*
 106 SFSInit_dp(SFSTree *info, u_int32_t datasize, SFSDataIO *in) {
 107         if ( datasize % sizeof(u_int32_t) )
 108                 tlog(TL_ALARM|TL_EXIT,"SFSInit_dp: datasize(%d) should be divided by sizeof(u_int32_t)", datasize);
 109
 110         if (!info)
 111                 info=(SFSTree*)tmalloc(sizeof(SFSTree));
 112         memset(info,0,sizeof(SFSTree));
 113
 114         info->datasize = datasize;
 115
 116         while(in && in->key) {
 117                 SFSAdd(info, in);
 118                 in++;
 119         }
 120
 121         return info;
 122 }
 123
 124 SFSTree*
 125 SFSInit_c(SFSTree *info, char **in) {
 126         char **ptr=in;
 127         SFSDataIO  d;
 128
 129         if (!info)
 130                 info=(SFSTree*)tmalloc(sizeof(SFSTree));
 131         memset(info,0,sizeof(SFSTree));
 132
 133         while(ptr && *ptr) {
 134                 d.key=*ptr;
 135                 d.keylen=0;
 136                 SFSAdd(info, &d);
 137                 ptr++;
 138         }
 139
 140         return info;
 141 }
 142
 143 #define ISEND(p,w,l)    ( (l>0) ? ( ((char*)(p))-(w) >= (l) ) : ( *(p) == '\0' ) )
 144
 145 void*
 146 SFSFindData(SFSTree *info, char *word, int len) {
 147         SFSDataIO       in;
 148
 149         in.key = word;
 150         in.keylen = len;
 151
 152         return SFSFindDataFromSavedOrSave(info, &in, NULL);
 153 }
 154
 155 void*
 156 SFSFindDataOrSave(SFSTree *info, SFSDataIO *in, SFSTreePosition *position) {
 157         if ( position )
 158                 memset(position, 0, sizeof(position));
 159
 160         return SFSFindDataFromSavedOrSave(info, in, position);
 161 }
 162
 163 void*
 164 SFSFindDataFromSavedOrSave(SFSTree *info, SFSDataIO *in, SFSTreePosition *position) {
 165         SFSNode *node = info->node;
 166         SFSNode **pnode = &(info->node);
 167         SFSNodeData *StopLow, *StopHigh, *StopMiddle;
 168         u_int8_t *ptr =(u_int8_t*)in->key;
 169
 170         if ( position && position->nodeptr && position->node && in->keylen > position->level ) {
 171                 node = position->node;
 172                 pnode = position->nodeptr;
 173                 ptr += position->level;
 174         }
 175
 176         while( node && !ISEND(ptr, in->key, in->keylen) ) {
 177                 if ( position ) {
 178                         position->nodeptr = pnode;
 179                         position->node = node;
 180                         position->level =  ((char*)ptr) - in->key;
 181                 }
 182
 183                 if ( node->isskip ) {
 184                         if ( in->keylen>0 &&  in->keylen - (((char*)ptr) - in->key) > node->nchar )
 185                                 return NULL;
 186                         else if ( STRNCMP(ptr, ((char*)node)+node->dataptr, node->nchar) ) {
 187                                 ptr+=node->nchar;
 188                                 if ( ISEND(ptr, in->key, in->keylen) && node->isword) {
 189                                         return (void*) ( ((char*)(node->data)) + ((node->haschild) ? sizeof(SFSNode*) : 0) );
 190                                 } else if ( node->haschild ) {
 191                                         node = getSkipChildPointer(info, node);
 192                                         pnode = (SFSNode**)( (char*)(node->data) );
 193                                 } else {
 194                                         return NULL;
 195                                 }
 196                         } else
 197                                 return NULL;
 198                 } else {
 199                         StopLow = node->data;
 200                         StopHigh = StopLow + node->nchar;
 201                         while (StopLow < StopHigh) {
 202                                 StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
 203                                 if ( StopMiddle->val == *ptr ) {
 204                                         ptr++;
 205                                         if ( ISEND(ptr, in->key, in->keylen) && StopMiddle->isword ) {
 206                                                 return (void*)( ((char*)node) + node->dataptr + info->datasize * StopMiddle->data );
 207                                         } else if ( StopMiddle->haschild ) {
 208                                                 node = getChildPointer(info, StopMiddle);
 209                                                 pnode = (SFSNode**)(((char*)StopMiddle) + StopMiddle->child);
 210                                         } else {
 211                                                 return NULL;
 212                                         }
 213                                         break;
 214                                 } else if ( StopMiddle->val < *ptr ) {
 215                                         StopLow = StopMiddle + 1;
 216                                 } else {
 217                                         StopHigh = StopMiddle;
 218                                 }
 219                         }
 220                         if ( StopLow >= StopHigh )
 221                                 return NULL;
 222                 }
 223         }
 224         return NULL;
 225 }
 226
 227 void
 228 SFSAddSaved(SFSTree *info, SFSDataIO *in, SFSTreePosition *position) {
 229         CHECK_MEMORY(info);
 230
 231         if ( !(position->nodeptr && position->node) ) {
 232                 SFSAdd(info, in);
 233                 return;
 234         }
 235
 236         position->node = *(position->nodeptr) = addRecord(info, position->node, in, position->level);
 237 }
 238
 239 static void
 240 freeFSFNode(SFSTree *info, SFSNode *node, void (*freefunc)(void*)) {
 241         u_int32_t i;
 242
 243         if ( node->isskip ) {
 244                 if (node->haschild)
 245                         freeFSFNode(info, *(SFSNode**)(node->data), freefunc);
 246                 if (freefunc && node->isword && info->datasize)
 247                         (*freefunc)( (void*)( ((char*)(node->data))+ (node->haschild) ? sizeof(SFSNode*) : 0 ) );
 248         } else {
 249                 SFSNodeData *nd = node->data;
 250                 char *data= ((char*)node) + node->dataptr;
 251
 252                 for(i=0;i<node->nchar;i++) {
 253                         if (nd->haschild)
 254                                 freeFSFNode(info, *(SFSNode**)( ((char*)nd) + nd->child ), freefunc);
 255                         if (freefunc && nd->isword && info->datasize) {
 256                                 (*freefunc)( (void*)data );
 257                                 data+=info->datasize;
 258                         }
 259                         nd++;
 260                 }
 261         }
 262
 263         tfree(node);
 264 }
 265
 266 void
 267 SFSFree(SFSTree *info, void (*freefunc)(void*)) {
 268         SFSNodeStack *s=info->stack;
 269
 270         if (info->node && !info->plainmemory) freeFSFNode(info, info->node, freefunc);
 271         if (info->buf) tfree(info->buf);
 272         info->buf = NULL;
 273         info->tlen=0;
 274         info->node = NULL;
 275
 276         while(s) {
 277                 info->stack=s->next;
 278                 tfree(s);
 279                 s=info->stack;
 280         }
 281 }
 282
 283 static SFSNode*
 284 makeSkipNode(SFSTree *info, SFSDataIO *io, int level) {
 285         u_int32_t len;
 286         int size;
 287         SFSNode *res;
 288
 289         io->key+=level;
 290         io->keylen-=level;
 291
 292         len = (io->keylen > 255) ? 255 : io->keylen;
 293         size = SFSNHRDSZ + ((io->keylen > 255) ? sizeof(SFSNode*) : info->datasize) + len;
 294         size = PTRALIGN(size);
 295
 296         res = (SFSNode*)tmalloc(size);
 297         info->nnodes++;
 298         info->totalen+=size;
 299
 300         res->isskip=1;
 301         res->nchar=len;
 302         res->dataptr = SFSNHRDSZ + ((io->keylen > 255) ? sizeof(SFSNode*) : info->datasize);
 303         memcpy(((char*)res) + res->dataptr, io->key, len);
 304
 305         if ( io->keylen > 255 ) {
 306                 res->haschild=1;
 307                 res->isword=0;
 308                 io->key = io->key+len;
 309                 io->keylen = io->keylen - len;
 310                 *(SFSNode**)(res->data) = makeSkipNode(info, io, 0);
 311                 io->key = io->key-len;
 312                 io->keylen = io->keylen + len;
 313         } else {
 314                 res->haschild=0;
 315                 res->isword=1;
 316                 if (info->datasize) {
 317                         memcpy( res->data, io->data, info->datasize );
 318                 }
 319         }
 320
 321         io->key-=level;
 322         io->keylen+=level;
 323
 324         return res;
 325 }
 326
 327 static SFSNode*
 328 splitSkipNode(SFSTree *info, SFSNode* node, SFSDataIO *io, int level) {
 329         SFSNode *res;
 330         int prefixlen=0;
 331         char *s1,*s2;
 332         SFSNodeData     *ndata;
 333
 334         tassert(node->isskip);
 335         io->key+=level;
 336         io->keylen-=level;
 337
 338         s1=((char*)node) + node->dataptr;
 339         s2=io->key;
 340
 341         while( s1 - (((char*)node) + node->dataptr) < node->nchar && s2 - io->key < io->keylen && *s1==*s2) {
 342                 s1++;
 343                 s2++;
 344         }
 345
 346         prefixlen = s2 - io->key;
 347
 348         if ( prefixlen==0 ) {
 349                 if ( node->nchar == 1 ) {
 350                         int flag = EN_VAL | ((node->isword) ? EN_DATA : 0) | ((node->haschild) ? EN_CHLD : 0);
 351                         res = enlargeNode(info, NULL, *(u_int8_t*)(((char*)node) + node->dataptr), flag, &ndata);
 352                         if ( node->isword ) {
 353                                 if ( info->datasize )
 354                                         memcpy(
 355                                                 ((char*)res) + res->dataptr + info->datasize * ndata->data,
 356                                                 ((char*)(node->data)) + ((node->haschild) ? sizeof(SFSNode*) : 0),
 357                                                 info->datasize
 358                                         );
 359                         }
 360                         if ( node->haschild )
 361                                 *(SFSNode**)( ((char*)ndata) + ndata->child ) = *(SFSNode**)( node->data );
 362                         info->totalen -= getNodeSize(info, node);
 363                         info->nnodes--;
 364                         tfree(node);
 365                 } else {
 366                         int size;
 367
 368                         res = enlargeNode(info, NULL, *(u_int8_t*)(((char*)node) + node->dataptr), EN_VAL|EN_CHLD, &ndata);
 369
 370                         size = getNodeSize(info,node);
 371                         info->totalen-=size;
 372
 373                         node->nchar--;
 374                         memmove( ((char*)node) + node->dataptr, ((char*)node) + node->dataptr + 1, node->nchar);
 375
 376                         size = getNodeSize(info,node);
 377                         info->totalen+=size;
 378
 379                         *(SFSNode**)( ((char*)ndata) + ndata->child ) = (SFSNode*)trealloc(node, size);
 380                 }
 381                 res = addRecord(info, res, io, 0);
 382         } else if (prefixlen==io->keylen) {
 383                 if (prefixlen==node->nchar) {
 384                         if ( node->isword || info->datasize==0) {
 385                                 if (info->datasize)
 386                                         memcpy( ((char*)(node->data)) + ((node->haschild) ? sizeof(SFSNodeData*) : 0),
 387                                                 io->data,
 388                                                 info->datasize);
 389                                 node->isword=1;
 390                                 res=node;
 391                         } else {
 392                                 int osize = PTRALIGN(SFSNHRDSZ + ((node->haschild) ? sizeof(SFSNodeData*) : 0) + node->nchar);
 393                                 int nsize = PTRALIGN(SFSNHRDSZ + info->datasize + ((node->haschild) ? sizeof(SFSNodeData*) : 0) + node->nchar);
 394
 395                                 info->totalen += nsize - osize;
 396
 397                                 res=(SFSNode*)trealloc(node,nsize);
 398                                 res->dataptr=SFSNHRDSZ + info->datasize + ((res->haschild) ? sizeof(SFSNodeData*) : 0);
 399                                 res->isword=1;
 400                                 memmove(((char*)res) + res->dataptr,
 401                                         ((char*)(res->data))  + ((res->haschild) ? sizeof(SFSNodeData*) : 0), res->nchar);
 402                                 memcpy(((char*)(res->data))  + ((res->haschild) ? sizeof(SFSNodeData*) : 0), io->data, info->datasize);
 403                         }
 404                 } else {
 405                         int size = SFSNHRDSZ + info->datasize + sizeof(SFSNodeData*) + prefixlen;
 406                         size = PTRALIGN(size);
 407
 408                         info->totalen+=size;
 409                         info->nnodes++;
 410                         res = (SFSNode*)tmalloc(size);
 411                         res->isskip=1;
 412                         res->isword=1;
 413                         res->haschild=1;
 414                         res->nchar = prefixlen;
 415                         res->dataptr = SFSNHRDSZ + info->datasize + sizeof(SFSNodeData*);
 416                         memcpy(((char*)res)+res->dataptr, io->key, prefixlen);
 417                         if (info->datasize)
 418                                 memcpy(((char*)(res->data)) + sizeof(SFSNodeData*), io->data, info->datasize);
 419                         info->totalen-=getNodeSize(info,node);
 420                         node->nchar-=prefixlen;
 421                         memmove( ((char*)node) + node->dataptr, ((char*)node) + node->dataptr + prefixlen, node->nchar);
 422                         size = getNodeSize(info,node);
 423                         info->totalen+=size;
 424                         *(SFSNode**)(res->data) = (SFSNode*)trealloc(node, size);
 425                 }
 426         } else if ( prefixlen==node->nchar ) {
 427                 int size = SFSNHRDSZ + info->datasize +  sizeof(SFSNode*) + node->nchar;
 428                 info->totalen+=sizeof(SFSNode*);
 429                 res=(SFSNode*)trealloc(node,size);
 430                 memmove( ((char*)(res->data)) + sizeof(SFSNode*), res->data, info->datasize + res->nchar);
 431                 res->haschild=1;
 432                 res->dataptr+=sizeof(SFSNode*);
 433                 *(SFSNode**)(res->data) = makeSkipNode(info, io, prefixlen);
 434         } else {
 435                 int size = SFSNHRDSZ + sizeof(SFSNodeData*) + prefixlen;
 436                 size = PTRALIGN(size);
 437                 info->totalen+=size;
 438                 info->nnodes++;
 439                 res = (SFSNode*)tmalloc(size);
 440                 res->isskip=1;
 441                 res->isword=0;
 442                 res->haschild=1;
 443                 res->nchar = prefixlen;
 444                 res->dataptr = SFSNHRDSZ + sizeof(SFSNodeData*);
 445                 memcpy(((char*)res)+res->dataptr, io->key, prefixlen);
 446
 447                 info->totalen-= getNodeSize(info,node);
 448                 node->nchar-=prefixlen;
 449
 450                 memmove( ((char*)node) + node->dataptr, ((char*)node) + node->dataptr + prefixlen, node->nchar);
 451
 452                 size = getNodeSize(info,node);
 453                 info->totalen+= size;
 454
 455                 *(SFSNode**)(res->data) = (SFSNode*)trealloc(node, size);
 456                 *(SFSNode**)(res->data) = splitSkipNode(info, *(SFSNode**)(res->data), io, prefixlen);
 457         }
 458
 459         io->key-=level;
 460         io->keylen+=level;
 461         return res;
 462 }
 463
 464
 465 static SFSNode*
 466 enlargeNode(SFSTree *info, SFSNode* node, u_int8_t val, int flag, SFSNodeData **nd) {
 467         u_int32_t nchild=0, nchar=0, nfound=0, i;
 468         SFSNode *rs,**chld;
 469         SFSNodeData *data;
 470         int sizenode;
 471         char *dataptr;
 472
 473
 474         if ( node ) {
 475                 nchar=node->nchar;
 476                 nchild=node->nchild;
 477                 data=node->data;
 478
 479                 for(i=0;i<nchar;i++) {
 480                         nfound += data->isword;
 481                         data++;
 482                 }
 483         }
 484
 485         if ( node )
 486                 /*info->totalen -= PTRALIGN(SFSNHRDSZ+nchar*sizeof(SFSNodeData)+nchild*sizeof(SFSNode*)+nfound*info->datasize);*/
 487                 info->totalen -= getNodeSize(info, node);
 488
 489         if ( flag & EN_VAL )   nchar++;
 490         if ( flag & EN_CHLD ) nchild++;
 491         if ( flag & EN_DATA )  nfound++;
 492
 493
 494         sizenode = SFSNHRDSZ+nchar*sizeof(SFSNodeData)+nchild*sizeof(SFSNode*)+nfound*info->datasize;
 495         sizenode = PTRALIGN(sizenode);
 496
 497         info->totalen+=sizenode;
 498         if ( !node ) info->nnodes++;
 499         rs=(SFSNode*)tmalloc(sizenode);
 500
 501         rs->isskip = 0;
 502         rs->nchar = nchar;
 503         rs->nchild = nchild;
 504         rs->dataptr=SFSNHRDSZ+nchar*sizeof(SFSNodeData)+nchild*sizeof(SFSNode*);
 505         dataptr=((char*)rs) + rs->dataptr;
 506         chld = (SFSNode**)( ((char*)rs)+SFSNHRDSZ+nchar*sizeof(SFSNodeData) );
 507         data=rs->data;
 508
 509         if (node) {
 510                 SFSNode **ochld=(SFSNode**)( ((char*)node)+SFSNHRDSZ+node->nchar*sizeof(SFSNodeData) );
 511                 SFSNodeData *odata = node->data;
 512                 char *odataptr=((char*)node) + node->dataptr;
 513                 int wasins=0;
 514
 515                 for(i=0;i<node->nchar;i++) {
 516                         if ( val > odata->val ) {
 517                                 *(u_int32_t*)data = *(u_int32_t*)odata;
 518                                 if ( odata->haschild ) {
 519                                         *chld=*ochld;
 520                                         data->child = ((char*)chld) - ((char*)data);
 521                                         chld++; ochld++;
 522                                 }
 523                                 if ( odata->isword && info->datasize ) {
 524                                         memcpy(dataptr, odataptr, info->datasize);
 525                                         data->data = ((dataptr - ((char*)rs)) - rs->dataptr)/info->datasize;
 526                                         dataptr += info->datasize; odataptr += info->datasize;
 527                                 }
 528                                 data++; odata++;
 529                         } else if ( val == odata->val ) {
 530                                 tassert ( (flag&EN_VAL)==0 );
 531                                 *(u_int32_t*)data = *(u_int32_t*)odata;
 532                                 wasins=1;
 533                                 if ( odata->haschild || flag & EN_CHLD ) {
 534                                         if (odata->haschild) *chld=*ochld;
 535                                         data->child = ((char*)chld) - ((char*)data);
 536                                         data->haschild=1;
 537                                         chld++; if (odata->haschild) ochld++;
 538                                 } else
 539                                         data->haschild=0;
 540                                 if ( odata->isword || flag & EN_DATA ) {
 541                                         data->isword=1;
 542                                         if ( info->datasize && odata->isword ) {
 543                                                 memcpy(dataptr, odataptr, info->datasize);
 544                                                 odataptr += info->datasize;
 545                                         }
 546                                         data->data = ( info->datasize ) ? ((dataptr - ((char*)rs)) - rs->dataptr)/info->datasize : 0;
 547                                         dataptr += info->datasize;
 548                                 } else
 549                                         data->isword=0;
 550                                 *nd = data;
 551                                 data++; odata++;
 552                         } else {
 553                                 if ( wasins==0 ) {
 554                                         tassert ( flag&EN_VAL );
 555                                         data->val = val;
 556                                         if ( flag & EN_CHLD ) {
 557                                                 data->haschild=1;
 558                                                 data->child = ((char*)chld) - ((char*)data);
 559                                                 chld++;
 560                                         } else
 561                                                 data->haschild=0;
 562                                         if ( flag & EN_DATA ) {
 563                                                 data->isword=1;
 564                                                 data->data = ( info->datasize ) ? ((dataptr - ((char*)rs)) - rs->dataptr)/info->datasize : 0;
 565                                                 dataptr += info->datasize;
 566                                         } else
 567                                                 data->isword=0;
 568                                         *nd = data;
 569                                         data++;
 570                                         wasins=1;
 571                                         i--;
 572                                 } else {
 573                                         *(u_int32_t*)data = *(u_int32_t*)odata;
 574                                         if ( odata->haschild ) {
 575                                                 *chld=*ochld;
 576                                                 data->child = ((char*)chld) - ((char*)data);
 577                                                 chld++; ochld++;
 578                                         }
 579                                         if ( odata->isword && info->datasize ) {
 580                                                 memcpy(dataptr, odataptr, info->datasize);
 581                                                 data->data = ((dataptr - ((char*)rs)) - rs->dataptr)/info->datasize;
 582                                                 dataptr += info->datasize; odataptr += info->datasize;
 583                                         }
 584                                         data++; odata++;
 585                                 }
 586                         }
 587                 }
 588                 if ( wasins==0 ) {
 589                         tassert ( flag&EN_VAL );
 590                         data->val = val;
 591                         if ( flag & EN_CHLD ) {
 592                                 data->haschild=1;
 593                                 data->child = ((char*)chld) - ((char*)data);
 594                                 chld++;
 595                         } else
 596                                 data->haschild=0;
 597                         if ( flag & EN_DATA ) {
 598                                 data->isword=1;
 599                                 data->data = ( info->datasize ) ? ((dataptr - ((char*)rs)) - rs->dataptr)/info->datasize : 0;
 600                                 dataptr += info->datasize;
 601                         } else
 602                                 data->isword=0;
 603                         *nd = data;
 604                 }
 605         } else {
 606                 tassert ( flag & EN_VAL );
 607                 data->val = val;
 608                 if ( flag & EN_CHLD ) {
 609                         data->haschild=1;
 610                         data->child = ((char*)chld) - ((char*)data);
 611                 } else
 612                         data->haschild=0;
 613                 if ( flag & EN_DATA ) {
 614                         data->isword=1;
 615                         data->data = ( info->datasize ) ? ((dataptr - ((char*)rs)) - rs->dataptr)/info->datasize : 0;
 616                 } else
 617                         data->isword=0;
 618                 *nd = data;
 619         }
 620         if (node) tfree(node);
 621         return rs;
 622 }
 623
 624 static SFSNode*
 625 addRecord(SFSTree *info, SFSNode* node, SFSDataIO *in, int level) {
 626         SFSNodeData *StopLow, *StopHigh, *StopMiddle;
 627         u_int8_t *ptr = ((u_int8_t*)in->key) + level;
 628
 629         if ( node ) {
 630                 if ( node->isskip ) {
 631                         if ( node->haschild && in->keylen-level > node->nchar &&
 632                                         strncmp(in->key+level, ((char*)node)+node->dataptr, node->nchar)==0 )
 633                                 *(SFSNode**)( node->data ) = addRecord(info, *(SFSNode**)( node->data ), in, level+node->nchar);
 634                         else
 635                                 node = splitSkipNode(info, node, in, level);
 636                 } else {
 637                 StopLow = node->data;
 638                         StopHigh = StopLow + node->nchar;
 639                         while (StopLow < StopHigh) {
 640                                 StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
 641                         if ( StopMiddle->val == *ptr ) {
 642                                         if ( *(ptr+1)=='\0' ) {
 643                                                 if ( StopMiddle->isword ) {
 644                                                         /* already exists */
 645                                                         if ( info->datasize )
 646                                                                 memcpy(((char*)node) + node->dataptr + info->datasize * StopMiddle->data,
 647                                                                         in->data, info->datasize );
 648                                                 } else {
 649                                                         /* not exist word */
 650                                                         if (info->datasize) {
 651                                                                 node = enlargeNode(info, node, *ptr, EN_DATA, &StopMiddle);
 652                                                                 memcpy(((char*)node) + node->dataptr + info->datasize * StopMiddle->data,
 653                                                                         in->data, info->datasize );
 654                                                         }
 655                                                         StopMiddle->isword = 1;
 656                                                 }
 657                                         } else if ( StopMiddle->haschild ) {
 658                                                 *(SFSNode**)( ((char*)StopMiddle) + StopMiddle->child ) =
 659                                                         addRecord(info, *(SFSNode**)( ((char*)StopMiddle) + StopMiddle->child ), in, level+1);
 660                                         } else {
 661                                                 node = enlargeNode(info, node, *ptr, EN_CHLD, &StopMiddle);
 662                                                 *(SFSNode**)( ((char*)StopMiddle) + StopMiddle->child ) =
 663                                                         makeSkipNode(info, in, level+1);
 664                                         }
 665                                         return node;
 666                                 } else if ( StopMiddle->val < *ptr ) {
 667                                         StopLow = StopMiddle + 1;
 668                                 } else {
 669                                         StopHigh = StopMiddle;
 670                                 }
 671                         }
 672                         if ( *(ptr+1)=='\0' ) {
 673                                 node = enlargeNode(info, node, *ptr, EN_VAL|EN_DATA, &StopMiddle);
 674                                 if ( info->datasize )
 675                                         memcpy(((char*)node) + node->dataptr + info->datasize * StopMiddle->data,
 676                                         in->data, info->datasize );
 677                         } else {
 678                                 node = enlargeNode(info, node, *ptr, EN_VAL|EN_CHLD, &StopMiddle);
 679                                 *(SFSNode**)( ((char*)StopMiddle) + StopMiddle->child ) =
 680                                         makeSkipNode(info, in, level+1);
 681                         }
 682                 }
 683         } else
 684                 node = makeSkipNode(info, in, level);
 685
 686         return node;
 687
 688 }
 689
 690 void
 691 SFSAdd(SFSTree *info, SFSDataIO *in) {
 692         CHECK_MEMORY(info);
 693         if (in->keylen<=0)
 694                 in->keylen=strlen(in->key);
 695         info->node = addRecord(info, info->node, in, 0);
 696 }
 697
 698 static SFSNodeStack*
 699 pushStack(SFSNodeStack *top, SFSNode *node, int level ) {
 700         SFSNodeStack *r=(SFSNodeStack*)tmalloc(sizeof(SFSNodeStack));
 701
 702         r->next = top;
 703         r->node=node;
 704         r->data=node->data;
 705         r->level=level;
 706         r->checkedchild = 0;
 707         r->checkedval = 0;
 708
 709         return r;
 710 }
 711
 712 void
 713 SFSIteratorStart(SFSTree *info) {
 714         if ( !info->buf ) {
 715                 info->tlen = 32;
 716                 info->buf = (char*)tmalloc(info->tlen);
 717         }
 718         info->stack = pushStack(NULL, info->node, 0);
 719         info->hasword=0;
 720 }
 721
 722 void
 723 SFSPrefixIteratorStart(SFSTree *info, char *word) {
 724         SFSNode *node = info->node;
 725         SFSNodeData *StopLow, *StopHigh, *StopMiddle;
 726         u_int8_t *ptr =(u_int8_t*)word;
 727         int len,wlen=strlen(word);
 728
 729         if ( wlen+1>=info->tlen ) {
 730                 info->tlen = 2*wlen;
 731                 info->buf = (info->buf) ?
 732                                 (char*)trealloc(info->buf,info->tlen)
 733                         :
 734                                 (char*)tmalloc(info->tlen);
 735         }
 736
 737         info->hasword=0;
 738         while( node && *ptr) {
 739                 len = wlen - (((char*)ptr)-word);
 740                 if ( node->isskip ) {
 741                         if ( STRNCMP(ptr, ((char*)node)+node->dataptr, (len<node->nchar) ? len : node->nchar) ) {
 742                                 if ( len<=node->nchar ) {
 743                                         strcpy(info->buf,word);
 744                                         info->stack = pushStack(NULL, node, ((char*)ptr) - word);
 745                                         return;
 746                                 } else if ( node->haschild ) {
 747                                         ptr+=node->nchar;
 748                                         node = getSkipChildPointer(info, node);
 749                                 } else {
 750                                         return;
 751                                 }
 752                         } else
 753                                 return;
 754                 } else {
 755                         StopLow = node->data;
 756                         StopHigh = StopLow + node->nchar;
 757                         while (StopLow < StopHigh) {
 758                                 StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
 759                                 if ( StopMiddle->val == *ptr ) {
 760                                         if ( *(ptr+1)=='\0' ) {
 761                                                 len =((char*)ptr)-word+1;
 762                                                 strcpy(info->buf,word);
 763                                                 if ( StopMiddle->isword ) {
 764                                                         info->hasword=1;
 765                                                         info->wdata = (void*)( ((char*)node) + node->dataptr + info->datasize * StopMiddle->data );
 766                                                 }
 767                                                 if ( StopMiddle->haschild )
 768                                                         info->stack = pushStack(NULL, getChildPointer( info, StopMiddle ), len);
 769                                                 return;
 770                                         } else if ( StopMiddle->haschild ) {
 771                                                 node = getChildPointer( info, StopMiddle );
 772                                         } else {
 773                                                 return;
 774                                         }
 775                                         ptr++;
 776                                         break;
 777                                 } else if ( StopMiddle->val < *ptr ) {
 778                                         StopLow = StopMiddle + 1;
 779                                 } else {
 780                                         StopHigh = StopMiddle;
 781                                 }
 782                         }
 783                         if ( StopLow >= StopHigh )
 784                                 break;
 785                 }
 786         }
 787         return;
 788 }
 789
 790 int
 791 SFSIterate(SFSTree *info, SFSDataIO *out) {
 792         SFSNodeStack *s=info->stack;
 793
 794         if ( info->hasword ) {
 795                 out->key = info->buf;
 796                 out->keylen = strlen(out->key);
 797                 out->data = info->wdata;
 798                 info->hasword = 0;
 799                 return 1;
 800         }
 801
 802         if ( s == NULL || s->node == NULL)
 803                 return 0;
 804
 805         while ( s->level + s->node->nchar + 1 >= info->tlen ) {
 806                 info->tlen *= 2;
 807                 info->buf = (char*)trealloc(info->buf, info->tlen);
 808         }
 809
 810         if ( s->node->isskip ) {
 811                 memcpy( info->buf + s->level, ((char*)s->node) + s->node->dataptr, s->node->nchar );
 812                 if ( s->node->isword && !s->checkedval) {
 813                         info->buf[ s->level+s->node->nchar ] = '\0';
 814                         out->key = info->buf;
 815                         out->keylen = s->level+s->node->nchar;
 816                         out->data =((char*)(s->node->data)) + ((s->node->haschild) ? sizeof(SFSNode*) : 0);
 817                         s->checkedval=1;
 818                         return 1;
 819                 }
 820                 if ( s->node->haschild && !s->checkedchild) {
 821                         info->stack = pushStack(s, getSkipChildPointer(info, s->node), s->level+s->node->nchar);
 822                         s->checkedchild=1;
 823                         if ( SFSIterate(info, out) )
 824                                 return 1;
 825                 }
 826         } else {
 827                 while( s->data - s->node->data < s->node->nchar ) {
 828                         info->buf[ s->level ] = (char)s->data->val;
 829                         if ( s->checkedval==0 && s->data->isword ) {
 830                                 info->buf[ s->level+1 ] = '\0';
 831                                 out->key = info->buf;
 832                                 out->keylen = s->level+1;
 833                                 out->data =((char*)s->node) + s->node->dataptr + info->datasize * s->data->data;
 834                                 s->checkedval = 1;
 835                                 return 1;
 836                         }
 837                         if ( s->checkedchild==0 && s->data->haschild ) {
 838                                 info->stack = pushStack(s,
 839                                         getChildPointer( info, s->data ), s->level+1);
 840                                 s->checkedchild=1;
 841                                 if ( SFSIterate(info, out) )
 842                                         return 1;
 843                         }
 844                         s->checkedval = s->checkedchild = 0;
 845                         s->data++;
 846                 }
 847         }
 848         info->stack = s->next;
 849         tfree(s);
 850
 851         return SFSIterate(info, out);
 852 }
 853
 854 int
 855 SFSRange(SFSTree *info, char *word, SFSDataIO *f, SFSDataIO *l) {
 856         SFSNodeStack *s=info->stack;
 857
 858         SFSPrefixIteratorStart(info, word);
 859         s=info->stack;
 860
 861         if ( SFSIterate(info, f) ) {
 862                 SFSNodeStack *sptr = info->stack, *stmp;
 863                 while( sptr && sptr!=s ) {
 864                         stmp=sptr->next;
 865                         tfree(sptr);
 866                         sptr=stmp;
 867                 }
 868
 869                 if ( s == NULL ) {
 870                         memcpy(l,f,sizeof(SFSDataIO));
 871                         return 1;
 872                 }
 873         } else
 874                 return 0;
 875
 876         info->stack=NULL;
 877
 878         while( f->keylen +  s->level + 2 >= info->tlen ) {
 879                 info->tlen *= 2;
 880                 info->buf = (char*)trealloc(info->buf, info->tlen);
 881         }
 882
 883         f->key = info->buf;
 884         l->key = info->buf + f->keylen + 1;
 885         memcpy(l->key, f->key, f->keylen + 1);
 886
 887         while(s->node) {
 888                 while( f->keylen + 1 + s->level + s->node->nchar + 1 >= info->tlen ) {
 889                         info->tlen *= 2;
 890                         info->buf = (char*)trealloc(info->buf, info->tlen);
 891                 }
 892                 if ( s->node->isskip ) {
 893                         memcpy(info->buf + f->keylen + 1 + s->level,
 894                                 ((char*)(s->node))+s->node->dataptr, s->node->nchar);
 895                         s->level+=s->node->nchar;
 896                         if (s->node->haschild) {
 897                                 s->node=getSkipChildPointer(info, s->node);
 898                         } else { /* if (s->node->isword) */
 899                                 info->buf[ f->keylen + 1 + s->level  ] = '\0';
 900                                 l->data = (void*)(s->node->data);
 901                                 l->keylen = s->level+1;
 902                                 break;
 903                         }
 904                 } else {
 905                         s->data = s->node->data + s->node->nchar - 1;
 906                         while( s->data - s->node->data >= 0 ) {
 907                                 info->buf[ f->keylen + 1 + s->level ] = (char)s->data->val;
 908                                 if ( s->data->haschild ) {
 909                                         s->node = getChildPointer( info, s->data );
 910                                         s->level++;
 911                                         break;
 912                                 }
 913                                 if ( s->data->isword ) {
 914                                         info->buf[ f->keylen + 1 + s->level ] = '\0';
 915                                         l->keylen = s->level+1;
 916                                         l->data =((char*)s->node) + s->node->dataptr + info->datasize * s->data->data;
 917                                         s->node=NULL;
 918                                         break;
 919                                 }
 920                                 s->data--;
 921                         }
 922                 }
 923         }
 924         f->key = info->buf;
 925         l->key = info->buf + f->keylen + 1;
 926         tfree(s);
 927
 928         return 1;
 929 }
 930
 931 typedef struct WorkPlain {
 932         SFSTree                 *info;
 933         char                    *node;
 934         off_t                   offset;
 935 } WorkPlain;
 936
 937 static Opaque
 938 plainNode(WorkPlain *wp, SFSNode *node) {
 939         int     size = getNodeSize(wp->info, node);
 940         off_t   myoffset = wp->offset;
 941
 942         memcpy( wp->node + wp->offset, node, size );
 943         wp->offset += size;
 944
 945         tassert( wp->offset <= wp->info->totalen );
 946
 947         if ( node->isskip ) {
 948                 if (node->haschild)
 949                         *(Opaque*)(wp->node + myoffset + SFSNHRDSZ) =
 950                                         plainNode(wp, getSkipChildPointer(wp->info, node));
 951         } else {
 952                 SFSNodeData *nd = node->data;
 953                 u_int32_t       i;
 954
 955                 for(i=0;i<node->nchar;i++) {
 956                         if (nd->haschild)
 957                                 *(Opaque*)(wp->node + myoffset + ( ((char*)nd) - ((char*)node) ) + nd->child) =
 958                                                 plainNode(wp, getChildPointer( wp->info, nd ) );
 959                         nd++;
 960                 }
 961         }
 962
 963         tfree(node);
 964
 965         return myoffset;
 966 }
 967
 968 void
 969 SFSMakePlain(SFSTree *info, void *pointer) {
 970         WorkPlain       wp;
 971
 972         if ( info->plainmemory )
 973                 return;
 974
 975         wp.info = info;
 976         wp.offset = 0;
 977         if ( pointer )
 978                 wp.node = (char*)pointer;
 979         else
 980                 wp.node = (char*)tmalloc(sizeof(char*) * info->totalen);
 981
 982         plainNode(&wp, info->node);
 983         tassert( wp.offset == info->totalen );
 984
 985         info->node = (SFSNode*)wp.node;
 986         info->plainmemory = 1;
 987 }
 988
 989 static SFSNode*
 990 revertNode(SFSTree *info, SFSNode* node) {
 991         int size = getNodeSize(info, node);
 992         SFSNode *newnode;
 993
 994         newnode = (SFSNode*)tmalloc( size );
 995         memcpy(newnode, node, size);
 996
 997         if ( node->isskip ) {
 998                 if (node->haschild)
 999                         *(SFSNode**)( (char*)(newnode->data) ) =
1000                                 revertNode(info, getSkipChildPointer(info, node));
1001         } else {
1002                 SFSNodeData *nd = node->data;
1003                 SFSNodeData *nnd = newnode->data;
1004                 u_int32_t   i;
1005
1006                 for(i=0;i<node->nchar;i++) {
1007                         if (nd->haschild)
1008                                 *(SFSNode**) (((char*)nnd) + nnd->child ) =
1009                                         revertNode(info, getChildPointer( info, nd ));
1010                         nd++; nnd++;
1011                 }
1012         }
1013
1014         return newnode;
1015 }
1016
1017 void *
1018 SFSRevertPlain(SFSTree *info) {
1019         void *pointer = info->node;
1020
1021         if (! info->plainmemory )
1022                 return NULL;
1023
1024         info->node = revertNode(info, info->node);
1025         info->plainmemory = 0;
1026
1027         return pointer;
1028 }
1029
1030 static Opaque
1031 writeNode(WorkPlain *wp, int fd, SFSNode *node, u_int32_t extrasize) {
1032         int     size = getNodeSize(wp->info, node);
1033         SFSNode  *wnode = (SFSNode*)tmalloc(size);
1034         off_t   myoffset = wp->offset;
1035
1036         memcpy( wnode, node, size );
1037         wp->offset += size;
1038
1039         tassert( wp->offset <= wp->info->totalen );
1040
1041         if ( node->isskip ) {
1042                 if (node->haschild)
1043                         *(Opaque*)( ((char*)wnode) + SFSNHRDSZ) =
1044                                         writeNode(wp, fd, getSkipChildPointer(wp->info, node), extrasize);
1045         } else {
1046                 SFSNodeData *nd = node->data;
1047                 u_int32_t       i;
1048
1049                 for(i=0;i<node->nchar;i++) {
1050                         if (nd->haschild)
1051                                 *(Opaque*)(((char*)wnode) + ( ((char*)nd) - ((char*)node) ) + nd->child) =
1052                                                 writeNode(wp, fd, getChildPointer( wp->info, nd ), extrasize );
1053                         nd++;
1054                 }
1055         }
1056
1057         if ( lseek(fd, myoffset + SFSTDHSZ + extrasize, SEEK_SET) < 0 )
1058                 tlog(TL_CRIT|TL_EXIT, "lseek failed: %s", strerror(errno));
1059         if ( write(fd, wnode, size) != size )
1060                 tlog(TL_CRIT|TL_EXIT, "write failed: %s", strerror(errno));
1061
1062         tfree(wnode);
1063
1064         return myoffset;
1065 }
1066
1067 void
1068 SFSWriteDump(SFSTree *info, char *filename, void *extradata, u_int32_t extrasize) {
1069         int                             fd;
1070         off_t                           size = info->totalen + SFSTDHSZ;
1071         SFSTreeDumpHeader       dh;
1072
1073         if ( (fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0 )
1074                 tlog(TL_CRIT|TL_EXIT, "Can not open file '%s': %s", filename, strerror(errno));
1075
1076         if ( flock(fd, LOCK_EX) < 0 )
1077                 tlog(TL_CRIT|TL_EXIT, "flock failed: %s", strerror(errno));
1078
1079         if ( extrasize == 0 )
1080                 extradata = NULL;
1081         else if ( extradata == NULL )
1082                 extrasize = 0;
1083
1084         if ( lseek(fd, size + MAXALIGN(extrasize) , SEEK_SET) < 0 )
1085                 tlog(TL_CRIT|TL_EXIT, "lseek failed: %s", strerror(errno));
1086
1087         dh.version = SFSTREE_VERSION;
1088         dh.opaquesize = sizeof(Opaque);
1089         dh.headersize = SFSTDHSZ;
1090         dh.datasize = info->datasize;
1091         dh.totalen = info->totalen;
1092         dh.nnodes = info->nnodes;
1093         dh.extrasize = extrasize;
1094
1095         if ( lseek(fd, 0, SEEK_SET) < 0 )
1096                 tlog(TL_CRIT|TL_EXIT, "lseek failed: %s", strerror(errno));
1097         if ( write(fd, &dh, SFSTDHSZ) != SFSTDHSZ )
1098                 tlog(TL_CRIT|TL_EXIT, "write failed: %s", strerror(errno));
1099
1100         if ( extrasize ) {
1101                 if ( write(fd, extradata, extrasize) != extrasize )
1102                         tlog(TL_CRIT|TL_EXIT, "write failed: %s", strerror(errno));
1103                 if ( extrasize != MAXALIGN(extrasize) ) {
1104                         char dummy[8] = {0,0,0,0,0,0,0,0};
1105                         if ( write(fd, dummy, MAXALIGN(extrasize) - extrasize ) != MAXALIGN(extrasize) - extrasize )
1106                                 tlog(TL_CRIT|TL_EXIT, "write failed: %s", strerror(errno));
1107
1108                         extrasize = MAXALIGN(extrasize);
1109                 }
1110         }
1111
1112         if ( info->plainmemory ) {
1113                 if ( write(fd, info->node, info->totalen) != info->totalen )
1114                         tlog(TL_CRIT|TL_EXIT, "write failed: %s", strerror(errno));
1115         } else {
1116                 WorkPlain       wp;
1117
1118                 wp.info = info;
1119                 wp.offset = 0;
1120
1121                 writeNode(&wp, fd, info->node, extrasize);
1122         }
1123
1124         flock(fd, LOCK_UN);
1125         close(fd);
1126 }
1127
1128 static SFSNode*
1129 readNode(SFSTree *info, int fd, char *buf, int bufsize, int extrasize) {
1130         SFSNode *node;
1131         int             size;
1132
1133         size = read(fd, buf, bufsize );
1134         if ( size < SFSNHRDSZ + sizeof(void*) )
1135                 tlog(TL_CRIT|TL_EXIT, "read failed: %s", strerror(errno));
1136
1137         size = getNodeSize(info, (SFSNode*)buf);
1138         tassert( size <= bufsize );
1139         node = (SFSNode*)tmalloc( size );
1140         memcpy(node, buf, size);
1141
1142         if ( node->isskip ) {
1143                 if (node->haschild) {
1144                         if ( lseek(fd, *(Opaque*)node->data + SFSTDHSZ + extrasize, SEEK_SET) < 0 )
1145                                 tlog(TL_CRIT|TL_EXIT, "lseek failed: %s", strerror(errno));
1146                         *(SFSNode**)( (char*)(node->data) ) =
1147                                 readNode(info, fd, buf, bufsize, extrasize);
1148                 }
1149         } else {
1150                 SFSNodeData *nd = node->data;
1151                 u_int32_t   i;
1152
1153                 for(i=0;i<node->nchar;i++) {
1154                         if (nd->haschild) {
1155                                 if ( lseek(fd, *(Opaque*)(((char*)nd) + nd->child ) + SFSTDHSZ + extrasize, SEEK_SET) < 0 )
1156                                         tlog(TL_CRIT|TL_EXIT, "lseek failed: %s", strerror(errno));
1157                                 *(SFSNode**) (((char*)nd) + nd->child ) =
1158                                         readNode(info, fd, buf, bufsize, extrasize);
1159                         }
1160                         nd++;
1161                 }
1162         }
1163
1164         return node;
1165 }
1166
1167 void
1168 SFSReadDump(SFSTree *info, char *filename, void **extradata, u_int32_t *extrasize) {
1169         int                 fd;
1170         SFSTreeDumpHeader   dh;
1171         char                            *buf;
1172         int                                     bufsize;
1173
1174         if ( extradata )
1175                 *extradata = NULL;
1176         if (extrasize )
1177                 *extrasize = 0;
1178
1179         memset(info,0,sizeof(SFSTree));
1180
1181         if ( (fd = open(filename, O_RDONLY)) < 0 )
1182                 tlog(TL_CRIT|TL_EXIT, "Can not open file '%s': %s", strerror(errno));
1183         if ( flock(fd, LOCK_SH) < 0 )
1184                 tlog(TL_CRIT|TL_EXIT, "flock failed: %s", strerror(errno));
1185
1186         if ( read(fd, &dh, SFSTDHSZ) != SFSTDHSZ )
1187                 tlog(TL_CRIT|TL_EXIT, "read failed: %s", strerror(errno));
1188
1189         if ( dh.version != SFSTREE_VERSION )
1190                 tlog(TL_CRIT|TL_EXIT, "Tree version mismatch (should be 0x%04x but 0x%04x)", SFSTREE_VERSION, dh.version);
1191         if ( dh.opaquesize != sizeof(Opaque) )
1192                 tlog(TL_CRIT|TL_EXIT, "sizeof(Opaque) mismatch");
1193         if ( dh.headersize != SFSTDHSZ )
1194                 tlog(TL_CRIT|TL_EXIT, "Tree's header size mismatch (should be %d but %d bytes)", SFSTDHSZ, dh.headersize);
1195
1196         info->totalen = dh.totalen;
1197         info->nnodes = dh.nnodes;
1198         info->datasize = dh.datasize;
1199
1200         if ( dh.extrasize ) {
1201                 void    *pointer = tmalloc( MAXALIGN(dh.extrasize) );
1202
1203                 if ( read(fd, pointer, MAXALIGN(dh.extrasize)) != MAXALIGN(dh.extrasize) )
1204                         tlog(TL_CRIT|TL_EXIT, "read failed: %s", strerror(errno));
1205
1206                 if ( extradata )
1207                         *extradata = pointer;
1208                 else
1209                         tfree(pointer);
1210
1211                 if ( extrasize )
1212                         *extrasize = dh.extrasize;
1213         }
1214
1215         /* allocate buffer with max allowed size */
1216         bufsize = SFSNHRDSZ + 256*(sizeof(SFSNodeData) + sizeof(void*) + info->datasize);
1217         buf = tmalloc( bufsize );
1218         info->node = readNode(info, fd, buf, bufsize, MAXALIGN(dh.extrasize));
1219         tfree(buf);
1220
1221         flock(fd, LOCK_UN);
1222         close(fd);
1223 }
1224
1225 void
1226 SFSInitFromDump(SFSTree *info, void *pointer, u_int64_t size, void **extradata, u_int32_t *extrasize) {
1227         SFSTreeDumpHeader       *dh;
1228
1229         if ( extradata )
1230                 *extradata = NULL;
1231         if (extrasize )
1232                 *extrasize = 0;
1233
1234         memset(info,0,sizeof(SFSTree));
1235
1236         if ( size && size < SFSTDHSZ )
1237                 tlog(TL_CRIT|TL_EXIT, "Memsize too small");
1238
1239         dh = (SFSTreeDumpHeader*)pointer;
1240
1241         if ( dh->version != SFSTREE_VERSION )
1242                 tlog(TL_CRIT|TL_EXIT, "Tree version mismatch (should be 0x%04x but 0x%04x)", SFSTREE_VERSION, dh->version);
1243         if ( dh->opaquesize != sizeof(Opaque) )
1244                 tlog(TL_CRIT|TL_EXIT, "sizeof(Opaque) mismatch");
1245         if ( dh->headersize != SFSTDHSZ )
1246                 tlog(TL_CRIT|TL_EXIT, "Tree's header size mismatch (should be %d but %d bytes)", SFSTDHSZ, dh->headersize);
1247         if ( size && size != dh->totalen + SFSTDHSZ  + MAXALIGN(dh->extrasize) )
1248                 tlog(TL_CRIT|TL_EXIT, "Memory size mismatch (should be %d but %d bytes)", dh->totalen + SFSTDHSZ + dh->extrasize , size);
1249
1250         info->totalen = dh->totalen;
1251         info->nnodes = dh->nnodes;
1252         info->datasize = dh->datasize;
1253         info->plainmemory = 1;
1254
1255         if ( dh->extrasize ) {
1256                 if ( extradata )
1257                         *extradata = ((char*)pointer) + SFSTDHSZ;
1258
1259                 if ( extrasize )
1260                         *extrasize = dh->extrasize;
1261         }
1262
1263         if ( info->totalen && info->nnodes )
1264                 info->node = (SFSNode*)( ((char*)pointer) + SFSTDHSZ + MAXALIGN(dh->extrasize) );
1265 }