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authorMike Buland <eichlan@xagasoft.com>2007-04-03 04:50:36 +0000
committerMike Buland <eichlan@xagasoft.com>2007-04-03 04:50:36 +0000
commitda89e6d30e57bd6dbb10b4d36b093ce9bbf5c666 (patch)
tree0c8d31d13521011dc52a3fbadbf9e7e27929308f /src/old/hash.h
parentf4c20290509d7ed3a8fd5304577e7a4cc0b9d974 (diff)
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The first batch seem to have made it alright. Unfortunately the Archive class
isn't done yet, I'm going to make it rely on streams, so those will be next, then we can make it work all sortsa' well.
Diffstat (limited to '')
-rw-r--r--src/old/hash.h744
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diff --git a/src/old/hash.h b/src/old/hash.h
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index e819379..0000000
--- a/src/old/hash.h
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@@ -1,744 +0,0 @@
1#ifndef HASH_H
2#define HASH_H
3
4#include <stddef.h>
5#include <string.h>
6#include <memory>
7#include <iostream>
8#include <list>
9#include "exceptionbase.h"
10#include "hashable.h"
11#include "serializable.h"
12#include "serializer.h"
13
14#define bitsToBytes( n ) (n/32+(n%32>0 ? 1 : 0))
15
16subExceptionDecl( HashException )
17
18enum eHashException
19{
20 excodeNotFilled
21};
22
23template<typename T>
24uint32_t __calcHashCode( const T &k );
25
26template<typename T>
27bool __cmpHashKeys( const T &a, const T &b );
28
29struct __calcNextTSize_fast
30{
31 uint32_t operator()( uint32_t nCapacity, uint32_t nFill, uint32_t nDeleted ) const
32 {
33 if( nDeleted >= nCapacity/2 )
34 return nCapacity;
35 return nCapacity*2+1;
36 }
37};
38
39template<typename key, typename value, typename sizecalc = __calcNextTSize_fast, typename keyalloc = std::allocator<key>, typename valuealloc = std::allocator<value>, typename challoc = std::allocator<uint32_t> >
40class Hash;
41
42template< typename key, typename _value, typename sizecalc = __calcNextTSize_fast, typename keyalloc = std::allocator<key>, typename valuealloc = std::allocator<_value>, typename challoc = std::allocator<uint32_t> >
43struct HashProxy
44{
45 friend class Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc>;
46private:
47 HashProxy( Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc> &h, key *k, uint32_t nPos, uint32_t hash ) :
48 hsh( h ),
49 pKey( k ),
50 nPos( nPos ),
51 hash( hash ),
52 bFilled( false )
53 {
54 }
55
56 HashProxy( Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc> &h, uint32_t nPos, _value *pValue ) :
57 hsh( h ),
58 nPos( nPos ),
59 pValue( pValue ),
60 bFilled( true )
61 {
62 }
63
64 Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc> &hsh;
65 key *pKey;
66 uint32_t nPos;
67 _value *pValue;
68 uint32_t hash;
69 bool bFilled;
70
71public:
72 operator _value &()
73 {
74 if( bFilled == false )
75 throw HashException(
76 excodeNotFilled,
77 "No data assosiated with that key."
78 );
79 return *pValue;
80 }
81
82 _value &value()
83 {
84 if( bFilled == false )
85 throw HashException(
86 excodeNotFilled,
87 "No data assosiated with that key."
88 );
89 return *pValue;
90 }
91
92 bool isFilled()
93 {
94 return bFilled;
95 }
96
97 void erase()
98 {
99 if( bFilled )
100 {
101 hsh._erase( nPos );
102 hsh.onDelete();
103 }
104 }
105
106 _value operator=( _value nval )
107 {
108 if( bFilled )
109 {
110 hsh.va.destroy( pValue );
111 hsh.va.construct( pValue, nval );
112 hsh.onUpdate();
113 }
114 else
115 {
116 hsh.fill( nPos, *pKey, nval, hash );
117 hsh.onInsert();
118 }
119
120 return nval;
121 }
122
123 _value *operator->()
124 {
125 if( bFilled == false )
126 throw HashException(
127 excodeNotFilled,
128 "No data assosiated with that key."
129 );
130 return pValue;
131 }
132};
133
134template<typename key, typename value, typename sizecalc, typename keyalloc, typename valuealloc, typename challoc >
135class Hash
136{
137 friend struct HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc>;
138public:
139 Hash() :
140 nCapacity( 11 ),
141 nFilled( 0 ),
142 nDeleted( 0 ),
143 bFilled( NULL ),
144 bDeleted( NULL ),
145 aKeys( NULL ),
146 aValues( NULL ),
147 aHashCodes( NULL )
148 {
149 nKeysSize = bitsToBytes( nCapacity );
150 bFilled = ca.allocate( nKeysSize );
151 bDeleted = ca.allocate( nKeysSize );
152 clearBits();
153
154 aHashCodes = ca.allocate( nCapacity );
155 aKeys = ka.allocate( nCapacity );
156 aValues = va.allocate( nCapacity );
157 }
158
159 Hash( const Hash &src ) :
160 nCapacity( src.nCapacity ),
161 nFilled( 0 ),
162 nDeleted( 0 ),
163 bFilled( NULL ),
164 bDeleted( NULL ),
165 aKeys( NULL ),
166 aValues( NULL ),
167 aHashCodes( NULL )
168 {
169 nKeysSize = bitsToBytes( nCapacity );
170 bFilled = ca.allocate( nKeysSize );
171 bDeleted = ca.allocate( nKeysSize );
172 clearBits();
173
174 aHashCodes = ca.allocate( nCapacity );
175 aKeys = ka.allocate( nCapacity );
176 aValues = va.allocate( nCapacity );
177
178 for( uint32_t j = 0; j < src.nCapacity; j++ )
179 {
180 if( src.isFilled( j ) )
181 {
182 insert( src.aKeys[j], src.aValues[j] );
183 }
184 }
185 }
186
187 Hash &operator=( const Hash &src )
188 {
189 for( uint32_t j = 0; j < nCapacity; j++ )
190 {
191 if( isFilled( j ) )
192 if( !isDeleted( j ) )
193 {
194 va.destroy( &aValues[j] );
195 ka.destroy( &aKeys[j] );
196 }
197 }
198 va.deallocate( aValues, nCapacity );
199 ka.deallocate( aKeys, nCapacity );
200 ca.deallocate( bFilled, nKeysSize );
201 ca.deallocate( bDeleted, nKeysSize );
202 ca.deallocate( aHashCodes, nCapacity );
203
204 nFilled = 0;
205 nDeleted = 0;
206 nCapacity = src.nCapacity;
207 nKeysSize = bitsToBytes( nCapacity );
208 bFilled = ca.allocate( nKeysSize );
209 bDeleted = ca.allocate( nKeysSize );
210 clearBits();
211
212 aHashCodes = ca.allocate( nCapacity );
213 aKeys = ka.allocate( nCapacity );
214 aValues = va.allocate( nCapacity );
215
216 for( uint32_t j = 0; j < src.nCapacity; j++ )
217 {
218 if( src.isFilled( j ) )
219 {
220 insert( src.aKeys[j], src.aValues[j] );
221 }
222 }
223
224 return *this;
225 }
226
227 virtual ~Hash()
228 {
229 for( uint32_t j = 0; j < nCapacity; j++ )
230 {
231 if( isFilled( j ) )
232 if( !isDeleted( j ) )
233 {
234 va.destroy( &aValues[j] );
235 ka.destroy( &aKeys[j] );
236 }
237 }
238 va.deallocate( aValues, nCapacity );
239 ka.deallocate( aKeys, nCapacity );
240 ca.deallocate( bFilled, nKeysSize );
241 ca.deallocate( bDeleted, nKeysSize );
242 ca.deallocate( aHashCodes, nCapacity );
243 }
244
245 uint32_t getCapacity()
246 {
247 return nCapacity;
248 }
249
250 uint32_t getFill()
251 {
252 return nFilled;
253 }
254
255 uint32_t size()
256 {
257 return nFilled-nDeleted;
258 }
259
260 uint32_t getDeleted()
261 {
262 return nDeleted;
263 }
264
265 virtual HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc> operator[]( key k )
266 {
267 uint32_t hash = __calcHashCode( k );
268 bool bFill;
269 uint32_t nPos = probe( hash, k, bFill );
270
271 if( bFill )
272 {
273 return HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc>( *this, nPos, &aValues[nPos] );
274 }
275 else
276 {
277 return HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc>( *this, &k, nPos, hash );
278 }
279 }
280
281 virtual void insert( key k, value v )
282 {
283 uint32_t hash = __calcHashCode( k );
284 bool bFill;
285 uint32_t nPos = probe( hash, k, bFill );
286
287 if( bFill )
288 {
289 va.destroy( &aValues[nPos] );
290 va.construct( &aValues[nPos], v );
291 onUpdate();
292 }
293 else
294 {
295 fill( nPos, k, v, hash );
296 onInsert();
297 }
298 }
299
300 virtual void erase( key k )
301 {
302 uint32_t hash = __calcHashCode( k );
303 bool bFill;
304 uint32_t nPos = probe( hash, k, bFill );
305
306 if( bFill )
307 {
308 _erase( nPos );
309 onDelete();
310 }
311 }
312
313 struct iterator;
314 virtual void erase( struct iterator &i )
315 {
316 if( this != &i.hsh )
317 throw HashException("This iterator didn't come from this Hash.");
318 if( isFilled( i.nPos ) && !isDeleted( i.nPos ) )
319 {
320 _erase( i.nPos );
321 onDelete();
322 }
323 }
324
325 virtual void clear()
326 {
327 for( uint32_t j = 0; j < nCapacity; j++ )
328 {
329 if( isFilled( j ) )
330 if( !isDeleted( j ) )
331 {
332 va.destroy( &aValues[j] );
333 ka.destroy( &aKeys[j] );
334 onDelete();
335 }
336 }
337
338 clearBits();
339 }
340
341 virtual value &get( key k )
342 {
343 uint32_t hash = __calcHashCode( k );
344 bool bFill;
345 uint32_t nPos = probe( hash, k, bFill );
346
347 if( bFill )
348 {
349 return aValues[nPos];
350 }
351 else
352 {
353 throw HashException(
354 excodeNotFilled,
355 "No data assosiated with that key."
356 );
357 }
358 }
359
360 virtual bool has( key k )
361 {
362 bool bFill;
363 probe( __calcHashCode( k ), k, bFill, false );
364
365 return bFill;
366 }
367
368 typedef struct iterator
369 {
370 friend class Hash<key, value, sizecalc, keyalloc, valuealloc, challoc>;
371 private:
372 iterator( Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh ) :
373 hsh( hsh ),
374 nPos( 0 ),
375 bFinished( false )
376 {
377 nPos = hsh.getFirstPos( bFinished );
378 }
379
380 iterator( Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh, bool bDone ) :
381 hsh( hsh ),
382 nPos( 0 ),
383 bFinished( bDone )
384 {
385 }
386
387 Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh;
388 uint32_t nPos;
389 bool bFinished;
390
391 public:
392 iterator operator++( int )
393 {
394 if( bFinished == false )
395 nPos = hsh.getNextPos( nPos, bFinished );
396
397 return *this;
398 }
399
400 iterator operator++()
401 {
402 if( bFinished == false )
403 nPos = hsh.getNextPos( nPos, bFinished );
404
405 return *this;
406 }
407
408 bool operator==( const iterator &oth )
409 {
410 if( bFinished != oth.bFinished )
411 return false;
412 if( bFinished == true )
413 {
414 return true;
415 }
416 else
417 {
418 if( oth.nPos == nPos )
419 return true;
420 return false;
421 }
422 }
423
424 bool operator!=( const iterator &oth )
425 {
426 return !(*this == oth );
427 }
428
429 iterator operator=( const iterator &oth )
430 {
431 if( &hsh != &oth.hsh )
432 throw HashException(
433 "Cannot mix iterators from different hash objects.");
434 nPos = oth.nPos;
435 bFinished = oth.bFinished;
436 }
437
438 std::pair<key,value> operator *()
439 {
440 return hsh.getAtPos( nPos );
441 }
442
443 key &getKey()
444 {
445 return hsh.getKeyAtPos( nPos );
446 }
447
448 value &getValue()
449 {
450 return hsh.getValueAtPos( nPos );
451 }
452 };
453
454 iterator begin()
455 {
456 return iterator( *this );
457 }
458
459 iterator end()
460 {
461 return iterator( *this, true );
462 }
463
464 std::list<key> getKeys()
465 {
466 std::list<key> lKeys;
467
468 for( uint32_t j = 0; j < nCapacity; j++ )
469 {
470 if( isFilled( j ) )
471 {
472 if( !isDeleted( j ) )
473 {
474 lKeys.push_back( aKeys[j] );
475 }
476 }
477 }
478
479 return lKeys;
480 }
481
482protected:
483 virtual void onInsert() {}
484 virtual void onUpdate() {}
485 virtual void onDelete() {}
486 virtual void onReHash() {}
487
488 virtual void clearBits()
489 {
490 for( uint32_t j = 0; j < nKeysSize; j++ )
491 {
492 bFilled[j] = bDeleted[j] = 0;
493 }
494 }
495
496 virtual void fill( uint32_t loc, key &k, value &v, uint32_t hash )
497 {
498 bFilled[loc/32] |= (1<<(loc%32));
499 va.construct( &aValues[loc], v );
500 ka.construct( &aKeys[loc], k );
501 aHashCodes[loc] = hash;
502 nFilled++;
503 //printf("Filled: %d, Deleted: %d, Capacity: %d\n",
504 // nFilled, nDeleted, nCapacity );
505 }
506
507 virtual void _erase( uint32_t loc )
508 {
509 bDeleted[loc/32] |= (1<<(loc%32));
510 va.destroy( &aValues[loc] );
511 ka.destroy( &aKeys[loc] );
512 nDeleted++;
513 //printf("Filled: %d, Deleted: %d, Capacity: %d\n",
514 // nFilled, nDeleted, nCapacity );
515 }
516
517 virtual std::pair<key,value> getAtPos( uint32_t nPos )
518 {
519 return std::pair<key,value>(aKeys[nPos],aValues[nPos]);
520 }
521
522 virtual key &getKeyAtPos( uint32_t nPos )
523 {
524 return aKeys[nPos];
525 }
526
527 virtual value &getValueAtPos( uint32_t nPos )
528 {
529 return aValues[nPos];
530 }
531
532 virtual uint32_t getFirstPos( bool &bFinished )
533 {
534 for( uint32_t j = 0; j < nCapacity; j++ )
535 {
536 if( isFilled( j ) )
537 if( !isDeleted( j ) )
538 return j;
539 }
540
541 bFinished = true;
542 return 0;
543 }
544
545 virtual uint32_t getNextPos( uint32_t nPos, bool &bFinished )
546 {
547 for( uint32_t j = nPos+1; j < nCapacity; j++ )
548 {
549 if( isFilled( j ) )
550 if( !isDeleted( j ) )
551 return j;
552 }
553
554 bFinished = true;
555 return 0;
556 }
557
558 uint32_t probe( uint32_t hash, key k, bool &bFill, bool rehash=true )
559 {
560 uint32_t nCur = hash%nCapacity;
561
562 // First we scan to see if the key is already there, abort if we
563 // run out of probing room, or we find a non-filled entry
564 for( int8_t j = 0;
565 isFilled( nCur ) && j < 32;
566 nCur = (nCur + (1<<j))%nCapacity, j++
567 )
568 {
569 // Is this the same hash code we were looking for?
570 if( hash == aHashCodes[nCur] )
571 {
572 // Skip over deleted entries. Deleted entries are also filled,
573 // so we only have to do this check here.
574 if( isDeleted( nCur ) )
575 continue;
576
577 // Is it really the same key? (for safety)
578 if( __cmpHashKeys( aKeys[nCur], k ) == true )
579 {
580 bFill = true;
581 return nCur;
582 }
583 }
584 }
585
586 // This is our insurance, if the table is full, then go ahead and
587 // rehash, then try again.
588 if( isFilled( nCur ) && rehash == true )
589 {
590 reHash( szCalc(getCapacity(), getFill(), getDeleted()) );
591
592 // This is potentially dangerous, and could cause an infinite loop.
593 // Be careful writing probe, eh?
594 return probe( hash, k, bFill );
595 }
596
597 bFill = false;
598 return nCur;
599 }
600
601 void reHash( uint32_t nNewSize )
602 {
603 //printf("---REHASH---");
604 //printf("Filled: %d, Deleted: %d, Capacity: %d\n",
605 // nFilled, nDeleted, nCapacity );
606
607 // Save all the old data
608 uint32_t nOldCapacity = nCapacity;
609 uint32_t *bOldFilled = bFilled;
610 uint32_t *aOldHashCodes = aHashCodes;
611 uint32_t nOldKeysSize = nKeysSize;
612 uint32_t *bOldDeleted = bDeleted;
613 value *aOldValues = aValues;
614 key *aOldKeys = aKeys;
615
616 // Calculate new sizes
617 nCapacity = nNewSize;
618 nKeysSize = bitsToBytes( nCapacity );
619
620 // Allocate new memory + prep
621 bFilled = ca.allocate( nKeysSize );
622 bDeleted = ca.allocate( nKeysSize );
623 clearBits();
624
625 aHashCodes = ca.allocate( nCapacity );
626 aKeys = ka.allocate( nCapacity );
627 aValues = va.allocate( nCapacity );
628
629 nDeleted = nFilled = 0;
630
631 // Re-insert all of the old data (except deleted items)
632 for( uint32_t j = 0; j < nOldCapacity; j++ )
633 {
634 if( (bOldFilled[j/32]&(1<<(j%32)))!=0 &&
635 (bOldDeleted[j/32]&(1<<(j%32)))==0 )
636 {
637 insert( aOldKeys[j], aOldValues[j] );
638 }
639 }
640
641 // Delete all of the old data
642 for( uint32_t j = 0; j < nOldCapacity; j++ )
643 {
644 if( (bOldFilled[j/32]&(1<<(j%32)))!=0 )
645 {
646 va.destroy( &aOldValues[j] );
647 ka.destroy( &aOldKeys[j] );
648 }
649 }
650 va.deallocate( aOldValues, nOldCapacity );
651 ka.deallocate( aOldKeys, nOldCapacity );
652 ca.deallocate( bOldFilled, nOldKeysSize );
653 ca.deallocate( bOldDeleted, nOldKeysSize );
654 ca.deallocate( aOldHashCodes, nOldCapacity );
655 }
656
657 virtual bool isFilled( uint32_t loc ) const
658 {
659 return (bFilled[loc/32]&(1<<(loc%32)))!=0;
660 }
661
662 virtual bool isDeleted( uint32_t loc )
663 {
664 return (bDeleted[loc/32]&(1<<(loc%32)))!=0;
665 }
666
667protected:
668 uint32_t nCapacity;
669 uint32_t nFilled;
670 uint32_t nDeleted;
671 uint32_t *bFilled;
672 uint32_t *bDeleted;
673 uint32_t nKeysSize;
674 key *aKeys;
675 value *aValues;
676 uint32_t *aHashCodes;
677 valuealloc va;
678 keyalloc ka;
679 challoc ca;
680 sizecalc szCalc;
681};
682
683template<> uint32_t __calcHashCode<int>( const int &k );
684template<> bool __cmpHashKeys<int>( const int &a, const int &b );
685
686template<> uint32_t __calcHashCode<unsigned int>( const unsigned int &k );
687template<> bool __cmpHashKeys<unsigned int>( const unsigned int &a, const unsigned int &b );
688
689template<> uint32_t __calcHashCode<const char *>( const char * const &k );
690template<> bool __cmpHashKeys<const char *>( const char * const &a, const char * const &b );
691
692template<> uint32_t __calcHashCode<char *>( char * const &k );
693template<> bool __cmpHashKeys<char *>( char * const &a, char * const &b );
694
695template<> uint32_t __calcHashCode<std::string>( const std::string &k );
696template<> bool __cmpHashKeys<std::string>( const std::string &a, const std::string &b );
697
698template<> uint32_t __calcHashCode<Hashable>( const Hashable &k );
699template<> bool __cmpHashKeys<Hashable>( const Hashable &a, const Hashable &b );
700
701template<typename key, typename value>
702Serializer &operator<<( Serializer &ar, Hash<key,value> &h )
703{
704 ar << h.size();
705 for( typename Hash<key,value>::iterator i = h.begin(); i != h.end(); i++ )
706 {
707 std::pair<key,value> p = *i;
708 ar << p.first << p.second;
709 }
710
711 return ar;
712}
713
714template<typename key, typename value>
715Serializer &operator>>( Serializer &ar, Hash<key,value> &h )
716{
717 h.clear();
718 uint32_t nSize;
719 ar >> nSize;
720
721 for( uint32_t j = 0; j < nSize; j++ )
722 {
723 key k; value v;
724 ar >> k >> v;
725 h.insert( k, v );
726 }
727
728 return ar;
729}
730
731template<typename key, typename value>
732Serializer &operator&&( Serializer &ar, Hash<key,value> &h )
733{
734 if( ar.isLoading() )
735 {
736 return ar >> h;
737 }
738 else
739 {
740 return ar << h;
741 }
742}
743
744#endif
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