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1 /*
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2 * Copyright 2009 OpenSourceResearchInstitute.org
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3 * Licensed under GNU General Public License version 2
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4 *
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5 * Author: seanhalle@yahoo.com
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6 */
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7
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8 #ifndef _PRHASH_H
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9 #define _PRHASH_H
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10
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11 #include <stdio.h>
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12 #include <string.h>
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13 #include <errno.h>
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14 #include <stdlib.h>
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15
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16 #include <PR__include/PR__primitive_data_types.h>
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17
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18 //===================== defines =====================
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19 #define TRUE 1
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20 #define FALSE 0
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21
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22 #define DEFAULT_HASH_TABLE_SIZE 1 << 10
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23 #define DEFAULT_POWER_OF_2_TABLE_SIZE 10
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24
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25
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26 //===================== structs =====================
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27 union hashkey_t{
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28 char hashable[8];
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29 int32 parts[2];
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30 };
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31
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32 typedef union hashkey_t hashkey_t;
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33
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34 typedef struct _HashEntry HashEntry;
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35
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36 struct _HashEntry
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37 {
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38 char *key;
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39 void *content;
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40 HashEntry *next;
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41 };
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42
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43 typedef void (*FreeEntryContentFnPtr) ( void * );
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44
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45 typedef struct
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46 { int32 tableSz;
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47 int32 numEntries;
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48 HashEntry* *entries;
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49 int32 hashMask;
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50 int32 prevHash;
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51 FreeEntryContentFnPtr freeEntryContentFn;
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52 }
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53 HashTable;
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54
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55
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56 //===========================================================================
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57 // Public functions
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58 HashTable *makeHashTable( int numHashSlots, FreeEntryContentFnPtr freeFn );
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59
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60 int32 putEntryIntoTable( HashEntry *entry, HashTable *table);
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61 int32 addValueIntoTable( char* key, void *value, HashTable *table);
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62 HashEntry *getEntryFromTable( char *key, HashTable *table );
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63 void *getValueFromTable( char *key, HashTable *table );
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64
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65 bool8 deleteEntryFromTable( char *key, HashTable *table );
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66 bool8 deleteThisEntryFromTable( HashEntry *entry, HashTable *table );
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67 bool8 deleteEntrysValueInTable( char *key, HashTable *table );
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68 bool8 deleteEntryFromTableAndFreeValue( char *key, HashTable *table );
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69 void freeHashTable( HashTable *table );
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70 //char *paramBagToString( ParamBag * bag )
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71
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72 //================= Same Fns, but for 32b array key hash fn ================
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73 HashTable *makeHashTable32(int32 powerOf2OfSz, FreeEntryContentFnPtr freeFn);
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74 HashTable *makeDefaultSizeHashTable32( FreeEntryContentFnPtr freeFn );
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75
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76 int32 putEntryIntoTable32( HashEntry *entry, HashTable *table);
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77 HashEntry *addValueIntoTable32( uint32 key[], void *value, HashTable *table);
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78 HashEntry *getEntryFromTable32( uint32 key[], HashTable *table );
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79 void *getValueFromTable32( uint32 key[], HashTable *table );
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80
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81 bool32 deleteEntryFromTable32( uint32 key[], HashTable *table );
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82
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83 //===========================================================================
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84 // Internal functions
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85 void freeHashEntryUsing( HashEntry *entry, HashTable *table );
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86 unsigned int hashThisKey( char *s, int hashSz );
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87 void nullOutTablesArray( HashTable *table );
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88 void doubleTableSize( HashTable *table );
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89 void freeHashEntryButNotContent( HashEntry *entry );
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90
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91 uint32
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92 jenkHash32( const uint32 *key, /* array of uint32 values */
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93 int32 length); /* num uint32 in the key */
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94
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95 #endif /* _PRIVATE_HASH_H */
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96
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