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lib/hash.c File Reference

Hash table implemenation. More...

#include "system.h"
#include <rpmlib.h>
#include "hash.h"
#include "debug.h"

Go to the source code of this file.

Compounds
struct	hashBucket
struct	hashTable_s
Typedefs
typedef const void*	voidptr
Functions
struct hashBucket*	findEntry (hashTable ht, const void * key)
	Find entry in hash table. More...
int	hashEqualityString (const void * key1, const void * key2)
	Compare two hash table entries for equality. More...
unsigned int	hashFunctionString (const void * string)
	Return hash value of a string. More...
hashTable	htCreate (int numBuckets, int keySize, int freeData, hashFunctionType fn, hashEqualityType eq)
	Create hash table. More...
void	htAddEntry (hashTable ht, const void * key, const void * data)
	Add item to hash table. More...
void	htFree (hashTable ht)
	Destroy hash table. More...
int	htHasEntry (hashTable ht, const void * key)
	Check for key in hash table. More...
int	htGetEntry (hashTable ht, const void * key, const void *** data, int * dataCount, const void ** tableKey)
	Retrieve item from hash table. More...

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Detailed Description

Hash table implemenation.

Definition in file hash.c.

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Typedef Documentation

typedef const void* voidptr

Definition at line 11 of file hash.c.

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Function Documentation

struct hashBucket * findEntry ( hashTable ht, const void * key ) [static]

Find entry in hash table. Parameters: ht   pointer to hash table key   pointer to key value Returns: pointer to hash bucket of key (or NULL) Definition at line 37 of file hash.c.

int hashEqualityString ( const void * key1, const void * key2 )

Compare two hash table entries for equality. Parameters: key1   entry 1 key2   entry 2 Returns: 0 if entries are equal Definition at line 51 of file hash.c.

unsigned int hashFunctionString ( const void * string )

Return hash value of a string. Parameters: string   string on which to calculate hash value Returns: hash value Definition at line 58 of file hash.c.

void htAddEntry ( hashTable ht, const void * key, const void * data )

Add item to hash table. Parameters: ht   pointer to hash table key   pointer to key data   pointer to data value Definition at line 91 of file hash.c. Referenced by doLookup(), and rpmRunTransactions().

hashTable htCreate ( int numBuckets, int keySize, int freeData, hashFunctionType fn, hashEqualityType eq )

Create hash table. If keySize > 0, the key is duplicated within the table (which costs memory, but may be useful anyway. Parameters: numBuckets   number of hash buckets keySize   size of key (0 if unknown) freeData   should data be freed when table is destroyed? fn   function to generate hash value for key eq   function to compare hash keys for equality Returns: pointer to initialized hash table Definition at line 75 of file hash.c. Referenced by fpCacheCreate(), and rpmRunTransactions().

void htFree ( hashTable ht )

Destroy hash table. Parameters: ht   pointer to hash table Definition at line 121 of file hash.c. Referenced by fpCacheFree(), and rpmRunTransactions().

int htGetEntry ( hashTable ht, const void * key, const void *** data, int * dataCount, const void ** tableKey )

Retrieve item from hash table. Parameters: ht   pointer to hash table key   pointer to key value Return values: data   address to store data value from bucket dataCount   address to store data value size from bucket tableKey   address to store key value from bucket (may be NULL) Returns: 0 on success, 1 if the item is not found. Definition at line 151 of file hash.c. Referenced by cacheContainsDirectory(), and handleOverlappedFiles().

int htHasEntry ( hashTable ht, const void * key )

Check for key in hash table. Parameters: ht   pointer to hash table key   pointer to key value Returns: 1 if the key is present, 0 otherwise Definition at line 144 of file hash.c.

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