rpmdb/rpmhash.h File Reference

Hash table implemenation. More...

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

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Detailed Description

Hash table implemenation.

Definition in file rpmhash.h.

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Typedef Documentation

typedef int(*) hashEqualityType(const void *key1, const void *key2)

Definition at line 24 of file rpmhash.h.

typedef unsigned int(*) hashFunctionType(const void *string)

Definition at line 19 of file rpmhash.h.

typedef struct hashTable_s* hashTable

Definition at line 11 of file rpmhash.h.

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Function Documentation

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 61 of file rpmhash.c.

Referenced by fpCacheCreate().

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 68 of file rpmhash.c.

Referenced by fpCacheCreate().

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 106 of file rpmhash.c.

References hashTable_s::buckets, hashBucket_s::data, hashBucket_s::dataCount, hashTable_s::eq, hashTable_s::fn, hashBucket_s::key, hashTable_s::keySize, hashBucket_s::next, hashTable_s::numBuckets, xmalloc(), and xrealloc().

Referenced by doLookup(), and rpmtsRun().

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 87 of file rpmhash.c.

References xcalloc(), and xmalloc().

Referenced by fpCacheCreate(), and rpmtsRun().

hashTable htFree

(

hashTable

ht

)

Destroy hash table.

Parameters:

ht

pointer to hash table

Returns:

NULL always

Definition at line 139 of file rpmhash.c.

References _free(), hashTable_s::buckets, hashBucket_s::data, hashTable_s::freeData, hashBucket_s::key, hashTable_s::keySize, hashBucket_s::next, and hashTable_s::numBuckets.

Referenced by fpCacheFree(), and rpmtsRun().

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 182 of file rpmhash.c.

References hashBucket_s::data, hashBucket_s::dataCount, findEntry(), and hashBucket_s::key.

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 175 of file rpmhash.c.

References findEntry().

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