rpmio/rpmhash.c File Reference

Hash table implemenation. More...

#include "system.h"
#include <rpmhash.h>
#include "debug.h"

Include dependency graph for rpmhash.c:

Go to the source code of this file.

Data Structures
struct	hashBucket_s
struct	hashTable_s
Typedefs
typedef const void *	voidptr
typedef struct hashBucket_s *	hashBucket
Functions
static void *	_free (const void *p)
	Wrapper to free(3), hides const compilation noise, permit NULL, return NULL.
static hashBucket	findEntry (hashTable ht, const void *key)
	Find entry in hash table.
static uint32_t	hashFunctionString (uint32_t h, const void *data, size_t size)
	Return hash value of a string.
static 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.
void	htAddEntry (hashTable ht, const void *key, const void *data)
	Add item to hash table.
hashTable	htFree (hashTable ht)
	Destroy hash table.
int	htHasEntry (hashTable ht, const void *key)
	Check for key in hash table.
int	htGetEntry (hashTable ht, const void *key, const void ***data, int *dataCount, const void **tableKey)
	Retrieve item from hash table.

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Detailed Description

Hash table implemenation.

Definition in file rpmhash.c.

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Typedef Documentation

typedef struct hashBucket_s* hashBucket

Definition at line 12 of file rpmhash.c.

typedef const void* voidptr

Definition at line 10 of file rpmhash.c.

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Function Documentation

static void* _free

(

const void *

p

)

[inline, static]

Wrapper to free(3), hides const compilation noise, permit NULL, return NULL.

Parameters:

p

memory to free

Return values:

NULL

always

Definition at line 40 of file rpmhash.c.

static 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 53 of file rpmhash.c.

References hashTable_s::buckets, hashTable_s::eq, hashTable_s::fn, hashBucket_s::key, hashBucket_s::next, and hashTable_s::numBuckets.

static int hashEqualityString	(	const void *	key1,
		const void *	key2
	)			[static]

Compare two hash table entries for equality.

Parameters:

	key1	entry 1
	key2	entry 2

Returns:

0 if entries are equal

Definition at line 107 of file rpmhash.c.

Referenced by htCreate().

static uint32_t hashFunctionString	(	uint32_t	h,
		const void *	data,
		size_t	size
	)			[static]

Return hash value of a string.

Parameters:

	h	hash initial value
	data	data on which to calculate hash value
	size	size of data in bytes

Returns:

hash value

Definition at line 79 of file rpmhash.c.

Referenced by htCreate().

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 134 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 key (NULL for default)
	eq	function to compare keys for equality (NULL for default)

Returns:

pointer to initialized hash table

Definition at line 115 of file rpmhash.c.

References hashTable_s::buckets, hashTable_s::eq, hashTable_s::fn, hashTable_s::freeData, hashEqualityString(), hashFunctionString(), hashTable_s::keySize, hashTable_s::numBuckets, 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 167 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 210 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 203 of file rpmhash.c.

References findEntry().