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rpmdb/rpmhash.h File Reference

Hash table implemenation. More...

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Typedefs

typedef hashTable_shashTable
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.


Detailed Description

Hash table implemenation.

Definition in file rpmhash.h.


Typedef Documentation

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

Definition at line 24 of file rpmhash.h.

Referenced by htCreate().

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

Definition at line 19 of file rpmhash.h.

Referenced by htCreate().

typedef struct hashTable_s* hashTable
 

Definition at line 11 of file rpmhash.h.


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.

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.

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 hashTable_s::buckets, hashTable_s::eq, hashTable_s::fn, hashTable_s::freeData, hashEqualityType, hashFunctionType, 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 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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