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_shashBucket

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, size_t 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.

Detailed Description

Hash table implemenation.

Definition in file rpmhash.c.


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.


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.

Referenced by htFree().

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.

Referenced by htGetEntry(), and htHasEntry().

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 151 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 77 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 177 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,
size_t  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 159 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 207 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 data value from bucket
*dataCount data value size from bucket
*tableKey key value from bucket (may be NULL)
Returns:
0 on success, 1 if the item is not found.

Definition at line 242 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 235 of file rpmhash.c.

References findEntry().

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