106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
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#ifndef H_RPMHASH
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#define H_RPMHASH
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/**
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* \file rpmdb/rpmhash.h
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* Hash table implemenation.
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*/
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/**
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*/
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typedef /*@abstract@*/ struct hashTable_s * hashTable;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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*/
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typedef unsigned int (*hashFunctionType) (const void * string)
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/*@*/;
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/**
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*/
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typedef int (*hashEqualityType) (const void * key1, const void * key2)
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/*@*/;
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/**
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* Return hash value of a string
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* @param string string on which to calculate hash value
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* @return hash value
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*/
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unsigned int hashFunctionString(const void * string)
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/*@*/;
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/**
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* Compare two hash table entries for equality.
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* @param key1 entry 1
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* @param key2 entry 2
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* @return 0 if entries are equal
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*/
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int hashEqualityString(const void * key1, const void * key2)
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/*@*/;
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/**
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* Create hash table.
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* If keySize > 0, the key is duplicated within the table (which costs
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* memory, but may be useful anyway.
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* @param numBuckets number of hash buckets
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* @param keySize size of key (0 if unknown)
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* @param freeData Should data be freed when table is destroyed?
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* @param fn function to generate hash value for key
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* @param eq function to compare hash keys for equality
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* @return pointer to initialized hash table
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*/
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hashTable htCreate(int numBuckets, int keySize, int freeData,
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hashFunctionType fn, hashEqualityType eq)
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/*@*/;
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/**
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* Destroy hash table.
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* @param ht pointer to hash table
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*/
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void htFree( /*@only@*/ hashTable ht)
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/*@modifies ht @*/;
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/**
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* Add item to hash table.
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* @param ht pointer to hash table
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* @param key pointer to key
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* @param data pointer to data value
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*/
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void htAddEntry(hashTable ht, /*@owned@*/ const void * key,
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/*@owned@*/ const void * data)
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/*@modifies ht */;
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/**
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* Retrieve item from hash table.
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* @param ht pointer to hash table
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* @param key pointer to key value
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* @retval data address to store data value from bucket
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* @retval dataCount address to store data value size from bucket
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* @retval tableKey address to store key value from bucket (may be NULL)
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* @return 0 on success, 1 if the item is not found.
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*/
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int htGetEntry(hashTable ht, const void * key,
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/*@null@*/ /*@out@*/ const void *** data,
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/*@null@*/ /*@out@*/ int * dataCount,
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/*@null@*/ /*@out@*/ const void ** tableKey)
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/*@modifies *data, *dataCount, *tableKey @*/;
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/**
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* Check for key in hash table.
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* @param ht pointer to hash table
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* @param key pointer to key value
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* @return 1 if the key is present, 0 otherwise
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*/
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/*@unused@*/
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int htHasEntry(hashTable ht, const void * key)
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/*@*/;
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#ifdef __cplusplus
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}
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#endif
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#endif
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