mojoshader_common.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 05 Apr 2009 03:20:53 -0400
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Added mojoshader_common.c with first shot at generic hashtable.
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#define __MOJOSHADER_INTERNAL__ 1
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#include "mojoshader_internal.h"
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typedef struct HashItem
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{
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    const void *key;
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    const void *value;
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    struct HashItem *next;
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} HashItem;
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struct HashTable
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{
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    HashItem **table;
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    uint32 table_len;
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    int stackable;
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    HashTable_HashFn hash;
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    HashTable_KeyMatchFn keymatch;
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    HashTable_NukeFn nuke;
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    MOJOSHADER_malloc malloc;
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    MOJOSHADER_free free;
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    void *malloc_data;
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};
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int hash_find(const HashTable *table, const void *key, const void **_value)
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{
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    HashItem *i;
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    const uint32 hash = table->hash(key) & table->table_len;
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    for (i = table->table[hash]; i != NULL; i = i->next)
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    {
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        if (table->keymatch(key, i->key))
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        {
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            if (_value != NULL)
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                *_value = i->value;
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            return 1;
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        } // if
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    } // for
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    return 0;
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} // hash_find
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int hash_insert(HashTable *table, const void *key, const void *value)
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{
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    HashItem *item = NULL;
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    const uint32 hash = table->hash(key) & table->table_len;
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    if ( (!table->stackable) && (hash_find(table, key, NULL)) )
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        return 0;
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    // !!! FIXME: grow and rehash table if it gets too saturated.
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    item = (HashItem *) table->malloc(sizeof (HashItem), table->malloc_data);
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    if (item == NULL)
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        return -1;
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    item->key = key;
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    item->value = value;
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    item->next = table->table[hash];
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    table->table[hash] = item;
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    return 1;
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} // hash_insert
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int hash_init(HashTable *table, const uint32 initial_table_size,
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              const HashTable_HashFn hashfn,
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              const HashTable_KeyMatchFn keymatchfn,
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              const HashTable_NukeFn nukefn,
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              const int stackable,
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              MOJOSHADER_malloc m, MOJOSHADER_free f, void *d)
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{
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    const uint32 alloc_len = sizeof (HashItem *) * initial_table_size;
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    memset(table, '\0', sizeof (HashTable));
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    table->table = (HashItem **) m(alloc_len, d);
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    if (table->table == NULL)
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        return 0;
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    memset(table->table, '\0', alloc_len);
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    table->table_len = initial_table_size;
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    table->stackable = stackable;
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    table->hash = hashfn;
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    table->keymatch = keymatchfn;
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    table->nuke = nukefn;
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    table->malloc = m;
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    table->free = f;
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    table->malloc_data = d;
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    return 1;
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} // hash_init
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void hash_deinit(HashTable *table)
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{
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    uint32 i;
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    for (i = 0; i < table->table_len; i++)
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    {
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        HashItem *item = table->table[i];
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        while (item != NULL)
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        {
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            HashItem *next = item->next;
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            table->nuke(item->key, item->value);
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            table->free(item, table->malloc_data);
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            item = next;
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        } // while
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    } // for
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    table->free(table->table, table->malloc_data);
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    memset(table, '\0', sizeof (HashTable));
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} // hash_deinit
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int hash_remove(HashTable *table, const void *key)
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{
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    HashItem *item = NULL;
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    HashItem *prev = NULL;
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    const uint32 hash = table->hash(key) & table->table_len;
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    for (item = table->table[hash]; item != NULL; item = item->next)
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    {
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        if (table->keymatch(key, item->key))
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        {
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            if (prev != NULL)
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                prev->next = item->next;
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            else
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                table->table[hash] = item->next;
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            table->nuke(item->key, item->value);
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            table->free(item, table->malloc_data);
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            return 1;
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        } // if
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        prev = item;
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    } // for
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    return 0;
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} // hash_remove
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// end of mojoshader_common.c ...
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