dict.c

libxml,在UNIX/LINUX下非常重要的一个库,为XML相关应用提供方便.目前上载的是最新版本,若要取得最新版本,请参考里面的readme.

	while (iter) {
	    next = iter->next;

	    /*
	     * put back the entry in the new dict
	     */

	    key = xmlDictComputeKey(iter->name, iter->len) % dict->size;
	    if (dict->dict[key].valid == 0) {
		memcpy(&(dict->dict[key]), iter, sizeof(xmlDictEntry));
		dict->dict[key].next = NULL;
		dict->dict[key].valid = 1;
		xmlFree(iter);
	    } else {
	    	iter->next = dict->dict[key].next;
	    	dict->dict[key].next = iter;
	    }

#ifdef DEBUG_GROW
	    nbElem++;
#endif

	    iter = next;
	}
    }

    xmlFree(olddict);

#ifdef DEBUG_GROW
    xmlGenericError(xmlGenericErrorContext,
	    "xmlDictGrow : from %d to %d, %d elems\n", oldsize, size, nbElem);
#endif

    return(0);
}

/**
 * xmlDictFree:
 * @dict: the dictionnary
 *
 * Free the hash @dict and its contents. The userdata is
 * deallocated with @f if provided.
 */
void
xmlDictFree(xmlDictPtr dict) {
    int i;
    xmlDictEntryPtr iter;
    xmlDictEntryPtr next;
    int inside_dict = 0;
    xmlDictStringsPtr pool, nextp;

    if (dict == NULL)
	return;

    if (!xmlDictInitialized)
        if (!xmlInitializeDict())
            return;

    /* decrement the counter, it may be shared by a parser and docs */
    xmlRMutexLock(xmlDictMutex);
    dict->ref_counter--;
    if (dict->ref_counter > 0) {
        xmlRMutexUnlock(xmlDictMutex);
        return;
    }

    xmlRMutexUnlock(xmlDictMutex);

    if (dict->subdict != NULL) {
        xmlDictFree(dict->subdict);
    }

    if (dict->dict) {
	for(i = 0; ((i < dict->size) && (dict->nbElems > 0)); i++) {
	    iter = &(dict->dict[i]);
	    if (iter->valid == 0)
		continue;
	    inside_dict = 1;
	    while (iter) {
		next = iter->next;
		if (!inside_dict)
		    xmlFree(iter);
		dict->nbElems--;
		inside_dict = 0;
		iter = next;
	    }
	    inside_dict = 0;
	}
	xmlFree(dict->dict);
    }
    pool = dict->strings;
    while (pool != NULL) {
        nextp = pool->next;
	xmlFree(pool);
	pool = nextp;
    }
    xmlFreeRMutex(dict->mutex);
    xmlFree(dict);
}

/**
 * xmlDictLookup:
 * @dict: the dictionnary
 * @name: the name of the userdata
 * @len: the length of the name, if -1 it is recomputed
 *
 * Add the @name to the dictionnary @dict if not present.
 *
 * Returns the internal copy of the name or NULL in case of internal error
 */
const xmlChar *
xmlDictLookup(xmlDictPtr dict, const xmlChar *name, int len) {
    unsigned long key, okey, nbi = 0;
    xmlDictEntryPtr entry;
    xmlDictEntryPtr insert;
    const xmlChar *ret;

    if ((dict == NULL) || (name == NULL))
	return(NULL);

    if (len < 0)
        len = xmlStrlen(name);

    /*
     * Check for duplicate and insertion location.
     */
    okey = xmlDictComputeKey(name, len);
    key = okey % dict->size;
    if (dict->dict[key].valid == 0) {
	insert = NULL;
    } else {
	for (insert = &(dict->dict[key]); insert->next != NULL;
	     insert = insert->next) {
#ifdef __GNUC__
	    if (insert->len == len) {
		if (!memcmp(insert->name, name, len))
		    return(insert->name);
	    }
#else
	    if ((insert->len == len) &&
	        (!xmlStrncmp(insert->name, name, len)))
		return(insert->name);
#endif
	    nbi++;
	}
#ifdef __GNUC__
	if (insert->len == len) {
	    if (!memcmp(insert->name, name, len))
		return(insert->name);
	}
#else
	if ((insert->len == len) &&
	    (!xmlStrncmp(insert->name, name, len)))
	    return(insert->name);
#endif
    }

    if (dict->subdict) {
	key = okey % dict->subdict->size;
	if (dict->subdict->dict[key].valid != 0) {
	    xmlDictEntryPtr tmp;

	    for (tmp = &(dict->subdict->dict[key]); tmp->next != NULL;
		 tmp = tmp->next) {
#ifdef __GNUC__
		if (tmp->len == len) {
		    if (!memcmp(tmp->name, name, len))
			return(tmp->name);
		}
#else
		if ((tmp->len == len) &&
		    (!xmlStrncmp(tmp->name, name, len)))
		    return(tmp->name);
#endif
		nbi++;
	    }
#ifdef __GNUC__
	    if (tmp->len == len) {
		if (!memcmp(tmp->name, name, len))
		    return(tmp->name);
	    }
#else
	    if ((tmp->len == len) &&
		(!xmlStrncmp(tmp->name, name, len)))
		return(tmp->name);
#endif
	}
	key = okey % dict->size;
    }

    ret = xmlDictAddString(dict, name, len);
    if (ret == NULL)
        return(NULL);
    if (insert == NULL) {
	entry = &(dict->dict[key]);
    } else {
	entry = xmlMalloc(sizeof(xmlDictEntry));
	if (entry == NULL)
	     return(NULL);
    }
    entry->name = ret;
    entry->len = len;
    entry->next = NULL;
    entry->valid = 1;


    if (insert != NULL) 
	insert->next = entry;

    dict->nbElems++;

    if ((nbi > MAX_HASH_LEN) &&
        (dict->size <= ((MAX_DICT_HASH / 2) / MAX_HASH_LEN)))
	xmlDictGrow(dict, MAX_HASH_LEN * 2 * dict->size);
    /* Note that entry may have been freed at this point by xmlDictGrow */

    return(ret);
}

/**
 * xmlDictExists:
 * @dict: the dictionnary
 * @name: the name of the userdata
 * @len: the length of the name, if -1 it is recomputed
 *
 * Check if the @name exists in the dictionnary @dict.
 *
 * Returns the internal copy of the name or NULL if not found.
 */
const xmlChar *
xmlDictExists(xmlDictPtr dict, const xmlChar *name, int len) {
    unsigned long key, okey, nbi = 0;
    xmlDictEntryPtr insert;

    if ((dict == NULL) || (name == NULL))
	return(NULL);

    if (len < 0)
        len = xmlStrlen(name);

    /*
     * Check for duplicate and insertion location.
     */
    okey = xmlDictComputeKey(name, len);
    key = okey % dict->size;
    if (dict->dict[key].valid == 0) {
	insert = NULL;
    } else {
	for (insert = &(dict->dict[key]); insert->next != NULL;
	     insert = insert->next) {
#ifdef __GNUC__
	    if (insert->len == len) {
		if (!memcmp(insert->name, name, len))
		    return(insert->name);
	    }
#else
	    if ((insert->len == len) &&
	        (!xmlStrncmp(insert->name, name, len)))
		return(insert->name);
#endif
	    nbi++;
	}
#ifdef __GNUC__
	if (insert->len == len) {
	    if (!memcmp(insert->name, name, len))
		return(insert->name);
	}
#else
	if ((insert->len == len) &&
	    (!xmlStrncmp(insert->name, name, len)))
	    return(insert->name);
#endif
    }

    if (dict->subdict) {
	key = okey % dict->subdict->size;
	if (dict->subdict->dict[key].valid != 0) {
	    xmlDictEntryPtr tmp;

	    for (tmp = &(dict->subdict->dict[key]); tmp->next != NULL;
		 tmp = tmp->next) {
#ifdef __GNUC__
		if (tmp->len == len) {
		    if (!memcmp(tmp->name, name, len))
			return(tmp->name);
		}
#else
		if ((tmp->len == len) &&
		    (!xmlStrncmp(tmp->name, name, len)))
		    return(tmp->name);
#endif
		nbi++;
	    }
#ifdef __GNUC__
	    if (tmp->len == len) {
		if (!memcmp(tmp->name, name, len))
		    return(tmp->name);
	    }
#else
	    if ((tmp->len == len) &&
		(!xmlStrncmp(tmp->name, name, len)))
		return(tmp->name);
#endif
	}
	key = okey % dict->size;
    }

    /* not found */
    return(NULL);
}

/**
 * xmlDictQLookup:
 * @dict: the dictionnary
 * @prefix: the prefix 
 * @name: the name
 *
 * Add the QName @prefix:@name to the hash @dict if not present.
 *
 * Returns the internal copy of the QName or NULL in case of internal error
 */
const xmlChar *
xmlDictQLookup(xmlDictPtr dict, const xmlChar *prefix, const xmlChar *name) {
    unsigned long okey, key, nbi = 0;
    xmlDictEntryPtr entry;
    xmlDictEntryPtr insert;
    const xmlChar *ret;
    int len;

    if ((dict == NULL) || (name == NULL))
	return(NULL);

    len = xmlStrlen(name);
    if (prefix != NULL)
        len += 1 + xmlStrlen(prefix);

    /*
     * Check for duplicate and insertion location.
     */
    okey = xmlDictComputeQKey(prefix, name, len);
    key = okey % dict->size;
    if (dict->dict[key].valid == 0) {
	insert = NULL;
    } else {
	for (insert = &(dict->dict[key]); insert->next != NULL;
	     insert = insert->next) {
	    if ((insert->len == len) &&
	        (xmlStrQEqual(prefix, name, insert->name)))
		return(insert->name);
	    nbi++;
	}
	if ((insert->len == len) &&
	    (xmlStrQEqual(prefix, name, insert->name)))
	    return(insert->name);
    }

    if (dict->subdict) {
	key = okey % dict->subdict->size;
	if (dict->subdict->dict[key].valid != 0) {
	    xmlDictEntryPtr tmp;
	    for (tmp = &(dict->subdict->dict[key]); tmp->next != NULL;
		 tmp = tmp->next) {
		if ((tmp->len == len) &&
		    (xmlStrQEqual(prefix, name, tmp->name)))
		    return(tmp->name);
		nbi++;
	    }
	    if ((tmp->len == len) &&
		(xmlStrQEqual(prefix, name, tmp->name)))
		return(tmp->name);
	}
	key = okey % dict->size;
    }

    ret = xmlDictAddQString(dict, prefix, name, len);
    if (ret == NULL)
        return(NULL);
    if (insert == NULL) {
	entry = &(dict->dict[key]);
    } else {
	entry = xmlMalloc(sizeof(xmlDictEntry));
	if (entry == NULL)
	     return(NULL);
    }
    entry->name = ret;
    entry->len = len;
    entry->next = NULL;
    entry->valid = 1;

    if (insert != NULL) 
	insert->next = entry;

    dict->nbElems++;

    if ((nbi > MAX_HASH_LEN) &&
        (dict->size <= ((MAX_DICT_HASH / 2) / MAX_HASH_LEN)))
	xmlDictGrow(dict, MAX_HASH_LEN * 2 * dict->size);
    /* Note that entry may have been freed at this point by xmlDictGrow */

    return(ret);
}

/**
 * xmlDictOwns:
 * @dict: the dictionnary
 * @str: the string
 *
 * check if a string is owned by the disctionary
 *
 * Returns 1 if true, 0 if false and -1 in case of error
 * -1 in case of error
 */
int
xmlDictOwns(xmlDictPtr dict, const xmlChar *str) {
    xmlDictStringsPtr pool;

    if ((dict == NULL) || (str == NULL))
	return(-1);
    pool = dict->strings;
    while (pool != NULL) {
        if ((str >= &pool->array[0]) && (str <= pool->free))
	    return(1);
	pool = pool->next;
    }
    if (dict->subdict)
        return(xmlDictOwns(dict->subdict, str));
    return(0);
}

/**
 * xmlDictSize:
 * @dict: the dictionnary
 *
 * Query the number of elements installed in the hash @dict.
 *
 * Returns the number of elements in the dictionnary or
 * -1 in case of error
 */
int
xmlDictSize(xmlDictPtr dict) {
    if (dict == NULL)
	return(-1);
    if (dict->subdict)
        return(dict->nbElems + dict->subdict->nbElems);
    return(dict->nbElems);
}


#define bottom_dict
#include "elfgcchack.h"