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zend_hash.h

/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998-2010 Zend Technologies Ltd. (http://www.zend.com) |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        | 
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@zend.com>                                |
   |          Zeev Suraski <zeev@zend.com>                                |
   +----------------------------------------------------------------------+
*/

/* $Id: zend_hash.h 304083 2010-10-05 11:28:56Z dmitry $ */

#ifndef ZEND_HASH_H
#define ZEND_HASH_H

#include <sys/types.h>
#include "zend.h"

#define HASH_KEY_IS_STRING 1
#define HASH_KEY_IS_LONG 2
#define HASH_KEY_NON_EXISTANT 3

#define HASH_UPDATE 		(1<<0)
#define HASH_ADD			(1<<1)
#define HASH_NEXT_INSERT	(1<<2)

#define HASH_DEL_KEY 0
#define HASH_DEL_INDEX 1

typedef ulong (*hash_func_t)(char *arKey, uint nKeyLength);
typedef int  (*compare_func_t)(const void *, const void * TSRMLS_DC);
typedef void (*sort_func_t)(void *, size_t, register size_t, compare_func_t TSRMLS_DC);
typedef void (*dtor_func_t)(void *pDest);
typedef void (*copy_ctor_func_t)(void *pElement);
typedef void (*copy_ctor_param_func_t)(void *pElement, void *pParam);

struct _hashtable;

typedef struct bucket {
	ulong h;						/* Used for numeric indexing */
	uint nKeyLength;
	void *pData;
	void *pDataPtr;
	struct bucket *pListNext;
	struct bucket *pListLast;
	struct bucket *pNext;
	struct bucket *pLast;
	char arKey[1]; /* Must be last element */
} Bucket;

typedef struct _hashtable {
	uint nTableSize;
	uint nTableMask;
	uint nNumOfElements;
	ulong nNextFreeElement;
	Bucket *pInternalPointer;	/* Used for element traversal */
	Bucket *pListHead;
	Bucket *pListTail;
	Bucket **arBuckets;
	dtor_func_t pDestructor;
	zend_bool persistent;
	unsigned char nApplyCount;
	zend_bool bApplyProtection;
#if ZEND_DEBUG
	int inconsistent;
#endif
} HashTable;

typedef struct _zend_hash_key {
	char *arKey;
	uint nKeyLength;
	ulong h;
} zend_hash_key;

typedef zend_bool (*merge_checker_func_t)(HashTable *target_ht, void *source_data, zend_hash_key *hash_key, void *pParam);

typedef Bucket* HashPosition;

BEGIN_EXTERN_C()

/* startup/shutdown */
ZEND_API int _zend_hash_init(HashTable *ht, uint nSize, hash_func_t pHashFunction, dtor_func_t pDestructor, zend_bool persistent ZEND_FILE_LINE_DC);
ZEND_API int _zend_hash_init_ex(HashTable *ht, uint nSize, hash_func_t pHashFunction, dtor_func_t pDestructor, zend_bool persistent, zend_bool bApplyProtection ZEND_FILE_LINE_DC);
ZEND_API void zend_hash_destroy(HashTable *ht);
ZEND_API void zend_hash_clean(HashTable *ht);
#define zend_hash_init(ht, nSize, pHashFunction, pDestructor, persistent)						_zend_hash_init((ht), (nSize), (pHashFunction), (pDestructor), (persistent) ZEND_FILE_LINE_CC)
#define zend_hash_init_ex(ht, nSize, pHashFunction, pDestructor, persistent, bApplyProtection)		_zend_hash_init_ex((ht), (nSize), (pHashFunction), (pDestructor), (persistent), (bApplyProtection) ZEND_FILE_LINE_CC)

/* additions/updates/changes */
ZEND_API int _zend_hash_add_or_update(HashTable *ht, char *arKey, uint nKeyLength, void *pData, uint nDataSize, void **pDest, int flag ZEND_FILE_LINE_DC);
#define zend_hash_update(ht, arKey, nKeyLength, pData, nDataSize, pDest) \
		_zend_hash_add_or_update(ht, arKey, nKeyLength, pData, nDataSize, pDest, HASH_UPDATE ZEND_FILE_LINE_CC)
#define zend_hash_add(ht, arKey, nKeyLength, pData, nDataSize, pDest) \
		_zend_hash_add_or_update(ht, arKey, nKeyLength, pData, nDataSize, pDest, HASH_ADD ZEND_FILE_LINE_CC)

ZEND_API int _zend_hash_quick_add_or_update(HashTable *ht, char *arKey, uint nKeyLength, ulong h, void *pData, uint nDataSize, void **pDest, int flag ZEND_FILE_LINE_DC);
#define zend_hash_quick_update(ht, arKey, nKeyLength, h, pData, nDataSize, pDest) \
		_zend_hash_quick_add_or_update(ht, arKey, nKeyLength, h, pData, nDataSize, pDest, HASH_UPDATE ZEND_FILE_LINE_CC)
#define zend_hash_quick_add(ht, arKey, nKeyLength, h, pData, nDataSize, pDest) \
		_zend_hash_quick_add_or_update(ht, arKey, nKeyLength, h, pData, nDataSize, pDest, HASH_ADD ZEND_FILE_LINE_CC)

ZEND_API int _zend_hash_index_update_or_next_insert(HashTable *ht, ulong h, void *pData, uint nDataSize, void **pDest, int flag ZEND_FILE_LINE_DC);
#define zend_hash_index_update(ht, h, pData, nDataSize, pDest) \
		_zend_hash_index_update_or_next_insert(ht, h, pData, nDataSize, pDest, HASH_UPDATE ZEND_FILE_LINE_CC)
#define zend_hash_next_index_insert(ht, pData, nDataSize, pDest) \
		_zend_hash_index_update_or_next_insert(ht, 0, pData, nDataSize, pDest, HASH_NEXT_INSERT ZEND_FILE_LINE_CC)

ZEND_API int zend_hash_add_empty_element(HashTable *ht, char *arKey, uint nKeyLength);

#define ZEND_HASH_APPLY_KEEP				0
#define ZEND_HASH_APPLY_REMOVE				1<<0
#define ZEND_HASH_APPLY_STOP				1<<1

typedef int (*apply_func_t)(void *pDest TSRMLS_DC);
typedef int (*apply_func_arg_t)(void *pDest, void *argument TSRMLS_DC);
typedef int (*apply_func_args_t)(void *pDest, int num_args, va_list args, zend_hash_key *hash_key);

ZEND_API void zend_hash_graceful_destroy(HashTable *ht);
ZEND_API void zend_hash_graceful_reverse_destroy(HashTable *ht);
ZEND_API void zend_hash_apply(HashTable *ht, apply_func_t apply_func TSRMLS_DC);
ZEND_API void zend_hash_apply_with_argument(HashTable *ht, apply_func_arg_t apply_func, void * TSRMLS_DC);
ZEND_API void zend_hash_apply_with_arguments(HashTable *ht, apply_func_args_t apply_func, int, ...);

/* This function should be used with special care (in other words,
 * it should usually not be used).  When used with the ZEND_HASH_APPLY_STOP
 * return value, it assumes things about the order of the elements in the hash.
 * Also, it does not provide the same kind of reentrancy protection that
 * the standard apply functions do.
 */
ZEND_API void zend_hash_reverse_apply(HashTable *ht, apply_func_t apply_func TSRMLS_DC);

/* Deletes */
ZEND_API int zend_hash_del_key_or_index(HashTable *ht, char *arKey, uint nKeyLength, ulong h, int flag);
#define zend_hash_del(ht, arKey, nKeyLength) \
		zend_hash_del_key_or_index(ht, arKey, nKeyLength, 0, HASH_DEL_KEY)
#define zend_hash_index_del(ht, h) \
		zend_hash_del_key_or_index(ht, NULL, 0, h, HASH_DEL_INDEX)

ZEND_API ulong zend_get_hash_value(char *arKey, uint nKeyLength);

/* Data retreival */
ZEND_API int zend_hash_find(HashTable *ht, char *arKey, uint nKeyLength, void **pData);
ZEND_API int zend_hash_quick_find(HashTable *ht, char *arKey, uint nKeyLength, ulong h, void **pData);
ZEND_API int zend_hash_index_find(HashTable *ht, ulong h, void **pData);

/* Misc */
ZEND_API int zend_hash_exists(HashTable *ht, char *arKey, uint nKeyLength);
ZEND_API int zend_hash_quick_exists(HashTable *ht, char *arKey, uint nKeyLength, ulong h);
ZEND_API int zend_hash_index_exists(HashTable *ht, ulong h);
ZEND_API ulong zend_hash_next_free_element(HashTable *ht);

/* traversing */
#define zend_hash_has_more_elements_ex(ht, pos) \
	(zend_hash_get_current_key_type_ex(ht, pos) == HASH_KEY_NON_EXISTANT ? FAILURE : SUCCESS)
ZEND_API int zend_hash_move_forward_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_move_backwards_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_get_current_key_ex(HashTable *ht, char **str_index, uint *str_length, ulong *num_index, zend_bool duplicate, HashPosition *pos);
ZEND_API int zend_hash_get_current_key_type_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_get_current_data_ex(HashTable *ht, void **pData, HashPosition *pos);
ZEND_API void zend_hash_internal_pointer_reset_ex(HashTable *ht, HashPosition *pos);
ZEND_API void zend_hash_internal_pointer_end_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, char *str_index, uint str_length, ulong num_index, HashPosition *pos);

typedef struct _HashPointer {
	HashPosition pos;
	ulong h;
} HashPointer;

ZEND_API int zend_hash_get_pointer(HashTable *ht, HashPointer *ptr);
ZEND_API int zend_hash_set_pointer(HashTable *ht, const HashPointer *ptr);

#define zend_hash_has_more_elements(ht) \
	zend_hash_has_more_elements_ex(ht, NULL)
#define zend_hash_move_forward(ht) \
	zend_hash_move_forward_ex(ht, NULL)
#define zend_hash_move_backwards(ht) \
	zend_hash_move_backwards_ex(ht, NULL)
#define zend_hash_get_current_key(ht, str_index, num_index, duplicate) \
	zend_hash_get_current_key_ex(ht, str_index, NULL, num_index, duplicate, NULL)
#define zend_hash_get_current_key_type(ht) \
	zend_hash_get_current_key_type_ex(ht, NULL)
#define zend_hash_get_current_data(ht, pData) \
	zend_hash_get_current_data_ex(ht, pData, NULL)
#define zend_hash_internal_pointer_reset(ht) \
	zend_hash_internal_pointer_reset_ex(ht, NULL)
#define zend_hash_internal_pointer_end(ht) \
	zend_hash_internal_pointer_end_ex(ht, NULL)
#define zend_hash_update_current_key(ht, key_type, str_index, str_length, num_index) \
	zend_hash_update_current_key_ex(ht, key_type, str_index, str_length, num_index, NULL)

/* Copying, merging and sorting */
ZEND_API void zend_hash_copy(HashTable *target, HashTable *source, copy_ctor_func_t pCopyConstructor, void *tmp, uint size);
ZEND_API void _zend_hash_merge(HashTable *target, HashTable *source, copy_ctor_func_t pCopyConstructor, void *tmp, uint size, int overwrite ZEND_FILE_LINE_DC);
ZEND_API void zend_hash_merge_ex(HashTable *target, HashTable *source, copy_ctor_func_t pCopyConstructor, uint size, merge_checker_func_t pMergeSource, void *pParam);
ZEND_API int zend_hash_sort(HashTable *ht, sort_func_t sort_func, compare_func_t compare_func, int renumber TSRMLS_DC);
ZEND_API int zend_hash_compare(HashTable *ht1, HashTable *ht2, compare_func_t compar, zend_bool ordered TSRMLS_DC);
ZEND_API int zend_hash_minmax(HashTable *ht, compare_func_t compar, int flag, void **pData TSRMLS_DC);

#define zend_hash_merge(target, source, pCopyConstructor, tmp, size, overwrite)					\
	_zend_hash_merge(target, source, pCopyConstructor, tmp, size, overwrite ZEND_FILE_LINE_CC)

ZEND_API int zend_hash_num_elements(HashTable *ht);

ZEND_API int zend_hash_rehash(HashTable *ht);

/*
 * DJBX33A (Daniel J. Bernstein, Times 33 with Addition)
 *
 * This is Daniel J. Bernstein's popular `times 33' hash function as
 * posted by him years ago on comp.lang.c. It basically uses a function
 * like ``hash(i) = hash(i-1) * 33 + str[i]''. This is one of the best
 * known hash functions for strings. Because it is both computed very
 * fast and distributes very well.
 *
 * The magic of number 33, i.e. why it works better than many other
 * constants, prime or not, has never been adequately explained by
 * anyone. So I try an explanation: if one experimentally tests all
 * multipliers between 1 and 256 (as RSE did now) one detects that even
 * numbers are not useable at all. The remaining 128 odd numbers
 * (except for the number 1) work more or less all equally well. They
 * all distribute in an acceptable way and this way fill a hash table
 * with an average percent of approx. 86%. 
 *
 * If one compares the Chi^2 values of the variants, the number 33 not
 * even has the best value. But the number 33 and a few other equally
 * good numbers like 17, 31, 63, 127 and 129 have nevertheless a great
 * advantage to the remaining numbers in the large set of possible
 * multipliers: their multiply operation can be replaced by a faster
 * operation based on just one shift plus either a single addition
 * or subtraction operation. And because a hash function has to both
 * distribute good _and_ has to be very fast to compute, those few
 * numbers should be preferred and seems to be the reason why Daniel J.
 * Bernstein also preferred it.
 *
 *
 *                  -- Ralf S. Engelschall <rse@engelschall.com>
 */

static inline ulong zend_inline_hash_func(char *arKey, uint nKeyLength)
{
	register ulong hash = 5381;

/* variant with the hash unrolled eight times */
	for (; nKeyLength >= 8; nKeyLength -= 8) {
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
		hash = ((hash << 5) + hash) + *arKey++;
	}
	switch (nKeyLength) {
		case 7: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
		case 6: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
		case 5: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
		case 4: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
		case 3: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
		case 2: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
		case 1: hash = ((hash << 5) + hash) + *arKey++; break;
		case 0: break;
EMPTY_SWITCH_DEFAULT_CASE()
	}
	return hash;
}

ZEND_API ulong zend_hash_func(char *arKey, uint nKeyLength);

#if ZEND_DEBUG
/* debug */
void zend_hash_display_pListTail(HashTable *ht);
void zend_hash_display(HashTable *ht);
#endif

END_EXTERN_C()

#define ZEND_INIT_SYMTABLE(ht)								\
	ZEND_INIT_SYMTABLE_EX(ht, 2, 0)

#define ZEND_INIT_SYMTABLE_EX(ht, n, persistent)			\
	zend_hash_init(ht, n, NULL, ZVAL_PTR_DTOR, persistent)

#define HANDLE_NUMERIC(key, length, func) do {								\
	register const char *tmp = key;											\
																			\
	if (*tmp == '-') {														\
		tmp++;																\
	}																		\
	if (*tmp >= '0' && *tmp <= '9') { /* possibly a numeric index */		\
		const char *end = key + length - 1;									\
		ulong idx;															\
																			\
		if ((*end != '\0') /* not a null terminated string */				\
		 || (*tmp == '0' && length > 2) /* numbers with leading zeros */	\
		 || (end - tmp > MAX_LENGTH_OF_LONG - 1) /* number too long */		\
		 || (SIZEOF_LONG == 4 &&											\
		     end - tmp == MAX_LENGTH_OF_LONG - 1 &&							\
		     *tmp > '2')) { /* overflow */									\
			break;															\
		}																	\
		idx = (*tmp - '0');													\
		while (++tmp != end && *tmp >= '0' && *tmp <= '9') {				\
			idx = (idx * 10) + (*tmp - '0');								\
		}																	\
		if (tmp == end) {													\
			if (*key == '-') {												\
				if (idx-1 > LONG_MAX) { /* overflow */						\
					break;													\
				}															\
				idx = (ulong)(-(long)idx);									\
			} else if (idx > LONG_MAX) { /* overflow */						\
				break;														\
			}																\
			return func;													\
		}																	\
	}																		\
} while (0)

static inline int zend_symtable_update(HashTable *ht, char *arKey, uint nKeyLength, void *pData, uint nDataSize, void **pDest)					\
{
	HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_update(ht, idx, pData, nDataSize, pDest));
	return zend_hash_update(ht, arKey, nKeyLength, pData, nDataSize, pDest);
}

static inline int zend_symtable_del(HashTable *ht, char *arKey, uint nKeyLength)
{
	HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_del(ht, idx));
	return zend_hash_del(ht, arKey, nKeyLength);
}

static inline int zend_symtable_find(HashTable *ht, char *arKey, uint nKeyLength, void **pData)
{
	HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_find(ht, idx, pData));
	return zend_hash_find(ht, arKey, nKeyLength, pData);
}

static inline int zend_symtable_exists(HashTable *ht, char *arKey, uint nKeyLength)
{
	HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_exists(ht, idx));
	return zend_hash_exists(ht, arKey, nKeyLength);
}

static inline int zend_symtable_update_current_key(HashTable *ht, char *arKey, uint nKeyLength)
{
	HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_update_current_key(ht, HASH_KEY_IS_LONG, NULL, 0, idx));
	return zend_hash_update_current_key(ht, HASH_KEY_IS_STRING, arKey, nKeyLength, 0);
}

#endif							/* ZEND_HASH_H */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * indent-tabs-mode: t
 * End:
 */

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-11-16 11:22:23
..	dir	-	0755	2025-11-16 11:22:23
FlexLexer.h	file	5.53 KB	0644	2025-07-09 06:28:27
acconfig.h	file	3.21 KB	0644	2025-07-09 06:28:27
zend.h	file	21.07 KB	0644	2025-07-09 06:28:27
zend_API.h	file	34.03 KB	0644	2025-07-09 06:28:27
zend_alloc.h	file	11.52 KB	0644	2025-07-09 06:28:27
zend_builtin_functions.h	file	1.65 KB	0644	2025-07-09 06:28:27
zend_compile.h	file	25.11 KB	0644	2025-07-09 06:28:27
zend_config.h	file	107 B	0644	2025-07-09 06:28:28
zend_config.nw.h	file	2.5 KB	0644	2025-07-09 06:28:27
zend_config.w32.h	file	3.03 KB	0644	2025-07-09 06:28:27
zend_constants.h	file	4.16 KB	0644	2025-07-09 06:28:27
zend_dynamic_array.h	file	1.92 KB	0644	2025-07-09 06:28:27
zend_errors.h	file	2.05 KB	0644	2025-07-09 06:28:27
zend_exceptions.h	file	2.79 KB	0644	2025-07-09 06:28:27
zend_execute.h	file	8.13 KB	0644	2025-07-09 06:28:27
zend_extensions.h	file	4.32 KB	0644	2025-07-09 06:28:27
zend_fast_cache.h	file	4.08 KB	0644	2025-07-09 06:28:27
zend_globals.h	file	6.65 KB	0644	2025-07-09 06:28:27
zend_globals_macros.h	file	3.12 KB	0644	2025-07-09 06:28:27
zend_hash.h	file	16.25 KB	0644	2025-07-09 06:28:27
zend_highlight.h	file	2.47 KB	0644	2025-07-09 06:28:27
zend_indent.h	file	1.49 KB	0644	2025-07-09 06:28:27
zend_ini.h	file	9.52 KB	0644	2025-07-09 06:28:27
zend_ini_parser.h	file	2.32 KB	0644	2025-07-09 06:28:28
zend_ini_scanner.h	file	1.79 KB	0644	2025-07-09 06:28:28
zend_interfaces.h	file	3.47 KB	0644	2025-07-09 06:28:27
zend_istdiostream.h	file	1.67 KB	0644	2025-07-09 06:28:27
zend_iterators.h	file	3.66 KB	0644	2025-07-09 06:28:27
zend_language_parser.h	file	7.39 KB	0644	2025-07-09 06:28:28
zend_language_scanner.h	file	2.31 KB	0644	2025-07-09 06:28:28
zend_list.h	file	5.09 KB	0644	2025-07-09 06:28:27
zend_llist.h	file	3.94 KB	0644	2025-07-09 06:28:27
zend_modules.h	file	5.04 KB	0644	2025-07-09 06:28:27
zend_multibyte.h	file	3.61 KB	0644	2025-07-09 06:28:27
zend_multiply.h	file	2.08 KB	0644	2025-07-09 06:28:27
zend_object_handlers.h	file	8.01 KB	0644	2025-07-09 06:28:27
zend_objects.h	file	2.21 KB	0644	2025-07-09 06:28:27
zend_objects_API.h	file	4.03 KB	0644	2025-07-09 06:28:27
zend_operators.h	file	14.66 KB	0644	2025-07-09 06:28:28
zend_ptr_stack.h	file	3.92 KB	0644	2025-07-09 06:28:28
zend_qsort.h	file	1.48 KB	0644	2025-07-09 06:28:28
zend_stack.h	file	2.34 KB	0644	2025-07-09 06:28:28
zend_static_allocator.h	file	1.88 KB	0644	2025-07-09 06:28:28
zend_stream.h	file	2.48 KB	0644	2025-07-09 06:28:28
zend_strtod.h	file	1.79 KB	0644	2025-07-09 06:28:28
zend_ts_hash.h	file	6.77 KB	0644	2025-07-09 06:28:28
zend_types.h	file	1.96 KB	0644	2025-07-09 06:28:28
zend_variables.h	file	4.03 KB	0644	2025-07-09 06:28:28
zend_vm.h	file	1.4 KB	0644	2025-07-09 06:28:28
zend_vm_def.h	file	115.13 KB	0644	2025-07-09 06:28:28
zend_vm_execute.h	file	920.75 KB	0644	2025-07-09 06:28:28
zend_vm_opcodes.h	file	6.43 KB	0644	2025-07-09 06:28:28