193 lines
7.9 KiB
C
193 lines
7.9 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
|
* All rights reserved.
|
|
*
|
|
* This package is an SSL implementation written
|
|
* by Eric Young (eay@cryptsoft.com).
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
|
*
|
|
* This library is free for commercial and non-commercial use as long as
|
|
* the following conditions are aheared to. The following conditions
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
|
* included with this distribution is covered by the same copyright terms
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed.
|
|
* If this package is used in a product, Eric Young should be given attribution
|
|
* as the author of the parts of the library used.
|
|
* This can be in the form of a textual message at program startup or
|
|
* in documentation (online or textual) provided with the package.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* "This product includes cryptographic software written by
|
|
* Eric Young (eay@cryptsoft.com)"
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
|
* being used are not cryptographic related :-).
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
|
* the apps directory (application code) you must include an acknowledgement:
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* The licence and distribution terms for any publically available version or
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
|
* copied and put under another distribution licence
|
|
* [including the GNU Public Licence.] */
|
|
|
|
#ifndef OPENSSL_HEADER_LHASH_H
|
|
#define OPENSSL_HEADER_LHASH_H
|
|
|
|
#include <openssl/base.h>
|
|
#include <openssl/type_check.h>
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/* lhash is a traditional, chaining hash table that automatically expands and
|
|
* contracts as needed. One should not use the lh_* functions directly, rather
|
|
* use the type-safe macro wrappers:
|
|
*
|
|
* A hash table of a specific type of object has type |LHASH_OF(type)|. This
|
|
* can be defined (once) with |DEFINE_LHASH_OF(type)| and declared where needed
|
|
* with |DECLARE_LHASH_OF(type)|. For example:
|
|
*
|
|
* struct foo {
|
|
* int bar;
|
|
* };
|
|
*
|
|
* DEFINE_LHASH_OF(struct foo);
|
|
*
|
|
* Although note that the hash table will contain /pointers/ to |foo|.
|
|
*
|
|
* A macro will be defined for each of the lh_* functions below. For
|
|
* LHASH_OF(foo), the macros would be lh_foo_new, lh_foo_num_items etc. */
|
|
|
|
|
|
#define LHASH_OF(type) struct lhash_st_##type
|
|
|
|
#define DEFINE_LHASH_OF(type) LHASH_OF(type) { int dummy; }
|
|
|
|
#define DECLARE_LHASH_OF(type) LHASH_OF(type);
|
|
|
|
/* The make_macros.sh script in this directory parses the following lines and
|
|
* generates the lhash_macros.h file that contains macros for the following
|
|
* types of stacks:
|
|
*
|
|
* LHASH_OF:ASN1_OBJECT
|
|
* LHASH_OF:CONF_VALUE
|
|
* LHASH_OF:SSL_SESSION */
|
|
|
|
#define IN_LHASH_H
|
|
#include <openssl/lhash_macros.h>
|
|
#undef IN_LHASH_H
|
|
|
|
|
|
/* lhash_item_st is an element of a hash chain. It points to the opaque data
|
|
* for this element and to the next item in the chain. The linked-list is NULL
|
|
* terminated. */
|
|
typedef struct lhash_item_st {
|
|
void *data;
|
|
struct lhash_item_st *next;
|
|
/* hash contains the cached, hash value of |data|. */
|
|
uint32_t hash;
|
|
} LHASH_ITEM;
|
|
|
|
/* lhash_cmp_func is a comparison function that returns a value equal, or not
|
|
* equal, to zero depending on whether |*a| is equal, or not equal to |*b|,
|
|
* respectively. Note the difference between this and |stack_cmp_func| in that
|
|
* this takes pointers to the objects directly. */
|
|
typedef int (*lhash_cmp_func)(const void *a, const void *b);
|
|
|
|
/* lhash_hash_func is a function that maps an object to a uniformly distributed
|
|
* uint32_t. */
|
|
typedef uint32_t (*lhash_hash_func)(const void *a);
|
|
|
|
typedef struct lhash_st {
|
|
/* num_items contains the total number of items in the hash table. */
|
|
size_t num_items;
|
|
/* buckets is an array of |num_buckets| pointers. Each points to the head of
|
|
* a chain of LHASH_ITEM objects that have the same hash value, mod
|
|
* |num_buckets|. */
|
|
LHASH_ITEM **buckets;
|
|
/* num_buckets contains the length of |buckets|. This value is always >=
|
|
* kMinNumBuckets. */
|
|
size_t num_buckets;
|
|
/* callback_depth contains the current depth of |lh_doall| or |lh_doall_arg|
|
|
* calls. If non-zero then this suppresses resizing of the |buckets| array,
|
|
* which would otherwise disrupt the iteration. */
|
|
unsigned callback_depth;
|
|
|
|
lhash_cmp_func comp;
|
|
lhash_hash_func hash;
|
|
} _LHASH;
|
|
|
|
/* lh_new returns a new, empty hash table or NULL on error. If |comp| is NULL,
|
|
* |strcmp| will be used. If |hash| is NULL, a generic hash function will be
|
|
* used. */
|
|
OPENSSL_EXPORT _LHASH *lh_new(lhash_hash_func hash, lhash_cmp_func comp);
|
|
|
|
/* lh_free frees the hash table itself but none of the elements. See
|
|
* |lh_doall|. */
|
|
OPENSSL_EXPORT void lh_free(_LHASH *lh);
|
|
|
|
/* lh_num_items returns the number of items in |lh|. */
|
|
OPENSSL_EXPORT size_t lh_num_items(const _LHASH *lh);
|
|
|
|
/* lh_retrieve finds an element equal to |data| in the hash table and returns
|
|
* it. If no such element exists, it returns NULL. */
|
|
OPENSSL_EXPORT void *lh_retrieve(const _LHASH *lh, const void *data);
|
|
|
|
/* lh_insert inserts |data| into the hash table. If an existing element is
|
|
* equal to |data| (with respect to the comparison function) then |*old_data|
|
|
* will be set to that value and it will be replaced. Otherwise, or in the
|
|
* event of an error, |*old_data| will be set to NULL. It returns one on
|
|
* success or zero in the case of an allocation error. */
|
|
OPENSSL_EXPORT int lh_insert(_LHASH *lh, void **old_data, void *data);
|
|
|
|
/* lh_delete removes an element equal to |data| from the hash table and returns
|
|
* it. If no such element is found, it returns NULL. */
|
|
OPENSSL_EXPORT void *lh_delete(_LHASH *lh, const void *data);
|
|
|
|
/* lh_doall calls |func| on each element of the hash table.
|
|
* TODO(fork): rename this */
|
|
OPENSSL_EXPORT void lh_doall(_LHASH *lh, void (*func)(void *));
|
|
|
|
/* lh_doall_arg calls |func| on each element of the hash table and also passes
|
|
* |arg| as the second argument.
|
|
* TODO(fork): rename this */
|
|
OPENSSL_EXPORT void lh_doall_arg(_LHASH *lh, void (*func)(void *, void *),
|
|
void *arg);
|
|
|
|
/* lh_strhash is the default hash function which processes NUL-terminated
|
|
* strings. */
|
|
OPENSSL_EXPORT uint32_t lh_strhash(const char *c);
|
|
|
|
|
|
#if defined(__cplusplus)
|
|
} /* extern C */
|
|
#endif
|
|
|
|
#endif /* OPENSSL_HEADER_STACK_H */
|