Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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265 lines
16 KiB
265 lines
16 KiB
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] */ |
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#ifndef OPENSSL_HEADER_LHASH_INTERNAL_H |
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#define OPENSSL_HEADER_LHASH_INTERNAL_H |
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#include <openssl/lhash.h> |
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#if defined(__cplusplus) |
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extern "C" { |
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#endif |
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// lhash is a traditional, chaining hash table that automatically expands and |
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// contracts as needed. One should not use the lh_* functions directly, rather |
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// use the type-safe macro wrappers: |
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// |
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// A hash table of a specific type of object has type |LHASH_OF(type)|. This |
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// can be defined (once) with |DEFINE_LHASH_OF(type)| and declared where needed |
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// with |DECLARE_LHASH_OF(type)|. For example: |
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// |
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// struct foo { |
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// int bar; |
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// }; |
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// |
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// DEFINE_LHASH_OF(struct foo) |
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// |
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// Although note that the hash table will contain /pointers/ to |foo|. |
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// |
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// A macro will be defined for each of the |OPENSSL_lh_*| functions below. For |
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// |LHASH_OF(foo)|, the macros would be |lh_foo_new|, |lh_foo_num_items| etc. |
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// lhash_cmp_func is a comparison function that returns a value equal, or not |
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// equal, to zero depending on whether |*a| is equal, or not equal to |*b|, |
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// respectively. Note the difference between this and |stack_cmp_func| in that |
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// this takes pointers to the objects directly. |
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// |
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// This function's actual type signature is int (*)(const T*, const T*). The |
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// low-level |lh_*| functions will be passed a type-specific wrapper to call it |
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// correctly. |
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typedef int (*lhash_cmp_func)(const void *a, const void *b); |
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typedef int (*lhash_cmp_func_helper)(lhash_cmp_func func, const void *a, |
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const void *b); |
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// lhash_hash_func is a function that maps an object to a uniformly distributed |
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// uint32_t. |
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// |
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// This function's actual type signature is uint32_t (*)(const T*). The |
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// low-level |lh_*| functions will be passed a type-specific wrapper to call it |
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// correctly. |
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typedef uint32_t (*lhash_hash_func)(const void *a); |
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typedef uint32_t (*lhash_hash_func_helper)(lhash_hash_func func, const void *a); |
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typedef struct lhash_st _LHASH; |
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// OPENSSL_lh_new returns a new, empty hash table or NULL on error. |
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OPENSSL_EXPORT _LHASH *OPENSSL_lh_new(lhash_hash_func hash, |
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lhash_cmp_func comp); |
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// OPENSSL_lh_free frees the hash table itself but none of the elements. See |
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// |OPENSSL_lh_doall|. |
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OPENSSL_EXPORT void OPENSSL_lh_free(_LHASH *lh); |
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// OPENSSL_lh_num_items returns the number of items in |lh|. |
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OPENSSL_EXPORT size_t OPENSSL_lh_num_items(const _LHASH *lh); |
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// OPENSSL_lh_retrieve finds an element equal to |data| in the hash table and |
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// returns it. If no such element exists, it returns NULL. |
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OPENSSL_EXPORT void *OPENSSL_lh_retrieve(const _LHASH *lh, const void *data, |
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lhash_hash_func_helper call_hash_func, |
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lhash_cmp_func_helper call_cmp_func); |
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// OPENSSL_lh_retrieve_key finds an element matching |key|, given the specified |
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// hash and comparison function. This differs from |OPENSSL_lh_retrieve| in that |
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// the key may be a different type than the values stored in |lh|. |key_hash| |
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// and |cmp_key| must be compatible with the functions passed into |
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// |OPENSSL_lh_new|. |
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OPENSSL_EXPORT void *OPENSSL_lh_retrieve_key(const _LHASH *lh, const void *key, |
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uint32_t key_hash, |
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int (*cmp_key)(const void *key, |
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const void *value)); |
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// OPENSSL_lh_insert inserts |data| into the hash table. If an existing element |
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// is equal to |data| (with respect to the comparison function) then |*old_data| |
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// will be set to that value and it will be replaced. Otherwise, or in the |
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// event of an error, |*old_data| will be set to NULL. It returns one on |
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// success or zero in the case of an allocation error. |
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OPENSSL_EXPORT int OPENSSL_lh_insert(_LHASH *lh, void **old_data, void *data, |
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lhash_hash_func_helper call_hash_func, |
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lhash_cmp_func_helper call_cmp_func); |
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// OPENSSL_lh_delete removes an element equal to |data| from the hash table and |
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// returns it. If no such element is found, it returns NULL. |
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OPENSSL_EXPORT void *OPENSSL_lh_delete(_LHASH *lh, const void *data, |
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lhash_hash_func_helper call_hash_func, |
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lhash_cmp_func_helper call_cmp_func); |
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// OPENSSL_lh_doall_arg calls |func| on each element of the hash table and also |
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// passes |arg| as the second argument. |
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// TODO(fork): rename this |
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OPENSSL_EXPORT void OPENSSL_lh_doall_arg(_LHASH *lh, |
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void (*func)(void *, void *), |
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void *arg); |
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#define DEFINE_LHASH_OF(type) \ |
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/* We disable MSVC C4191 in this macro, which warns when pointers are cast \ |
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* to the wrong type. While the cast itself is valid, it is often a bug \ |
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* because calling it through the cast is UB. However, we never actually \ |
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* call functions as |lhash_cmp_func|. The type is just a type-erased \ |
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* function pointer. (C does not guarantee function pointers fit in \ |
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* |void*|, and GCC will warn on this.) Thus we just disable the false \ |
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* positive warning. */ \ |
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OPENSSL_MSVC_PRAGMA(warning(push)) \ |
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OPENSSL_MSVC_PRAGMA(warning(disable : 4191)) \ |
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\ |
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DECLARE_LHASH_OF(type) \ |
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\ |
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typedef int (*lhash_##type##_cmp_func)(const type *, const type *); \ |
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typedef uint32_t (*lhash_##type##_hash_func)(const type *); \ |
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\ |
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OPENSSL_INLINE int lh_##type##_call_cmp_func(lhash_cmp_func func, \ |
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const void *a, const void *b) { \ |
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return ((lhash_##type##_cmp_func)func)((const type *)a, (const type *)b); \ |
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} \ |
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\ |
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OPENSSL_INLINE uint32_t lh_##type##_call_hash_func(lhash_hash_func func, \ |
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const void *a) { \ |
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return ((lhash_##type##_hash_func)func)((const type *)a); \ |
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} \ |
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\ |
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OPENSSL_INLINE LHASH_OF(type) *lh_##type##_new( \ |
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lhash_##type##_hash_func hash, lhash_##type##_cmp_func comp) { \ |
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return (LHASH_OF(type) *)OPENSSL_lh_new((lhash_hash_func)hash, \ |
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(lhash_cmp_func)comp); \ |
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} \ |
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\ |
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OPENSSL_INLINE void lh_##type##_free(LHASH_OF(type) *lh) { \ |
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OPENSSL_lh_free((_LHASH *)lh); \ |
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} \ |
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\ |
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OPENSSL_INLINE size_t lh_##type##_num_items(const LHASH_OF(type) *lh) { \ |
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return OPENSSL_lh_num_items((const _LHASH *)lh); \ |
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} \ |
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\ |
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OPENSSL_INLINE type *lh_##type##_retrieve(const LHASH_OF(type) *lh, \ |
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const type *data) { \ |
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return (type *)OPENSSL_lh_retrieve((const _LHASH *)lh, data, \ |
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lh_##type##_call_hash_func, \ |
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lh_##type##_call_cmp_func); \ |
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} \ |
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\ |
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typedef struct { \ |
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int (*cmp_key)(const void *key, const type *value); \ |
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const void *key; \ |
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} LHASH_CMP_KEY_##type; \ |
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\ |
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OPENSSL_INLINE int lh_##type##_call_cmp_key(const void *key, \ |
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const void *value) { \ |
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const LHASH_CMP_KEY_##type *cb = (const LHASH_CMP_KEY_##type *)key; \ |
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return cb->cmp_key(cb->key, (const type *)value); \ |
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} \ |
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\ |
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OPENSSL_INLINE type *lh_##type##_retrieve_key( \ |
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const LHASH_OF(type) *lh, const void *key, uint32_t key_hash, \ |
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int (*cmp_key)(const void *key, const type *value)) { \ |
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LHASH_CMP_KEY_##type cb = {cmp_key, key}; \ |
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return (type *)OPENSSL_lh_retrieve_key((const _LHASH *)lh, &cb, key_hash, \ |
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lh_##type##_call_cmp_key); \ |
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} \ |
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\ |
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OPENSSL_INLINE int lh_##type##_insert(LHASH_OF(type) *lh, type **old_data, \ |
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type *data) { \ |
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void *old_data_void = NULL; \ |
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int ret = OPENSSL_lh_insert((_LHASH *)lh, &old_data_void, data, \ |
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lh_##type##_call_hash_func, \ |
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lh_##type##_call_cmp_func); \ |
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*old_data = (type *)old_data_void; \ |
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return ret; \ |
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} \ |
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\ |
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OPENSSL_INLINE type *lh_##type##_delete(LHASH_OF(type) *lh, \ |
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const type *data) { \ |
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return (type *)OPENSSL_lh_delete((_LHASH *)lh, data, \ |
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lh_##type##_call_hash_func, \ |
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lh_##type##_call_cmp_func); \ |
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} \ |
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\ |
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typedef struct { \ |
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void (*doall_arg)(type *, void *); \ |
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void *arg; \ |
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} LHASH_DOALL_##type; \ |
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\ |
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OPENSSL_INLINE void lh_##type##_call_doall_arg(void *value, void *arg) { \ |
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const LHASH_DOALL_##type *cb = (const LHASH_DOALL_##type *)arg; \ |
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cb->doall_arg((type *)value, cb->arg); \ |
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} \ |
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\ |
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OPENSSL_INLINE void lh_##type##_doall_arg( \ |
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LHASH_OF(type) *lh, void (*func)(type *, void *), void *arg) { \ |
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LHASH_DOALL_##type cb = {func, arg}; \ |
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OPENSSL_lh_doall_arg((_LHASH *)lh, lh_##type##_call_doall_arg, &cb); \ |
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} \ |
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\ |
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OPENSSL_MSVC_PRAGMA(warning(pop)) |
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#if defined(__cplusplus) |
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} // extern C |
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#endif |
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#endif // OPENSSL_HEADER_LHASH_INTERNAL_H
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