| /* 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_STACK_H |
| #define OPENSSL_HEADER_STACK_H |
| |
| #include <openssl/base.h> |
| |
| #include <openssl/type_check.h> |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| // A stack, in OpenSSL, is an array of pointers. They are the most commonly |
| // used collection object. |
| // |
| // This file defines macros for type safe use of the stack functions. A stack |
| // of a specific type of object has type |STACK_OF(type)|. This can be defined |
| // (once) with |DEFINE_STACK_OF(type)| and declared where needed with |
| // |DECLARE_STACK_OF(type)|. For example: |
| // |
| // typedef struct foo_st { |
| // int bar; |
| // } FOO; |
| // |
| // DEFINE_STACK_OF(FOO) |
| // |
| // Although note that the stack will contain /pointers/ to |FOO|. |
| // |
| // A macro will be defined for each of the sk_* functions below. For |
| // STACK_OF(FOO), the macros would be sk_FOO_new, sk_FOO_pop etc. |
| |
| |
| // stack_free_func is a function that frees an element in a stack. Note its |
| // actual type is void (*)(T *) for some T. Low-level |sk_*| functions will be |
| // passed a type-specific wrapper to call it correctly. |
| typedef void (*stack_free_func)(void *ptr); |
| |
| // stack_copy_func is a function that copies an element in a stack. Note its |
| // actual type is T *(*)(T *) for some T. Low-level |sk_*| functions will be |
| // passed a type-specific wrapper to call it correctly. |
| typedef void *(*stack_copy_func)(void *ptr); |
| |
| // stack_cmp_func is a comparison function that returns a value < 0, 0 or > 0 |
| // if |*a| is less than, equal to or greater than |*b|, respectively. Note the |
| // extra indirection - the function is given a pointer to a pointer to the |
| // element. This differs from the usual qsort/bsearch comparison function. |
| // |
| // Note its actual type is |int (*)(const T **a, const T **b)|. Low-level |sk_*| |
| // functions will be passed a type-specific wrapper to call it correctly. |
| // |
| // TODO(davidben): This type should be |const T *const *|. It is already fixed |
| // in OpenSSL 1.1.1, so hopefully we can fix this compatibly. |
| typedef int (*stack_cmp_func)(const void **a, const void **b); |
| |
| // The following function types call the above type-erased signatures with the |
| // true types. |
| typedef void (*stack_call_free_func)(stack_free_func, void *); |
| typedef void *(*stack_call_copy_func)(stack_copy_func, void *); |
| typedef int (*stack_call_cmp_func)(stack_cmp_func, const void *const *, |
| const void *const *); |
| |
| // stack_st contains an array of pointers. It is not designed to be used |
| // directly, rather the wrapper macros should be used. |
| typedef struct stack_st { |
| // num contains the number of valid pointers in |data|. |
| size_t num; |
| void **data; |
| // sorted is non-zero if the values pointed to by |data| are in ascending |
| // order, based on |comp|. |
| int sorted; |
| // num_alloc contains the number of pointers allocated in the buffer pointed |
| // to by |data|, which may be larger than |num|. |
| size_t num_alloc; |
| // comp is an optional comparison function. |
| stack_cmp_func comp; |
| } _STACK; |
| |
| |
| #define STACK_OF(type) struct stack_st_##type |
| |
| #define DECLARE_STACK_OF(type) STACK_OF(type); |
| |
| // These are the raw stack functions, you shouldn't be using them. Rather you |
| // should be using the type stack macros implemented above. |
| |
| // sk_new creates a new, empty stack with the given comparison function, which |
| // may be zero. It returns the new stack or NULL on allocation failure. |
| OPENSSL_EXPORT _STACK *sk_new(stack_cmp_func comp); |
| |
| // sk_new_null creates a new, empty stack. It returns the new stack or NULL on |
| // allocation failure. |
| OPENSSL_EXPORT _STACK *sk_new_null(void); |
| |
| // sk_num returns the number of elements in |s|. |
| OPENSSL_EXPORT size_t sk_num(const _STACK *sk); |
| |
| // sk_zero resets |sk| to the empty state but does nothing to free the |
| // individual elements themselves. |
| OPENSSL_EXPORT void sk_zero(_STACK *sk); |
| |
| // sk_value returns the |i|th pointer in |sk|, or NULL if |i| is out of |
| // range. |
| OPENSSL_EXPORT void *sk_value(const _STACK *sk, size_t i); |
| |
| // sk_set sets the |i|th pointer in |sk| to |p| and returns |p|. If |i| is out |
| // of range, it returns NULL. |
| OPENSSL_EXPORT void *sk_set(_STACK *sk, size_t i, void *p); |
| |
| // sk_free frees the given stack and array of pointers, but does nothing to |
| // free the individual elements. Also see |sk_pop_free_ex|. |
| OPENSSL_EXPORT void sk_free(_STACK *sk); |
| |
| // sk_pop_free_ex calls |free_func| on each element in the stack and then frees |
| // the stack itself. Note this corresponds to |sk_FOO_pop_free|. It is named |
| // |sk_pop_free_ex| as a workaround for existing code calling an older version |
| // of |sk_pop_free|. |
| OPENSSL_EXPORT void sk_pop_free_ex(_STACK *sk, |
| stack_call_free_func call_free_func, |
| stack_free_func free_func); |
| |
| // sk_insert inserts |p| into the stack at index |where|, moving existing |
| // elements if needed. It returns the length of the new stack, or zero on |
| // error. |
| OPENSSL_EXPORT size_t sk_insert(_STACK *sk, void *p, size_t where); |
| |
| // sk_delete removes the pointer at index |where|, moving other elements down |
| // if needed. It returns the removed pointer, or NULL if |where| is out of |
| // range. |
| OPENSSL_EXPORT void *sk_delete(_STACK *sk, size_t where); |
| |
| // sk_delete_ptr removes, at most, one instance of |p| from the stack based on |
| // pointer equality. If an instance of |p| is found then |p| is returned, |
| // otherwise it returns NULL. |
| OPENSSL_EXPORT void *sk_delete_ptr(_STACK *sk, const void *p); |
| |
| // sk_find returns the first value in the stack equal to |p|. If a comparison |
| // function has been set on the stack, equality is defined by it, otherwise |
| // pointer equality is used. If the stack is sorted, then a binary search is |
| // used, otherwise a linear search is performed. If a matching element is found, |
| // its index is written to |
| // |*out_index| (if |out_index| is not NULL) and one is returned. Otherwise zero |
| // is returned. |
| // |
| // Note this differs from OpenSSL. The type signature is slightly different, and |
| // OpenSSL's sk_find will implicitly sort |sk| if it has a comparison function |
| // defined. |
| OPENSSL_EXPORT int sk_find(const _STACK *sk, size_t *out_index, const void *p, |
| stack_call_cmp_func call_cmp_func); |
| |
| // sk_shift removes and returns the first element in the stack, or returns NULL |
| // if the stack is empty. |
| OPENSSL_EXPORT void *sk_shift(_STACK *sk); |
| |
| // sk_push appends |p| to the stack and returns the length of the new stack, or |
| // 0 on allocation failure. |
| OPENSSL_EXPORT size_t sk_push(_STACK *sk, void *p); |
| |
| // sk_pop returns and removes the last element on the stack, or NULL if the |
| // stack is empty. |
| OPENSSL_EXPORT void *sk_pop(_STACK *sk); |
| |
| // sk_dup performs a shallow copy of a stack and returns the new stack, or NULL |
| // on error. |
| OPENSSL_EXPORT _STACK *sk_dup(const _STACK *sk); |
| |
| // sk_sort sorts the elements of |sk| into ascending order based on the |
| // comparison function. The stack maintains a |sorted| flag and sorting an |
| // already sorted stack is a no-op. |
| OPENSSL_EXPORT void sk_sort(_STACK *sk, stack_call_cmp_func call_cmp_func); |
| |
| // sk_is_sorted returns one if |sk| is known to be sorted and zero |
| // otherwise. |
| OPENSSL_EXPORT int sk_is_sorted(const _STACK *sk); |
| |
| // sk_set_cmp_func sets the comparison function to be used by |sk| and returns |
| // the previous one. |
| OPENSSL_EXPORT stack_cmp_func sk_set_cmp_func(_STACK *sk, stack_cmp_func comp); |
| |
| // sk_deep_copy performs a copy of |sk| and of each of the non-NULL elements in |
| // |sk| by using |copy_func|. If an error occurs, |free_func| is used to free |
| // any copies already made and NULL is returned. |
| OPENSSL_EXPORT _STACK *sk_deep_copy(const _STACK *sk, |
| stack_call_copy_func call_copy_func, |
| stack_copy_func copy_func, |
| stack_call_free_func call_free_func, |
| stack_free_func free_func); |
| |
| |
| // Deprecated functions. |
| |
| // sk_pop_free behaves like |sk_pop_free_ex| but performs an invalid function |
| // pointer cast. It exists because some existing callers called |sk_pop_free| |
| // directly. |
| // |
| // TODO(davidben): Migrate callers to bssl::UniquePtr and remove this. |
| OPENSSL_EXPORT void sk_pop_free(_STACK *sk, stack_free_func free_func); |
| |
| |
| // Defining stack types. |
| // |
| // This set of macros is used to emit the typed functions that act on a |
| // |STACK_OF(T)|. |
| |
| #if !defined(BORINGSSL_NO_CXX) |
| extern "C++" { |
| BSSL_NAMESPACE_BEGIN |
| namespace internal { |
| template <typename T> |
| struct StackTraits {}; |
| } |
| BSSL_NAMESPACE_END |
| } |
| |
| #define BORINGSSL_DEFINE_STACK_TRAITS(name, type, is_const) \ |
| extern "C++" { \ |
| BSSL_NAMESPACE_BEGIN \ |
| namespace internal { \ |
| template <> \ |
| struct StackTraits<STACK_OF(name)> { \ |
| static constexpr bool kIsStack = true; \ |
| using Type = type; \ |
| static constexpr bool kIsConst = is_const; \ |
| }; \ |
| } \ |
| BSSL_NAMESPACE_END \ |
| } |
| |
| #else |
| #define BORINGSSL_DEFINE_STACK_TRAITS(name, type, is_const) |
| #endif |
| |
| #define BORINGSSL_DEFINE_STACK_OF_IMPL(name, ptrtype, constptrtype) \ |
| /* We disable MSVC C4191 in this macro, which warns when pointers are cast \ |
| * to the wrong type. While the cast itself is valid, it is often a bug \ |
| * because calling it through the cast is UB. However, we never actually \ |
| * call functions as |stack_cmp_func|. The type is just a type-erased \ |
| * function pointer. (C does not guarantee function pointers fit in \ |
| * |void*|, and GCC will warn on this.) Thus we just disable the false \ |
| * positive warning. */ \ |
| OPENSSL_MSVC_PRAGMA(warning(push)) \ |
| OPENSSL_MSVC_PRAGMA(warning(disable : 4191)) \ |
| \ |
| DECLARE_STACK_OF(name) \ |
| \ |
| typedef void (*stack_##name##_free_func)(ptrtype); \ |
| typedef ptrtype (*stack_##name##_copy_func)(ptrtype); \ |
| typedef int (*stack_##name##_cmp_func)(constptrtype *a, constptrtype *b); \ |
| \ |
| OPENSSL_INLINE void sk_##name##_call_free_func(stack_free_func free_func, \ |
| void *ptr) { \ |
| ((stack_##name##_free_func)free_func)((ptrtype)ptr); \ |
| } \ |
| \ |
| OPENSSL_INLINE void *sk_##name##_call_copy_func(stack_copy_func copy_func, \ |
| void *ptr) { \ |
| return (void *)((stack_##name##_copy_func)copy_func)((ptrtype)ptr); \ |
| } \ |
| \ |
| OPENSSL_INLINE int sk_##name##_call_cmp_func( \ |
| stack_cmp_func cmp_func, const void *const *a, const void *const *b) { \ |
| /* The data is actually stored as |void*| pointers, so read the pointer \ |
| * as |void*| and then pass the corrected type into the caller-supplied \ |
| * function, which expects |constptrtype*|. */ \ |
| constptrtype a_ptr = (constptrtype)*a; \ |
| constptrtype b_ptr = (constptrtype)*b; \ |
| return ((stack_##name##_cmp_func)cmp_func)(&a_ptr, &b_ptr); \ |
| } \ |
| \ |
| OPENSSL_INLINE STACK_OF(name) *sk_##name##_new( \ |
| stack_##name##_cmp_func comp) { \ |
| return (STACK_OF(name) *)sk_new((stack_cmp_func)comp); \ |
| } \ |
| \ |
| OPENSSL_INLINE STACK_OF(name) *sk_##name##_new_null(void) { \ |
| return (STACK_OF(name) *)sk_new_null(); \ |
| } \ |
| \ |
| OPENSSL_INLINE size_t sk_##name##_num(const STACK_OF(name) *sk) { \ |
| return sk_num((const _STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE void sk_##name##_zero(STACK_OF(name) *sk) { \ |
| sk_zero((_STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE ptrtype sk_##name##_value(const STACK_OF(name) *sk, \ |
| size_t i) { \ |
| return (ptrtype)sk_value((const _STACK *)sk, i); \ |
| } \ |
| \ |
| OPENSSL_INLINE ptrtype sk_##name##_set(STACK_OF(name) *sk, size_t i, \ |
| ptrtype p) { \ |
| return (ptrtype)sk_set((_STACK *)sk, i, (void *)p); \ |
| } \ |
| \ |
| OPENSSL_INLINE void sk_##name##_free(STACK_OF(name) *sk) { \ |
| sk_free((_STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE void sk_##name##_pop_free( \ |
| STACK_OF(name) *sk, stack_##name##_free_func free_func) { \ |
| sk_pop_free_ex((_STACK *)sk, sk_##name##_call_free_func, \ |
| (stack_free_func)free_func); \ |
| } \ |
| \ |
| OPENSSL_INLINE size_t sk_##name##_insert(STACK_OF(name) *sk, ptrtype p, \ |
| size_t where) { \ |
| return sk_insert((_STACK *)sk, (void *)p, where); \ |
| } \ |
| \ |
| OPENSSL_INLINE ptrtype sk_##name##_delete(STACK_OF(name) *sk, \ |
| size_t where) { \ |
| return (ptrtype)sk_delete((_STACK *)sk, where); \ |
| } \ |
| \ |
| OPENSSL_INLINE ptrtype sk_##name##_delete_ptr(STACK_OF(name) *sk, \ |
| constptrtype p) { \ |
| return (ptrtype)sk_delete_ptr((_STACK *)sk, (const void *)p); \ |
| } \ |
| \ |
| OPENSSL_INLINE int sk_##name##_find(const STACK_OF(name) *sk, \ |
| size_t *out_index, constptrtype p) { \ |
| return sk_find((const _STACK *)sk, out_index, (const void *)p, \ |
| sk_##name##_call_cmp_func); \ |
| } \ |
| \ |
| OPENSSL_INLINE ptrtype sk_##name##_shift(STACK_OF(name) *sk) { \ |
| return (ptrtype)sk_shift((_STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE size_t sk_##name##_push(STACK_OF(name) *sk, ptrtype p) { \ |
| return sk_push((_STACK *)sk, (void *)p); \ |
| } \ |
| \ |
| OPENSSL_INLINE ptrtype sk_##name##_pop(STACK_OF(name) *sk) { \ |
| return (ptrtype)sk_pop((_STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE STACK_OF(name) *sk_##name##_dup(const STACK_OF(name) *sk) { \ |
| return (STACK_OF(name) *)sk_dup((const _STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE void sk_##name##_sort(STACK_OF(name) *sk) { \ |
| sk_sort((_STACK *)sk, sk_##name##_call_cmp_func); \ |
| } \ |
| \ |
| OPENSSL_INLINE int sk_##name##_is_sorted(const STACK_OF(name) *sk) { \ |
| return sk_is_sorted((const _STACK *)sk); \ |
| } \ |
| \ |
| OPENSSL_INLINE stack_##name##_cmp_func sk_##name##_set_cmp_func( \ |
| STACK_OF(name) *sk, stack_##name##_cmp_func comp) { \ |
| return (stack_##name##_cmp_func)sk_set_cmp_func((_STACK *)sk, \ |
| (stack_cmp_func)comp); \ |
| } \ |
| \ |
| OPENSSL_INLINE STACK_OF(name) *sk_##name##_deep_copy( \ |
| const STACK_OF(name) *sk, ptrtype (*copy_func)(ptrtype), \ |
| void (*free_func)(ptrtype)) { \ |
| return (STACK_OF(name) *)sk_deep_copy( \ |
| (const _STACK *)sk, sk_##name##_call_copy_func, \ |
| (stack_copy_func)copy_func, sk_##name##_call_free_func, \ |
| (stack_free_func)free_func); \ |
| } \ |
| \ |
| OPENSSL_MSVC_PRAGMA(warning(pop)) |
| |
| // DEFINE_NAMED_STACK_OF defines |STACK_OF(name)| to be a stack whose elements |
| // are |type| *. |
| #define DEFINE_NAMED_STACK_OF(name, type) \ |
| BORINGSSL_DEFINE_STACK_OF_IMPL(name, type *, const type *) \ |
| BORINGSSL_DEFINE_STACK_TRAITS(name, type, false) |
| |
| // DEFINE_STACK_OF defines |STACK_OF(type)| to be a stack whose elements are |
| // |type| *. |
| #define DEFINE_STACK_OF(type) DEFINE_NAMED_STACK_OF(type, type) |
| |
| // DEFINE_CONST_STACK_OF defines |STACK_OF(type)| to be a stack whose elements |
| // are const |type| *. |
| #define DEFINE_CONST_STACK_OF(type) \ |
| BORINGSSL_DEFINE_STACK_OF_IMPL(type, const type *, const type *) \ |
| BORINGSSL_DEFINE_STACK_TRAITS(type, const type, true) |
| |
| // DEFINE_SPECIAL_STACK_OF defines |STACK_OF(type)| to be a stack whose elements |
| // are |type|, where |type| must be a typedef for a pointer. |
| #define DEFINE_SPECIAL_STACK_OF(type) \ |
| OPENSSL_STATIC_ASSERT(sizeof(type) == sizeof(void *), \ |
| #type " is not a pointer"); \ |
| BORINGSSL_DEFINE_STACK_OF_IMPL(type, type, const type) |
| |
| |
| typedef char *OPENSSL_STRING; |
| |
| DEFINE_STACK_OF(void) |
| DEFINE_SPECIAL_STACK_OF(OPENSSL_STRING) |
| |
| |
| #if defined(__cplusplus) |
| } // extern C |
| #endif |
| |
| #if !defined(BORINGSSL_NO_CXX) |
| extern "C++" { |
| |
| #include <type_traits> |
| |
| BSSL_NAMESPACE_BEGIN |
| |
| namespace internal { |
| |
| // Stacks defined with |DEFINE_CONST_STACK_OF| are freed with |sk_free|. |
| template <typename Stack> |
| struct DeleterImpl<Stack, std::enable_if_t<StackTraits<Stack>::kIsConst>> { |
| static void Free(Stack *sk) { sk_free(reinterpret_cast<_STACK *>(sk)); } |
| }; |
| |
| // Stacks defined with |DEFINE_STACK_OF| are freed with |sk_pop_free| and the |
| // corresponding type's deleter. |
| template <typename Stack> |
| struct DeleterImpl<Stack, std::enable_if_t<!StackTraits<Stack>::kIsConst>> { |
| static void Free(Stack *sk) { |
| // sk_FOO_pop_free is defined by macros and bound by name, so we cannot |
| // access it from C++ here. |
| using Type = typename StackTraits<Stack>::Type; |
| sk_pop_free_ex(reinterpret_cast<_STACK *>(sk), |
| [](stack_free_func /* unused */, void *ptr) { |
| DeleterImpl<Type>::Free(reinterpret_cast<Type *>(ptr)); |
| }, |
| nullptr); |
| } |
| }; |
| |
| template <typename Stack> |
| class StackIteratorImpl { |
| public: |
| using Type = typename StackTraits<Stack>::Type; |
| // Iterators must be default-constructable. |
| StackIteratorImpl() : sk_(nullptr), idx_(0) {} |
| StackIteratorImpl(const Stack *sk, size_t idx) : sk_(sk), idx_(idx) {} |
| |
| bool operator==(StackIteratorImpl other) const { |
| return sk_ == other.sk_ && idx_ == other.idx_; |
| } |
| bool operator!=(StackIteratorImpl other) const { |
| return !(*this == other); |
| } |
| |
| Type *operator*() const { |
| return reinterpret_cast<Type *>( |
| sk_value(reinterpret_cast<const _STACK *>(sk_), idx_)); |
| } |
| |
| StackIteratorImpl &operator++(/* prefix */) { |
| idx_++; |
| return *this; |
| } |
| |
| StackIteratorImpl operator++(int /* postfix */) { |
| StackIteratorImpl copy(*this); |
| ++(*this); |
| return copy; |
| } |
| |
| private: |
| const Stack *sk_; |
| size_t idx_; |
| }; |
| |
| template <typename Stack> |
| using StackIterator = |
| std::enable_if_t<StackTraits<Stack>::kIsStack, StackIteratorImpl<Stack>>; |
| |
| } // namespace internal |
| |
| // PushToStack pushes |elem| to |sk|. It returns true on success and false on |
| // allocation failure. |
| template <typename Stack> |
| inline std::enable_if_t<!internal::StackTraits<Stack>::kIsConst, bool> |
| PushToStack(Stack *sk, |
| UniquePtr<typename internal::StackTraits<Stack>::Type> elem) { |
| if (!sk_push(reinterpret_cast<_STACK *>(sk), elem.get())) { |
| return false; |
| } |
| // sk_push takes ownership on success. |
| elem.release(); |
| return true; |
| } |
| |
| BSSL_NAMESPACE_END |
| |
| // Define begin() and end() for stack types so C++ range for loops work. |
| template <typename Stack> |
| inline bssl::internal::StackIterator<Stack> begin(const Stack *sk) { |
| return bssl::internal::StackIterator<Stack>(sk, 0); |
| } |
| |
| template <typename Stack> |
| inline bssl::internal::StackIterator<Stack> end(const Stack *sk) { |
| return bssl::internal::StackIterator<Stack>( |
| sk, sk_num(reinterpret_cast<const _STACK *>(sk))); |
| } |
| |
| } // extern C++ |
| #endif |
| |
| #endif // OPENSSL_HEADER_STACK_H |
