external/boringssl: Sync to 9bbdf5832de8a2d395303c669b594fc61c791f4d.
This includes the following changes:
https://boringssl.googlesource.com/boringssl/+log/c642aca28feb7e18f244658559f4042286aed0c8..9bbdf5832de8a2d395303c669b594fc61c791f4d
Test: BoringSSL CTS Presubmits.
Change-Id: Ieb6fcfee99c4cc496b2f6e1d3e6597784bd80189
diff --git a/src/include/openssl/span.h b/src/include/openssl/span.h
new file mode 100644
index 0000000..4c09159
--- /dev/null
+++ b/src/include/openssl/span.h
@@ -0,0 +1,163 @@
+/* Copyright (c) 2017, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_SSL_SPAN_H
+#define OPENSSL_HEADER_SSL_SPAN_H
+
+#include <openssl/base.h>
+
+#if !defined(BORINGSSL_NO_CXX)
+
+extern "C++" {
+
+#include <algorithm>
+#include <type_traits>
+
+namespace bssl {
+
+template <typename T>
+class Span;
+
+namespace internal {
+template <typename T>
+class SpanBase {
+ /* Put comparison operator implementations into a base class with const T, so
+ * they can be used with any type that implicitly converts into a Span. */
+ static_assert(std::is_const<T>::value,
+ "Span<T> must be derived from SpanBase<const T>");
+
+ friend bool operator==(Span<T> lhs, Span<T> rhs) {
+ /* MSVC issues warning C4996 because std::equal is unsafe. The pragma to
+ * suppress the warning mysteriously has no effect, hence this
+ * implementation. See
+ * https://msdn.microsoft.com/en-us/library/aa985974.aspx. */
+ if (lhs.size() != rhs.size()) {
+ return false;
+ }
+ for (T *l = lhs.begin(), *r = rhs.begin(); l != lhs.end() && r != rhs.end();
+ ++l, ++r) {
+ if (*l != *r) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ friend bool operator!=(Span<T> lhs, Span<T> rhs) { return !(lhs == rhs); }
+};
+} // namespace internal
+
+/* A Span<T> is a non-owning reference to a contiguous array of objects of type
+ * |T|. Conceptually, a Span is a simple a pointer to |T| and a count of
+ * elements accessible via that pointer. The elements referenced by the Span can
+ * be mutated if |T| is mutable.
+ *
+ * A Span can be constructed from container types implementing |data()| and
+ * |size()| methods. If |T| is constant, construction from a container type is
+ * implicit. This allows writing methods that accept data from some unspecified
+ * container type:
+ *
+ * // Foo views data referenced by v.
+ * void Foo(bssl::Span<const uint8_t> v) { ... }
+ *
+ * std::vector<uint8_t> vec;
+ * Foo(vec);
+ *
+ * For mutable Spans, conversion is explicit:
+ *
+ * // FooMutate mutates data referenced by v.
+ * void FooMutate(bssl::Span<uint8_t> v) { ... }
+ *
+ * FooMutate(bssl::Span<uint8_t>(vec));
+ *
+ * You can also use the |MakeSpan| and |MakeConstSpan| factory methods to
+ * construct Spans in order to deduce the type of the Span automatically.
+ *
+ * FooMutate(bssl::MakeSpan(vec));
+ *
+ * Note that Spans have value type sematics. They are cheap to construct and
+ * copy, and should be passed by value whenever a method would otherwise accept
+ * a reference or pointer to a container or array. */
+template <typename T>
+class Span : private internal::SpanBase<const T> {
+ private:
+ template <bool B, class V = void>
+ using enable_if_t = typename std::enable_if<B, V>::type;
+
+ // Heuristically test whether C is a container type that can be converted into
+ // a Span by checking for data() and size() member functions.
+ template <typename C>
+ using EnableIfContainer = enable_if_t<
+ std::is_convertible<decltype(std::declval<C>().data()), T *>::value &&
+ std::is_integral<decltype(std::declval<C>().size())>::value>;
+
+ public:
+ constexpr Span() : Span(nullptr, 0) {}
+ constexpr Span(T *ptr, size_t len) : data_(ptr), size_(len) {}
+
+ template <size_t N>
+ constexpr Span(T (&array)[N]) : Span(array, N) {}
+
+ template <typename C, typename = EnableIfContainer<C>,
+ typename = enable_if_t<std::is_const<T>::value, C>>
+ Span(const C &container) : data_(container.data()), size_(container.size()) {}
+
+ template <typename C, typename = EnableIfContainer<C>,
+ typename = enable_if_t<!std::is_const<T>::value, C>>
+ explicit Span(C &container)
+ : data_(container.data()), size_(container.size()) {}
+
+ T *data() const { return data_; }
+ size_t size() const { return size_; }
+
+ T *begin() const { return data_; }
+ const T *cbegin() const { return data_; }
+ T *end() const { return data_ + size_; };
+ const T *cend() const { return end(); };
+
+ T &operator[](size_t i) const { return data_[i]; }
+ T &at(size_t i) const { return data_[i]; }
+
+ private:
+ T *data_;
+ size_t size_;
+};
+
+template <typename T>
+Span<T> MakeSpan(T *ptr, size_t size) {
+ return Span<T>(ptr, size);
+}
+
+template <typename C>
+auto MakeSpan(C &c) -> decltype(MakeSpan(c.data(), c.size())) {
+ return MakeSpan(c.data(), c.size());
+}
+
+template <typename T>
+Span<const T> MakeConstSpan(T *ptr, size_t size) {
+ return Span<const T>(ptr, size);
+}
+
+template <typename C>
+auto MakeConstSpan(const C &c) -> decltype(MakeConstSpan(c.data(), c.size())) {
+ return MakeConstSpan(c.data(), c.size());
+}
+
+} // namespace bssl
+
+} // extern C++
+
+#endif // !defined(BORINGSSL_NO_CXX)
+
+#endif /* OPENSSL_HEADER_SSL_SPAN_H */