diff options
Diffstat (limited to 'contrib/epee')
| -rw-r--r-- | contrib/epee/include/hex.h | 27 | ||||
| -rw-r--r-- | contrib/epee/include/span.h | 130 | ||||
| -rw-r--r-- | contrib/epee/include/span_view.h | 174 | ||||
| -rw-r--r-- | contrib/epee/src/hex.cpp | 10 |
4 files changed, 142 insertions, 199 deletions
diff --git a/contrib/epee/include/hex.h b/contrib/epee/include/hex.h index 99a86503a..f8d6be048 100644 --- a/contrib/epee/include/hex.h +++ b/contrib/epee/include/hex.h @@ -33,46 +33,33 @@ #include <iosfwd> #include <string> -#include "span_view.h" +#include "span.h" namespace epee { struct to_hex { //! \return A std::string containing hex of `src`. - static std::string string(const view<std::uint8_t> src); - - //! \return A std::string containing hex of `src`. - static std::string string(const view<char> src) { - return string(view_cast<std::uint8_t>(src)); - } + static std::string string(const span<const std::uint8_t> src); //! \return An array containing hex of `src`. template<std::size_t N> - static std::array<char, N * 2> - array(const std::array<std::uint8_t, N>& src) noexcept(noexcept(view<std::uint8_t>(src))) + static std::array<char, N * 2> array(const std::array<std::uint8_t, N>& src) noexcept { std::array<char, N * 2> out{{}}; static_assert(N <= 128, "keep the stack size down"); - buffer_unchecked(out.data(), src); + buffer_unchecked(out.data(), {src.data(), src.size()}); return out; } //! Append `src` as hex to `out`. - static void buffer(std::ostream& out, const view<std::uint8_t> src); + static void buffer(std::ostream& out, const span<const std::uint8_t> src); //! Append `< + src + >` as hex to `out`. - static void formatted(std::ostream& out, const view<std::uint8_t> src); - - //! Append `< + src + >` as hex to `out`. - template<typename T> - static void formatted_from_pod(std::ostream& out, const T& pod) - { - formatted(out, pod_cast<const std::uint8_t>(pod)); - } + static void formatted(std::ostream& out, const span<const std::uint8_t> src); private: //! Write `src` bytes as hex to `out`. `out` must be twice the length - static void buffer_unchecked(char* out, const view<std::uint8_t> src) noexcept; + static void buffer_unchecked(char* out, const span<const std::uint8_t> src) noexcept; }; } diff --git a/contrib/epee/include/span.h b/contrib/epee/include/span.h new file mode 100644 index 000000000..ea4ba63dd --- /dev/null +++ b/contrib/epee/include/span.h @@ -0,0 +1,130 @@ +// Copyright (c) 2017, The Monero Project +// +// All rights reserved. +// +// 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 above 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. Neither the name of the copyright holder nor the names of its contributors may be +// used to endorse or promote products derived from this software without specific +// prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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. + +#pragma once + +#include <cstdint> +#include <memory> +#include <type_traits> + +namespace epee +{ + /*! + \brief Non-owning sequence of data. Does not deep copy + + Inspired by `gsl::span` and/or `boost::iterator_range`. This class is + intended to be used as a parameter type for functions that need to take a + writable or read-only sequence of data. Most common cases are `span<char>` + and `span<std::uint8_t>`. Using as a class member is only recommended if + clearly documented as not doing a deep-copy. C-arrays are easily convertible + to this type. + + \note Conversion from C string literal to `span<const char>` will include + the NULL-terminator. + \note Never allows derived-to-base pointer conversion; an array of derived + types is not an array of base types. + */ + template<typename T> + class span + { + /* Supporting class types is tricky - the {ptr,len} constructor will allow + derived-to-base conversions. This is NOT desireable because an array of + derived types is not an array of base types. It is possible to handle + this case, implement when/if needed. */ + static_assert(!std::is_class<T>(), "no class types are currently allowed"); + public: + using value_type = T; + using size_type = std::size_t; + using difference_type = std::ptrdiff_t; + using pointer = T*; + using const_pointer = const T*; + using reference = T&; + using const_reference = const T&; + using iterator = pointer; + using const_iterator = const_pointer; + + constexpr span() noexcept : ptr(nullptr), len(0) {} + constexpr span(std::nullptr_t) noexcept : span() {} + + constexpr span(T* const src_ptr, const std::size_t count) noexcept + : ptr(src_ptr), len(count) {} + + //! Conversion from C-array. Prevents common bugs with sizeof + arrays. + template<std::size_t N> + constexpr span(T (&src)[N]) noexcept : span(src, N) {} + + constexpr span(const span&) noexcept = default; + span& operator=(const span&) noexcept = default; + + constexpr iterator begin() const noexcept { return ptr; } + constexpr const_iterator cbegin() const noexcept { return ptr; } + + constexpr iterator end() const noexcept { return begin() + size(); } + constexpr const_iterator cend() const noexcept { return cbegin() + size(); } + + constexpr bool empty() const noexcept { return size() == 0; } + constexpr pointer data() const noexcept { return ptr; } + constexpr std::size_t size() const noexcept { return len; } + constexpr std::size_t size_bytes() const noexcept { return size() * sizeof(value_type); } + + private: + T* ptr; + std::size_t len; + }; + + //! \return `span<const T::value_type>` from a STL compatible `src`. + template<typename T> + constexpr span<const typename T::value_type> to_span(const T& src) + { + // compiler provides diagnostic if size() is not size_t. + return {src.data(), src.size()}; + } + + template<typename T> + constexpr bool has_padding() noexcept + { + return !std::is_pod<T>() || alignof(T) != 1; + } + + //! \return Cast data from `src` as `span<const std::uint8_t>`. + template<typename T> + span<const std::uint8_t> to_byte_span(const span<const T> src) noexcept + { + static_assert(!has_padding<T>(), "source type may have padding"); + return {reinterpret_cast<const std::uint8_t*>(src.data()), src.size_bytes()}; + } + + //! \return `span<const std::uint8_t>` which represents the bytes at `&src`. + template<typename T> + span<const std::uint8_t> as_byte_span(const T& src) noexcept + { + static_assert(!std::is_empty<T>(), "empty types will not work -> sizeof == 1"); + static_assert(!has_padding<T>(), "source type may have padding"); + return {reinterpret_cast<const std::uint8_t*>(std::addressof(src)), sizeof(T)}; + } +} diff --git a/contrib/epee/include/span_view.h b/contrib/epee/include/span_view.h deleted file mode 100644 index 33c538d37..000000000 --- a/contrib/epee/include/span_view.h +++ /dev/null @@ -1,174 +0,0 @@ -// Copyright (c) 2017, The Monero Project -// -// All rights reserved. -// -// 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 above 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. Neither the name of the copyright holder nor the names of its contributors may be -// used to endorse or promote products derived from this software without specific -// prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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. - -#pragma once - -#include <cstddef> -#include <memory> -#include <type_traits> -#include <utility> - -namespace epee -{ - /*! - \brief Non-owning sequence of data. Does not deep copy - - Inspired by `gsl::span`. This class is intended to be used as a parameter - type for functions that need to take a writable or read-only sequence of - data. Most common cases are `span<char>` and `span<std::uint8_t>`. Using as - a class member is only recommended if clearly documented as not doing a - deep-copy. `std::vector`, `std::string`, `std::array`, and C-arrays are all - easily convertible to this type. - - \note Conversion from C string literal to `view<char>` will include the - NULL-terminator. - \note `view<T>` is an alias for `span<const T>` which is read-only. - \note Never allows derived-to-base pointer conversion; an array of derived - types is not an array of base types. - */ - template<typename T> - class span - { - /* Supporting class types is tricky - the {ptr,len} and {container} - constructors will allow derived-to-base conversions. This is NOT - desireable because an array of derived types is not an array of base - types. It is possible to handle this case, implement when/if needed. */ - static_assert(std::is_integral<T>::value, "only integral values currently for span"); - - // Disables ADL for these calls. - struct get { - // we only accept pointer and size_t return types, so use noexcept aggressively - template<std::size_t N> - static constexpr T* data(T (&src)[N]) noexcept { return src; } - - template<typename C> - static constexpr auto - data(C& src) noexcept(noexcept(src.data())) -> decltype(src.data()) { - return src.data(); - } - - - template<std::size_t N> - static constexpr std::size_t size(T (&)[N]) noexcept { return N; } - - template<typename C> - static constexpr auto - size(const C& src) noexcept(noexcept(src.size())) -> decltype(src.size()) { - return src.size(); - } - }; - - public: - using value_type = T; - using pointer = T*; - using reference = T&; - using iterator = pointer; - using const_iterator = typename std::add_const<value_type>::type *; - - constexpr span() noexcept : ptr(nullptr), len(0) {} - constexpr span(std::nullptr_t) noexcept : span() {} - - constexpr span(T* const src_ptr, const std::size_t src_len) noexcept - : ptr(src_ptr), len(src_len) { - } - - /*! - A `span` is implicitly convertible from any type where `get::data(src)` - returns a pointer convertible to T* and `get::size(src)` returns a - `std::size_t`. This constructor is disabled for all other types. - */ - template< - typename C, - typename U = decltype(get::data(std::declval<C&>())), - typename S = decltype(get::size(std::declval<C&>())), - typename = typename std::enable_if< - // Do not allow proxy iterators, but allow valid cv conversions - std::is_pointer<U>::value && std::is_convertible<U, pointer>::value && - // Prevent underflow/overflow on size storage - std::is_same<S, std::size_t>::value - >::type - > - constexpr span(C&& src) noexcept(noexcept(get::data(src), get::size(src))) - : span(get::data(src), get::size(src)) { - } - - constexpr span(span&&) noexcept = default; - constexpr span(span&) noexcept = default; - constexpr span(const span&) noexcept = default; - span& operator=(const span&) noexcept = default; - - constexpr iterator begin() const noexcept { return ptr; } - constexpr const_iterator cbegin() const noexcept { return ptr; } - - constexpr iterator end() const noexcept { return begin() + size(); } - constexpr const_iterator cend() const noexcept { return cbegin() + size(); } - - constexpr bool empty() const noexcept { return size() == 0; } - constexpr pointer data() const noexcept { return ptr; } - constexpr std::size_t size() const noexcept { return len; } - constexpr std::size_t size_bytes() const noexcept { return size() * sizeof(value_type); } - - private: - T* ptr; - std::size_t len; - }; - - //! A `view` is a `span` over immutable data. See `span` for more info. - template<typename T> - using view = span<typename std::add_const<T>::type>; - - //! \return `src` aliased as a view of type `T`. - template<typename T, typename U> - view<T> view_cast(const span<U>& src) noexcept - { - using normalized = typename std::remove_cv<T>::type; - static_assert( - std::is_same<normalized, char>::value || std::is_same<normalized, std::uint8_t>::value, - "only valid aliasing allowed - char or unsigned char target types" - ); - - static_assert(std::is_integral<U>::value, "only integral source types"); - return {reinterpret_cast<typename std::add_const<T>::type *>(src.data()), src.size_bytes()}; - } - - //! \return `src` aliased as a span of type `T`. - template<typename T, typename U> - span<T> pod_cast(U&& src) noexcept - { - using normalized = typename std::remove_cv<T>::type; - static_assert( - std::is_same<normalized, char>::value || std::is_same<normalized, std::uint8_t>::value, - "only valid aliasing allowed - char or unsigned char target types" - ); - - using decayed = typename std::decay<U>::type; - static_assert(std::is_pod<decayed>::value, "only POD types allowed for conversion"); - static_assert(alignof(decayed) == 1, "only types with 1 byte alignment allowed for conversion"); - return {reinterpret_cast<T*>(std::addressof(src)), sizeof(decayed)}; - } -} diff --git a/contrib/epee/src/hex.cpp b/contrib/epee/src/hex.cpp index 6a698b5a9..cfbd3cf87 100644 --- a/contrib/epee/src/hex.cpp +++ b/contrib/epee/src/hex.cpp @@ -38,7 +38,7 @@ namespace epee namespace { template<typename T> - void write_hex(T&& out, const view<std::uint8_t> src) + void write_hex(T&& out, const span<const std::uint8_t> src) { static constexpr const char hex[] = u8"0123456789abcdef"; static_assert(sizeof(hex) == 17, "bad string size"); @@ -52,7 +52,7 @@ namespace epee } } - std::string to_hex::string(const view<std::uint8_t> src) + std::string to_hex::string(const span<const std::uint8_t> src) { if (std::numeric_limits<std::size_t>::max() / 2 < src.size()) throw std::range_error("hex_view::to_string exceeded maximum size"); @@ -63,19 +63,19 @@ namespace epee return out; } - void to_hex::buffer(std::ostream& out, const view<std::uint8_t> src) + void to_hex::buffer(std::ostream& out, const span<const std::uint8_t> src) { write_hex(std::ostreambuf_iterator<char>{out}, src); } - void to_hex::formatted(std::ostream& out, const view<std::uint8_t> src) + void to_hex::formatted(std::ostream& out, const span<const std::uint8_t> src) { out.put('<'); buffer(out, src); out.put('>'); } - void to_hex::buffer_unchecked(char* out, const view<std::uint8_t> src) noexcept + void to_hex::buffer_unchecked(char* out, const span<const std::uint8_t> src) noexcept { return write_hex(out, src); } |