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buffer_view.hpp
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buffer_view.hpp
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/**
* Copyright Quadrivium LLC
* All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <qtils/cxx20/lexicographical_compare_three_way.hpp>
#include <ranges>
#include <span>
#include "common/hexutil.hpp"
#include "macro/endianness_utils.hpp"
inline auto operator""_bytes(const char *s, std::size_t size) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
return std::span<const uint8_t>(reinterpret_cast<const uint8_t *>(s), size);
}
namespace kagome::common {
template <size_t MaxSize, typename Allocator>
class SLBuffer;
}
namespace kagome::common {
class BufferView : public std::span<const uint8_t> {
public:
using span::span;
BufferView(std::initializer_list<uint8_t> &&) = delete;
BufferView(const span &other) : span(other) {}
template <typename T>
requires std::is_integral_v<std::decay_t<T>> and (sizeof(T) == 1)
BufferView(std::span<T> other)
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
: span(reinterpret_cast<const uint8_t *>(other.data()), other.size()) {}
template <typename T>
BufferView &operator=(T &&value) {
span::operator=(std::forward<T>(value));
return *this;
}
template <size_t count>
void dropFirst() {
*this = subspan<count>();
}
void dropFirst(size_t count) {
*this = subspan(count);
}
template <size_t count>
void dropLast() {
*this = first(size() - count);
}
void dropLast(size_t count) {
*this = first(size() - count);
}
std::string toHex() const {
return hex_lower(*this);
}
std::string_view toStringView() const {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
return {reinterpret_cast<const char *>(data()), size()};
}
auto operator<=>(const BufferView &other) const {
return qtils::cxx20::lexicographical_compare_three_way(
span::begin(), span::end(), other.begin(), other.end());
}
auto operator==(const BufferView &other) const {
return (*this <=> other) == std::strong_ordering::equal;
}
};
inline std::ostream &operator<<(std::ostream &os, BufferView view) {
return os << view.toHex();
}
template <typename Super, typename Prefix>
bool startsWith(const Super &super, const Prefix &prefix) {
if (std::size(super) >= std::size(prefix)) {
return std::equal(
std::begin(prefix), std::end(prefix), std::begin(super));
}
return false;
}
} // namespace kagome::common
namespace kagome {
using common::BufferView;
} // namespace kagome
template <>
struct fmt::formatter<kagome::common::BufferView> {
// Presentation format: 's' - short, 'l' - long.
char presentation = 's';
// Parses format specifications of the form ['s' | 'l'].
constexpr auto parse(format_parse_context &ctx) -> decltype(ctx.begin()) {
// Parse the presentation format and store it in the formatter:
auto it = ctx.begin();
auto end = ctx.end();
if (it != end && (*it == 's' || *it == 'l')) {
presentation = *it++;
}
// Check if reached the end of the range:
if (it != end && *it != '}') {
throw format_error("invalid format");
}
// Return an iterator past the end of the parsed range:
return it;
}
// Formats the Blob using the parsed format specification (presentation)
// stored in this formatter.
template <typename FormatContext>
auto format(const kagome::common::BufferView &view, FormatContext &ctx) const
-> decltype(ctx.out()) {
// ctx.out() is an output iterator to write to.
if (view.empty()) {
static constexpr string_view message("<empty>");
return std::copy(message.begin(), message.end(), ctx.out());
}
if (presentation == 's' && view.size() > 5) {
return fmt::format_to(
ctx.out(),
"0x{:04x}…{:04x}",
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
htobe16(*reinterpret_cast<const uint16_t *>(view.data())),
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
htobe16(*reinterpret_cast<const uint16_t *>(view.data() + view.size()
- sizeof(uint16_t))));
}
return fmt::format_to(ctx.out(), "0x{}", view.toHex());
}
};