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/*
* Copyright (c) 2020-2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Iterator.h>
#include <AK/TypedTransfer.h>
#include <AK/Types.h>
namespace AK {
namespace Detail {
template<typename T>
class Span {
public:
ALWAYS_INLINE constexpr Span() = default;
ALWAYS_INLINE constexpr Span(T* values, size_t size)
: m_values(values)
, m_size(size)
{
}
template<size_t size>
ALWAYS_INLINE constexpr Span(T (&values)[size])
: m_values(values)
, m_size(size)
{
}
protected:
T* m_values { nullptr };
size_t m_size { 0 };
};
template<>
class Span<u8> {
public:
ALWAYS_INLINE constexpr Span() = default;
ALWAYS_INLINE constexpr Span(u8* values, size_t size)
: m_values(values)
, m_size(size)
{
}
ALWAYS_INLINE Span(void* values, size_t size)
: m_values(reinterpret_cast<u8*>(values))
, m_size(size)
{
}
protected:
u8* m_values { nullptr };
size_t m_size { 0 };
};
template<>
class Span<const u8> {
public:
ALWAYS_INLINE constexpr Span() = default;
ALWAYS_INLINE constexpr Span(const u8* values, size_t size)
: m_values(values)
, m_size(size)
{
}
ALWAYS_INLINE Span(const void* values, size_t size)
: m_values(reinterpret_cast<const u8*>(values))
, m_size(size)
{
}
ALWAYS_INLINE Span(const char* values, size_t size)
: m_values(reinterpret_cast<const u8*>(values))
, m_size(size)
{
}
protected:
const u8* m_values { nullptr };
size_t m_size { 0 };
};
}
template<typename T>
class Span : public Detail::Span<T> {
public:
using Detail::Span<T>::Span;
constexpr Span() = default;
ALWAYS_INLINE constexpr Span(const Span& other)
: Span(other.m_values, other.m_size)
{
}
[[nodiscard]] ALWAYS_INLINE constexpr const T* data() const { return this->m_values; }
[[nodiscard]] ALWAYS_INLINE constexpr T* data() { return this->m_values; }
[[nodiscard]] ALWAYS_INLINE constexpr const T* offset_pointer(size_t offset) const { return this->m_values + offset; }
[[nodiscard]] ALWAYS_INLINE constexpr T* offset_pointer(size_t offset) { return this->m_values + offset; }
using ConstIterator = SimpleIterator<const Span, const T>;
using Iterator = SimpleIterator<Span, T>;
constexpr ConstIterator begin() const { return ConstIterator::begin(*this); }
constexpr Iterator begin() { return Iterator::begin(*this); }
constexpr ConstIterator end() const { return ConstIterator::end(*this); }
constexpr Iterator end() { return Iterator::end(*this); }
[[nodiscard]] ALWAYS_INLINE constexpr size_t size() const { return this->m_size; }
[[nodiscard]] ALWAYS_INLINE constexpr bool is_null() const { return this->m_values == nullptr; }
[[nodiscard]] ALWAYS_INLINE constexpr bool is_empty() const { return this->m_size == 0; }
[[nodiscard]] ALWAYS_INLINE constexpr Span slice(size_t start, size_t length) const
{
VERIFY(start + length <= size());
return { this->m_values + start, length };
}
[[nodiscard]] ALWAYS_INLINE constexpr Span slice(size_t start) const
{
VERIFY(start <= size());
return { this->m_values + start, size() - start };
}
[[nodiscard]] ALWAYS_INLINE constexpr Span slice_from_end(size_t count) const
{
VERIFY(count <= size());
return { this->m_values + size() - count, count };
}
[[nodiscard]] ALWAYS_INLINE constexpr Span trim(size_t length) const
{
return { this->m_values, min(size(), length) };
}
[[nodiscard]] ALWAYS_INLINE constexpr T* offset(size_t start) const
{
VERIFY(start < this->m_size);
return this->m_values + start;
}
ALWAYS_INLINE constexpr void overwrite(size_t offset, const void* data, size_t data_size)
{
// make sure we're not told to write past the end
VERIFY(offset + data_size <= size());
__builtin_memcpy(this->data() + offset, data, data_size);
}
ALWAYS_INLINE constexpr size_t copy_to(Span<RemoveConst<T>> other) const
{
VERIFY(other.size() >= size());
return TypedTransfer<RemoveConst<T>>::copy(other.data(), data(), size());
}
ALWAYS_INLINE constexpr size_t copy_trimmed_to(Span<RemoveConst<T>> other) const
{
const auto count = min(size(), other.size());
return TypedTransfer<RemoveConst<T>>::copy(other.data(), data(), count);
}
ALWAYS_INLINE constexpr size_t fill(const T& value)
{
for (size_t idx = 0; idx < size(); ++idx)
data()[idx] = value;
return size();
}
[[nodiscard]] bool constexpr contains_slow(const T& value) const
{
for (size_t i = 0; i < size(); ++i) {
if (at(i) == value)
return true;
}
return false;
}
[[nodiscard]] bool constexpr starts_with(Span<const T> other) const
{
if (size() < other.size())
return false;
return TypedTransfer<T>::compare(data(), other.data(), other.size());
}
[[nodiscard]] ALWAYS_INLINE constexpr const T& at(size_t index) const
{
VERIFY(index < this->m_size);
return this->m_values[index];
}
[[nodiscard]] ALWAYS_INLINE constexpr T& at(size_t index)
{
VERIFY(index < this->m_size);
return this->m_values[index];
}
[[nodiscard]] ALWAYS_INLINE constexpr const T& operator[](size_t index) const
{
return at(index);
}
[[nodiscard]] ALWAYS_INLINE constexpr T& operator[](size_t index)
{
return at(index);
}
ALWAYS_INLINE constexpr Span& operator=(const Span<T>& other)
{
this->m_size = other.m_size;
this->m_values = other.m_values;
return *this;
}
constexpr bool operator==(Span<const T> other) const
{
if (size() != other.size())
return false;
return TypedTransfer<T>::compare(data(), other.data(), size());
}
ALWAYS_INLINE constexpr operator Span<const T>() const
{
return { data(), size() };
}
};
using ReadonlyBytes = Span<const u8>;
using Bytes = Span<u8>;
}
using AK::Bytes;
using AK::ReadonlyBytes;
using AK::Span;
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