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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| // EVMC: Ethereum Client-VM Connector API. | ||
| // Copyright 2024 The EVMC Authors. | ||
| // Licensed under the Apache License, Version 2.0. | ||
| #pragma once | ||
|
|
||
| #include <algorithm> | ||
| #include <cstring> | ||
| #include <string> | ||
| #include <string_view> | ||
|
|
||
| namespace evmc | ||
| { | ||
| /// The char traits for byte-like types. | ||
| /// | ||
| /// See: https://en.cppreference.com/w/cpp/string/char_traits. | ||
| template <typename T> | ||
| struct byte_traits : std::char_traits<char> | ||
| { | ||
| static_assert(sizeof(T) == 1, "type must be a byte"); | ||
|
|
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| using char_type = T; ///< The byte type. | ||
|
|
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| /// Assigns c2 to c1. | ||
| static constexpr void assign(char_type& c1, const char_type& c2) { c1 = c2; } | ||
|
|
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| /// Assigns value to each byte in [ptr, ptr+count). | ||
| static constexpr char_type* assign(char_type* ptr, std::size_t count, char_type value) | ||
| { | ||
| std::fill_n(ptr, count, value); | ||
| return ptr; | ||
| } | ||
|
|
||
| /// Returns true if bytes are equal. | ||
| static constexpr bool eq(char_type a, char_type b) { return a == b; } | ||
|
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| /// Returns true if byte a is less than byte b. | ||
| static constexpr bool lt(char_type a, char_type b) { return a < b; } | ||
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| /// Copies count bytes from src to dest. Performs correctly even if ranges overlap. | ||
| static constexpr char_type* move(char_type* dest, const char_type* src, std::size_t count) | ||
| { | ||
| if (dest < src) | ||
| std::copy_n(src, count, dest); | ||
| else if (src < dest) | ||
| std::copy_backward(src, src + count, dest + count); | ||
| return dest; | ||
| } | ||
|
|
||
| /// Copies count bytes from src to dest. The ranges must not overlap. | ||
| static constexpr char_type* copy(char_type* dest, const char_type* src, std::size_t count) | ||
| { | ||
| std::copy_n(src, count, dest); | ||
| return dest; | ||
| } | ||
|
|
||
| /// Compares lexicographically the bytes in two ranges of equal length. | ||
| static constexpr int compare(const char_type* a, const char_type* b, std::size_t count) | ||
| { | ||
| for (; count != 0; --count, ++a, ++b) | ||
| { | ||
| if (lt(*a, *b)) | ||
| return -1; | ||
| if (lt(*b, *a)) | ||
| return 1; | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| /// Returns the length of a null-terminated byte string. | ||
| // TODO: Not constexpr | ||
| static std::size_t length(const char_type* s) | ||
| { | ||
| return std::strlen(reinterpret_cast<const char*>(s)); | ||
| } | ||
|
|
||
| /// Finds the value in the range of bytes and returns the pointer to the first occurrence | ||
| /// or nullptr if not found. | ||
| static constexpr const char_type* find(const char_type* s, | ||
| std::size_t count, | ||
| const char_type& value) | ||
| { | ||
| const auto end = s + count; | ||
| const auto p = std::find(s, end, value); | ||
| return p != end ? p : nullptr; | ||
| } | ||
| }; | ||
|
|
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| /// String of unsigned chars representing bytes. | ||
| using bytes = std::basic_string<unsigned char, byte_traits<unsigned char>>; | ||
|
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| /// String view of unsigned chars representing bytes. | ||
| using bytes_view = std::basic_string_view<unsigned char, byte_traits<unsigned char>>; | ||
| } // namespace evmc |
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