mirror of
https://github.com/LadybirdBrowser/ladybird.git
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4b3715ccba
Replace the implementation of maths in `UnsignedBigInteger` and `SignedBigInteger` with LibTomMath. This gives benefits in terms of less code to maintain, correctness and speed. These changes also remove now-unsued methods and improve the error propagation for functions allocating lots of memory. Additionally, the new implementation is always trimmed and won't have dangling zeros when exporting it.
117 lines
4.6 KiB
C++
117 lines
4.6 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2022, David Tuin <davidot@serenityos.org>
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* Copyright (c) 2025, Altomani Gianluca <altomanigianluca@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibCrypto/BigInt/UnsignedBigInteger.h>
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namespace Crypto {
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struct SignedDivisionResult;
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class SignedBigInteger {
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public:
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template<Signed T>
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SignedBigInteger(T value)
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: SignedBigInteger(static_cast<i64>(value))
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{
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}
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SignedBigInteger(UnsignedBigInteger&& unsigned_data, bool sign);
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SignedBigInteger(u8 const* ptr, size_t length);
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explicit SignedBigInteger(UnsignedBigInteger const& unsigned_data);
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explicit SignedBigInteger(double value);
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explicit SignedBigInteger(i64 value);
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SignedBigInteger(SignedBigInteger const&);
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SignedBigInteger& operator=(SignedBigInteger const&);
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SignedBigInteger();
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~SignedBigInteger();
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[[nodiscard]] static SignedBigInteger import_data(StringView data) { return import_data(reinterpret_cast<u8 const*>(data.characters_without_null_termination()), data.length()); }
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[[nodiscard]] static SignedBigInteger import_data(u8 const* ptr, size_t length) { return SignedBigInteger(ptr, length); }
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size_t export_data(Bytes) const;
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[[nodiscard]] static ErrorOr<SignedBigInteger> from_base(u16 N, StringView str);
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[[nodiscard]] ErrorOr<String> to_base(u16 N) const;
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[[nodiscard]] u64 to_u64() const;
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[[nodiscard]] double to_double(UnsignedBigInteger::RoundingMode rounding_mode = UnsignedBigInteger::RoundingMode::IEEERoundAndTiesToEvenMantissa) const;
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[[nodiscard]] UnsignedBigInteger unsigned_value() const;
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[[nodiscard]] bool is_positive() const { return !is_negative() && !is_zero(); }
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[[nodiscard]] bool is_negative() const;
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[[nodiscard]] bool is_zero() const;
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void negate();
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void set_to_0();
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void set_to(i64 other);
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void set_to(SignedBigInteger const& other);
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[[nodiscard]] size_t byte_length() const;
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[[nodiscard]] SignedBigInteger plus(SignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger minus(SignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger bitwise_or(SignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger bitwise_and(SignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger bitwise_xor(SignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger bitwise_not() const;
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[[nodiscard]] ErrorOr<SignedBigInteger> shift_left(size_t num_bits) const;
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[[nodiscard]] SignedBigInteger shift_right(size_t num_bits) const;
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[[nodiscard]] SignedBigInteger multiplied_by(SignedBigInteger const& other) const;
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[[nodiscard]] SignedDivisionResult divided_by(SignedBigInteger const& divisor) const;
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[[nodiscard]] SignedBigInteger pow(u32 exponent) const;
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[[nodiscard]] ErrorOr<SignedBigInteger> mod_power_of_two(size_t power_of_two) const;
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[[nodiscard]] SignedBigInteger plus(UnsignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger minus(UnsignedBigInteger const& other) const;
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[[nodiscard]] SignedBigInteger multiplied_by(UnsignedBigInteger const& other) const;
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[[nodiscard]] SignedDivisionResult divided_by(UnsignedBigInteger const& divisor) const;
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[[nodiscard]] SignedBigInteger negated_value() const;
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[[nodiscard]] u32 hash() const;
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[[nodiscard]] bool operator==(SignedBigInteger const& other) const;
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[[nodiscard]] bool operator!=(SignedBigInteger const& other) const;
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[[nodiscard]] bool operator<(SignedBigInteger const& other) const;
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[[nodiscard]] bool operator<=(SignedBigInteger const& other) const;
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[[nodiscard]] bool operator>(SignedBigInteger const& other) const;
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[[nodiscard]] bool operator>=(SignedBigInteger const& other) const;
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[[nodiscard]] bool operator==(UnsignedBigInteger const& other) const;
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[[nodiscard]] bool operator!=(UnsignedBigInteger const& other) const;
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[[nodiscard]] bool operator<(UnsignedBigInteger const& other) const;
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[[nodiscard]] bool operator>(UnsignedBigInteger const& other) const;
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[[nodiscard]] UnsignedBigInteger::CompareResult compare_to_double(double) const;
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private:
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mp_int m_mp {};
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mutable Optional<u32> m_hash {};
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};
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struct SignedDivisionResult {
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Crypto::SignedBigInteger quotient;
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Crypto::SignedBigInteger remainder;
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};
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}
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template<>
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struct AK::Formatter<Crypto::SignedBigInteger> : AK::Formatter<Crypto::UnsignedBigInteger> {
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ErrorOr<void> format(FormatBuilder&, Crypto::SignedBigInteger const&);
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};
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inline Crypto::SignedBigInteger
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operator""_sbigint(char const* string, size_t length)
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{
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return MUST(Crypto::SignedBigInteger::from_base(10, { string, length }));
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}
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