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LibCrypto: Add {Signed,Unsigned}BigInteger::from_base{2, 8, 16} helpers

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These can be used to create BigInteger instances from non-decimal
number strings.
This commit is contained in:
Idan Horowitz 2021-06-14 02:18:06 +03:00 • committed by Linus Groh
parent e4e6e03364
commit 2ad2e055e2
4 changed files with 69 additions and 2 deletions
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29
Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
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@ -27,7 +27,7 @@ size_t SignedBigInteger::export_data(Bytes data, bool remove_leading_zeros) cons
return m_unsigned_data.export_data(bytes_view, remove_leading_zeros) + 1;
}
SignedBigInteger SignedBigInteger::from_base10(StringView str)
static bool parse_sign(StringView& str)
{
bool sign = false;
if (str.length() > 1) {
@ -39,10 +39,37 @@ SignedBigInteger SignedBigInteger::from_base10(StringView str)
if (maybe_sign == '+')
str = str.substring_view(1, str.length() - 1);
}
return sign;
}
SignedBigInteger SignedBigInteger::from_base10(StringView str)
{
auto sign = parse_sign(str);
auto unsigned_data = UnsignedBigInteger::from_base10(str);
return { move(unsigned_data), sign };
}
SignedBigInteger SignedBigInteger::from_base2(StringView str)
{
auto sign = parse_sign(str);
auto unsigned_data = UnsignedBigInteger::from_base2(str);
return { move(unsigned_data), sign };
}
SignedBigInteger SignedBigInteger::from_base8(StringView str)
{
auto sign = parse_sign(str);
auto unsigned_data = UnsignedBigInteger::from_base8(str);
return { move(unsigned_data), sign };
}
SignedBigInteger SignedBigInteger::from_base16(StringView str)
{
auto sign = parse_sign(str);
auto unsigned_data = UnsignedBigInteger::from_base16(str);
return { move(unsigned_data), sign };
}
String SignedBigInteger::to_base10() const
{
StringBuilder builder;