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ircd::b64: Fixes for size computing constexprs.

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This commit is contained in:
Jason Volk 2020-08-20 23:10:42 -07:00
parent e0d6c653f7
commit 385ade0154
2 changed files with 35 additions and 10 deletions
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43
include/ircd/b64.h
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@ -29,9 +29,9 @@ namespace ircd::b64
&mailbox { dict_rfc3501 },
&urlsafe { dict_rfc4648 };
constexpr size_t decode_size(const size_t &) noexcept;
constexpr size_t encode_size(const size_t &) noexcept;
constexpr size_t encode_unpadded_size(const size_t &) noexcept;
constexpr size_t decode_size(const size_t) noexcept;
constexpr size_t encode_size(const size_t) noexcept;
constexpr size_t encode_unpadded_size(const size_t) noexcept;
size_t decode_size(const string_view &in) noexcept;
size_t encode_size(const const_buffer &in) noexcept;
@ -73,22 +73,47 @@ noexcept
}
constexpr size_t
ircd::b64::encode_unpadded_size(const size_t &in)
ircd::b64::encode_unpadded_size(const size_t in)
noexcept
{
return (in * (4.0 / 3.0)) + 1; //XXX: constexpr ceil()
constexpr long double A
{
4.0L / 3.0L
};
const auto e
{
in % 3 != 0
};
return A * in + e;
}
constexpr size_t
ircd::b64::encode_size(const size_t &in)
ircd::b64::encode_size(const size_t in)
noexcept
{
return ((in * (4.0 / 3.0)) + 1) + (3 - in % 3) % 3; //XXX: constexpr ceil
const auto base
{
encode_unpadded_size(in)
};
const size_t pads
{
(3 - in % 3) % 3
};
return base + pads;
}
constexpr size_t
ircd::b64::decode_size(const size_t &in)
ircd::b64::decode_size(const size_t in)
noexcept
{
return in * (3.0 / 4.0);
constexpr long double A
{
3.0L / 4.0L
};
return A * in;
}

2
ircd/b64.cc
View file

@ -209,7 +209,7 @@ noexcept
const size_t res_len
{
size_t(ceil(size(in) * (4.0 / 3.0)))
encode_unpadded_size(in)
};
const size_t out_len