mirror of
https://github.com/matrix-construct/construct
synced 2024-12-27 07:54:05 +01:00
119 lines
2.4 KiB
C++
119 lines
2.4 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_B64_H
|
|
|
|
namespace ircd::b64
|
|
{
|
|
IRCD_EXCEPTION(ircd::error, error)
|
|
IRCD_EXCEPTION(error, invalid_encoding)
|
|
|
|
using dictionary_element = int;
|
|
using dictionary = dictionary_element[64];
|
|
|
|
extern const dictionary
|
|
dict_rfc1421, // [62] = '+', [63] = '/'
|
|
dict_rfc3501, // [62] = '+', [63] = ','
|
|
dict_rfc4648; // [62] = '-', [63] = '_'
|
|
|
|
static const auto
|
|
&standard { dict_rfc1421 },
|
|
&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;
|
|
|
|
size_t decode_size(const string_view &in) noexcept;
|
|
size_t encode_size(const const_buffer &in) noexcept;
|
|
size_t encode_unpadded_size(const const_buffer &in) noexcept;
|
|
|
|
const_buffer decode(const mutable_buffer &out, const string_view &in);
|
|
|
|
template<const dictionary & = dict_rfc1421>
|
|
string_view encode(const mutable_buffer &out, const const_buffer &in) noexcept;
|
|
|
|
template<const dictionary & = dict_rfc1421>
|
|
string_view encode_unpadded(const mutable_buffer &out, const const_buffer &in) noexcept;
|
|
}
|
|
|
|
inline size_t
|
|
ircd::b64::encode_unpadded_size(const const_buffer &in)
|
|
noexcept
|
|
{
|
|
return encode_unpadded_size(size(in));
|
|
}
|
|
|
|
inline size_t
|
|
ircd::b64::encode_size(const const_buffer &in)
|
|
noexcept
|
|
{
|
|
return encode_size(size(in));
|
|
}
|
|
|
|
inline size_t
|
|
ircd::b64::decode_size(const string_view &in)
|
|
noexcept
|
|
{
|
|
const size_t pads
|
|
{
|
|
endswith_count(in, '=')
|
|
};
|
|
|
|
return decode_size(size(in) - pads);
|
|
}
|
|
|
|
constexpr size_t
|
|
ircd::b64::encode_unpadded_size(const size_t in)
|
|
noexcept
|
|
{
|
|
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)
|
|
noexcept
|
|
{
|
|
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)
|
|
noexcept
|
|
{
|
|
constexpr long double A
|
|
{
|
|
3.0L / 4.0L
|
|
};
|
|
|
|
return A * in;
|
|
}
|