mirror of
https://github.com/matrix-construct/construct
synced 2024-12-25 23:14:13 +01:00
119 lines
2.4 KiB
C++
119 lines
2.4 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_B64_H
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namespace ircd::b64
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{
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IRCD_EXCEPTION(ircd::error, error)
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IRCD_EXCEPTION(error, invalid_encoding)
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using dictionary_element = int;
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using dictionary = dictionary_element[64];
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extern const dictionary
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dict_rfc1421, // [62] = '+', [63] = '/'
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dict_rfc3501, // [62] = '+', [63] = ','
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dict_rfc4648; // [62] = '-', [63] = '_'
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static const auto
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&standard { dict_rfc1421 },
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&mailbox { dict_rfc3501 },
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&urlsafe { dict_rfc4648 };
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constexpr size_t decode_size(const size_t) noexcept;
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constexpr size_t encode_size(const size_t) noexcept;
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constexpr size_t encode_unpadded_size(const size_t) noexcept;
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size_t decode_size(const string_view &in) noexcept;
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size_t encode_size(const const_buffer &in) noexcept;
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size_t encode_unpadded_size(const const_buffer &in) noexcept;
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const_buffer decode(const mutable_buffer &out, const string_view &in);
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template<const dictionary & = dict_rfc1421>
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string_view encode(const mutable_buffer &out, const const_buffer &in) noexcept;
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template<const dictionary & = dict_rfc1421>
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string_view encode_unpadded(const mutable_buffer &out, const const_buffer &in) noexcept;
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}
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inline size_t
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ircd::b64::encode_unpadded_size(const const_buffer &in)
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noexcept
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{
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return encode_unpadded_size(size(in));
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}
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inline size_t
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ircd::b64::encode_size(const const_buffer &in)
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noexcept
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{
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return encode_size(size(in));
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}
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inline size_t
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ircd::b64::decode_size(const string_view &in)
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noexcept
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{
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const size_t pads
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{
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endswith_count(in, '=')
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};
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return decode_size(size(in) - pads);
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}
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constexpr size_t
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ircd::b64::encode_unpadded_size(const size_t in)
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noexcept
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{
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constexpr long double A
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{
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4.0L / 3.0L
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};
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const auto e
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{
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in % 3 != 0
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};
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return A * in + e;
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}
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constexpr size_t
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ircd::b64::encode_size(const size_t in)
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noexcept
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{
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const auto base
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{
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encode_unpadded_size(in)
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};
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const size_t pads
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{
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(3 - in % 3) % 3
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};
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return base + pads;
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}
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constexpr size_t
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ircd::b64::decode_size(const size_t in)
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noexcept
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{
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constexpr long double A
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{
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3.0L / 4.0L
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};
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return A * in;
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}
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