79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
/**
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* Copyright (C) 2015 Topology LP
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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// Edited by acetone, 2024
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#ifndef CPPCODEC_BASE32_RFC4648
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#define CPPCODEC_BASE32_RFC4648
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#include "detail/codec.hpp"
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#include "detail/base32.hpp"
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namespace cppcodec_samty {
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namespace detail {
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// RFC 4648 uses a simple alphabet: A-Z starting at index 0, then 2-7 starting at index 26.
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static constexpr const char base32_rfc4648_alphabet[] = {
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
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'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', // at index 26
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'2', '3', '4', '5', '6', '7'
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};
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class base32_rfc4648
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{
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public:
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template <typename Codec> using codec_impl = stream_codec<Codec, base32_rfc4648>;
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static CPPCODEC_ALWAYS_INLINE constexpr size_t alphabet_size() {
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static_assert(sizeof(base32_rfc4648_alphabet) == 32, "base32 alphabet must have 32 values");
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return sizeof(base32_rfc4648_alphabet);
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}
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static CPPCODEC_ALWAYS_INLINE constexpr char symbol(alphabet_index_t idx)
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{
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return base32_rfc4648_alphabet[idx];
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}
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static CPPCODEC_ALWAYS_INLINE constexpr char normalized_symbol(char c)
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{
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// Lower-case letters are accepted, though not generally expected.
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return (c >= 'a' && c <= 'z') ? (c - 'a' + 'A') : c;
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}
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static CPPCODEC_ALWAYS_INLINE constexpr bool generates_padding() { return false; }
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static CPPCODEC_ALWAYS_INLINE constexpr bool requires_padding() { return false; }
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static CPPCODEC_ALWAYS_INLINE constexpr char padding_symbol() { return '='; }
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static CPPCODEC_ALWAYS_INLINE constexpr bool is_padding_symbol(char c) { return c == '='; }
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static CPPCODEC_ALWAYS_INLINE constexpr bool is_eof_symbol(char c) { return c == '\0'; }
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// RFC4648 does not specify any whitespace being allowed in base32 encodings.
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static CPPCODEC_ALWAYS_INLINE constexpr bool should_ignore(char) { return false; }
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};
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} // namespace detail
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using base32_rfc4648 = detail::codec<detail::base32<detail::base32_rfc4648>>;
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} // namespace cppcodec
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#endif // CPPCODEC_BASE32_RFC4648
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