76 lines
2.9 KiB
C++
76 lines
2.9 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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#ifndef CPPCODEC_HEX_LOWER
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#define CPPCODEC_HEX_LOWER
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#include "detail/codec.hpp"
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#include "detail/hex.hpp"
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namespace cppcodec {
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namespace detail {
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static constexpr const char hex_lower_alphabet[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', // at index 10
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'a', 'b', 'c', 'd', 'e', 'f'
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};
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class hex_lower
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{
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public:
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template <typename Codec> using codec_impl = stream_codec<Codec, hex_lower>;
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static CPPCODEC_ALWAYS_INLINE constexpr size_t alphabet_size() {
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static_assert(sizeof(hex_lower_alphabet) == 16, "hex alphabet must have 16 values");
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return sizeof(hex_lower_alphabet);
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}
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static CPPCODEC_ALWAYS_INLINE constexpr char symbol(alphabet_index_t index)
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{
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return hex_lower_alphabet[index];
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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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// Hex decoding is always case-insensitive (even in RFC 4648), the question
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// is only for encoding whether to use upper-case or lower-case letters.
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return (c >= 'A' && c <= 'F') ? (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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// FIXME: doesn't require padding, but requires a multiple of the encoded block size (2)
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static CPPCODEC_ALWAYS_INLINE constexpr bool requires_padding() { return false; }
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static CPPCODEC_ALWAYS_INLINE constexpr bool is_padding_symbol(char) { return false; }
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static CPPCODEC_ALWAYS_INLINE constexpr bool is_eof_symbol(char c) { return c == '\0'; }
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// Sometimes hex strings include whitespace, but this variant forbids it.
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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 hex_lower = detail::codec<detail::hex<detail::hex_lower>>;
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} // namespace cppcodec
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#endif // CPPCODEC_HEX_LOWER
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