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device/cppcodec/hex_lower.hpp

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+/**
+ *  Copyright (C) 2015 Topology LP
+ *  All rights reserved.
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to
+ *  deal in the Software without restriction, including without limitation the
+ *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ *  sell copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#ifndef CPPCODEC_HEX_LOWER
+#define CPPCODEC_HEX_LOWER
+
+#include "detail/codec.hpp"
+#include "detail/hex.hpp"
+
+namespace cppcodec {
+
+namespace detail {
+
+static constexpr const char hex_lower_alphabet[] = {
+        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', // at index 10
+        'a', 'b', 'c', 'd', 'e', 'f'
+};
+
+class hex_lower
+{
+public:
+    template <typename Codec> using codec_impl = stream_codec<Codec, hex_lower>;
+
+    static CPPCODEC_ALWAYS_INLINE constexpr size_t alphabet_size() {
+        static_assert(sizeof(hex_lower_alphabet) == 16, "hex alphabet must have 16 values");
+        return sizeof(hex_lower_alphabet);
+    }
+    static CPPCODEC_ALWAYS_INLINE constexpr char symbol(alphabet_index_t index)
+    {
+        return hex_lower_alphabet[index];
+    }
+    static CPPCODEC_ALWAYS_INLINE constexpr char normalized_symbol(char c)
+    {
+        // Hex decoding is always case-insensitive (even in RFC 4648), the question
+        // is only for encoding whether to use upper-case or lower-case letters.
+        return (c >= 'A' && c <= 'F') ? (c - 'A' + 'a') : c;
+    }
+
+    static CPPCODEC_ALWAYS_INLINE constexpr bool generates_padding() { return false; }
+    // FIXME: doesn't require padding, but requires a multiple of the encoded block size (2)
+    static CPPCODEC_ALWAYS_INLINE constexpr bool requires_padding() { return false; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool is_padding_symbol(char) { return false; }
+    static CPPCODEC_ALWAYS_INLINE constexpr bool is_eof_symbol(char c) { return c == '\0'; }
+
+    // Sometimes hex strings include whitespace, but this variant forbids it.
+    static CPPCODEC_ALWAYS_INLINE constexpr bool should_ignore(char) { return false; }
+};
+
+} // namespace detail
+
+using hex_lower = detail::codec<detail::hex<detail::hex_lower>>;
+
+} // namespace cppcodec
+
+#endif // CPPCODEC_HEX_LOWER