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https://github.com/LadybirdBrowser/ladybird.git
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2ab292f381
This helper is useful on its own for things like uri encoding/decoding, so this commit exposes it via the AK/Hex header
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Array.h>
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#include <AK/ByteBuffer.h>
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#include <AK/Hex.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace AK {
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u8 decode_hex_digit(char digit)
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{
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if (digit >= '0' && digit <= '9')
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return digit - '0';
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if (digit >= 'a' && digit <= 'f')
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return 10 + (digit - 'a');
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if (digit >= 'A' && digit <= 'F')
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return 10 + (digit - 'A');
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return 255;
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}
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Optional<ByteBuffer> decode_hex(const StringView& input)
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{
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if ((input.length() % 2) != 0)
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return {};
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auto output = ByteBuffer::create_zeroed(input.length() / 2);
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for (long unsigned int i = 0; i < input.length() / 2; i++) {
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auto c1 = decode_hex_digit(input[i * 2]);
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if (c1 >= 16)
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return {};
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auto c2 = decode_hex_digit(input[i * 2 + 1]);
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if (c2 >= 16)
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return {};
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output[i] = (c1 << 4) + c2;
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}
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return output;
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}
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String encode_hex(ReadonlyBytes input)
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{
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StringBuilder output(input.size() * 2);
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for (auto ch : input)
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output.appendff("{:02x}", ch);
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return output.build();
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}
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}
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