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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/ByteBuffer.h>
#include <AK/Hex.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <AK/Vector.h>
namespace AK {
Optional<ByteBuffer> decode_hex(const StringView& input)
{
if ((input.length() % 2) != 0)
return {};
auto output_result = ByteBuffer::create_zeroed(input.length() / 2);
if (!output_result.has_value())
return {};
auto& output = output_result.value();
for (size_t i = 0; i < input.length() / 2; ++i) {
const auto c1 = decode_hex_digit(input[i * 2]);
if (c1 >= 16)
return {};
const auto c2 = decode_hex_digit(input[i * 2 + 1]);
if (c2 >= 16)
return {};
output[i] = (c1 << 4) + c2;
}
return output_result;
}
String encode_hex(const ReadonlyBytes input)
{
StringBuilder output(input.size() * 2);
for (auto ch : input)
output.appendff("{:02x}", ch);
return output.build();
}
}
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