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AK: Add the UUID container

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This container represents a universally unique identifier. This will be
used later in the kernel for GUID partitions.
This commit is contained in:
Liav A 2020-12-31 11:38:12 +02:00 committed by Andreas Kling
parent d1d729370e
commit d22d29a29a
Notes: sideshowbarker 2024-07-19 00:15:19 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/d22d29a29a6
Pull-request: https://github.com/SerenityOS/serenity/pull/4686
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg
2 changed files with 154 additions and 0 deletions
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AK/UUID.cpp Normal file
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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/AllOf.h>
#include <AK/Hex.h>
#include <AK/StringBuilder.h>
#include <AK/UUID.h>
namespace AK {
UUID::UUID()
{
}
UUID::UUID(Array<u8, 16> uuid_buffer)
{
uuid_buffer.span().copy_to(m_uuid_buffer);
}
void UUID::convert_string_view_to_uuid(const StringView& uuid_string_view)
{
ASSERT(uuid_string_view.length() == 36);
auto first_unit = decode_hex(uuid_string_view.substring_view(0, 8));
auto second_unit = decode_hex(uuid_string_view.substring_view(9, 4));
auto third_unit = decode_hex(uuid_string_view.substring_view(14, 4));
auto fourth_unit = decode_hex(uuid_string_view.substring_view(19, 4));
auto fifth_unit = decode_hex(uuid_string_view.substring_view(24, 12));
m_uuid_buffer.span().overwrite(0, first_unit.value().data(), first_unit.value().size());
m_uuid_buffer.span().overwrite(4, second_unit.value().data(), second_unit.value().size());
m_uuid_buffer.span().overwrite(6, third_unit.value().data(), third_unit.value().size());
m_uuid_buffer.span().overwrite(8, fourth_unit.value().data(), fourth_unit.value().size());
m_uuid_buffer.span().overwrite(10, fifth_unit.value().data(), fifth_unit.value().size());
}
UUID::UUID(const StringView& uuid_string_view)
{
convert_string_view_to_uuid(uuid_string_view);
}
String UUID::to_string() const
{
StringBuilder builder(36);
builder.append(encode_hex(m_uuid_buffer.span().trim(4)).view());
builder.append('-');
builder.append(encode_hex(m_uuid_buffer.span().slice(4).trim(2)).view());
builder.append('-');
builder.append(encode_hex(m_uuid_buffer.span().slice(6).trim(2)).view());
builder.append('-');
builder.append(encode_hex(m_uuid_buffer.span().slice(8).trim(2)).view());
builder.append('-');
builder.append(encode_hex(m_uuid_buffer.span().slice(10).trim(6)).view());
return builder.to_string();
}
bool UUID::operator==(const UUID& other) const
{
for (size_t index = 0; index < 16; index++) {
if (m_uuid_buffer[index] != other.m_uuid_buffer[index])
return false;
}
return true;
}
bool UUID::is_zero() const
{
return all_of(m_uuid_buffer.begin(), m_uuid_buffer.end(), [](const auto octet) { return octet == 0; });
}
}

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AK/UUID.h Normal file
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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Array.h>
#include <AK/ByteBuffer.h>
#include <AK/StringView.h>
#include <AK/Types.h>
namespace AK {
class UUID {
public:
UUID();
UUID(Array<u8, 16> uuid_buffer);
UUID(const StringView&);
~UUID() { }
bool operator==(const UUID&) const;
bool operator!=(const UUID& other) const { return !(*this == other); }
bool operator<=(const UUID&) const = delete;
bool operator>=(const UUID&) const = delete;
bool operator<(const UUID&) const = delete;
bool operator>(const UUID&) const = delete;
String to_string() const;
bool is_zero() const;
private:
void convert_string_view_to_uuid(const StringView&);
void fill_buffer(ByteBuffer);
Array<u8, 16> m_uuid_buffer {};
};
}
using AK::UUID;