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130 lines
4.7 KiB
C++
130 lines
4.7 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/AllOf.h>
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#include <AK/Hex.h>
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#include <AK/StringBuilder.h>
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#include <AK/UUID.h>
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namespace AK {
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UUID::UUID(Array<u8, 16> uuid_buffer)
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{
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uuid_buffer.span().copy_to(m_uuid_buffer);
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}
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void UUID::convert_string_view_to_little_endian_uuid(StringView uuid_string_view)
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{
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VERIFY(uuid_string_view.length() == 36);
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auto first_unit = MUST(decode_hex(uuid_string_view.substring_view(0, 8)));
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auto second_unit = MUST(decode_hex(uuid_string_view.substring_view(9, 4)));
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auto third_unit = MUST(decode_hex(uuid_string_view.substring_view(14, 4)));
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auto fourth_unit = MUST(decode_hex(uuid_string_view.substring_view(19, 4)));
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auto fifth_unit = MUST(decode_hex(uuid_string_view.substring_view(24, 12)));
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VERIFY(first_unit.size() == 4 && second_unit.size() == 2
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&& third_unit.size() == 2 && fourth_unit.size() == 2
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&& fifth_unit.size() == 6);
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m_uuid_buffer.span().overwrite(0, first_unit.data(), first_unit.size());
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m_uuid_buffer.span().overwrite(4, second_unit.data(), second_unit.size());
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m_uuid_buffer.span().overwrite(6, third_unit.data(), third_unit.size());
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m_uuid_buffer.span().overwrite(8, fourth_unit.data(), fourth_unit.size());
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m_uuid_buffer.span().overwrite(10, fifth_unit.data(), fifth_unit.size());
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}
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void UUID::convert_string_view_to_mixed_endian_uuid(StringView uuid_string_view)
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{
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VERIFY(uuid_string_view.length() == 36);
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auto first_unit = MUST(decode_hex(uuid_string_view.substring_view(0, 8)));
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auto second_unit = MUST(decode_hex(uuid_string_view.substring_view(9, 4)));
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auto third_unit = MUST(decode_hex(uuid_string_view.substring_view(14, 4)));
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auto fourth_unit = MUST(decode_hex(uuid_string_view.substring_view(19, 4)));
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auto fifth_unit = MUST(decode_hex(uuid_string_view.substring_view(24, 12)));
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VERIFY(first_unit.size() == 4 && second_unit.size() == 2
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&& third_unit.size() == 2 && fourth_unit.size() == 2
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&& fifth_unit.size() == 6);
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// Revert endianness for first 4 bytes
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for (size_t index = 0; index < 4; index++) {
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m_uuid_buffer[3 - index] = first_unit[index];
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}
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// Revert endianness for second 2 bytes and again for 2 bytes
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for (size_t index = 0; index < 2; index++) {
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m_uuid_buffer[3 + 2 - index] = second_unit[index];
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m_uuid_buffer[5 + 2 - index] = third_unit[index];
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}
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m_uuid_buffer.span().overwrite(8, fourth_unit.data(), fourth_unit.size());
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m_uuid_buffer.span().overwrite(10, fifth_unit.data(), fifth_unit.size());
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}
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UUID::UUID(StringView uuid_string_view, Endianness endianness)
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{
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if (endianness == Endianness::Little) {
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convert_string_view_to_little_endian_uuid(uuid_string_view);
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return;
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} else if (endianness == Endianness::Mixed) {
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convert_string_view_to_mixed_endian_uuid(uuid_string_view);
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return;
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}
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VERIFY_NOT_REACHED();
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}
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#ifdef KERNEL
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ErrorOr<NonnullOwnPtr<Kernel::KString>> UUID::to_string() const
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{
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StringBuilder builder(36);
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auto nibble0 = TRY(encode_hex(m_uuid_buffer.span().trim(4)));
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TRY(builder.try_append(nibble0->view()));
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TRY(builder.try_append('-'));
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auto nibble1 = TRY(encode_hex(m_uuid_buffer.span().slice(4).trim(2)));
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TRY(builder.try_append(nibble1->view()));
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TRY(builder.try_append('-'));
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auto nibble2 = TRY(encode_hex(m_uuid_buffer.span().slice(6).trim(2)));
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TRY(builder.try_append(nibble2->view()));
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TRY(builder.try_append('-'));
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auto nibble3 = TRY(encode_hex(m_uuid_buffer.span().slice(8).trim(2)));
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TRY(builder.try_append(nibble3->view()));
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TRY(builder.try_append('-'));
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auto nibble4 = TRY(encode_hex(m_uuid_buffer.span().slice(10).trim(6)));
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TRY(builder.try_append(nibble4->view()));
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return Kernel::KString::try_create(builder.string_view());
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}
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#else
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String UUID::to_string() const
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{
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StringBuilder builder(36);
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builder.append(encode_hex(m_uuid_buffer.span().trim(4)).view());
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builder.append('-');
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builder.append(encode_hex(m_uuid_buffer.span().slice(4).trim(2)).view());
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builder.append('-');
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builder.append(encode_hex(m_uuid_buffer.span().slice(6).trim(2)).view());
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builder.append('-');
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builder.append(encode_hex(m_uuid_buffer.span().slice(8).trim(2)).view());
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builder.append('-');
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builder.append(encode_hex(m_uuid_buffer.span().slice(10).trim(6)).view());
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return builder.to_string();
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}
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#endif
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bool UUID::operator==(const UUID& other) const
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{
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for (size_t index = 0; index < 16; index++) {
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if (m_uuid_buffer[index] != other.m_uuid_buffer[index])
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return false;
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}
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return true;
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}
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bool UUID::is_zero() const
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{
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return all_of(m_uuid_buffer, [](const auto octet) { return octet == 0; });
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}
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}
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