Kernel+LibPartition: Move DiskPartitionMetadata into LibPartition

This commit creates a new library LibPartition which will contain
partition related code sharable between Kernel and Userland and
includes DiskPartitionMetadata as the first shared class.

3 files changed, 155 insertions, 0 deletions

diff --git a/Userland/Libraries/LibPartition/CMakeLists.txt b/Userland/Libraries/LibPartition/CMakeLists.txt
new file mode 100644
index 0000000000..83751ec44b
--- /dev/null
+++ b/Userland/Libraries/LibPartition/CMakeLists.txt
@@ -0,0 +1,5 @@
+set(SOURCES
+    DiskPartitionMetadata.cpp
+)
+
+serenity_lib(LibPartition partition)
diff --git a/Userland/Libraries/LibPartition/DiskPartitionMetadata.cpp b/Userland/Libraries/LibPartition/DiskPartitionMetadata.cpp
new file mode 100644
index 0000000000..0ce3eced3b
--- /dev/null
+++ b/Userland/Libraries/LibPartition/DiskPartitionMetadata.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibPartition/DiskPartitionMetadata.h>
+
+namespace Partition {
+
+DiskPartitionMetadata::PartitionType::PartitionType(u8 partition_type)
+{
+    m_partition_type[0] = partition_type;
+}
+DiskPartitionMetadata::PartitionType::PartitionType(Array<u8, 16> partition_type)
+    : m_partition_type_is_uuid(true)
+{
+    m_partition_type.span().overwrite(0, partition_type.data(), partition_type.size());
+}
+UUID DiskPartitionMetadata::PartitionType::to_uuid() const
+{
+    VERIFY(is_uuid());
+    return m_partition_type;
+}
+u8 DiskPartitionMetadata::PartitionType::to_byte_indicator() const
+{
+    VERIFY(!is_uuid());
+    return m_partition_type[0];
+}
+bool DiskPartitionMetadata::PartitionType::is_uuid() const
+{
+    return m_partition_type_is_uuid;
+}
+bool DiskPartitionMetadata::PartitionType::is_valid() const
+{
+    return !all_of(m_partition_type, [](auto const octet) { return octet == 0; });
+}
+
+DiskPartitionMetadata::DiskPartitionMetadata(u64 start_block, u64 end_block, u8 partition_type)
+    : m_start_block(start_block)
+    , m_end_block(end_block)
+    , m_type(partition_type)
+{
+    VERIFY(m_type.is_valid());
+}
+
+DiskPartitionMetadata::DiskPartitionMetadata(u64 start_block, u64 end_block, Array<u8, 16> partition_type)
+    : m_start_block(start_block)
+    , m_end_block(end_block)
+    , m_type(partition_type)
+{
+    VERIFY(m_type.is_valid());
+}
+
+DiskPartitionMetadata::DiskPartitionMetadata(u64 start_block, u64 end_block, Array<u8, 16> partition_type, UUID unique_guid, u64 special_attributes)
+    : m_start_block(start_block)
+    , m_end_block(end_block)
+    , m_type(partition_type)
+    , m_unique_guid(unique_guid)
+    , m_attributes(special_attributes)
+{
+    VERIFY(m_type.is_valid());
+    VERIFY(!m_unique_guid.is_zero());
+}
+
+DiskPartitionMetadata DiskPartitionMetadata::offset(u64 blocks_count) const
+{
+    return { blocks_count + m_start_block, blocks_count + m_end_block, m_type.m_partition_type };
+}
+
+u64 DiskPartitionMetadata::start_block() const
+{
+    return m_start_block;
+}
+
+u64 DiskPartitionMetadata::end_block() const
+{
+    return m_end_block;
+}
+
+Optional<u64> DiskPartitionMetadata::special_attributes() const
+{
+    if (m_attributes == 0)
+        return {};
+    return m_attributes;
+}
+
+DiskPartitionMetadata::PartitionType const& DiskPartitionMetadata::type() const
+{
+    return m_type;
+}
+
+const UUID& DiskPartitionMetadata::unique_guid() const
+{
+    return m_unique_guid;
+}
+
+}
diff --git a/Userland/Libraries/LibPartition/DiskPartitionMetadata.h b/Userland/Libraries/LibPartition/DiskPartitionMetadata.h
new file mode 100644
index 0000000000..252be047a7
--- /dev/null
+++ b/Userland/Libraries/LibPartition/DiskPartitionMetadata.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/UUID.h>
+
+namespace Partition {
+
+class DiskPartitionMetadata {
+private:
+    class PartitionType {
+        friend class DiskPartitionMetadata;
+
+    public:
+        explicit PartitionType(u8 partition_type);
+        explicit PartitionType(Array<u8, 16> partition_type);
+        UUID to_uuid() const;
+        u8 to_byte_indicator() const;
+        bool is_uuid() const;
+        bool is_valid() const;
+
+    private:
+        Array<u8, 16> m_partition_type {};
+        bool m_partition_type_is_uuid { false };
+    };
+
+public:
+    DiskPartitionMetadata(u64 block_offset, u64 block_limit, u8 partition_type);
+    DiskPartitionMetadata(u64 start_block, u64 end_block, Array<u8, 16> partition_type);
+    DiskPartitionMetadata(u64 block_offset, u64 block_limit, Array<u8, 16> partition_type, UUID unique_guid, u64 special_attributes);
+    u64 start_block() const;
+    u64 end_block() const;
+
+    DiskPartitionMetadata offset(u64 blocks_count) const;
+
+    Optional<u64> special_attributes() const;
+    PartitionType const& type() const;
+    const UUID& unique_guid() const;
+
+private:
+    u64 m_start_block;
+    u64 m_end_block;
+    PartitionType m_type;
+    UUID m_unique_guid {};
+    u64 m_attributes { 0 };
+};
+
+}