Kernel: Add DiskPartitionMetadata Class

This class will be used to describe a partition of a StorageDevice,
without creating a DiskPartition object.

Kernel/CMakeLists.txt

@@ -36,6 +36,7 @@ set(KERNEL_SOURCES
     Devices/VMWareBackdoor.cpp
     Devices/ZeroDevice.cpp
     Storage/Partition/DiskPartition.cpp
+    Storage/Partition/DiskPartitionMetadata.cpp
     Storage/Partition/EBRPartitionTable.cpp
     Storage/Partition/GPTPartitionTable.cpp
     Storage/Partition/MBRPartitionTable.cpp

Kernel/Storage/Partition/DiskPartitionMetadata.cpp

@@ -0,0 +1,81 @@
+/*
+ * 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 <Kernel/Storage/Partition/DiskPartitionMetadata.h>
+
+namespace Kernel {
+DiskPartitionMetadata::DiskPartitionMetadata(u64 start_block, u64 end_block, ByteBuffer partition_type)
+    : m_start_block(start_block)
+    , m_end_block(end_block)
+    , m_partition_type(partition_type)
+{
+    ASSERT(!m_partition_type.is_empty());
+}
+DiskPartitionMetadata::DiskPartitionMetadata(u64 start_block, u64 end_block, ByteBuffer partition_guid, ByteBuffer unique_guid, u64 special_attributes, String name)
+    : m_start_block(start_block)
+    , m_end_block(end_block)
+    , m_partition_type(partition_guid)
+    , m_unique_guid(unique_guid)
+    , m_attributes(special_attributes)
+    , m_name(name)
+{
+    ASSERT(!m_partition_type.is_empty());
+    ASSERT(!m_unique_guid.is_empty());
+}
+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;
+}
+Optional<String> DiskPartitionMetadata::name() const
+{
+    if (m_name.is_null() || m_name.is_empty())
+        return {};
+    return m_name;
+}
+Optional<ByteBuffer> DiskPartitionMetadata::partition_type() const
+{
+    if (m_partition_type.is_null() || m_partition_type.is_empty())
+        return {};
+    return m_partition_type;
+}
+Optional<ByteBuffer> DiskPartitionMetadata::unique_guid() const
+{
+    if (m_unique_guid.is_null() || m_unique_guid.is_empty())
+        return {};
+    return m_unique_guid;
+}
+
+}

Kernel/Storage/Partition/DiskPartitionMetadata.h

@@ -0,0 +1,55 @@
+/*
+ * 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/RefPtr.h>
+#include <Kernel/Devices/BlockDevice.h>
+
+namespace Kernel {
+
+class DiskPartitionMetadata {
+public:
+    DiskPartitionMetadata(u64 block_offset, u64 block_limit, ByteBuffer partition_type);
+    DiskPartitionMetadata(u64 block_offset, u64 block_limit, ByteBuffer partition_type, ByteBuffer unique_guid, u64 special_attributes, String name);
+    u64 start_block() const;
+    u64 end_block() const;
+
+    Optional<u64> special_attributes() const;
+    Optional<String> name() const;
+    Optional<ByteBuffer> partition_type() const;
+    Optional<ByteBuffer> unique_guid() const;
+
+private:
+    u64 m_start_block;
+    u64 m_end_block;
+    ByteBuffer m_partition_type;
+    ByteBuffer m_unique_guid;
+    u64 m_attributes;
+    String m_name;
+};
+
+}