/* Copyright (C) 2017 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
 * 
 * You can redistribute this program and/or modify it under the terms of
 * the GNU Lesser Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 */
using System;
using System.Collections.Generic;
using Utilities;

namespace SMBLibrary
{
    /// <summary>
    /// [MS-FSCC] 2.5.1 - FileFsAttributeInformation
    /// </summary>
    public class FileFsAttributeInformation : FileSystemInformation
    {
        public const int FixedLength = 12;

        public FileSystemAttributes FileSystemAttributes;
        /// <summary>
        /// Maximum file name component length, in bytes, supported by the specified file system.
        /// The value of this field MUST be greater than zero and MUST be no more than 510.
        /// </summary>
        public uint MaximumComponentNameLength;
        private uint FileSystemNameLength;
        public string FileSystemName = String.Empty;

        public FileFsAttributeInformation()
        {
        }

        public FileFsAttributeInformation(byte[] buffer, int offset)
        {
            FileSystemAttributes = (FileSystemAttributes)LittleEndianConverter.ToUInt32(buffer, offset + 0);
            MaximumComponentNameLength = LittleEndianConverter.ToUInt32(buffer, offset + 4);
            FileSystemNameLength = LittleEndianConverter.ToUInt32(buffer, offset + 8);
            FileSystemName = ByteReader.ReadUTF16String(buffer, offset + 12, (int)FileSystemNameLength / 2);
        }

        public override void WriteBytes(byte[] buffer, int offset)
        {
            FileSystemNameLength = (uint)(FileSystemName.Length * 2);
            LittleEndianWriter.WriteUInt32(buffer, offset + 0, (uint)FileSystemAttributes);
            LittleEndianWriter.WriteUInt32(buffer, offset + 4, MaximumComponentNameLength);
            LittleEndianWriter.WriteUInt32(buffer, offset + 8, FileSystemNameLength);
            ByteWriter.WriteUTF16String(buffer, offset + 12, FileSystemName);
        }

        public override FileSystemInformationClass FileSystemInformationClass
        {
            get
            {
                return FileSystemInformationClass.FileFsAttributeInformation;
            }
        }

        public override int Length
        {
            get
            {
                return FixedLength + FileSystemName.Length * 2;
            }
        }
    }
}