// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Structs.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : FreeBSD direct device access.
//
// --[ Description ] ----------------------------------------------------------
//
//     Contains [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")] structures necessary for directly interfacing devices under
//     FreeBSD.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library is distributed in the hope that it will be useful, but
//     WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2018 Natalia Portillo
// ****************************************************************************/

using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using lun_id_t = System.UInt32;
using path_id_t = System.UInt32;
using target_id_t = System.UInt32;

// ReSharper disable BuiltInTypeReferenceStyle

#pragma warning disable 649
#pragma warning disable 169

namespace DiscImageChef.Devices.FreeBSD
{
    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct AtaCmd
    {
        public CamAtaIoFlags flags;
        public byte          command;
        public byte          features;
        public byte          lba_low;
        public byte          lba_mid;
        public byte          lba_high;
        public byte          device;
        public byte          lba_low_exp;
        public byte          lba_mid_exp;
        public byte          lba_high_exp;
        public byte          features_exp;
        public byte          sector_count;
        public byte          sector_count_exp;
        public byte          control;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct AtaRes
    {
        public CamAtaIoFlags flags;
        public byte          status;
        public byte          error;
        public byte          lba_low;
        public byte          lba_mid;
        public byte          lba_high;
        public byte          device;
        public byte          lba_low_exp;
        public byte          lba_mid_exp;
        public byte          lba_high_exp;
        public byte          sector_count;
        public byte          sector_count_exp;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CamPinfo
    {
        public uint priority;
        public uint generation;
        public int  index;
    }

    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct ListEntry
    {
        /// <summary>
        ///     LIST_ENTRY(ccb_hdr)=le->*le_next
        /// </summary>
        public IntPtr LeNext;
        /// <summary>
        ///     LIST_ENTRY(ccb_hdr)=le->**le_prev
        /// </summary>
        public IntPtr LePrev;
    }

    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct SlistEntry
    {
        /// <summary>
        ///     SLIST_ENTRY(ccb_hdr)=sle->*sle_next
        /// </summary>
        public IntPtr SleNext;
    }

    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct TailqEntry
    {
        /// <summary>
        ///     TAILQ_ENTRY(ccb_hdr)=tqe->*tqe_next
        /// </summary>
        public IntPtr TqeNext;
        /// <summary>
        ///     TAILQ_ENTRY(ccb_hdr)=tqe->**tqe_prev
        /// </summary>
        public IntPtr TqePrev;
    }

    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct StailqEntry
    {
        /// <summary>
        ///     STAILQ_ENTRY(ccb_hdr)=stqe->*stqe_next
        /// </summary>
        public IntPtr StqeNext;
    }

    [StructLayout(LayoutKind.Explicit)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CamqEntry
    {
        [FieldOffset(0)] public ListEntry   le;
        [FieldOffset(0)] public SlistEntry  sle;
        [FieldOffset(0)] public TailqEntry  tqe;
        [FieldOffset(0)] public StailqEntry stqe;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct Timeval
    {
        public long tv_sec;
        /// <summary>long</summary>
        public IntPtr tv_usec;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbQosArea
    {
        public Timeval etime;
        public UIntPtr sim_data;
        public UIntPtr periph_data;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbHdr
    {
        public CamPinfo  pinfo;
        public CamqEntry xpt_links;
        public CamqEntry sim_links;
        public CamqEntry periph_links;
        public uint      retry_count;
        public IntPtr    cbfcnp;
        public XptOpcode func_code;
        public CamStatus status;
        public IntPtr    path;
        public uint      path_id;
        public uint      target_id;
        public ulong     target_lun;
        public CcbFlags  flags;
        public uint      xflags;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
        public IntPtr[] periph_priv;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
        public IntPtr[] sim_priv;
        public CcbQosArea qos;
        public uint       timeout;
        public Timeval    softtimeout;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct ScsiSenseData
    {
        const  int  SSD_FULL_SIZE = 252;
        public byte error_code;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = SSD_FULL_SIZE - 1)]
        public byte[] sense_buf;
    }

    /// <summary>
    ///     SCSI I/O Request CCB used for the XPT_SCSI_IO and XPT_CONT_TARGET_IO function codes.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbScsiio
    {
        public CcbHdr ccb_h;
        /// <summary>Ptr for next CCB for action</summary>
        public IntPtr next_ccb;
        /// <summary>Ptr to mapping info</summary>
        public IntPtr req_map;
        /// <summary>Ptr to the data buf/SG list</summary>
        public IntPtr data_ptr;
        /// <summary>Data transfer length</summary>
        public uint dxfer_len;
        /// <summary>Autosense storage</summary>
        public ScsiSenseData sense_data;
        /// <summary>Number of bytes to autosense</summary>
        public byte sense_len;
        /// <summary>Number of bytes for the CDB</summary>
        public byte cdb_len;
        /// <summary>Number of SG list entries</summary>
        public short sglist_cnt;
        /// <summary>Returned SCSI status</summary>
        public byte scsi_status;
        /// <summary>Autosense resid length: 2's comp</summary>
        public sbyte sense_resid;
        /// <summary>Transfer residual length: 2's comp</summary>
        public int resid;
        /// <summary>
        ///     Area for the CDB send, or pointer to the CDB bytes to send
        /// </summary>
        const int IOCDBLEN = 16;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = IOCDBLEN)]
        public byte[] cdb_bytes;
        /// <summary>Pointer to the message buffer</summary>
        public IntPtr msg_ptr;
        /// <summary>Number of bytes for the Message</summary>
        public short msg_len;
        /// <summary>
        ///     What to do for tag queueing. The tag action should be either the define below (to send a non-tagged
        ///     transaction) or one of the defined scsi tag messages from scsi_message.h.
        /// </summary>
        public byte tag_action;
        /// <summary>tag id from initator (target mode)</summary>
        public uint tag_id;
        /// <summary>initiator id of who selected</summary>
        public uint init_id;
    }

    /// <summary>
    ///     SCSI I/O Request CCB used for the XPT_SCSI_IO and XPT_CONT_TARGET_IO function codes.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbScsiio64
    {
        public CcbHdr ccb_h;
        /// <summary>Ptr for next CCB for action</summary>
        public IntPtr next_ccb;
        /// <summary>Ptr to mapping info</summary>
        public IntPtr req_map;
        /// <summary>Ptr to the data buf/SG list</summary>
        public IntPtr data_ptr;
        /// <summary>Data transfer length</summary>
        public uint dxfer_len;
        /// <summary>Autosense storage</summary>
        public ScsiSenseData sense_data;
        /// <summary>Number of bytes to autosense</summary>
        public byte sense_len;
        /// <summary>Number of bytes for the CDB</summary>
        public byte cdb_len;
        /// <summary>Number of SG list entries</summary>
        public short sglist_cnt;
        /// <summary>Returned SCSI status</summary>
        public byte scsi_status;
        /// <summary>Autosense resid length: 2's comp</summary>
        public sbyte sense_resid;
        /// <summary>Transfer residual length: 2's comp</summary>
        public int resid;
        public uint alignment;
        /// <summary>
        ///     Area for the CDB send, or pointer to the CDB bytes to send
        /// </summary>
        const int IOCDBLEN = 16;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = IOCDBLEN)]
        public byte[] cdb_bytes;
        /// <summary>Pointer to the message buffer</summary>
        public IntPtr msg_ptr;
        /// <summary>Number of bytes for the Message</summary>
        public short msg_len;
        /// <summary>
        ///     What to do for tag queueing. The tag action should be either the define below (to send a non-tagged
        ///     transaction) or one of the defined scsi tag messages from scsi_message.h.
        /// </summary>
        public byte tag_action;
        /// <summary>tag id from initator (target mode)</summary>
        public uint tag_id;
        /// <summary>initiator id of who selected</summary>
        public uint init_id;
    }

    /// <summary>
    ///     ATA I/O Request CCB used for the XPT_ATA_IO function code.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbAtaio
    {
        public CcbHdr ccb_h;
        /// <summary>Ptr for next CCB for action</summary>
        public IntPtr next_ccb;
        /// <summary>ATA command register set</summary>
        public AtaCmd cmd;
        /// <summary>ATA result register set</summary>
        public AtaRes res;
        /// <summary>Ptr to the data buf/SG list</summary>
        public IntPtr data_ptr;
        /// <summary>Data transfer length</summary>
        public uint dxfer_len;
        /// <summary>Transfer residual length: 2's comp</summary>
        public int resid;
        /// <summary>Flags for the rest of the buffer</summary>
        public byte ata_flags;
        public uint aux;
        public uint unused;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct NvmeCommand
    {
        ushort opc_fuse_rsvd1;
        /// <summary>
        ///     command identifier
        /// </summary>
        public ushort cid;
        /// <summary>
        ///     namespace identifier
        /// </summary>
        public uint nsid;
        /// <summary>
        ///     reserved
        /// </summary>
        public uint rsvd2;
        /// <summary>
        ///     reserved
        /// </summary>
        public uint rsvd3;
        /// <summary>
        ///     metadata pointer
        /// </summary>
        public ulong mptr;
        /// <summary>
        ///     prp entry 1
        /// </summary>
        public ulong prp1;
        /// <summary>
        ///     prp entry 2
        /// </summary>
        public ulong prp2;
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw10;
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw11;
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw12;
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw13;
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw14;
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw15;

        /// <summary>
        ///     opcode
        /// </summary>
        public byte Opc => (byte)((opc_fuse_rsvd1 & 0xFF00) >> 8);
        /// <summary>
        ///     fused operation
        /// </summary>
        public byte Fuse => (byte)((opc_fuse_rsvd1 & 0xC0) >> 6);
        /// <summary>
        ///     reserved
        /// </summary>
        public byte Rsvd1 => (byte)(opc_fuse_rsvd1 & 0x3F);
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct NvmeStatus
    {
        ushort status;

        /// <summary>
        ///     phase tag
        /// </summary>
        public byte P => (byte)((status & 0x8000) >> 15);

        /// <summary>
        ///     status code
        /// </summary>
        public byte Sc => (byte)((status & 0x7F80) >> 7);

        /// <summary>
        ///     status code type
        /// </summary>
        public byte Sct => (byte)((status & 0x70) >> 4);

        /// <summary>
        ///     reserved
        /// </summary>
        public byte Rsvd2 => (byte)((status & 0xC) >> 15);

        /// <summary>
        ///     more
        /// </summary>
        public byte M => (byte)((status & 0x2) >> 1);

        /// <summary>
        ///     do not retry
        /// </summary>
        public byte Dnr => (byte)(status & 0x1);
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct NvmeCompletion
    {
        /// <summary>
        ///     command-specific
        /// </summary>
        public uint cdw0;

        /// <summary>
        ///     reserved
        /// </summary>
        public uint rsvd1;

        /// <summary>
        ///     submission queue head pointer
        /// </summary>
        public ushort sqhd;

        /// <summary>
        ///     submission queue identifier
        /// </summary>
        public ushort sqid;

        /// <summary>
        ///     command identifier
        /// </summary>
        public ushort cid;

        public NvmeStatus status;
    }

    /// <summary>
    ///     NVMe I/O Request CCB used for the XPT_NVME_IO and XPT_NVME_ADMIN function codes.
    /// </summary>
    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbNvmeio
    {
        public CcbHdr ccb_h;
        /// <summary>Ptr for next CCB for action</summary>
        public IntPtr next_ccb;
        /// <summary>NVME command, per NVME standard</summary>
        public NvmeCommand cmd;
        /// <summary>NVME completion, per NVME standard</summary>
        public NvmeCompletion cpl;
        /// <summary>Ptr to the data buf/SG list</summary>
        public IntPtr data_ptr;
        /// <summary>Data transfer length</summary>
        public uint dxfer_len;
        /// <summary>Number of SG list entries</summary>
        public ushort sglist_cnt;
        /// <summary>padding for removed uint32_t</summary>
        public ushort unused;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct PeriphMatchPattern
    {
        const int DEV_IDLEN = 16;

        [MarshalAs(UnmanagedType.ByValArray, SizeConst = DEV_IDLEN)]
        public byte[] periph_name;
        public uint               unit_number;
        public path_id_t          path_id;
        public target_id_t        target_id;
        public lun_id_t           target_lun;
        public PeriphPatternFlags flags;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct DeviceIdMatchPattern
    {
        public byte id_len;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
        public byte[] id;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct ScsiStaticInquiryPattern
    {
        const  int  SID_VENDOR_SIZE   = 8;
        const  int  SID_PRODUCT_SIZE  = 16;
        const  int  SID_REVISION_SIZE = 4;
        public byte type;
        public byte media_type;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = SID_VENDOR_SIZE + 1)]
        public byte[] vendor;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = SID_PRODUCT_SIZE + 1)]
        public byte[] product;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = SID_REVISION_SIZE + 1)]
        public byte[] revision;
    }

    [StructLayout(LayoutKind.Explicit)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct DeviceMatchPatternData
    {
        [FieldOffset(0)] public ScsiStaticInquiryPattern inq_pat;
        [FieldOffset(0)] public DeviceIdMatchPattern     devid_pat;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct DeviceMatchPattern
    {
        public uint                   path_id;
        public uint                   target_id;
        public uint                   target_lun;
        public DevPatternFlags        flags;
        public DeviceMatchPatternData data;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct BusMatchPattern
    {
        const int DEV_IDLEN = 16;

        public path_id_t path_id;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = DEV_IDLEN)]
        public byte[] dev_name;
        public uint     unit_number;
        public uint     bus_id;
        BusPatternFlags flags;
    }

    [StructLayout(LayoutKind.Explicit)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct MatchPattern
    {
        [FieldOffset(0)] public PeriphMatchPattern periph_pattern;
        [FieldOffset(0)] public DeviceMatchPattern device_pattern;
        [FieldOffset(0)] public BusMatchPattern    bus_pattern;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct DevMatchPattern
    {
        public DevMatchType type;
        public MatchPattern pattern;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct PeriphMatchResult
    {
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
        public byte[] periph_name;
        public uint        unit_number;
        public path_id_t   path_id;
        public target_id_t target_id;
        public lun_id_t    target_lun;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct MmcCid
    {
        public uint mid;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
        public byte[] pnm;
        public uint   psn;
        public ushort oid;
        public ushort mdt_year;
        public byte   mdt_month;
        public byte   prv;
        public byte   fwrev;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct MmcParams
    {
        /// <summary>
        ///     Card model
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 40)]
        public byte[] model;

        /// <summary>
        ///     Card OCR
        /// </summary>
        public uint card_ocr;

        /// <summary>
        ///     OCR of the IO portion of the card
        /// </summary>
        public uint io_ocr;

        /// <summary>
        ///     Card CID -- raw
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public uint[] card_cid;

        /// <summary>
        ///     Card CID -- parsed
        /// </summary>
        public MmcCid cid;

        /// <summary>
        ///     Card CSD -- raw
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public uint[] card_csd;

        /// <summary>
        ///     Card RCA
        /// </summary>
        public ushort card_rca;

        /// <summary>
        ///     What kind of card is it
        /// </summary>
        public MmcCardFeatures card_features;

        public byte sdio_func_count;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct DeviceMatchResult
    {
        public path_id_t   path_id;
        public target_id_t target_id;
        public lun_id_t    target_lun;
        public CamProto    protocol;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
        public byte[] inq_data;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 512)]
        public byte[] ident_data;
        public DevResultFlags flags;
        public MmcParams      mmc_ident_data;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct BusMatchResult
    {
        public path_id_t path_id;
        const  int       DEV_IDLEN = 16;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = DEV_IDLEN)]
        public byte[] dev_name;
        public uint unit_number;
        public uint bus_id;
    }

    [StructLayout(LayoutKind.Explicit)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct MatchResult
    {
        [FieldOffset(0)] public PeriphMatchResult periph_result;
        [FieldOffset(0)] public DeviceMatchResult device_result;
        [FieldOffset(0)] public BusMatchResult    bus_result;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct DevMatchResult
    {
        public DevMatchType type;
        public MatchResult  result;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbDmCookie
    {
        public IntPtr bus;
        public IntPtr target;
        public IntPtr device;
        public IntPtr periph;
        public IntPtr pdrv;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbDevPosition
    {
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public CamGenerations[] generations;
        DevPosType         position_type;
        public CcbDmCookie cookie;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbDevMatch
    {
        public CcbHdr     ccb_h;
        CcbDevMatchStatus status;
        public uint       num_patterns;
        public uint       pattern_buf_len;

        /// <summary>
        ///     dev_match_pattern*
        /// </summary>
        public IntPtr patterns;

        public uint num_matches;
        public uint match_buf_len;

        /// <summary>
        ///     dev_match_result*
        /// </summary>
        public IntPtr matches;

        public CcbDevPosition pos;
    }

    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CamDevice
    {
        const int MAXPATHLEN = 1024;
        const int DEV_IDLEN  = 16;
        const int SIM_IDLEN  = 16;
        /// <summary>
        ///     Pathname of the device given by the user. This may be null if the user states the device name and unit number
        ///     separately.
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAXPATHLEN)]
        public byte[] DevicePath;
        /// <summary>
        ///     Device name given by the user.
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = DEV_IDLEN + 1)]
        public byte[] GivenDevName;
        /// <summary>
        ///     Unit number given by the user.
        /// </summary>
        public uint GivenUnitNumber;
        /// <summary>
        ///     Name of the device, e.g. 'pass'
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = DEV_IDLEN + 1)]
        public byte[] DeviceName;
        /// <summary>
        ///     Unit number of the passthrough device associated with this particular device.
        /// </summary>
        public uint DevUnitNum;
        /// <summary>
        ///     Controller name, e.g. 'ahc'
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = SIM_IDLEN + 1)]
        public byte[] SimName;
        /// <summary>
        ///     Controller unit number
        /// </summary>
        public uint SimUnitNumber;
        /// <summary>
        ///     Controller bus number
        /// </summary>
        public uint BusId;
        /// <summary>
        ///     Logical Unit Number
        /// </summary>
        public lun_id_t TargetLun;
        /// <summary>
        ///     Target ID
        /// </summary>
        public target_id_t TargetId;
        /// <summary>
        ///     System SCSI bus number
        /// </summary>
        public path_id_t PathId;
        /// <summary>
        ///     type of peripheral device
        /// </summary>
        public ushort PdType;
        /// <summary>
        ///     SCSI Inquiry data
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
        public byte[] InqData;
        /// <summary>
        ///     device serial number
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 252)]
        public byte[] SerialNum;
        /// <summary>
        ///     length of the serial number
        /// </summary>
        public byte SerialNumLen;
        /// <summary>
        ///     Negotiated sync period
        /// </summary>
        public byte SyncPeriod;
        /// <summary>
        ///     Negotiated sync offset
        /// </summary>
        public byte SyncOffset;
        /// <summary>
        ///     Negotiated bus width
        /// </summary>
        public byte BusWidth;
        /// <summary>
        ///     file descriptor for device
        /// </summary>
        public int Fd;
    }

    [StructLayout(LayoutKind.Sequential)]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    struct CcbGetdev
    {
        public CcbHdr   ccb_h;
        public CamProto protocol;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
        public byte[] inq_data;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 512)]
        public byte[] ident_data;
        /// <summary>
        ///     device serial number
        /// </summary>
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 252)]
        public byte[] serial_num;
        public byte inq_flags;
        /// <summary>
        ///     length of the serial number
        /// </summary>
        public byte serial_num_len;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
        public IntPtr[] padding;
    }
}