/*

  This Source Code Form is subject to the terms of the Mozilla Public

  License, v. 2.0. If a copy of the MPL was not distributed with this

  file, You can obtain one at http://mozilla.org/MPL/2.0/.

  Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>

*/

using System;

using System.Collections.Generic;

using System.IO;

using System.Management;

using System.Text;

namespace OpenHardwareMonitor.Hardware {

  internal class SMBIOS {

    private readonly byte[] raw;

    private readonly Structure[] table;

    private readonly Version version;

    private readonly BIOSInformation biosInformation;

    private readonly SystemInformation systemInformation;

    private readonly BaseBoardInformation baseBoardInformation;

    private readonly MemoryDevice[] memoryDevices;

    private static string ReadSysFS(string path) {

      try {

        if (File.Exists(path)) {

          using (StreamReader reader = new StreamReader(path)) 

            return reader.ReadLine();

        } else {

          return null;

        }

      } catch {

        return null;

      }

    }

    public SMBIOS() {

      int p = (int)Environment.OSVersion.Platform;

      if ((p == 4) || (p == 128)) {

        this.raw = null;

        this.table = null;

        string boardVendor = ReadSysFS("/sys/class/dmi/id/board_vendor");

        string boardName = ReadSysFS("/sys/class/dmi/id/board_name");        

        string boardVersion = ReadSysFS("/sys/class/dmi/id/board_version");        

        this.baseBoardInformation = new BaseBoardInformation(

          boardVendor, boardName, boardVersion, null);

        string systemVendor = ReadSysFS("/sys/class/dmi/id/sys_vendor");

        string productName = ReadSysFS("/sys/class/dmi/id/product_name");

        string productVersion = ReadSysFS("/sys/class/dmi/id/product_version");    

        this.systemInformation = new SystemInformation(systemVendor, 

          productName, productVersion, null, null);

        string biosVendor = ReadSysFS("/sys/class/dmi/id/bios_vendor");

        string biosVersion = ReadSysFS("/sys/class/dmi/id/bios_version");

        this.biosInformation = new BIOSInformation(biosVendor, biosVersion);

        this.memoryDevices = new MemoryDevice[0];

      } else {              

        List<Structure> structureList = new List<Structure>();

        List<MemoryDevice> memoryDeviceList = new List<MemoryDevice>();

        raw = null;

        byte majorVersion = 0;

        byte minorVersion = 0;

        try {

          ManagementObjectCollection collection;

          using (ManagementObjectSearcher searcher = 

            new ManagementObjectSearcher("root\\WMI", 

              "SELECT * FROM MSSMBios_RawSMBiosTables")) {

            collection = searcher.Get();

          }

          foreach (ManagementObject mo in collection) {

            raw = (byte[])mo["SMBiosData"];

            majorVersion = (byte)mo["SmbiosMajorVersion"];

            minorVersion = (byte)mo["SmbiosMinorVersion"];            

            break;

          }

        } catch { }

        if (majorVersion > 0 || minorVersion > 0)

          version = new Version(majorVersion, minorVersion);

        if (raw != null && raw.Length > 0) {

          int offset = 0;

          byte type = raw[offset];

          while (offset + 4 < raw.Length && type != 127) {

            type = raw[offset];

            int length = raw[offset + 1];

            ushort handle = (ushort)((raw[offset + 2] << 8) | raw[offset + 3]);

            if (offset + length > raw.Length)

              break;

            byte[] data = new byte[length];

            Array.Copy(raw, offset, data, 0, length);

            offset += length;

            List<string> stringsList = new List<string>();

            if (offset < raw.Length && raw[offset] == 0)

              offset++;

            while (offset < raw.Length && raw[offset] != 0) {

              StringBuilder sb = new StringBuilder();

              while (offset < raw.Length && raw[offset] != 0) {

                sb.Append((char)raw[offset]); offset++;

              }

              offset++;

              stringsList.Add(sb.ToString());

            }

            offset++;

            switch (type) {

              case 0x00:

                this.biosInformation = new BIOSInformation(

                  type, handle, data, stringsList.ToArray());

                structureList.Add(this.biosInformation); break;

              case 0x01:

                this.systemInformation = new SystemInformation(

                  type, handle, data, stringsList.ToArray());

                structureList.Add(this.systemInformation); break;

              case 0x02: this.baseBoardInformation = new BaseBoardInformation(

                  type, handle, data, stringsList.ToArray());

                structureList.Add(this.baseBoardInformation); break;

              case 0x11: MemoryDevice m = new MemoryDevice(

                  type, handle, data, stringsList.ToArray());

                memoryDeviceList.Add(m);

                structureList.Add(m); break;

              default: structureList.Add(new Structure(

                type, handle, data, stringsList.ToArray())); break;

            }

          }

        }

        memoryDevices = memoryDeviceList.ToArray();

        table = structureList.ToArray();

      }

    }

    public string GetReport() {

      StringBuilder r = new StringBuilder();

      if (version != null) {

        r.Append("SMBIOS Version: "); r.AppendLine(version.ToString(2));

        r.AppendLine();

      }

      if (BIOS != null) {

        r.Append("BIOS Vendor: "); r.AppendLine(BIOS.Vendor);

        r.Append("BIOS Version: "); r.AppendLine(BIOS.Version);

        r.AppendLine();

      }

      if (System != null) {

        r.Append("System Manufacturer: ");

        r.AppendLine(System.ManufacturerName);

        r.Append("System Name: ");

        r.AppendLine(System.ProductName);

        r.Append("System Version: ");

        r.AppendLine(System.Version);

        r.AppendLine();

      }

      if (Board != null) {

        r.Append("Mainboard Manufacturer: ");

        r.AppendLine(Board.ManufacturerName);

        r.Append("Mainboard Name: ");

        r.AppendLine(Board.ProductName);

        r.Append("Mainboard Version: ");

        r.AppendLine(Board.Version);

        r.AppendLine();

      }

      for (int i = 0; i < MemoryDevices.Length; i++) {        

        r.Append("Memory Device [" + i + "] Manufacturer: ");

        r.AppendLine(MemoryDevices[i].ManufacturerName);

        r.Append("Memory Device [" + i + "] Part Number: ");

        r.AppendLine(MemoryDevices[i].PartNumber);

        r.AppendLine();

      }

      if (raw != null) {

        string base64 = Convert.ToBase64String(raw);

        r.AppendLine("SMBIOS Table");

        r.AppendLine();

        for (int i = 0; i < Math.Ceiling(base64.Length / 64.0); i++) {

          r.Append(" ");

          for (int j = 0; j < 0x40; j++) {

            int index = (i << 6) | j;

            if (index < base64.Length) {              

              r.Append(base64[index]);

            }

          }

          r.AppendLine();

        }

        r.AppendLine();

      }

      return r.ToString();

    }

    public BIOSInformation BIOS {

      get { return biosInformation; }

    }

    public SystemInformation System {

      get { return systemInformation; }

    }

    public BaseBoardInformation Board {

      get { return baseBoardInformation; }

    }

    public MemoryDevice[] MemoryDevices {

      get { return memoryDevices; }

    }

    public class Structure {

      private readonly byte type;

      private readonly ushort handle;

      private readonly byte[] data;

      private readonly string[] strings;

      protected string GetString(int offset) {

        if (offset < data.Length && data[offset] > 0 &&

         data[offset] <= strings.Length)

          return strings[data[offset] - 1];

        else

          return "";

      }

      public Structure(byte type, ushort handle, byte[] data, string[] strings) 

      {

        this.type = type;

        this.handle = handle;

        this.data = data;

        this.strings = strings;

      }

      public byte Type { get { return type; } }

      public ushort Handle { get { return handle; } }

    }

    public class BIOSInformation : Structure {

      private readonly string vendor;

      private readonly string version;

      public BIOSInformation(string vendor, string version) 

        : base (0x00, 0, null, null) 

      {

        this.vendor = vendor;

        this.version = version;

      }

      public BIOSInformation(byte type, ushort handle, byte[] data,

        string[] strings)

        : base(type, handle, data, strings) 

      {

        this.vendor = GetString(0x04);

        this.version = GetString(0x05);

      }

      public string Vendor { get { return vendor; } }

      public string Version { get { return version; } }

    }

    public class SystemInformation : Structure {

      private readonly string manufacturerName;

      private readonly string productName;

      private readonly string version;

      private readonly string serialNumber;

      private readonly string family;

      public SystemInformation(string manufacturerName, string productName, 

        string version, string serialNumber, string family) 

        : base (0x01, 0, null, null) 

      {

        this.manufacturerName = manufacturerName;

        this.productName = productName;

        this.version = version;

        this.serialNumber = serialNumber;

        this.family = family;

      }

      public SystemInformation(byte type, ushort handle, byte[] data,

        string[] strings)

        : base(type, handle, data, strings) 

      {

        this.manufacturerName = GetString(0x04);

        this.productName = GetString(0x05);

        this.version = GetString(0x06);

        this.serialNumber = GetString(0x07);

        this.family = GetString(0x1A);

      }

      public string ManufacturerName { get { return manufacturerName; } }

      public string ProductName { get { return productName; } }

      public string Version { get { return version; } }

      public string SerialNumber { get { return serialNumber; } }

      public string Family { get { return family; } }

    }

    public class BaseBoardInformation : Structure {

      private readonly string manufacturerName;

      private readonly string productName;

      private readonly string version;

      private readonly string serialNumber;

      public BaseBoardInformation(string manufacturerName, string productName, 

        string version, string serialNumber) 

        : base(0x02, 0, null, null) 

      {

        this.manufacturerName = manufacturerName;

        this.productName = productName;

        this.version = version;

        this.serialNumber = serialNumber;

      }

      public BaseBoardInformation(byte type, ushort handle, byte[] data,

        string[] strings)

        : base(type, handle, data, strings) {

        this.manufacturerName = GetString(0x04).Trim();

        this.productName = GetString(0x05).Trim();

        this.version = GetString(0x06).Trim();

        this.serialNumber = GetString(0x07).Trim();               

      }

      public string ManufacturerName { get { return manufacturerName; } }

      public string ProductName { get { return productName; } }

      public string Version { get { return version; } }

      public string SerialNumber { get { return serialNumber; } }

    }

    public class MemoryDevice : Structure {

      private readonly string manufacturerName;

      private readonly string serialNumber;

      private readonly string partNumber;

      public MemoryDevice(string manufacturerName, string serialNumber,

        string partNumber)

        : base(0x11, 0, null, null) {

        this.manufacturerName = manufacturerName;

        this.serialNumber = serialNumber;

        this.partNumber = partNumber;

      }

      public MemoryDevice(byte type, ushort handle, byte[] data,

        string[] strings)

        : base(type, handle, data, strings) {

        this.manufacturerName = GetString(0x17).Trim();

        this.serialNumber = GetString(0x18).Trim();

        this.partNumber = GetString(0x1A).Trim();

      }

      public string ManufacturerName { get { return manufacturerName; } }

      public string SerialNumber { get { return serialNumber; } }

      public string PartNumber { get { return partNumber; } }

    }

  }

}