Initial checkin

Bwg.Scsi/ModeTable.cs

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+//
+// BwgBurn - CD-R/CD-RW/DVD-R/DVD-RW burning program for Windows XP
+// 
+// Copyright (C) 2006 by Jack W. Griffin (butchg@comcast.net)
+//
+// This program is free software; you can redistribute it and/or modify 
+// it under the terms of the GNU General Public License as published by 
+// the Free Software Foundation; either version 2 of the License, or 
+// (at your option) any later version.
+//
+// This program 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 General Public License 
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along 
+// with this program; if not, write to the 
+//
+// Free Software Foundation, Inc., 
+// 59 Temple Place, Suite 330, 
+// Boston, MA 02111-1307 USA
+//
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Runtime.InteropServices;
+
+namespace Bwg.Scsi
+{
+    /// <summary>
+    /// This class represents a mode table from the scsi device.
+    /// </summary>
+    public class ModeTable : Result
+    {
+        /// <summary>
+        /// This is the size of the header associated with a mode table.
+        /// </summary>
+        public const int ModeTableHeaderSize = 8;
+
+        /// <summary>
+        /// The set of mode pages in this mode table.
+        /// </summary>
+        public IList<ModePage> Pages;
+
+        /// <summary>
+        /// The constructor for the mode table object.  It builds the mode table from
+        /// the raw reply buffer from the SCSI device.
+        /// </summary>
+        /// <param name="buffer"></param>
+        /// <param name="size"></param>
+        public ModeTable(IntPtr buffer, int size): base(buffer, size)
+        {
+            ushort len = Get16(0);
+            ushort index = ModeTableHeaderSize;
+
+            Pages = new List<ModePage>();
+
+            while (index < len && index < size)
+            {
+                int b0 = Get8(index) & 0x3f;
+
+                ModePage page ;
+                if (b0 == 0x05)
+                    page = new WriteParameterModePage(buffer, size, ref index) ;
+                else
+                    page = new ModePage(buffer, size, ref index);
+
+                Pages.Add(page);
+            }
+        }
+
+        /// <summary>
+        /// This property returns the total size of the raw mode table in bytes
+        /// </summary>
+        public ushort Size
+        {
+            get
+            {
+                ushort len = ModeTableHeaderSize;
+
+                foreach (ModePage p in Pages)
+                    len += p.Length;
+
+                return len;
+            }
+        }
+
+        /// <summary>
+        /// Format a mode table back into raw buffer for shipment down to a SCSI device.
+        /// </summary>
+        /// <param name="buffer">The buffer to receive the mode table</param>
+        public void Format(IntPtr buffer)
+        {
+            ushort s = (ushort)(Size - ModeTableHeaderSize);
+            Marshal.WriteByte(buffer, 0, (byte)((s >> 8) & 0xff));
+            Marshal.WriteByte(buffer, 1, (byte)(s & 0xff));
+
+            int offset = ModeTableHeaderSize;
+            foreach (ModePage p in Pages)
+            {
+                IntPtr dest = new IntPtr(buffer.ToInt32() + offset);
+                Marshal.Copy(p.PageData, 0, dest, p.Length);
+                offset += p.Length;
+            }
+        }
+    }
+}