REFACTOR: Separate SCSI MODE decoders.

DiscImageChef.Decoders/SCSI/Modes/10.cs

@@ -0,0 +1,138 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : 10.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Device structures decoders.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Decodes SCSI MODE PAGE 10h: XOR control mode page.
+//
+// --[ 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.Text;
+
+namespace DiscImageChef.Decoders.SCSI
+{
+    public static partial class Modes
+    {
+        #region Mode Page 0x10: XOR control mode page
+        /// <summary>
+        /// XOR control mode page
+        /// Page code 0x10
+        /// 24 bytes in SBC-1, SBC-2
+        /// </summary>
+        public struct ModePage_10
+        {
+            /// <summary>
+            /// Parameters can be saved
+            /// </summary>
+            public bool PS;
+            /// <summary>
+            /// Disables XOR operations
+            /// </summary>
+            public bool XORDIS;
+            /// <summary>
+            /// Maximum transfer length in blocks for a XOR command
+            /// </summary>
+            public uint MaxXorWrite;
+            /// <summary>
+            /// Maximum regenerate length in blocks
+            /// </summary>
+            public uint MaxRegenSize;
+            /// <summary>
+            /// Maximum transfer length in blocks for READ during a rebuild
+            /// </summary>
+            public uint MaxRebuildRead;
+            /// <summary>
+            /// Minimum time in ms between READs during a rebuild
+            /// </summary>
+            public ushort RebuildDelay;
+        }
+
+        public static ModePage_10? DecodeModePage_10(byte[] pageResponse)
+        {
+            if(pageResponse == null) return null;
+
+            if((pageResponse[0] & 0x40) == 0x40) return null;
+
+            if((pageResponse[0] & 0x3F) != 0x10) return null;
+
+            if(pageResponse[1] + 2 != pageResponse.Length) return null;
+
+            if(pageResponse.Length < 24) return null;
+
+            ModePage_10 decoded = new ModePage_10();
+
+            decoded.PS |= (pageResponse[0] & 0x80) == 0x80;
+
+            decoded.XORDIS |= (pageResponse[2] & 0x02) == 0x02;
+            decoded.MaxXorWrite = (uint)((pageResponse[4] << 24) + (pageResponse[5] << 16) + (pageResponse[6] << 8) +
+                                         pageResponse[7]);
+            decoded.MaxRegenSize = (uint)((pageResponse[12] << 24) + (pageResponse[13] << 16) +
+                                          (pageResponse[14] << 8) + pageResponse[15]);
+            decoded.MaxRebuildRead = (uint)((pageResponse[16] << 24) + (pageResponse[17] << 16) +
+                                            (pageResponse[18] << 8) + pageResponse[19]);
+            decoded.RebuildDelay = (ushort)((pageResponse[22] << 8) + pageResponse[23]);
+
+            return decoded;
+        }
+
+        public static string PrettifyModePage_10(byte[] pageResponse)
+        {
+            return PrettifyModePage_10(DecodeModePage_10(pageResponse));
+        }
+
+        public static string PrettifyModePage_10(ModePage_10? modePage)
+        {
+            if(!modePage.HasValue) return null;
+
+            ModePage_10 page = modePage.Value;
+            StringBuilder sb = new StringBuilder();
+
+            sb.AppendLine("SCSI XOR control mode page:");
+
+            if(page.PS) sb.AppendLine("\tParameters can be saved");
+
+            if(page.XORDIS) sb.AppendLine("\tXOR operations are disabled");
+            else
+            {
+                if(page.MaxXorWrite > 0)
+                    sb.AppendFormat("\tDrive accepts a maximum of {0} blocks in a single XOR WRITE command",
+                                    page.MaxXorWrite).AppendLine();
+                if(page.MaxRegenSize > 0)
+                    sb.AppendFormat("\tDrive accepts a maximum of {0} blocks in a REGENERATE command",
+                                    page.MaxRegenSize).AppendLine();
+                if(page.MaxRebuildRead > 0)
+                    sb.AppendFormat("\tDrive accepts a maximum of {0} blocks in a READ command during rebuild",
+                                    page.MaxRebuildRead).AppendLine();
+                if(page.RebuildDelay > 0)
+                    sb.AppendFormat("\tDrive needs a minimum of {0} ms between READ commands during rebuild",
+                                    page.RebuildDelay).AppendLine();
+            }
+
+            return sb.ToString();
+        }
+        #endregion Mode Page 0x10: XOR control mode page
+    }
+}