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106 lines
3.9 KiB
C#
106 lines
3.9 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : BlockLimits.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Device structures decoders.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Decodes SCSI's SSC block limits structures.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2016 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Text;
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namespace DiscImageChef.Decoders.SCSI.SSC
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{
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public static class BlockLimits
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{
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public struct BlockLimitsData
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{
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/// <summary>
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/// All blocks size must be multiple of 2^<cref name="granularity"/>
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/// </summary>
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public byte granularity;
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/// <summary>
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/// Maximum block length in bytes
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/// </summary>
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public uint maxBlockLen;
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/// <summary>
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/// Minimum block length in bytes
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/// </summary>
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public ushort minBlockLen;
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}
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public static BlockLimitsData? Decode(byte[] response)
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{
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if(response == null)
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return null;
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if(response.Length != 6)
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return null;
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BlockLimitsData dec = new BlockLimitsData();
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dec.granularity = (byte)(response[0] & 0x1F);
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dec.maxBlockLen = (uint)((response[1] << 16) + (response[2] << 8) + response[3]);
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dec.minBlockLen = (ushort)((response[4] << 8) + response[5]);
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return dec;
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}
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public static string Prettify(BlockLimitsData? decoded)
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{
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if(decoded == null)
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return null;
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StringBuilder sb = new StringBuilder();
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if(decoded.Value.maxBlockLen == decoded.Value.minBlockLen)
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sb.AppendFormat("Device's block size is fixed at {0} bytes", decoded.Value.minBlockLen).AppendLine();
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else
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{
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if(decoded.Value.maxBlockLen > 0)
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sb.AppendFormat("Device's maximum block size is {0} bytes", decoded.Value.maxBlockLen).AppendLine();
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else
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sb.AppendLine("Device does not specify a maximum block size");
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sb.AppendFormat("Device's minimum block size is {0} bytes", decoded.Value.minBlockLen).AppendLine();
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if(decoded.Value.granularity > 0)
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#pragma warning disable IDE0004 // Remove Unnecessary Cast
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sb.AppendFormat("Device's needs a block size granularity of 2^{0} ({1}) bytes", decoded.Value.granularity, Math.Pow(2, (double)decoded.Value.granularity)).AppendLine();
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#pragma warning restore IDE0004 // Remove Unnecessary Cast
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}
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return sb.ToString();
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}
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public static string Prettify(byte[] response)
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{
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return Prettify(Decode(response));
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}
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}
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}
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