public static ModePage_0F?DecodeModePage_0F(byte[] pageResponse)
{
if ((pageResponse?[0] &0x40) == 0x40)
{
return(null);
}
if ((pageResponse?[0] &0x3F) != 0x0F)
{
return(null);
}
if (pageResponse[1] + 2 != pageResponse.Length)
{
return(null);
}
if (pageResponse.Length < 16)
{
return(null);
}
var decoded = new ModePage_0F();
decoded.PS |= (pageResponse[0] & 0x80) == 0x80;
decoded.DCE |= (pageResponse[2] & 0x80) == 0x80;
decoded.DCC |= (pageResponse[2] & 0x40) == 0x40;
decoded.DDE |= (pageResponse[3] & 0x80) == 0x80;
decoded.RED = (byte)((pageResponse[3] & 0x60) >> 5);
decoded.CompressionAlgo = (uint)((pageResponse[4] << 24) + (pageResponse[5] << 16) +
(pageResponse[6] << 8) + pageResponse[7]);
decoded.DecompressionAlgo = (uint)((pageResponse[8] << 24) + (pageResponse[9] << 16) +
(pageResponse[10] << 8) + pageResponse[11]);
return(decoded);
}
public static string PrettifyModePage_0F(ModePage_0F?modePage)
{
if (!modePage.HasValue)
{
return(null);
}
ModePage_0F page = modePage.Value;
StringBuilder sb = new StringBuilder();
sb.AppendLine("SCSI Data compression page:");
if (page.PS)
{
sb.AppendLine("\tParameters can be saved");
}
if (page.DCC)
{
sb.AppendLine("\tDrive supports data compression");
if (page.DCE)
{
sb.Append("\tData compression is enabled with ");
switch (page.CompressionAlgo)
{
case 3:
sb.AppendLine("IBM ALDC with 512 byte buffer");
break;
case 4:
sb.AppendLine("IBM ALDC with 1024 byte buffer");
break;
case 5:
sb.AppendLine("IBM ALDC with 2048 byte buffer");
break;
case 0x10:
sb.AppendLine("IBM IDRC");
break;
case 0x20:
sb.AppendLine("DCLZ");
break;
case 0xFF:
sb.AppendLine("an unregistered compression algorithm");
break;
default:
sb.AppendFormat("an unknown algorithm coded {0}", page.CompressionAlgo).AppendLine();
break;
}
}
if (page.DDE)
{
sb.AppendLine("\tData decompression is enabled");
if (page.DecompressionAlgo == 0)
{
sb.AppendLine("\tLast data read was uncompressed");
}
else
{
sb.Append("\tLast data read was compressed with ");
switch (page.CompressionAlgo)
{
case 3:
sb.AppendLine("IBM ALDC with 512 byte buffer");
break;
case 4:
sb.AppendLine("IBM ALDC with 1024 byte buffer");
break;
case 5:
sb.AppendLine("IBM ALDC with 2048 byte buffer");
break;
case 0x10:
sb.AppendLine("IBM IDRC");
break;
case 0x20:
sb.AppendLine("DCLZ");
break;
case 0xFF:
sb.AppendLine("an unregistered compression algorithm");
break;
default:
sb.AppendFormat("an unknown algorithm coded {0}", page.CompressionAlgo).AppendLine();
break;
}
}
}
sb.AppendFormat("\tReport exception on compression is set to {0}", page.RED).AppendLine();
}
else
{
sb.AppendLine("\tDrive does not support data compression");
}
return(sb.ToString());
}
