static public byte[] Unpack(byte[] iBuf)
{
var PureMemStream = new MemoryStream(iBuf);
var MS = new QuickStream(PureMemStream);
if (MS.ReadString(6) != "JXSDA\x1a")
{
Fout("Data is not JXSDA packed data"); return(null);
}
var ubit = MS.ReadByte();
var pbit = MS.ReadByte();
var rest = MS.ReadByte();
var dsiz = MS.ReadInt();
var dict = new Dictionary <long, long>();
var restbank = new List <byte>();
P($"Unpack data: ubit:{ubit}; pbit:{pbit}; rest:{rest}; dsiz:{dsiz}");
for (int i = 0; i < dsiz; ++i)
{
switch (ubit)
{
case 64:
dict[i] = MS.ReadLong();
break;
case 32:
dict[i] = MS.ReadInt();
break;
case 16:
dict[i] = MS.ReadShort();
break;
default:
Fout($"Invalid ubit value {ubit} while reading dictionary");
return(null);
}
}
for (byte i = 0; i < rest; i++)
{
restbank.Add(MS.ReadByte());
}
var UPWrite = new MemoryStream();
var U = new QuickStream(UPWrite);
while (!MS.EOF)
{
try {
long value = 0;
switch (pbit)
{
case 32:
value = MS.ReadInt();
break;
case 16:
value = MS.ReadShort();
break;
case 8:
value = MS.ReadByte();
break;
default:
Fout($"Invalud pbit value {pbit} in reading bytes to unpack");
break;
}
if (!dict.ContainsKey(value))
{
Fout($"Undefined dictionary index {value}/{value:X2}");
return(null);
}
switch (ubit)
{
case 64:
U.WriteLong(dict[value]);
break;
case 32:
U.WriteInt((int)dict[value]);
break;
case 16:
U.WriteShort((short)dict[value]);
break;
default:
Fout($"Invalud ubit value ({ubit}) in writing bytes in unpacking");
return(null);
}
} catch (Exception e) {
Fout($".NET error unpacking: {e.Message}");
return(null);
}
}
foreach (byte b in restbank)
{
U.WriteByte(b);
}
var result = UPWrite.ToArray();
MS.Close();
U.Close();
return(result); // temp
}
