static public byte[] Pack(byte[] ibuf)
{
P($"Request to pack {ibuf.Length}");
if (ibuf.Length < 1024)
{
return(cpy(ibuf));
}
var d64 = new List <long>();
var d32 = new List <int>();
var d16 = new List <short>();
var bank = new BlitzBank(ibuf, BlitzEndian.Little, true);
byte mod64;
byte mod32;
byte mod16;
// 64 bit
P("Creating Dictionary for 64 bit");
for (int i = 0; i < ibuf.Length - 8; i += 8)
{
var p = bank.PeekLong(i);
if (!d64.Contains(p))
{
d64.Add(p);
}
}
mod64 = (byte)(ibuf.Length % 8);
P($"64 bit result (Entries {d64.Count}; Full: {ibuf.Length} Div: {(int)(ibuf.Length / 8)}; Mod: {mod64}; Pb: {needbit(d64.Count)} ");
// 32 bit
P("Creating Dictionary for 32 bit");
for (int i = 0; i < ibuf.Length - 4; i += 4)
{
var p = bank.PeekInt(i);
if (!d32.Contains(p))
{
d32.Add(p);
}
}
mod32 = (byte)(ibuf.Length % 4);
P($"32 bit result (Entries {d32.Count}; Full: {ibuf.Length} Div: {(int)(ibuf.Length / 4)}; Mod: {mod32}; Pb: {needbit(d32.Count)} ");
// 16 bit
P("Creating Dictionary for 16 bit");
for (int i = 0; i < ibuf.Length - 2; i += 2)
{
var p = bank.PeekShort(i);
if (!d16.Contains(p))
{
d16.Add(p);
}
}
mod16 = (byte)(ibuf.Length % 2);
P($"16 bit result (Entries {d16.Count}; Full: {ibuf.Length} Div: {(int)(ibuf.Length / 2)}; Mod: {mod16}; Pb: {needbit(d16.Count)} ");
byte ubit = 64;
byte pbit = 64;
byte uinc = 8;
//byte pinc = 8;
int dsiz = 0;
var rat64 = Ratio(d64.Count, ibuf.Length / 8);
var rat32 = Ratio(d32.Count, ibuf.Length / 4);
var rat16 = Ratio(d16.Count, ibuf.Length / 2);
byte rest = 0;
P($"Ratio 64:{rat64}; 32:{rat32}; 16:{rat16}");
if (rat16 < rat64 && rat16 < rat32 && needbit(d16.Count) < 16)
{
ubit = 16; pbit = needbit(d16.Count); dsiz = (int)d16.Count; rest = mod16; uinc = 2;
}
else if (rat32 < rat64 && needbit(d32.Count) < 32)
{
ubit = 32; pbit = needbit(d32.Count); dsiz = (int)d32.Count; rest = mod32; uinc = 4;
}
P($"Chosen: {ubit} => {pbit}");
if (pbit == 64 || pbit == ubit)
{
P("Packing not possible, so let's get outta here!");
return(cpy(ibuf));
}
var Dict = new Dictionary <long, long>();
var PureMemStream = new MemoryStream();
var MS = new QuickStream(PureMemStream);
MS.WriteString("JXSDA\x1a", true);
MS.WriteByte(ubit);
MS.WriteByte(pbit);
MS.WriteByte(rest);
MS.WriteInt(dsiz);
for (int i = 0; i < dsiz; i++)
{
switch (ubit)
{
case 32:
Dict[d32[i]] = i;
MS.WriteInt(d32[i]);
break;
case 64:
Dict[d64[i]] = i;
MS.WriteLong(d64[i]);
break;
case 16:
P($"Dict create {i}/{dsiz}/{d16.Count}");
Dict[d16[i]] = i;
MS.WriteLong(d16[i]);
break;
default:
throw new Exception("Unknown bit setting in creating dictionary (bug?)");
}
}
for (int p = ibuf.Length - rest; p < ibuf.Length; p++)
{
MS.WriteByte(ibuf[p]);
}
for (int p = 0; p < ibuf.Length - uinc; p += uinc)
{
long value;
switch (ubit)
{
case 64:
value = bank.PeekLong(p);
break;
case 32:
value = bank.PeekInt(p);
break;
case 16:
value = bank.PeekShort(p);
break;
default:
throw new Exception("Unknown bit setting in reading bytes to pack (bug?)");
}
switch (pbit)
{
case 64:
throw new Exception("64 bit output invalid! (bug?)");
case 32:
MS.WriteInt((int)Dict[value]);
break;
case 16:
MS.WriteShort((short)Dict[value]);
break;
case 8:
MS.WriteByte((byte)Dict[value]);
break;
default:
throw new Exception("Unknown bit setting in writing bytes to pack (bug?)");
}
}
var ret = PureMemStream.ToArray();
MS.Close();
return(ret); // temp
}