public int Int(MPObject mpo)
{
byte fmt;
byte[] nb;
switch (mpo.Value)
{
case sbyte n:
fmt = MPFormats.Int8;
nb = new[] { unchecked ((byte)n) };
break;
case byte n:
fmt = MPFormats.UInt8;
nb = new[] { n };
break;
case short n:
fmt = MPFormats.Int16;
nb = BitConverter.GetBytes(n);
break;
case ushort n:
fmt = MPFormats.UInt16;
nb = BitConverter.GetBytes(n);
break;
case int n:
fmt = MPFormats.Int32;
nb = BitConverter.GetBytes(n);
break;
case uint n:
fmt = MPFormats.UInt32;
nb = BitConverter.GetBytes(n);
break;
case long n:
fmt = MPFormats.Int64;
nb = BitConverter.GetBytes(n);
break;
case ulong n:
fmt = MPFormats.UInt64;
nb = BitConverter.GetBytes(n);
break;
default:
throw new Exception("Can't emit byte stream for MPO type: " + mpo.Type);
}
_stream.WriteByte(fmt);
_stream.Write(nb, 0, nb.Length);
return(nb.Length);
}
public virtual object Decode(Type type, MPObject mpo)
{
foreach (var c in Converters)
{
if (c.CanDecode(type))
{
return(c.Decode(this, type, mpo));
}
}
throw new MPConversionException(type, mpo,
message: $"found no matching decoder for target type [{type.FullName}]");
}
public int Map(MPObject mpo)
{
var map = (IDictionary <MPObject, MPObject>)mpo.Value;
var mapCount = map.Count;
byte fmt;
byte[] nb;
if (mapCount <= 15)
{
fmt = unchecked ((byte)(mapCount + MPFormats.FixMap.start));
nb = NoBytes;
}
else if (mapCount < ushort.MaxValue)
{
fmt = MPFormats.Map16;
nb = BitConverter.GetBytes((ushort)mapCount);
}
// This should be uint.MaxValue but Dictionary can't store that
// many elements or at least can't give us a count that high
else if (mapCount < int.MaxValue)
{
fmt = MPFormats.Map32;
nb = BitConverter.GetBytes((uint)mapCount);
}
else
{
throw new Exception("Can't emit byte stream for MPO type: " + mpo.Type);
}
// Ensure network byte order
if (mapCount > 16 && BitConverter.IsLittleEndian)
{
System.Array.Reverse(nb);
}
_stream.WriteByte(fmt);
_stream.Write(nb, 0, nb.Length);
int written = 1 + nb.Length;
foreach (var kv in map)
{
written += Emit(kv.Key);
written += Emit(kv.Value);
}
return(written);
}
public int Float(MPObject mpo)
{
switch (mpo.Value)
{
case float f:
var fb = BitConverter.GetBytes(f);
_stream.WriteByte(MPFormats.Float32);
_stream.Write(fb, 0, fb.Length);
return(1 + fb.Length);
case double d:
var db = BitConverter.GetBytes(d);
_stream.WriteByte(MPFormats.Float64);
_stream.Write(db, 0, db.Length);
return(1 + db.Length);
}
throw new Exception("Can't emit byte stream for MPO type: " + mpo.Type);
}
public int Str(MPObject mpo)
{
var s = (string)mpo.Value;
var b = Encoding.UTF8.GetBytes(s);
byte fmt;
byte[] nb;
if (b.Length <= byte.MaxValue)
{
fmt = MPFormats.Str8;
nb = new byte[] { unchecked ((byte)b.Length) };
}
else if (b.Length <= ushort.MaxValue)
{
fmt = MPFormats.Str16;
nb = BitConverter.GetBytes((ushort)b.Length);
}
else if (b.LongLength <= uint.MaxValue)
{
fmt = MPFormats.Str32;
nb = BitConverter.GetBytes((uint)b.Length);
}
else
{
throw new Exception("Can't emit byte stream for MPO type: " + mpo.Type);
}
// Ensure network byte order
if (b.Length > byte.MaxValue && BitConverter.IsLittleEndian)
{
System.Array.Reverse(nb);
}
_stream.WriteByte(fmt);
_stream.Write(nb, 0, nb.Length);
_stream.Write(b, 0, b.Length);
return(1 + nb.Length + b.Length);
}
public int Emit(MPObject mpo)
{
System.Array.Clear(_bytes, 0, _bytes.Length);
switch (mpo.Type)
{
case MPType.Nil:
_bytes[0] = MPFormats.Nil;
_stream.Write(_bytes, 0, 1);
return(1);
case MPType.Boolean:
_bytes[0] = (byte)(((bool)mpo.Value) ? MPFormats.True : MPFormats.False);
_stream.Write(_bytes, 0, 1);
return(1);
case MPType.Integer:
return(Int(mpo));
case MPType.Float:
return(Float(mpo));
case MPType.Binary:
return(Bin(mpo));
case MPType.String:
return(Str(mpo));
case MPType.Array:
return(Array(mpo));
case MPType.Map:
return(Map(mpo));
case MPType.Ext:
return(Ext(mpo));
}
throw new Exception("Can't emit byte stream for MPO type: " + mpo.Type);
}
public int Ext(MPObject mpo)
{
var ext = (MPExt)mpo.Value;
var extDataLen = ext.Data.Length;
byte fmt;
byte[] nb;
if (extDataLen < byte.MaxValue)
{
nb = NoBytes;
switch (extDataLen)
{
// Handle the special cases for specific data lengths...
case 1: fmt = MPFormats.FixExt1; break;
case 2: fmt = MPFormats.FixExt2; break;
case 4: fmt = MPFormats.FixExt4; break;
case 8: fmt = MPFormats.FixExt8; break;
case 16: fmt = MPFormats.FixExt16; break;
// ...then default to the general var-length case
default:
fmt = MPFormats.Ext8;
nb = new[] { unchecked ((byte)extDataLen) };
break;
}
}
else if (extDataLen < ushort.MaxValue)
{
fmt = MPFormats.Ext16;
nb = BitConverter.GetBytes((ushort)extDataLen);
}
// This should be uint.MaxValue but Span<> can't store that
// many elements or at least can't give us a count that high
else if (extDataLen < int.MaxValue)
{
fmt = MPFormats.Ext32;
nb = BitConverter.GetBytes((uint)extDataLen);
}
else
{
throw new Exception("Can't emit byte stream for MPO type: " + mpo.Type);
}
// Ensure network byte order
if (extDataLen >= byte.MaxValue && BitConverter.IsLittleEndian)
{
System.Array.Reverse(nb);
}
_stream.WriteByte(fmt);
_stream.Write(nb, 0, nb.Length);
_stream.WriteByte((byte)ext.Type);
int written = 1 + nb.Length + 1;
_stream.Write(ext.Data.ToArray(), 0, extDataLen);
return(written);
}