private void WriteFieldNameOrString(bool isFieldName, ReadOnlySpan <byte> utf8String)
{
// String dictionary encoding is currently performed only for field names.
// This would be changed later, so that the writer can control which strings need to be encoded.
this.JsonObjectState.RegisterToken(isFieldName ? JsonTokenType.FieldName : JsonTokenType.String);
if (JsonBinaryEncoding.TryGetEncodedStringTypeMarker(
utf8String,
this.JsonObjectState.CurrentTokenType == JsonTokenType.FieldName ? this.jsonStringDictionary : null,
out JsonBinaryEncoding.MultiByteTypeMarker multiByteTypeMarker))
{
switch (multiByteTypeMarker.Length)
{
case 1:
this.binaryWriter.Write(multiByteTypeMarker.One);
break;
case 2:
this.binaryWriter.Write(multiByteTypeMarker.One);
this.binaryWriter.Write(multiByteTypeMarker.Two);
break;
default:
throw new ArgumentOutOfRangeException($"Unable to serialize a {nameof(JsonBinaryEncoding.MultiByteTypeMarker)} of length: {multiByteTypeMarker.Length}");
}
}
else
{
// See if the string length can be encoded into a single type marker
byte typeMarker = JsonBinaryEncoding.TypeMarker.GetEncodedStringLengthTypeMarker(utf8String.Length);
if (JsonBinaryEncoding.TypeMarker.IsValid(typeMarker))
{
this.binaryWriter.Write(typeMarker);
}
else
{
// Just write the type marker and the corresponding length
if (utf8String.Length < byte.MaxValue)
{
this.binaryWriter.Write(JsonBinaryEncoding.TypeMarker.String1ByteLength);
this.binaryWriter.Write((byte)utf8String.Length);
}
else if (utf8String.Length < ushort.MaxValue)
{
this.binaryWriter.Write(JsonBinaryEncoding.TypeMarker.String2ByteLength);
this.binaryWriter.Write((ushort)utf8String.Length);
}
else
{
// (utf8String.Length < uint.MaxValue)
this.binaryWriter.Write(JsonBinaryEncoding.TypeMarker.String4ByteLength);
this.binaryWriter.Write((uint)utf8String.Length);
}
}
// Finally write the string itself.
this.binaryWriter.Write(utf8String);
}
if (!isFieldName)
{
// If we just wrote a string then increment the count (we don't increment for field names, since we need to wait for the corresponding property value).
this.bufferedContexts.Peek().Count++;
}
}