// TODO: Utf8Reader currently causes allocations
public static bool TryReadSingle(ref ReadOnlySpan <byte> remaining, out float result, char standardFormat)
{
result = default;
switch (GetTokenType(ref remaining))
{
case JsonTokenType.Number:
if (!Utf8Reader.TryReadSingle(ref remaining, out result, JsonSerializer.FloatFormat.Symbol))
{
return(false);
}
return(true);
case JsonTokenType.String:
remaining = remaining.Slice(1);
if (!Utf8Reader.TryReadSingle(ref remaining, out result, standardFormat))
{
return(false);
}
if (remaining.Length == 0 || remaining[0] != '"')
{
return(false);
}
remaining = remaining.Slice(1);
return(true);
}
return(false);
}
public static bool TryReadSingle(ref ReadOnlySpan <byte> remaining, out float result, char standardFormat)
{
result = default;
if (standardFormat != '\0')
{
if (!TryReadUtf8Bytes(ref remaining, out var bytes))
{
return(false);
}
return(Utf8Reader.TryReadSingle(ref bytes, out result, standardFormat));
}
switch (GetTokenType(ref remaining))
{
case EtfTokenType.Float:
// TODO: Untested
var bytes = remaining.Slice(1, 31);
remaining.Slice(32);
return(Utf8Reader.TryReadSingle(ref bytes, out result, 'g'));
case EtfTokenType.NewFloat:
{
// TODO: Untested, does Discord have any endpoints that accept floats?
if (remaining.Length < 8)
{
return(false);
}
remaining = remaining.Slice(1);
Span <double> dst = stackalloc double[1];
var dstBytes = MemoryMarshal.AsBytes(dst);
// Swap endian
dstBytes[0] = remaining[7];
dstBytes[1] = remaining[6];
dstBytes[2] = remaining[5];
dstBytes[3] = remaining[4];
dstBytes[4] = remaining[3];
dstBytes[5] = remaining[2];
dstBytes[6] = remaining[1];
dstBytes[7] = remaining[0];
result = (float)dst[0];
remaining = remaining.Slice(8);
return(true);
}
default:
return(false);
}
}