public static bool TryFormat(this char value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
if (formattingData.IsUtf16)
{
if (buffer.Length < 2)
{
bytesWritten = 0;
return(false);
}
buffer[0] = (byte)value;
buffer[1] = (byte)(value >> 8);
bytesWritten = 2;
return(true);
}
if (buffer.Length < 1)
{
bytesWritten = 0;
return(false);
}
// fast path for ASCII
if (value <= 127)
{
buffer[0] = (byte)value;
bytesWritten = 1;
return(true);
}
var encoded = new Utf8.FourBytes();
bytesWritten = Utf8.CharToUtf8(value, ref encoded);
if (buffer.Length < bytesWritten)
{
bytesWritten = 0;
return(false);
}
buffer[0] = encoded.B0;
if (bytesWritten > 1)
{
buffer[1] = encoded.B1;
}
if (bytesWritten > 2)
{
buffer[2] = encoded.B2;
}
if (bytesWritten > 3)
{
buffer[3] = encoded.B3;
}
return(true);
}
public static bool TryFormat(this string value, Span <byte> buffer, Format.Parsed format, FormattingData formattingData, out int bytesWritten)
{
var avaliableBytes = buffer.Length;
if (formattingData.IsUtf16)
{
bytesWritten = 0;
var avaliableChars = avaliableBytes >> 1;
for (int i = 0; i < value.Length; i++)
{
if (avaliableChars <= i)
{
bytesWritten = 0;
return(false);
}
ushort c = (ushort)value[i];
buffer[bytesWritten++] = (byte)c;
buffer[bytesWritten++] = (byte)(c >> 8);
}
return(true);
}
bytesWritten = 0;
for (int i = 0; i < value.Length; i++)
{
var c = value[i];
var encoded = new Utf8.FourBytes();
var bytes = Utf8.CharToUtf8(c, ref encoded);
if (bytesWritten + bytes > avaliableBytes)
{
bytesWritten = 0;
return(false);
}
buffer[bytesWritten] = encoded.B0;
if (bytes > 1)
{
buffer[+bytesWritten + 1] = encoded.B1;
}
if (bytes > 2)
{
buffer[+bytesWritten + 2] = encoded.B2;
}
if (bytes > 3)
{
buffer[+bytesWritten + 3] = encoded.B3;
}
bytesWritten += bytes;
}
return(true);
}