// TODO: Validate constructors if we decide to keep this class
public Utf8EncodedCodePoint(char character) : this()
{
if (char.IsSurrogate(character))
{
throw new ArgumentOutOfRangeException("character", "Surrogate characters are not allowed");
}
UnicodeCodePoint codePoint = (UnicodeCodePoint)(uint)character;
unsafe
{
fixed(byte *encodedData = &_byte0)
{
Span <byte> buffer = new Span <byte>(encodedData, 4);
if (!Utf8Encoder.TryEncodeCodePoint(codePoint, buffer, out _length))
{
// TODO: Change exception type
throw new Exception("Internal error: this should never happen as codePoint is within acceptable range and is not surrogate");
}
}
}
}
// TODO: This should return Utf16CodeUnits which should wrap byte[]/Span<byte>, same for other encoders
private static byte[] GetUtf8BytesFromString(string s)
{
int len = 0;
for (int i = 0; i < s.Length; /* intentionally no increment */)
{
UnicodeCodePoint codePoint;
int encodedChars;
if (!Utf16LittleEndianEncoder.TryDecodeCodePointFromString(s, i, out codePoint, out encodedChars))
{
throw new ArgumentException("s", "Invalid surrogate pair in the string.");
}
if (encodedChars <= 0)
{
// TODO: Fix exception type
throw new Exception("internal error");
}
int encodedBytes = Utf8Encoder.GetNumberOfEncodedBytes(codePoint);
if (encodedBytes == 0)
{
// TODO: Fix exception type
throw new Exception("Internal error: Utf16Decoder somehow got CodePoint out of range");
}
len += encodedBytes;
i += encodedChars;
}
byte[] bytes = new byte[len];
unsafe
{
fixed(byte *array_pinned = bytes)
{
Span <byte> p = new Span <byte>(array_pinned, len);
for (int i = 0; i < s.Length; /* intentionally no increment */)
{
UnicodeCodePoint codePoint;
int encodedChars;
if (Utf16LittleEndianEncoder.TryDecodeCodePointFromString(s, i, out codePoint, out encodedChars))
{
i += encodedChars;
int encodedBytes;
if (Utf8Encoder.TryEncodeCodePoint(codePoint, p, out encodedBytes))
{
p = p.Slice(encodedBytes);
}
else
{
// TODO: Fix exception type
throw new Exception("Internal error: Utf16Decoder somehow got CodePoint out of range or the buffer is too small");
}
}
else
{
// TODO: Fix exception type
throw new Exception("Internal error: we did pre-validation of the string, nothing should go wrong");
}
}
}
}
return(bytes);
}
