/// <summary>
/// Reads a string value from the input stream.
/// </summary>
/// <param name="codeUnitCount">The length of the string.</param>
/// <returns>The value.</returns>
public string ReadString(uint codeUnitCount)
{
// although docs says that input parameter is "codeUnitCount", sample
// https://docs.microsoft.com/en-us/uwp/api/Windows.Storage.Streams.DataReader?view=winrt-19041
// shows that it is BYTE count, not CODEUNIT count.
// codepoint in UTF-8 can be encoded in anything from 1 to 6 bytes.
int length = (int)codeUnitCount;
VerifyRead(length);
var data = _buffer.GetSegment();
string result;
switch (UnicodeEncoding)
{
case UnicodeEncoding.Utf8:
result = Encoding.UTF8.GetString(data.Array !, data.Offset + _bufferPosition, length);
break;
case UnicodeEncoding.Utf16LE:
result = Encoding.Unicode.GetString(data.Array !, data.Offset + _bufferPosition, length * 2);
break;
case UnicodeEncoding.Utf16BE:
result = Encoding.BigEndianUnicode.GetString(data.Array !, data.Offset + _bufferPosition, length * 2);
break;
default:
throw new InvalidOperationException("Unsupported UnicodeEncoding value.");
}
_bufferPosition += length;
return(result);
}