private void EncodeCore(ref Writer writer, char *input, uint charsRemaining)
{
while (charsRemaining != 0)
{
int nextScalar = UnicodeHelpers.GetScalarValueFromUtf16(input, endOfString: (charsRemaining == 1));
if (UnicodeHelpers.IsSupplementaryCodePoint(nextScalar))
{
// Supplementary characters should always be encoded numerically.
WriteEncodedScalar(ref writer, (uint)nextScalar);
// We consume two UTF-16 characters for a single supplementary character.
input += 2;
charsRemaining -= 2;
}
else
{
// Otherwise, this was a BMP character.
input++;
charsRemaining--;
char c = (char)nextScalar;
if (IsCharacterAllowed(c))
{
writer.Write(c);
}
else
{
WriteEncodedScalar(ref writer, (uint)nextScalar);
}
}
}
}
private void GetScalarValueFromUtf16(string input, int expectedResult)
{
fixed(char *pInput = input)
{
Assert.Equal(expectedResult, UnicodeHelpers.GetScalarValueFromUtf16(pInput, endOfString: (input.Length == 1)));
}
}
//[Theory]
//[InlineData(1, "a", (int)'a')] // normal BMP char, end of string
//[InlineData(2, "ab", (int)'a')] // normal BMP char, not end of string
//[InlineData(3, "\uDFFF", UnicodeReplacementChar)] // trailing surrogate, end of string
//[InlineData(4, "\uDFFFx", UnicodeReplacementChar)] // trailing surrogate, not end of string
//[InlineData(5, "\uD800", UnicodeReplacementChar)] // leading surrogate, end of string
//[InlineData(6, "\uD800x", UnicodeReplacementChar)] // leading surrogate, not end of string, followed by non-surrogate
//[InlineData(7, "\uD800\uD800", UnicodeReplacementChar)] // leading surrogate, not end of string, followed by leading surrogate
//[InlineData(8, "\uD800\uDFFF", 0x103FF)] // leading surrogate, not end of string, followed by trailing surrogate
//public
private void GetScalarValueFromUtf16(int unused, string input, int expectedResult)
{
// The 'unused' parameter exists because the xunit runner can't distinguish
// the individual malformed data test cases from each other without this
// additional identifier.
fixed(char *pInput = input)
{
Assert.Equal(expectedResult, UnicodeHelpers.GetScalarValueFromUtf16(pInput, endOfString: (input.Length == 1)));
}
}