/// <summary>
/// Normalize the string according to the given mode.
/// </summary>
/// <param name="src"></param>
/// <param name="mode"></param>
/// <returns></returns>
public static string Normalize(string src, UNormalizationMode mode)
{
if (string.IsNullOrEmpty(src))
{
return(string.Empty);
}
var length = src.Length + 10;
var resPtr = Marshal.AllocCoTaskMem(length * 2);
try
{
ErrorCode err;
var normalizer = GetNormalizer(mode);
var outLength = NativeMethods.unorm2_normalize(normalizer, src, src.Length, resPtr, length, out err);
if (err > 0 && err != ErrorCode.BUFFER_OVERFLOW_ERROR)
{
throw new Exception("Normalizer.Normalize() failed with code " + err);
}
if (outLength >= length)
{
Marshal.FreeCoTaskMem(resPtr);
length = outLength + 1; // allow room for the terminating NUL (FWR-505)
resPtr = Marshal.AllocCoTaskMem(length * 2);
outLength = NativeMethods.unorm2_normalize(normalizer, src, src.Length, resPtr, length, out err);
}
if (err > 0)
{
throw new Exception("Normalizer.Normalize() failed with code " + err);
}
var result = Marshal.PtrToStringUni(resPtr);
// Strip any garbage left over at the end of the string.
if (err == ErrorCode.STRING_NOT_TERMINATED_WARNING && result != null)
{
return(result.Substring(0, outLength));
}
return(result);
}
finally
{
Marshal.FreeCoTaskMem(resPtr);
}
}
