public override int GetMaxCharCount(int byteCount)
{
if (byteCount < 0)
throw new ArgumentOutOfRangeException(nameof(byteCount), SR.ArgumentOutOfRange_NeedNonNegNum);
Contract.EndContractBlock();
// Just return length, SBCS stay the same length because they don't map to surrogate
long charCount = (long)byteCount;
// 1 to 1 for most characters. Only surrogates with fallbacks have less, unknown fallbacks could be longer.
if (DecoderFallback.MaxCharCount > 1)
charCount *= DecoderFallback.MaxCharCount;
if (charCount > 0x7fffffff)
throw new ArgumentOutOfRangeException(nameof(byteCount), SR.ArgumentOutOfRange_GetCharCountOverflow);
return (int)charCount;
}