internal static string Encode5987(string input)
{
StringBuilder stringBuilder = StringBuilderCache.Acquire(16);
byte[] numArray = ArrayPool <byte> .Shared.Rent(Encoding.UTF8.GetMaxByteCount(input.Length));
int bytes = Encoding.UTF8.GetBytes(input, 0, input.Length, numArray, 0);
stringBuilder.Append("utf-8''");
for (int index = 0; index < bytes; ++index)
{
byte c = numArray[index];
if (c > (byte)127)
{
HeaderUtilities.AddHexEscaped(c, stringBuilder);
}
else if (!HttpRuleParser.IsTokenChar((char)c) || c == (byte)42 || (c == (byte)39 || c == (byte)37))
{
HeaderUtilities.AddHexEscaped(c, stringBuilder);
}
else
{
stringBuilder.Append((char)c);
}
}
Array.Clear((Array)numArray, 0, bytes);
ArrayPool <byte> .Shared.Return(numArray, false);
return(StringBuilderCache.GetStringAndRelease(stringBuilder));
}