internal static string NormalizeString(string value, int offset, int length)
{
if (length >= 2 && length <= 32)
{
int num = MimeData.HashValue(value, offset, length);
int num2 = MimeData.valueHashTable[num];
if (num2 > 0)
{
string value2;
for (;;)
{
value2 = MimeData.values[num2].value;
if (length == value2.Length && string.Compare(value2, 0, value, offset, length, StringComparison.OrdinalIgnoreCase) == 0)
{
break;
}
num2++;
if ((int)MimeData.values[num2].hash != num)
{
goto IL_5E;
}
}
return(value2);
}
}
IL_5E:
return(value.Substring(offset, length).ToLowerInvariant());
}
internal static string NormalizeString(byte[] value, int offset, int length, bool allowUTF8)
{
if (length >= 2 && length <= 32)
{
int num = MimeData.HashValue(value, offset, length);
int num2 = MimeData.valueHashTable[num];
if (num2 > 0)
{
string value2;
for (;;)
{
value2 = MimeData.values[num2].value;
if (ByteString.EqualsI(value2, value, offset, length, allowUTF8))
{
break;
}
num2++;
if ((int)MimeData.values[num2].hash != num)
{
goto IL_54;
}
}
return(value2);
}
}
IL_54:
return(ByteString.BytesToString(value, offset, length, allowUTF8).ToLowerInvariant());
}
internal static string NormalizeString(string value)
{
if (value.Length >= 2 && value.Length <= 32)
{
int num = MimeData.HashValue(value);
int num2 = MimeData.valueHashTable[num];
if (num2 > 0)
{
string value2;
for (;;)
{
value2 = MimeData.values[num2].value;
if (value.Length == value2.Length && value.Equals(value2, StringComparison.OrdinalIgnoreCase))
{
break;
}
num2++;
if ((int)MimeData.values[num2].hash != num)
{
goto IL_68;
}
}
return(value2);
}
}
IL_68:
return(value.ToLowerInvariant());
}
