/// <summary>
/// If the content of this tag is a Text field, returns the content as a <see cref="string"/>, otherwise returns null.
/// </summary>
/// <returns>This tag's field if it's text, otherwise null.</returns>
internal string AsString()
{
if (!FrameHeader.StartsWith("T")) return null;
string content;
Encoding enc;
switch (RawContent[0])
{
case 0:
try
{
enc = Encoding.GetEncoding("iso-8859-1");
}
catch (Exception)
{
enc = new Latin1Encoding(); //fallback in case Latin-1 isn't available
}
content = enc.GetString(RawContent, 1, RawContent.Length - 2);
break;
case 1:
enc = Encoding.Unicode;
if (RawContent[1] != 0xFF && RawContent[2] != 0xFE) return null;
content = enc.GetString(RawContent, 3, RawContent.Length - 5);
break;
case 2:
enc = new UnicodeEncoding(bigEndian: true, byteOrderMark: false);
//if (FrameContent[1] != 0xFE && FrameContent[2] != 0xFF) return null;
content = enc.GetString(RawContent, 1, RawContent.Length - 3);
break;
case 3:
enc = Encoding.UTF8;
content = enc.GetString(RawContent, 1, RawContent.Length - 2);
break;
default:
throw new InvalidOperationException();
}
return content;
}
