/// <summary>Parse out a charset from a content type header.</summary>
/// <remarks>
/// Parse out a charset from a content type header. If the charset is not supported, returns null (so the default
/// will kick in.)
/// </remarks>
/// <param name="contentType">e.g. "text/html; charset=EUC-JP"</param>
/// <returns>"EUC-JP", or null if not found. Charset is trimmed and uppercased.</returns>
internal static String GetCharsetFromContentType(String contentType)
{
if (contentType == null)
{
return(null);
}
Match m = iText.IO.Util.StringUtil.Match(charsetPattern, contentType);
if (PortUtil.IsSuccessful(m))
{
String charset = iText.IO.Util.StringUtil.Group(m, 1).Trim();
charset = charset.Replace("charset=", "");
return(ValidateCharset(charset));
}
return(null);
}