private bool TryGetHtmlCharsetFromMetaTag(uint maxBytesToSearch, out Charset htmlBodyCharset)
{
htmlBodyCharset = null;
using (MemoryStream memoryStream = this.LoadHtmlBodyInMemory())
{
memoryStream.Position = 0L;
Charset itemMimeCharset = ConvertUtils.GetItemMimeCharset(this.coreItem.PropertyBag);
using (HtmlReader htmlReader = new HtmlReader(memoryStream, itemMimeCharset.GetEncoding()))
{
while (htmlReader.ReadNextToken())
{
if ((long)htmlReader.CurrentOffset > (long)((ulong)maxBytesToSearch))
{
return(false);
}
if (htmlReader.TokenKind == HtmlTokenKind.EmptyElementTag && htmlReader.TagId == HtmlTagId.Meta)
{
bool flag = false;
bool flag2 = false;
string text = string.Empty;
HtmlAttributeReader attributeReader = htmlReader.AttributeReader;
while (!flag && attributeReader.ReadNext())
{
if (attributeReader.Id == HtmlAttributeId.Charset && attributeReader.HasValue)
{
text = attributeReader.ReadValue();
flag = true;
}
else if (attributeReader.Id == HtmlAttributeId.Content && attributeReader.HasValue)
{
text = attributeReader.ReadValue();
if (flag2)
{
flag = true;
}
}
else if (attributeReader.Id == HtmlAttributeId.HttpEquiv && attributeReader.HasValue)
{
string a = attributeReader.ReadValue();
if (string.Equals(a, "content-type", StringComparison.OrdinalIgnoreCase) || string.Equals(a, "charset", StringComparison.OrdinalIgnoreCase))
{
flag2 = true;
if (!string.IsNullOrEmpty(text))
{
flag = true;
}
}
}
}
if (flag)
{
text = HtmlReader.CharsetFromString(text, flag2);
if (!string.IsNullOrEmpty(text) && Charset.TryGetCharset(text, out htmlBodyCharset))
{
return(true);
}
return(false);
}
}
}
}
}
return(false);
}