internal static string ReadBufferAsString(ArraySegment <byte> buffer, HttpContentHeaders headers)
{
Encoding encoding = (Encoding)null;
int preambleLength = -1;
string charSet = headers.ContentType?.CharSet;
if (charSet != null)
{
try
{
encoding = charSet.Length <= 2 || charSet[0] != '"' || charSet[charSet.Length - 1] != '"' ? Encoding.GetEncoding(charSet) : Encoding.GetEncoding(charSet.Substring(1, charSet.Length - 2));
preambleLength = HttpContent.GetPreambleLength(buffer, encoding);
}
catch (ArgumentException ex)
{
throw new InvalidOperationException(SR.net_http_content_invalid_charset, (Exception)ex);
}
}
if (encoding == null && !HttpContent.TryDetectEncoding(buffer, out encoding, out preambleLength))
{
encoding = HttpContent.DefaultStringEncoding;
preambleLength = 0;
}
return(encoding.GetString(buffer.Array, buffer.Offset + preambleLength, buffer.Count - preambleLength));
}