public static Encoding DetectEncoding(byte[] data, DetectOption flags)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
return DetectEncoding(data, data.Length, flags);
}
public static Encoding DetectEncoding(byte[] data, int dataLength, DetectOption flags)
{
Encoding encoding2;
if (data == null)
{
throw new ArgumentNullException("data");
}
if (data.Length < dataLength)
{
throw new ArgumentException("data length is less than dataLength");
}
if (dataLength == 0)
{
return null;
}
if ((flags & DetectOption.TrySimpleDetectFirst) > DetectOption.Default)
{
Encoding encoding = SimpleDetectEncoding(data, dataLength);
if (encoding != null)
{
return encoding;
}
}
IMultiLanguage2 o = new CMultiLanguageClass() as IMultiLanguage2;
if (o == null)
{
return (((flags & DetectOption.TrySimpleDetectFirst) > DetectOption.Default) ? null : SimpleDetectEncoding(data, dataLength));
}
try
{
DetectEncodingInfo[] lpEncoding = new DetectEncodingInfo[1];
int length = lpEncoding.Length;
switch (o.DetectInputCodepage(((MLDETECTCP) flags) & MLDETECTCP.MLDETECTCP_MASK, 0, data, ref dataLength, lpEncoding, ref length))
{
case 0:
case 1:
if (length <= 0)
{
break;
}
return Encoding.GetEncoding((int) lpEncoding[0].nCodePage);
}
encoding2 = null;
}
finally
{
Marshal.FinalReleaseComObject(o);
}
return encoding2;
}
public static Encoding DetectEncoding(Stream stream, DetectOption flags)
{
Encoding encoding;
IMultiLanguage2 o = new CMultiLanguageClass() as IMultiLanguage2;
if (o == null)
{
byte[] buffer = new byte[4];
int dataLength = stream.Read(buffer, 0, buffer.Length);
return SimpleDetectEncoding(buffer, dataLength);
}
try
{
DetectEncodingInfo[] lpEncoding = new DetectEncodingInfo[1];
int length = lpEncoding.Length;
ComStream pstmIn = new ComStream(stream);
int errorCode = o.DetectCodepageInIStream(((MLDETECTCP) flags) & MLDETECTCP.MLDETECTCP_MASK, 0, pstmIn, lpEncoding, ref length);
switch (errorCode)
{
case 0:
case 1:
if (length <= 0)
{
break;
}
return Encoding.GetEncoding((int) lpEncoding[0].nCodePage);
default:
throw Marshal.GetExceptionForHR(errorCode);
}
encoding = null;
}
finally
{
Marshal.FinalReleaseComObject(o);
}
return encoding;
}