public bool TryMatchFormat(string fileName,
byte[] header,
Encoding encoding,
out ILogFileFormat format,
out Certainty certainty)
{
try
{
if (_inner == null)
{
format = null;
certainty = Certainty.Sure;
return(false);
}
return(_inner.TryMatchFormat(fileName, header, encoding, out format, out certainty));
}
catch (Exception e)
{
Log.ErrorFormat("Caught unexpected exception: {0}", e);
format = null;
certainty = Certainty.Uncertain;
return(false);
}
}
public bool TryMatchFormat(string fileName, byte[] initialContent, out ILogFileFormat format)
{
try
{
return(_inner.TryMatchFormat(fileName, initialContent, out format));
}
catch (Exception e)
{
Log.ErrorFormat("Caught unexpected exception: {0}", e);
format = null;
return(false);
}
}
private ILogFileFormat TryFindFormat(FileStream stream)
{
var pos = stream.Position;
const int maxHeaderLength = 512;
var length = Math.Min(maxHeaderLength, stream.Length - pos);
var header = new byte[length];
stream.Read(header, 0, header.Length);
ILogFileFormat format = null;
_formatMatcher?.TryMatchFormat(_fullFilename, header, out format);
if (format == null && length == maxHeaderLength)
{
return(LogFileFormats.GenericText);
}
return(format);
}
private ILogFileFormat TryFindFormatOf(string fileName,
Stream stream,
Encoding encoding,
out Certainty certainty)
{
stream.Position = 0;
const int maxHeaderLength = 512;
var length = Math.Min(maxHeaderLength, stream.Length);
var header = new byte[length];
stream.Read(header, offset: 0, header.Length);
_formatMatcher.TryMatchFormat(fileName, header, encoding, out var format, out certainty);
if (format != null)
{
return(format);
}
certainty = header.Length >= maxHeaderLength
? Certainty.Sure
: Certainty.Uncertain;
return(LogFileFormats.GenericText);
}