internal static SupportedFileFormat DetectFileSchema(string filePath)
{
if (!string.IsNullOrEmpty(filePath))
{
if (filePath.EndsWith(SR.GetString("MainFrm_FileEtl"), StringComparison.OrdinalIgnoreCase))
{
return(SupportedFileFormat.EtlBinary);
}
if (filePath.EndsWith(SR.GetString("PJ_Extension"), StringComparison.OrdinalIgnoreCase))
{
return(SupportedFileFormat.STVProjectFile);
}
FileStream fileStream = null;
char[] array = new char[8192];
try
{
fileStream = Utilities.CreateFileStreamHelper(filePath);
Utilities.SeekFileStreamHelper(fileStream, 0L, SeekOrigin.Begin);
Utilities.CreateStreamReaderHelper(fileStream).Read(array, 0, array.Length);
}
catch (IOException)
{
return(SupportedFileFormat.UnknownFormat);
}
finally
{
Utilities.CloseStreamWithoutException(fileStream, isFlushStream: false);
}
string text = new string(array);
text = text.Trim(' ', '\0', '\t', '\n');
if (string.IsNullOrEmpty(text))
{
return(SupportedFileFormat.E2ETraceEventSchema);
}
int num = text.IndexOf(crimsonSchemaTag, StringComparison.Ordinal);
int num2 = text.IndexOf(e2eSchemaTag, StringComparison.Ordinal);
if (num != -1 && num2 == -1)
{
return(SupportedFileFormat.CrimsonSchema);
}
if (num == -1 && num2 != -1)
{
return(SupportedFileFormat.E2ETraceEventSchema);
}
if (num != -1 && num2 == -1 && num < num2)
{
return(SupportedFileFormat.CrimsonSchema);
}
if (num != -1 && num2 == -1 && num > num2)
{
return(SupportedFileFormat.E2ETraceEventSchema);
}
}
return(SupportedFileFormat.NotSupported);
}