/// <summary>
/// Performs basic validation on the file being analyzed by this <see cref="FileAnalyzer" />.
/// </summary>
/// <returns>A <see cref="FileValidationResult" /> object representing the result of validation.</returns>
public override FileValidationResult Validate()
{
try
{
using (ExcelApp app = new ExcelApp())
{
app.Open(File);
}
return(FileValidationResult.Pass);
}
catch (COMException ex)
{
LogWarn("File failed to open: " + ex.Message);
return(FileValidationResult.Fail(ex.Message));
}
}
/// <summary>
/// Performs basic validation on the file being analyzed by this <see cref="FileAnalyzer" />.
/// </summary>
/// <returns>A <see cref="FileValidationResult" /> object representing the result of validation.</returns>
public override FileValidationResult Validate()
{
try
{
LogDebug($"Loading TIF image: {File.Name}");
using (Image tiff = Image.FromFile(File.FullName))
{
return(FileValidationResult.Pass);
}
}
catch (OutOfMemoryException)
{
LogWarn("Unable to load image.");
return(FileValidationResult.Fail("The file is not a valid TIF document."));
}
}
/// <summary>
/// Performs basic validation on the file being analyzed by this <see cref="FileAnalyzer" />.
/// </summary>
/// <returns>A <see cref="FileValidationResult" /> object representing the result of validation.</returns>
public override FileValidationResult Validate()
{
string firstLine = System.IO.File.ReadLines(File.FullName).FirstOrDefault();
// If the first line is empty, the file is invalid.
if (string.IsNullOrEmpty(firstLine))
{
return(FileValidationResult.Fail("Empty file."));
}
// A well-formed PDF must start with this text.
if (!firstLine.StartsWith("%PDF-", StringComparison.OrdinalIgnoreCase))
{
return(FileValidationResult.Fail("Malformed first line."));
}
// There should be an EOF flag at the end.
string lastLine = System.IO.File.ReadLines(File.FullName).Last();
if (lastLine != "%%EOF")
{
return(FileValidationResult.Fail("File did not include EOF flag."));
}
// Finally, use the PDF library to load the file and ensure there were no other problems.
try
{
LogDebug($"Loading PDF file: {File.Name}");
using (PdfDocument doc = PdfReader.Open(File.FullName, PdfDocumentOpenMode.ReadOnly))
{
return(FileValidationResult.Pass);
}
}
catch (Exception ex) when(ex is PdfSharpException || ex is InvalidOperationException)
{
LogWarn("File failed to open: " + ex.Message);
return(FileValidationResult.Fail(ex.Message));
}
}
