public MinimumStreamTargetFile(byte[] targetFileBytes, int maximumLength, CollectionFileType FileTypeTargets)
{
FilteredFileTypeTargets = FileTypeTargets;
_maximumLength = maximumLength;
MinimumTargetFileSequence = new byte[_maximumLength];
Array.Copy(targetFileBytes, MinimumTargetFileSequence, _maximumLength);
}
public bool IsFileExtensionCorrect(string extension, byte[] rawContent)
{
if (extension == null)
{
return(false);
}
CollectionFileType FileTypeTargets = new CollectionFileType(KnownFileSignatures.List.FindAll(
delegate(FileType ft)
{
return(Array.IndexOf(ft.Extension.Split(','), extension) >= 0);
}
));
if (FileTypeTargets.List.Count == 0)
{
return(false);
}
foreach (FileType FT in FileTypeTargets)
{
if (FT.Matches(rawContent))
{
return(true);
}
}
return(false);
}
public CollectionFileType GetMatchingFileTypes()
{
CollectionFileType AllFT_Matches = new CollectionFileType();
foreach (FileType FT in FilteredFileTypeTargets)
{
if (FT.Matches(MinimumTargetFileSequence))
{
AllFT_Matches.AddFileType(FT);
}
}
return(AllFT_Matches.Count == 0 ? new CollectionFileType(new[] { FileType.Unknown }) : AllFT_Matches);
}
public CollectionFileType GetFileExtension(byte[] rawContent)
{
CollectionFileType FileTypeTargets = new CollectionFileType();
int MaximumLengthForMatch = 0;
foreach (FileType CurrFileType in KnownFileSignatures)
{
int CurrFileSignatureLength = CurrFileType.GetMaxSignatureLength();
int MinResult = Math.Min(CurrFileSignatureLength, rawContent.Length);
if (MinResult == CurrFileSignatureLength)
{
FileTypeTargets.AddFileType(CurrFileType);
MaximumLengthForMatch = Math.Max(MaximumLengthForMatch, CurrFileSignatureLength);
}
}
MSTF = new MinimumStreamTargetFile(rawContent, MaximumLengthForMatch, FileTypeTargets);
return(MSTF.GetMatchingFileTypes());
}
public FileTypeTeller(CollectionFileType KnownFileSignatures)
{
this.KnownFileSignatures = KnownFileSignatures;
}
