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 FileTypeTeller()
{
List <FileTypeSpecifications> JSONFileSpecs = JsonSerializer.Deserialize <List <FileTypeSpecifications> >(Resources.FILESIGNATURES_JSON);
foreach (var spec in JSONFileSpecs)
{
List <MatchByteSegment> OneFileByteSegments = new List <MatchByteSegment>();
foreach (SegmentAndOffset SegByteOff in spec.SegmentBytesAndOffset)
{
OneFileByteSegments.Add(new MatchByteSegment(
Array.ConvertAll(SegByteOff.SegmentStringByte.Trim().Split(' '), byteAsString => Convert.ToByte(byteAsString, 16)), SegByteOff.Offset)
);
}
KnownFileSignatures.AddFileType(new FileType(string.Join(",", spec.FileTypeDescriptions), string.Join(",", spec.Extensions),
new FuzzyFileTypeMatcher(OneFileByteSegments)));
}
//KnownFileSignatures.SortListBySegmentBytesLengthDescendently();
}
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());
}