static FileTypeDetector()
{
_root = new ByteTrie <FileType>();
_root.SetDefaultValue(FileType.Unknown);
// https://en.wikipedia.org/wiki/List_of_file_signatures
_root.AddPath(FileType.Jpeg, new[] { (byte)0xff, (byte)0xd8 });
_root.AddPath(FileType.Tiff, Encoding.UTF8.GetBytes("II"), new byte[] { 0x2a, 0x00 });
_root.AddPath(FileType.Tiff, Encoding.UTF8.GetBytes("MM"), new byte[] { 0x00, 0x2a });
_root.AddPath(FileType.Psd, Encoding.UTF8.GetBytes("8BPS"));
_root.AddPath(FileType.Png, new byte[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52 });
_root.AddPath(FileType.Bmp, Encoding.UTF8.GetBytes("BM"));
// TODO technically there are other very rare magic numbers for OS/2 BMP files...
_root.AddPath(FileType.Gif, Encoding.UTF8.GetBytes("GIF87a"));
_root.AddPath(FileType.Gif, Encoding.UTF8.GetBytes("GIF89a"));
_root.AddPath(FileType.Ico, new byte[] { 0x00, 0x00, 0x01, 0x00 });
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x00, 0x01 });
// multiple PCX versions, explicitly listed
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x02, 0x01 });
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x03, 0x01 });
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x05, 0x01 });
_root.AddPath(FileType.Riff, Encoding.UTF8.GetBytes("RIFF"));
_root.AddPath(FileType.Arw, Encoding.UTF8.GetBytes("II"), new byte[] { 0x2a, 0x00, 0x08, 0x00 });
_root.AddPath(FileType.Crw, Encoding.UTF8.GetBytes("II"), new byte[] { 0x1a, 0x00, 0x00, 0x00 }, Encoding.UTF8.GetBytes("HEAPCCDR"));
_root.AddPath(FileType.Cr2, Encoding.UTF8.GetBytes("II"), new byte[] { 0x2a, 0x00, 0x10, 0x00, 0x00, 0x00, 0x43, 0x52 });
_root.AddPath(FileType.Nef, Encoding.UTF8.GetBytes("MM"), new byte[] { 0x00, 0x2a, 0x00, 0x00, 0x00, 0x80, 0x00 });
_root.AddPath(FileType.Orf, Encoding.UTF8.GetBytes("IIRO"), new byte[] { 0x08, 0x00 });
_root.AddPath(FileType.Orf, Encoding.UTF8.GetBytes("IIRS"), new byte[] { 0x08, 0x00 });
_root.AddPath(FileType.Raf, Encoding.UTF8.GetBytes("FUJIFILMCCD-RAW"));
_root.AddPath(FileType.Rw2, Encoding.UTF8.GetBytes("II"), new byte[] { 0x55, 0x00 });
}
static FileTypeDetector()
{
_root = new ByteTrie <FileType>();
_root.SetDefaultValue(FileType.Unknown);
// https://en.wikipedia.org/wiki/List_of_file_signatures
_root.AddPath(FileType.Jpeg, new[] { (byte)0xff, (byte)0xd8 });
_root.AddPath(FileType.Tiff, Encoding.UTF8.GetBytes("II"), new byte[] { 0x2a, 0x00 });
_root.AddPath(FileType.Tiff, Encoding.UTF8.GetBytes("MM"), new byte[] { 0x00, 0x2a });
_root.AddPath(FileType.Psd, Encoding.UTF8.GetBytes("8BPS"));
_root.AddPath(FileType.Png, new byte[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52 });
_root.AddPath(FileType.Bmp, Encoding.UTF8.GetBytes("BM"));
// TODO technically there are other very rare magic numbers for OS/2 BMP files...
_root.AddPath(FileType.Gif, Encoding.UTF8.GetBytes("GIF87a"));
_root.AddPath(FileType.Gif, Encoding.UTF8.GetBytes("GIF89a"));
_root.AddPath(FileType.Ico, new byte[] { 0x00, 0x00, 0x01, 0x00 });
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P1")); // ASCII B&W
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P2")); // ASCII greyscale
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P3")); // ASCII RGB
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P4")); // RAW B&W
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P5")); // RAW greyscale
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P6")); // RAW RGB
_root.AddPath(FileType.Netpbm, Encoding.UTF8.GetBytes("P7")); // PAM
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x00, 0x01 });
// multiple PCX versions, explicitly listed
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x02, 0x01 });
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x03, 0x01 });
_root.AddPath(FileType.Pcx, new byte[] { 0x0A, 0x05, 0x01 });
_root.AddPath(FileType.Riff, Encoding.UTF8.GetBytes("RIFF"));
_root.AddPath(FileType.Arw, Encoding.UTF8.GetBytes("II"), new byte[] { 0x2a, 0x00, 0x08, 0x00 });
_root.AddPath(FileType.Crw, Encoding.UTF8.GetBytes("II"), new byte[] { 0x1a, 0x00, 0x00, 0x00 }, Encoding.UTF8.GetBytes("HEAPCCDR"));
_root.AddPath(FileType.Cr2, Encoding.UTF8.GetBytes("II"), new byte[] { 0x2a, 0x00, 0x10, 0x00, 0x00, 0x00, 0x43, 0x52 });
_root.AddPath(FileType.Nef, Encoding.UTF8.GetBytes("MM"), new byte[] { 0x00, 0x2a, 0x00, 0x00, 0x00, 0x80, 0x00 });
_root.AddPath(FileType.Orf, Encoding.UTF8.GetBytes("IIRO"), new byte[] { 0x08, 0x00 });
_root.AddPath(FileType.Orf, Encoding.UTF8.GetBytes("MMOR"), new byte[] { 0x00, 0x00 });
_root.AddPath(FileType.Orf, Encoding.UTF8.GetBytes("IIRS"), new byte[] { 0x08, 0x00 });
_root.AddPath(FileType.Raf, Encoding.UTF8.GetBytes("FUJIFILMCCD-RAW"));
_root.AddPath(FileType.Rw2, Encoding.UTF8.GetBytes("II"), new byte[] { 0x55, 0x00 });
_fixedCheckers = new Func <byte[], FileType>[]
{
bytes => bytes.RegionEquals(4, 4, Encoding.UTF8.GetBytes("ftyp")) ? FileType.QuickTime : FileType.Unknown
};
}