/// <summary>
/// Reads the TIFF header to the provided structure.
/// </summary>
/// <param name="inputStream">The input stream of TIFF data.</param>
/// <param name="length">Length of the TIFF data.</param>
/// <param name="tiffHeader">TIFF header.</param>
/// <returns>
/// Remaining length of the data on success, 0 on failure.
/// </returns>
private static int ReadTiffHeader(Stream inputStream, int length, TiffHeader tiffHeader)
{
if (length <= 8)
{
return(0);
}
// Read the byte order
tiffHeader.ByteOrder = StreamProcessor.ReadPackedInt(inputStream, 4, false);
length -= 4;
if (tiffHeader.ByteOrder != TIFF_BYTE_ORDER_LITTLE_END &&
tiffHeader.ByteOrder != TIFF_BYTE_ORDER_BIG_END)
{
Debug.WriteLine("Invalid TIFF header");
return(0);
}
tiffHeader.LittleEndian = (tiffHeader.ByteOrder == TIFF_BYTE_ORDER_LITTLE_END);
// Read the offset of the first IFD and check if it is reasonable
tiffHeader.FirstIfdOffset =
StreamProcessor.ReadPackedInt(inputStream, 4, tiffHeader.LittleEndian);
length -= 4;
if (tiffHeader.FirstIfdOffset < 8 || tiffHeader.FirstIfdOffset - 8 > length)
{
Debug.WriteLine("Invalid offset");
return(0);
}
return(length);
}
public async Task ReadFirstIfdAsync_ReadsCorrectly(ByteOrder byteOrder)
{
var stream = new StreamBuilder(byteOrder)
.WritePadding(20)
.WriteInt16(3)
.WriteTiffIfdEntry(2, TiffType.Ascii, 20, new byte[] { 1, 2, 3, 4 })
.WriteTiffIfdEntry(4, TiffType.Short, 40, new byte[] { 2, 3, 4, 5 })
.WriteTiffIfdEntry(6, TiffType.Double, 60, new byte[] { 3, 4, 5, 6 })
.WriteUInt32(123456)
.ToStream();
var header = new TiffHeader {
FirstIfdReference = new TiffIfdReference(20)
};
var ifd = await TiffReader.ReadFirstIfdAsync(header, stream, byteOrder);
Assert.Equal(3, ifd.Entries.Length);
AssertTiff.Equal(new TiffIfdEntry {
Tag = 2, Type = TiffType.Ascii, Count = 20, Value = new byte[] { 1, 2, 3, 4 }
}, ifd.Entries[0]);
AssertTiff.Equal(new TiffIfdEntry {
Tag = 4, Type = TiffType.Short, Count = 40, Value = new byte[] { 2, 3, 4, 5 }
}, ifd.Entries[1]);
AssertTiff.Equal(new TiffIfdEntry {
Tag = 6, Type = TiffType.Double, Count = 60, Value = new byte[] { 3, 4, 5, 6 }
}, ifd.Entries[2]);
Assert.Equal(new TiffIfdReference(123456), ifd.NextIfdReference);
}
/// <summary>
/// Reads orientation information from TIFF data.
/// </summary>
/// <param name="inputStream">The input stream of TIFF data.</param>
/// <param name="length">Length of the TIFF data.</param>
/// <returns>
/// Orientation information (1/3/6/8 on success, 0 if not found).
/// </returns>
public static int ReadOrientationFromTIFF(Stream inputStream, int length)
{
// Read tiff header
TiffHeader tiffHeader = new TiffHeader();
length = ReadTiffHeader(inputStream, length, tiffHeader);
// Move to the first IFD
// offset is relative to the beginning of the TIFF data
// and we already consumed the first 8 bytes of header
int toSkip = tiffHeader.FirstIfdOffset - 8;
if (length == 0 || toSkip > length)
{
return(0);
}
inputStream.Seek(toSkip, SeekOrigin.Current);
length -= toSkip;
// Move to the entry with orientation tag
length = MoveToTiffEntryWithTag(
inputStream, length, tiffHeader.LittleEndian, TIFF_TAG_ORIENTATION);
// Read orientation
return(GetOrientationFromTiffEntry(inputStream, length, tiffHeader.LittleEndian));
}
private bool readHeaderOk(ref TiffHeader header)
{
bool res = readShortOK(out header.tiff_magic);
if (res)
{
res = readShortOK(out header.tiff_version);
}
if (res)
{
if (header.tiff_version == TIFF_BIGTIFF_VERSION)
{
res = readShortOK(out header.tiff_offsize);
if (res)
{
res = readShortOK(out header.tiff_fill);
}
if (res)
{
res = readUlongOK(out header.tiff_diroff);
}
}
else
{
uint intout;
res = readUIntOK(out intout);
header.tiff_diroff = intout;
}
}
return(res);
}
public void SizeOfHeader_AlwaysReturnsEightBytes()
{
var header = new TiffHeader();
var size = TiffReader.SizeOfHeader(header);
Assert.Equal(8, size);
}
internal override IFDHeader ParseBytes(List <byte> bytes, Endianness e, int offsetCorrectionIndex)
{
IFDHeader result = new IFDHeader(typeof(NikonType3MakerNotesTagCode));
TiffHeader tiffHeader = exifProcessor.GetTiffHeader(bytes, 10);
result = exifProcessor.GetIFDHeader <NikonType3MakerNotesTagCode>(IFDHeaderType.MakerNotesHeader, bytes, 10 + 8, 10 + 8, tiffHeader.ByteOrder);
return(result);
}
public void TryParse_ValidStreamButInvalidStartIndex_ReturnFalseAndOutputNull()
{
var correctTiffStream = new FileStream(Constants.TiffSamplePath, FileMode.Open, FileAccess.Read);
var invalidStartIndexStreamResult =
TiffHeader.TryParse(correctTiffStream, 1, out var headerInvalidStartIndexResult);
Assert.IsFalse(invalidStartIndexStreamResult);
Assert.IsNull(headerInvalidStartIndexResult);
correctTiffStream.Dispose();
}
private bool readHeaderOkWithoutExceptions(ref TiffHeader header)
{
try
{
return(readHeaderOk(ref header));
}
catch
{
WarningExt(this, m_clientdata, m_name, "Failed to read header");
return(false);
}
}
public void TryParse_ValidStream_ReturnTrueAndCorrectNull()
{
var validStream = new FileStream(Constants.TiffSamplePath, FileMode.Open, FileAccess.Read, FileShare.Read);
var validStreamResult = TiffHeader.TryParse(validStream, 0, out var tiffHeader);
Assert.IsTrue(validStreamResult);
Assert.IsNotNull(tiffHeader);
Assert.AreEqual(0x002A, tiffHeader.VersionNumber);
Assert.IsTrue(tiffHeader.ByteOrder == ByteOrder.BigEndian || tiffHeader.ByteOrder == ByteOrder.LittleEndian);
Assert.IsTrue(tiffHeader.OffsetOfIfd0 > 0);
validStream.Dispose();
}
private bool readHeaderOkWithoutExceptions(ref TiffHeader header)
{
try
{
return(readHeaderOk(ref header));
}
#pragma warning disable CA1031 // Do not catch general exception types
catch
#pragma warning restore CA1031 // Do not catch general exception types
{
WarningExt(this, m_clientdata, m_name, "Failed to read header");
return(false);
}
}
public RawBase(ref byte[] Content)
{
if (IsCR3(Content))
{
_rawType = RawType.CR3;
this._content = Content;
crxheader = new CRXHeader(ref Content);
}
else
{
_rawType = RawType.Tiff;
this._content = Content;
_header = new TiffHeader(ref Content);
}
}
private bool writeHeaderOK(TiffHeader header)
{
bool res = writeShortOK(header.tiff_magic);
if (res)
{
res = writeShortOK(header.tiff_version);
}
if (res)
{
res = writeIntOK((int)header.tiff_diroff);
}
return(res);
}
public static ImageInfo GetImageInfo(Stream imageStream)
{
if (Utility.StreamContainsJpegSoiEoiMarker(imageStream))
{
//TODO parse jpeg
return(null);
}
if (TiffHeader.TryParse(imageStream, 0, out TiffHeader header))
{
//TODO Parse TIFF files.
return(null);
}
throw new InvalidImageFormatException();
}
private bool readHeaderOk(ref TiffHeader header)
{
bool res = readShortOK(out header.tiff_magic);
if (res)
{
res = readShortOK(out header.tiff_version);
}
if (res)
{
res = readUIntOK(out header.tiff_diroff);
}
return(res);
}
private TiffHeader FindTiffCR3(CRXIFD[] ifd)
{
TiffHeader tiffHeader = null;
foreach (var i in ifd)
{
if (i.SubIFD.Length > 0)
{
tiffHeader = FindTiffCR3(i.SubIFD);
}
if (i.TiffData != null)
{
tiffHeader = i.TiffData;
}
if (tiffHeader != null)
{
return(tiffHeader);
}
}
return(tiffHeader);
}
private bool writeHeaderOK(TiffHeader header)
{
// if we are here the cached image directory shortcut jump is invalid
resetPenultimateDirectoryOffset();
bool res = writeShortOK(header.tiff_magic);
if (res)
{
res = writeShortOK(header.tiff_version);
}
if (header.tiff_version == TIFF_BIGTIFF_VERSION)
{
if (res)
{
res = writeShortOK(header.tiff_offsize);
}
if (res)
{
res = writeShortOK(header.tiff_fill);
}
if (res)
{
res = writelongOK((long)header.tiff_diroff);
}
}
else
{
if (res)
{
res = writeIntOK((int)header.tiff_diroff);
}
if (res)
{
res = writelongOK(0);
}
}
return(res);
}
private bool writeHeaderOK(TiffHeader header)//ALEX
{
//If we are here the cached directory jump is invalid
AlexNextDirHighWaterMarkClear();
bool res = writeShortOK(header.tiff_magic);
if (res)
{
res = writeShortOK(header.tiff_version);
}
if (header.tiff_version == TIFF_BIGTIFF_VERSION)
{
if (res)
{
res = writeShortOK(header.tiff_offsize);
}
if (res)
{
res = writeShortOK(header.tiff_fill);
}
if (res)
{
res = writelongOK((long)header.tiff_diroff);//ALEX2
}
}
else
{
if (res)
{
res = writeIntOK((int)header.tiff_diroff);
}
if (res)
{
res = writelongOK(0);//ALEX2
}
}
return(res);
}
public void TryParse_InvalidStream_ReturnFalseAndOutputNull()
{
var invalidStream = new FileStream(Constants.InvalidImagePath, FileMode.Open, FileAccess.Read, FileShare.Read);
var veryShortStream = new MemoryStream(Encoding.UTF8.GetBytes("er"));
var closedStream = new MemoryStream();
closedStream.Dispose();
var noReadPermissionStream = new FileStream(Constants.TiffSamplePath, FileMode.Open, FileAccess.Write);
var nullStreamResult = TiffHeader.TryParse(null, 0, out var headerNullResult);
var invalidStreamResult = TiffHeader.TryParse(invalidStream, 0, out var headerInvalidResult);
var veryShortStreamResult = TiffHeader.TryParse(veryShortStream, 0, out var headerVeryShortResult);
var closeStreamResult = TiffHeader.TryParse(closedStream, 0, out var headerClosedResult);
var noReadPermissionStreamResult =
TiffHeader.TryParse(noReadPermissionStream, 0, out var headerNoReadPermissionResult);
Assert.IsFalse(nullStreamResult);
Assert.IsNull(headerNullResult);
Assert.IsFalse(invalidStreamResult);
Assert.IsNull(headerInvalidResult);
Assert.IsFalse(veryShortStreamResult);
Assert.IsNull(headerVeryShortResult);
Assert.IsFalse(closeStreamResult);
Assert.IsNull(headerClosedResult);
Assert.IsFalse(noReadPermissionStreamResult);
Assert.IsNull(headerNoReadPermissionResult);
invalidStream.Dispose();
veryShortStream.Dispose();
noReadPermissionStream.Dispose();
}
private bool writeHeaderOK(TiffHeader header)
{
bool res = writeShortOK(header.tiff_magic);
if (res)
{
res = writeShortOK(header.tiff_version);
}
if (header.tiff_version == TIFF_BIGTIFF_VERSION)
{
if (res)
{
res = writeShortOK(header.tiff_offsize);
}
if (res)
{
res = writeShortOK(header.tiff_fill);
}
if (res)
{
res = writelongOK((long)header.tiff_diroff);
}
}
else
{
if (res)
{
res = writeIntOK((int)header.tiff_diroff);
}
if (res)
{
res = writelongOK(0);
}
}
return(res);
}
public CRXIFD(byte[] content, uint offset)
{
size = TiffType.getInt(offset, content, true);
Name = Encoding.ASCII.GetString(content, (int)offset + SizeLen, NameLen).ToString();
if (Name == "PRVW")
{
PRVW = CRXParser.ParsePRVW(content, offset);
}
no = SizeLen + NameLen;
if (size == 1)
{
size = TiffType.getInt((uint)(offset + no), content, true);
no = SizeLen + NameLen + 8;
}
if (dicCount.Keys.Contains(Name))
{
dicCount[Name]++;
}
else
{
dicCount.Add(Name, 1);
}
if (tags.Contains(Name))
{
FillTags(Name, content, offset + no, size - no);
}
if (cmt.Contains(Name) || Name == "CMT")
{
TiffData = FillTiff(content, offset + no, size - no);
}
if (innerParsing.Contains(Name))
{
var adressOffsetParent = (uint)(offset + no);
if (Name == "uuid")
{
adressOffsetParent = adressOffsetParent + UUIDLen;
}
uint adressOffset = adressOffsetParent;
do
{
var crx = new CRXIFD(content, adressOffset);
adressOffset = crx.NextIFDOffset;
lstCRXIFD.Add(crx);
if (crx.Name == "\0\0\0\u0001")
{
break;
}
} while (adressOffset < (adressOffsetParent + size));
}
if (innerOffsets.Keys.Contains(Name))
{
size = (int)(size - no - innerOffsets[Name]);
}
if (Name == "trak")
{
Name = "trak" + dicCount["trak"];
}
NextIFDOffset = (uint)(offset + size);
}
