public override void Completed(IndexedReader reader, int tiffHeaderOffset)
{
if (_storeThumbnailBytes)
{
// after the extraction process, if we have the correct tags, we may be able to store thumbnail information
var thumbnailDirectory = Directories.OfType<ExifThumbnailDirectory>().FirstOrDefault();
if (thumbnailDirectory != null && thumbnailDirectory.ContainsTag(ExifDirectoryBase.TagCompression))
{
int offset;
int length;
if (thumbnailDirectory.TryGetInt32(ExifThumbnailDirectory.TagThumbnailOffset, out offset) &&
thumbnailDirectory.TryGetInt32(ExifThumbnailDirectory.TagThumbnailLength, out length))
{
try
{
var thumbnailData = reader.GetBytes(tiffHeaderOffset + offset, length);
thumbnailDirectory.ThumbnailData = thumbnailData;
}
catch (IOException ex)
{
thumbnailDirectory.AddError("Invalid thumbnail data specification: " + ex.Message);
}
}
}
}
}
/// <summary>Reads JFXX values and returns them in an <see cref="JfxxDirectory"/>.</summary>
public JfxxDirectory Extract(IndexedReader reader)
{
var directory = new JfxxDirectory();
try
{
// For JFIF the tag number is the value's byte offset
directory.Set(JfxxDirectory.TagExtensionCode, reader.GetByte(JfxxDirectory.TagExtensionCode));
}
catch (IOException e)
{
directory.AddError(e.Message);
}
return directory;
}
/// <summary>Reads JFIF values and returns them in an <see cref="JfifDirectory"/>.</summary>
public JfifDirectory Extract(IndexedReader reader)
{
var directory = new JfifDirectory();
try
{
// For JFIF the tag number is the value's byte offset
directory.Set(JfifDirectory.TagVersion, reader.GetUInt16(JfifDirectory.TagVersion));
directory.Set(JfifDirectory.TagUnits, reader.GetByte(JfifDirectory.TagUnits));
directory.Set(JfifDirectory.TagResX, reader.GetUInt16(JfifDirectory.TagResX));
directory.Set(JfifDirectory.TagResY, reader.GetUInt16(JfifDirectory.TagResY));
directory.Set(JfifDirectory.TagThumbWidth, reader.GetByte(JfifDirectory.TagThumbWidth));
directory.Set(JfifDirectory.TagThumbHeight, reader.GetByte(JfifDirectory.TagThumbHeight));
}
catch (IOException e)
{
directory.AddError(e.Message);
}
return directory;
}
Extract(IndexedReader reader, int readerOffset = 0)
{
var directories = new List<Directory>();
try
{
// Read the TIFF-formatted Exif data
TiffReader.ProcessTiff(reader, new ExifTiffHandler(directories, StoreThumbnailBytes), readerOffset);
}
catch (TiffProcessingException e)
{
// TODO what do to with this error state?
Console.Error.WriteLine(e);
}
catch (IOException e)
{
// TODO what do to with this error state?
Console.Error.WriteLine(e);
}
return directories;
}
/// <exception cref="System.IO.IOException"/>
public override bool CustomProcessTag(int tagOffset, ICollection<int> processedIfdOffsets, int tiffHeaderOffset, IndexedReader reader, int tagId, int byteCount)
{
// Custom processing for the Makernote tag
if (tagId == ExifDirectoryBase.TagMakernote && CurrentDirectory is ExifSubIfdDirectory)
{
return ProcessMakernote(tagOffset, processedIfdOffsets, tiffHeaderOffset, reader);
}
// Custom processing for embedded IPTC data
if (tagId == ExifDirectoryBase.TagIptcNaa && CurrentDirectory is ExifIfd0Directory)
{
// NOTE Adobe sets type 4 for IPTC instead of 7
if (reader.GetSByte(tagOffset) == 0x1c)
{
var iptcBytes = reader.GetBytes(tagOffset, byteCount);
Directories.Add(new IptcReader().Extract(new SequentialByteArrayReader(iptcBytes), iptcBytes.Length));
return true;
}
return false;
}
return false;
}
public abstract bool CustomProcessTag(int tagOffset, ICollection<int> processedIfdOffsets, int tiffHeaderOffset, IndexedReader reader, int tagId, int byteCount);
public abstract void Completed(IndexedReader reader, int tiffHeaderOffset);
