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);
}
}
}
}
}
/// <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;
}