/// <summary>
/// Extracts and caches the metadata for an image.
/// </summary>
/// <param name="pictureFileInfo">The FileInfo to the image.</param>
/// <returns>The MetaData for the image.</returns>
internal static Metadata GetImageData(FileInfo pictureFileInfo)
{
try
{
string cacheKey = "data(" + pictureFileInfo.FullName + ")";
Cache cache = HttpContext.Current.Cache;
object cached = cache[cacheKey];
if (cached == null)
{
Metadata data = new Metadata();
ExifReader exif = new ExifReader(pictureFileInfo);
exif.Extract(data);
IptcReader iptc = new IptcReader(pictureFileInfo);
iptc.Extract(data);
JpegReader jpeg = new JpegReader(pictureFileInfo);
jpeg.Extract(data);
cache.Insert(cacheKey, data, new CacheDependency(pictureFileInfo.FullName));
return(data);
}
return((Metadata)cached);
}
catch
{
return(new Metadata());
}
}
public IAttributeReader CreateFromSegments(FileInfo file, IEnumerable <JpegSegment> segments)
{
var exifReader = new ExifReader();
foreach (var segment in segments)
{
if (IsExifSegment(segment))
{
var directories = exifReader.Extract(new ByteArrayReader(segment.Bytes, ExifHeader.Length));
return(new ExifAttributeReader(new ExifMetadata(segment, directories), _tags));
}
}
return(new ExifAttributeReader(new ExifMetadata(null, null), _tags));
}