#pragma warning restore IDE0032 // Use auto property
public ParserIFDEntry(EndianBinaryReader reader, ExifSection section)
{
entry = new IFDEntry(reader);
offsetIsBigEndian = reader.Endianess == Endianess.Big;
Section = section;
}
public MetadataOffset(ExifSection section, uint offset)
{
Section = section;
Offset = offset;
}
private static List <ParserIFDEntry> ParseDirectories(EndianBinaryReader reader, uint firstIFDOffset)
{
List <ParserIFDEntry> items = new();
bool foundExif = false;
bool foundGps = false;
bool foundInterop = false;
Queue <MetadataOffset> ifdOffsets = new();
ifdOffsets.Enqueue(new MetadataOffset(ExifSection.Image, firstIFDOffset));
while (ifdOffsets.Count > 0)
{
MetadataOffset metadataOffset = ifdOffsets.Dequeue();
ExifSection section = metadataOffset.Section;
uint offset = metadataOffset.Offset;
if (offset >= reader.Length)
{
continue;
}
reader.Position = offset;
ushort count = reader.ReadUInt16();
if (count == 0)
{
continue;
}
items.Capacity += count;
for (int i = 0; i < count; i++)
{
ParserIFDEntry entry = new(reader, section);
switch (entry.Tag)
{
case TiffConstants.Tags.ExifIFD:
if (!foundExif)
{
foundExif = true;
ifdOffsets.Enqueue(new MetadataOffset(ExifSection.Photo, entry.Offset));
}
break;
case TiffConstants.Tags.GpsIFD:
if (!foundGps)
{
foundGps = true;
ifdOffsets.Enqueue(new MetadataOffset(ExifSection.GpsInfo, entry.Offset));
}
break;
case TiffConstants.Tags.InteropIFD:
if (!foundInterop)
{
foundInterop = true;
ifdOffsets.Enqueue(new MetadataOffset(ExifSection.Interop, entry.Offset));
}
break;
case TiffConstants.Tags.StripOffsets:
case TiffConstants.Tags.RowsPerStrip:
case TiffConstants.Tags.StripByteCounts:
case TiffConstants.Tags.SubIFDs:
case TiffConstants.Tags.ThumbnailOffset:
case TiffConstants.Tags.ThumbnailLength:
// Skip the thumbnail and/or preview images.
// The StripOffsets and StripByteCounts tags are used to store a preview image in some formats.
// The SubIFDs tag is used to store thumbnails in TIFF and for storing other data in some camera formats.
//
// Note that some cameras will also store a thumbnail as part of their private data in the EXIF MakerNote tag.
// The EXIF MakerNote tag is treated as an opaque blob, so those thumbnails will be preserved.
break;
default:
items.Add(entry);
break;
}
System.Diagnostics.Debug.WriteLine(entry.ToString());
}
}
return(items);
}
