public static Tiff.IfdEntry FromPtr(IntPtr ptr, IntPtr baseAddr)
{
TiffDirEntry _entry = (TiffDirEntry)Marshal.PtrToStructure(ptr, typeof(TiffDirEntry));
Tiff.IfdEntry _ifdEntry = new Tiff.IfdEntry {
Tag = _entry.tag,
DataType = _entry.type,
_data = Array.CreateInstance(TiffDataTypeHelper.Typeof(_entry.type), _entry.count <= int.MaxValue?_entry.count:0)
};
IntPtr _dataPtr = (IntPtr)(((_ifdEntry.DataSize = (int)(TiffDataTypeHelper.Sizeof(_entry.type) * _ifdEntry._data.Length)) > 4)?baseAddr.ToInt64() + _entry.offset:ptr.ToInt64() + 8);
_ifdEntry.DataOffset = (int)(_dataPtr.ToInt64() - baseAddr.ToInt64());
for (int i = 0, _size = TiffDataTypeHelper.Sizeof(_entry.type); i < _ifdEntry._data.Length; i++)
{
_ifdEntry._data.SetValue(Marshal.PtrToStructure((IntPtr)(_dataPtr.ToInt64() + _size * i), TiffDataTypeHelper.Typeof(_entry.type)), i);
}
return(_ifdEntry);
}
private int _GetSize()
{
int _size = 0;
for (Tiff.Ifd _idf = this.ImageFileDirectory; _idf != null; _idf = _idf.NextIfd)
{
if (_idf.Offset + _idf.Size > _size)
{
_size = _idf.Offset + _idf.Size;
}
Tiff.IfdEntry _stripOffsetsTag = null, _stripByteCountsTag = null;
Tiff.IfdEntry _freeOffsets = null, _freeByteCounts = null;
Tiff.IfdEntry _tileOffsets = null, _tileByteCounts = null;
foreach (IfdEntry _entry in _idf)
{
if (_entry.DataOffset + _entry.DataSize > _size)
{
_size = _entry.DataOffset + _entry.DataSize;
}
switch (_entry.Tag)
{
case TiffTags.STRIPOFFSETS:
_stripOffsetsTag = _entry;
break;
case TiffTags.STRIPBYTECOUNTS:
_stripByteCountsTag = _entry;
break;
case TiffTags.FREEOFFSETS:
_freeOffsets = _entry;
break;
case TiffTags.FREEBYTECOUNTS:
_freeByteCounts = _entry;
break;
case TiffTags.TILEOFFSETS:
_tileOffsets = _entry;
break;
case TiffTags.TILEBYTECOUNTS:
_tileByteCounts = _entry;
break;
}
}
foreach (IfdEntry[] _item in new Tiff.IfdEntry[][] { new[] { _stripOffsetsTag, _stripByteCountsTag }, new[] { _freeOffsets, _freeByteCounts }, new[] { _tileOffsets, _tileByteCounts } })
{
if (_item[0] != null && _item[1] != null && _item[0].Length == _item[1].Length)
{
for (int i = 0; i < _item[0].Length; i++)
{
int _dataOffset = Convert.ToInt32(_item[0][i]);
int _dataSize = Convert.ToInt32(_item[1][i]);
if (_dataOffset + _dataSize > _size)
{
_size = _dataOffset + _dataSize;
}
}
}
}
}
return(_size);
}
