TiffEntryBE(ref FileMap f, UInt32 offset, UInt32 up_offset)
{
parent_offset = up_offset;
own_data = null;
empty_data = 0;
file = f;
type = TiffDataType.TIFF_UNDEFINED; // We set type to undefined to avoid debug assertion errors.
byte[] temp_data = f.getData(offset, 8);
tag = (TiffTag)get2BE(temp_data, 0);
type = (TiffDataType)get2BE(temp_data, 2);
count = get4BE(temp_data, 4);
if ((int)type > 13)
{
TiffParserException.ThrowTPE("Error reading TIFF structure. Unknown Type " + type + " encountered.");
}
bytesize = (UInt64)count << (int)Data.datashifts[(int)type];
if (bytesize > UInt32.MaxValue)
{
TiffParserException.ThrowTPE("TIFF entry is supposedly " + bytesize + " bytes");
}
if (bytesize == 0) // Better return empty than null-dereference later
{
data = empty_data;
}
else if (bytesize <= 4)
{
data = f.getDataWrt(offset + 8, bytesize);
}
else
{ // offset
data_offset = get4BE(f.getData(offset + 8, 4), 0);
data = f.getDataWrt(data_offset, bytesize);
}
}
public void fetchData()
{
data = file?.getDataWrt(data_offset, bytesize);
}