public List<Ext4Extent> getExtentEntries() {
		if ( extentEntries == null ) {
			return Collections.emptyList( );
		}
		return extentEntries;
	}
Reads an IBlock that is expected to contain extents

@param provider {@link ByteProvider} to read from
@param offset offset of the extent header
@return new Ext4IBlock
@throws IOException if error
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/ext4/Ext4IBlock.java