• _max_print_height : HuffmanTree
• bitsMap_ : HuffmanTree
• currentBit_ : BinaryFileReader , BinaryFileWriter
• currentByte_ : BinaryFileReader , BinaryFileWriter
• file_ : BinaryFileReader , BinaryFileWriter
• freq : HuffmanTree::TreeNode
• left : HuffmanTree::TreeNode
• maxBytes_ : BinaryFileReader
• numRead_ : BinaryFileReader
• paddingBits_ : BinaryFileReader
• right : HuffmanTree::TreeNode
• root_ : HuffmanTree