Methods and apparatus for filtering input data objects are provided. A computing device can receive an input data object to be filtered; e.g., compressed/decompressed, decrypted/encrypted, bit converted. The computing device can determine whether the input data object has been previously filtered. After determining that the input data object has been previously filtered, the computing device can: determine a previously filtered data size for the input data object, allocate a memory buffer to store a filtered version of the input data object based on the previously filtered data size, and filter the input data object using the memory buffer. The computing device can generate an output based on the filtered data object.