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must read to get the string If the length is zero we simply return an empty string Otherwise, we attempt to read the speci ed number of bytes If we don t get any data or if the data is not the size we expected (ie, it is too little), we raise a ValueError exception If we have the right number of bytes we create a suitable format string for the
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structunpack() function, and we return the string that results from unpacking
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the data and decoding the bytes as UTF-8 (In theory, we could replace the last two lines with return datadecode("utf8"), but we prefer to go through the unpacking process since it is possible though unlikely that the s format performs some transformation on our data which must be reversed when reading back) We will now look at the rest of the import_binary() method, breaking it into two parts for ease of explanation
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fh = None try: fh = open(filename, "rb") magic = fhread(len(GZIP_MAGIC)) if magic == GZIP_MAGIC: fhclose() fh = gzipopen(filename, "rb") else: fhseek(0) magic = fhread(len(MAGIC)) if magic != MAGIC: raise ValueError("invalid aib file format") version = fhread(len(FORMAT_VERSION)) if version > FORMAT_VERSION: raise ValueError("unrecognized aib file version") selfclear()
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The le may or may not be compressed, so we use the same technique that we used for reading pickles to open the le using gzipopen() or the built-in open() function Once the le is open and we are at the beginning, we read the rst four bytes (len(MAGIC)) If these don t match our magic number we know that it isn t a binary aircraft incident data le and so we raise a ValueError exception Next we read in the 2-byte version number It is at this point that we would use different reading code depending on the version Here we just check that the version isn t a later one than this program is able to read If the magic number is correct and the version is one we can handle, we are ready to read in the data, so we begin by clearing out all the existing incidents so that the dictionary is empty
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while True: report_id = unpack_string(fh, False) if report_id is None: break data = {} data["report_id"] = report_id for name in ("airport", "aircraft_id", "aircraft_type", "narrative"): data[name] = unpack_string(fh) other_data = fhread(NumbersStructsize) numbers = NumbersStructunpack(other_data) data["date"] = datetimedatefromordinal(numbers[0]) data["pilot_percent_hours_on_type"] = numbers[1] data["pilot_total_hours"] = numbers[2] data["midair"] = numbers[3] incident = Incident(**data) self[incidentreport_id] = incident return True
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The while block loops until we run out of data We start by trying to get a report ID If we get None we ve reached the end of the le and can break out of the loop Otherwise, we create a dictionary called data to hold the data for one incident and attempt to get the rest of the incident s data For the strings we use the unpack_string() method, and for the other data we read it all in one go using the NumbersStruct struct Since we stored the date as an ordinal we must do the reverse conversion to get a date back But for the other items, we can just use the unpacked data no validation or conversion is required since we wrote the correct data types in the rst place and have read back the same data types using the format held in the NumbersStruct struct If any error occurs, for example, if we fail to unpack all the numbers, an exception will be raised and will be handled in the except block (We haven t shown the except and finally blocks because they are structurally the same as those shown in the preceding subsection for the import_pickle() method)
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