public int doDeserializeFromByteArray(byte[] byteArray, int startIndex) throws IOException {
        this.number = BitConverter.toInt32(byteArray, startIndex);
        return 4;
    }
This method is used to deserialize the number of array from the specified byte array and start index.

@param byteArray  Specify the byte array.
@param startIndex Specify the start index from the byte array.
@return Return the length in byte of the number of array.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/onenote/fsshttpb/property/ArrayNumber.java