LOI Parser

This gem reads the .loi file format, parses its header and bitmap allowing you to:

retrieve the file's application, date, range, and version
check if s serial number is in opposition
grab all the serial numbers being marked in opposition

So far this gem only support "LOI" application files, not "dLOI" application files.

Installation

Add this line to your application's Gemfile:

gem 'loi_parser'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install loi_parser

Usage

> loi = LoiParser::Reader.new('/path/to/your/file.loi')

# Check the file header:
> loi.header
 => {:length=>"0042", :application=>"LOI", :version=>"01", :date=>"20200213", :date_range=>"1019", :list_format=>"BTMP", :bitmap_size=>32000000}

# Checking a given serial number being in opposition
> loi.in_opposition?(99_999_999)
 => true
> loi.in_opposition?(12_345_678)
 => false

# Grabbing all the serial numbers being in opposition
> loi.serials_in_opposition
I, [2023-03-14T14:33:12.606494 #135]  INFO -- LoiParser: 0% Found: 0 (Elapsed: 0 ms)
I, [2023-03-14T14:33:12.610240 #135]  INFO -- LoiParser: 1% Found: 0 (Elapsed: 3 ms)
I, [2023-03-14T14:33:12.616639 #135]  INFO -- LoiParser: 2% Found: 0 (Elapsed: 10 ms)
I, [2023-03-14T14:33:12.621245 #135]  INFO -- LoiParser: 3% Found: 0 (Elapsed: 14 ms)
I, [2023-03-14T14:33:12.625052 #135]  INFO -- LoiParser: 4% Found: 0 (Elapsed: 18 ms)
...
I, [2023-03-14T14:33:13.116982 #135]  INFO -- LoiParser: 99% Found: 50 (Elapsed: 510 ms)
I, [2023-03-14T14:33:13.120837 #135]  INFO -- LoiParser: 100% Found: 50 (Elapsed: 514 ms)
I, [2023-03-14T14:33:13.130306 #135]  INFO -- LoiParser: Gathered 5113 serial number(s) in opposition in 523 ms.

WARNING: This gem doesn't have a callback mechanism to pass found serial numbers on the go. Instead it stores all the serial numbers found in an Array which leads to a overflow failure depending on the machine's memory size.

Extracting all the serial numbers was an experiment we did in order to store the serial numbers in a database, but we have abondonned this way since it is very slow.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://gitlab.com/pharmony/loi-parser.

License

The gem is available as open source under the terms of the MIT License.