https://github.com/jeffreymorganio/optimise-ip-to-country-data

Optimize IP to country CSV files by collapsing sequential entries.
https://github.com/jeffreymorganio/optimise-ip-to-country-data

Last synced: 6 days ago
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Optimize IP to country CSV files by collapsing sequential entries.

• Host: GitHub
• URL: https://github.com/jeffreymorganio/optimise-ip-to-country-data
• Owner: jeffreymorganio
• License: mit
• Created: 2012-03-02T12:13:17.000Z (almost 13 years ago)
• Default Branch: master
• Last Pushed: 2016-02-27T14:52:24.000Z (almost 9 years ago)
• Last Synced: 2023-03-22T19:55:53.961Z (almost 2 years ago)
• Language: PHP
• Homepage: http://usabilityetc.com/articles/optimising-geolocation-data/
• Size: 3.91 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
optimiseIP2Country.php

======================

About

-----

The `optimiseIP2Country.php` PHP script takes an IP to country CSV data file and optimises it by:

1. removing the three-letter country code and country name;

2. collapsing sequential entries from the same country; and

3. not double-quoting values in the CSV output.

The expected format of the IP to country CSV file is as follows:

    "16777216","17367039","AU","AUS","AUSTRALIA"

(If the input file is not in this format, it is simple enough to change the regular expression that parses the CSV data in the `parseLineOfData` function.)

The output produced by the script is in the following format:

    16777216,17367039,AU

For simplicity, this script terminates if it encounters lines in the input file that are blank or that cannot be parsed (which should not occur in correctly-formatted IP to country CSV files).

Collapsing Sequential Entries

-----------------------------

The following example illustrates the collapsing of sequential entries. The start IP address of the second entry is one more than the end IP address of the first entry:

    Start IP  End IP    Country Code

    982122496,982155263,JP

    982155264,982171647,JP

Therefore, we can merge these two entries into the following single entry:

    982122496,982171647,JP

Use

---

Call `optimiseIP2Country.php` on the command line :

    optimiseIP2Country.php INPUT_FILENAME > OUTPUT_FILENAME

Example:

    optimiseIP2Country.php ip-to-country.csv > optimised-ip-to-country.csv

More Information

----------------

For a complete description of this optimisation technique, please read [Optimising IP Geolocation Data](http://usabilityetc.com/articles/optimising-geolocation-data/).