Explain Extended New Year 2019 post: a GIF decoder in PostgreSQL.
How to run it:
Download a GIF file
In bash shell, run:
cat sample.gif | od -A n -vt x1 | tr -d '\n ' | psql -f pre.sql -c "COPY input FROM stdin" -f gif.sql
This assumes you have
psqlcredentials set up for your database, refer to psql manual if you don't.
If you don't have access to
psql, hex-encode you gif file and insert it in the temporary table manually:
CREATE TEMPORARY TABLE input ( data TEXT ); INSERT INTO input VALUES ('<hex data here>');
gif.sqlin the same database session;
This script does not create any new objects in the database and does require any write permissions.
Requires PostgreSQL 9.3 or higher.
Enjoy the rendered GIF:
string_agg ------------ ..... ..... ..... ...#### ...#### ####... ####... ..... ..... .....
This is an excercise in SQL and does not render each and every GIF file. It does not work with animated GIF and those with transparency. If you open your file in
mspaint.exe and save it as a GIF, it will probably work.
Large files might take a while to decode and render, be patient.
Happy New Year!