lensfun_dbupdate

Cross-platform C++ program to update lensfun databases. All code in this repository is licensed GPL2.

A quite-hacky command line program that'll access lensfun.sourceforge.net to check timestamps, check available versions, download a specified version, and unpack it in the relevant directory. Behavior is roughly equivalent to the lensfun-update-data python script in the lensfun source tree.

Of note is that all the guts of the program are implemented in the lensfun_dbupdate.h/cpp source. There are two exposed functions:

//checks available database version, state of installed version:
lf_db_return lensfun_dbcheck(int version,  std::string dbpath=std::string(), std::string dburl="http://lensfun.sourceforge.net/db/");

//does the full data base availbility and version checks, retrieves and installs new database:
lf_db_return lensfun_dbupdate(int version, std::string dbpath=std::string(), std::string dburl="http://lensfun.sourceforge.net/db/");

ready for incorporation in other software.

Dependencies:

• libcurl: does the file retrieval
• libarchive: unpacks the tar.bz2 database packages

These are available in most package libraries, including MSYS2. In Ubuntu/Debian:

$ sudo apt-get install libcurl-dev libarchive-deb

Compiling

$ make

(there's no make install... put the executable in a directory covered by your PATH.)