Dear Julia community,
I’d like to announce FortranFiles.jl, a small package for reading and writing Fortran “unformatted” (i.e. binary) files. You might want to use this if you have legacy data produced by Fortran programs, or if you need to produce data which your Fortran program can digest. Thus it can help to incrementally move your computing tools from Fortran to Julia.
The package is available in METADATA, so you can just
Pkg.add it. Julia versions 0.5 and 0.6 are supported. Full documentation is available here, including examples of how to translate your Fortran read and write statements into Julia.
The package currently focuses on “sequential-access” files, which are the most commonly used binary files in Fortran. In such files, data records are preceeded and followed by “record markers” which encode the length of the record. Unfortunately, Fortran compilers differed in the way to encode these markers, and this package supports various such encodings (well, the ones I know of).
“Direct-access” files are currently not supported, but the package has been designed such that it shouldn’t be too difficult to add support. However, I have no experience with such files and no idea about potential platform-dependent quirks, so your input would be needed if you need support for such files. Feel free to open an issue or PR.
Modern Fortran also offers “stream-access” which is basically like binary output in C. Julia’s native facilities should have no trouble interfacing with such data.