node-vvvvvv
This is a node package to deal with the custom file formats from Terry Cavanagh's popular game VVVVVV.
Music
There's a file called vvvvvvmusic.vvv in the root of the data.zip found in ytour installation of VVVVVV.
It's a quite simple file format. From the source code:
struct resourceheader
{
char name[48]; // Name of the file, null-terminated
int start; // actually unused, most likely the offset where to find this file, but the code just goes with filesizes and as a result this field contains garbage
int size; // size of the file
bool valid; // 1 if this header block is valid, otherwise it contains garbage and should be ignored
};There is 128 of such header blocks, then every file is concatenated together.
Here's some examples of Node.js code:
const { vvv } = require('vvvvvv');
const fs = require('fs');
// open a file
fs.readFile(filename, (err, data) => {
if(err) throw err;
// read the header and get a list of files
vvv.list(data, (err, files) => {
if(err) throw err;
files.forEach(file => {
console.log("%d\t%s", file.size, file.name);
});
})
// like vvv.list but the callback runs for every file and a buffer is included
vvv.unpack(data, (err, file) => {
if(err) throw err;
fs.writeFile(file.name, file.data, null, (err) => {
if(err) throw err;
console.log(file.name);
});
})
});
var pack = new vvv();
// read some music file or something
fs.readFile("somecustommusic.ogg", (err, data) => {
if(err) throw err;
// file name could be something else entirely,
// do that for every file you have, you might need Promise.all
pack.add("data/music/1pushingonwards.ogg", data, (err) => {
if(err) throw err;
// once you're done save the pack
pack.pack((err, buf) => {
if(err) throw err.message;
fs.writeFile("newfile.vvv", buf, null, (err) => {
if(err) throw err;
console.log("writing newfile.vvv");
});
})
});
})If you don't care about code and just want to go ahead and replace the music, there's also a command-line interface, similar to most compressor utilities:
$ npm install -g vvvvvv
$ vvv -l vvvvvvmusic.vvv # list the files
File: vvvvvvmusic.vvv, size: 61651755
vvv data size: 61644075, number of entries: 16
214810 data/music/0levelcomplete.ogg
4935877 data/music/1pushingonwards.ogg
3711106 data/music/2positiveforce.ogg
6592605 data/music/3potentialforanything.ogg
4066428 data/music/4passionforexploring.ogg
231578 data/music/5intermission.ogg
4067664 data/music/6presentingvvvvvv.ogg
477481 data/music/7gamecomplete.ogg
3839409 data/music/8predestinedfate.ogg
3568983 data/music/9positiveforcereversed.ogg
8785077 data/music/10popularpotpourri.ogg
3254064 data/music/11pipedream.ogg
4823877 data/music/12pressurecooker.ogg
3682137 data/music/13pacedenergy.ogg
5502597 data/music/14piercingthesky.ogg
3890382 data/music/predestinedfatefinallevel.ogg
$ vvv -x vvvvvvmusic.vvv # extract them
$ vvv -c newfile.vvv data/music/* # create a new packNote that VVVVVV wants at least exactly these filenames, but there's nothing keeping you from including other files (such as a readme) or reusing the file format for your own thing.
Levels
coming soon
