README

rsc-archiver

compress and decompress runescape classic .jag/.mem cache files. these files contain a proprietary header describing the size of the archive, and of each individual entry (file). filenames are stored with a "hash" so it's impossible to recover the originals without bruteforcing (unless they're under ~5 characters).

this module works in the browser and node.

install

$ npm install @2003scape/rsc-archiver # -g for CLI program

cli usage

rsc-archiver <command>

Commands:
  rsc-archiver x <archive> <files..>  extract a file from an archive
                                                              [aliases: extract]
  rsc-archiver a <archive> <files..>  add files to an archive     [aliases: add]
  rsc-archiver d <archive> <files..>  remove files from an archive
                                                               [aliases: delete]
  rsc-archiver l <archive>            list hashes and file sizes in an archive
                                                                 [aliases: list]
  rsc-archiver h <name>               return the integer hash of a filename
                                      string                     [aliases: hash]

Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]

example

const fs = require('fs');
const { JagArchive } = require('./src');

let rawJag = fs.readFileSync('./data204/sounds1.mem');
let archive = new JagArchive();
archive.readArchive(rawJag);
console.log(`cache has ${archive.entries.size} files`);
fs.writeFileSync('death.pcm', archive.getEntry('death.pcm'));

const testArchive = new JagArchive();
testArchive.putEntry('test.txt', Buffer.from('test string'));
fs.writeFileSync('./data204/test.jag', testArchive.toArchive(true));

rawJag = fs.readFileSync('./data204/test.jag');
archive = new JagArchive();
archive.readArchive(rawJag);
console.log(`cache has ${archive.entries.size} files`);
console.log(archive.getEntry('test.txt').toString());

api

archive.entries

Map of hashes -> decompressed file buffers.

archive = new JagArchive()

create a new jag (de)compressor instance.

archive.readArchive(buffer)

decompress buffer and populate entries with each file within.

archive.hasEntry(name)

check if archive contains entry based on hash or filename.

archive.getEntry(name)

return entry based on name or hash.

archive.putEntry(name, buffer)

add a file to the archive buffer.

archive.removeEntry(name)

remove entry based on name or hash.

archive.toArchive(individualCompress=true)

compress entries to a jagex archive. if individualCompress is true, bzip each file separately. otherwise, concatinate all of the files and then bzip that result instead.

license

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Usage no npm install needed!