ssf.js

// reference: https://github.com/KDE/kimtoy/blob/master/kssf.cpp

const crypto = require('crypto');
const zlib = require('zlib');
const fs = require('fs');

let aes = crypto.createDecipheriv('aes-256-cbc', Buffer.from([
        0x52,0x36,0x46,0x1A,0xD3,0x85,0x03,0x66,
        0x90,0x45,0x16,0x28,0x79,0x03,0x36,0x23,
        0xDD,0xBE,0x6F,0x03,0xFF,0x04,0xE3,0xCA,
        0xD5,0x7F,0xFC,0xA3,0x50,0xE4,0x9E,0xD9
    ]), Buffer.from([
        0xE0,0x7A,0xAD,0x35,0xE0,0x90,0xAA,0x03,
        0x8A,0x51,0xFD,0x05,0xDF,0x8C,0x5D,0x0F
    ])
);

let data = Buffer.alloc(0);
process.stdin.on('data', newdata => {
    data = Buffer.concat([data, newdata]);
});
process.stdin.on('end', () => dowork());

function dowork() {
    data = data.slice(8);
    data = Buffer.concat([aes.update(data), aes.final()]);
    data = data.slice(4);
    data = zlib.inflateSync(data);
    let size = data.readUInt32LE(0);
    let offtb = data.readUInt32LE(4);
    let offcnt = offtb / 4;
    let offsets = []
    for (let i = 0; i < offcnt; i++) {
        let off = data.readUInt32LE(8 + i * 4);
        offsets.push(off);
    }
    for (let off of offsets) {
        let namelen = data.readUInt32LE(off); off += 4;
        let name = data.slice(off, off + namelen).toString('utf16le'); off += namelen;
        let contentlen = data.readUInt32LE(off); off += 4;
        let content = data.slice(off, off + contentlen);
        fs.writeFileSync(name, content);
    }
}