An adaptation of https://gist.github.com/cxx/6d1d44ce4a6107ed80e0a6c8c5b887c4 for the Atari 50: The Anniversary Celebration

atari502mame.js

// atari502mame.js - convert some of the arcade game data in Atari 50: The Anniversary Celebration to older MAME ROM sets
//
// Usage:
//   node atari502mame.js [ROM directory]
//
// Requirements:
// - Node.js v6 or later
// - [Microsoft Windows] .NET Framework 4.5 or later (included in Windows 8/10)
// - [Linux] /usr/bin/zip
//
// Supported (libretro core):
// - Asteroids (MAME 2003)
// - Asteroids Deluxe (MAME 2003)
// - Missile Command (MAME 2003, loads with warnings, but appears playable)
// - Tempest (MAME 2003)
//
// Only partially extracted:
// - Black Widow (MAME 2003, unplayable)
// - Gravitar (MAME 2003, unplayable)
// - Lunar Lander (MAME 2003, unplayable)
// - Space Duel (MAME 2003, unplayable)
//
// Not supported:
// - AkkaArrh
// - Centipede
// - Cloak and Dagger
// - Crystal Castles
// - Liberator
// - Major Havok
// - MazeInvaders
// - Millipede
// - Super Breakout
// - Warlords
//
// Changelog:
// - 2022-12-12: Adapt Atari Vault script for Atari 50: The Anniversary Celebration
// - 2017-12-20: Place dummy files for missing ROMs.
// - 2017-04-24: Initial release.

const child_process = require('child_process');
const fs = require('fs');
const os = require('os');
const path = require('path');

function split(buf, size)
{
    const ret = [];
    for (let i = 0; i < buf.length; i += size)
        ret.push(buf.slice(i, Math.min(i+size,buf.length)));
    return ret;
}

function split_at(buf, ...pos)
{
    const ret = [];
    pos = [0, ...pos, buf.length];
    for (let i = 1; i < pos.length; i++)
        ret.push(buf.slice(pos[i-1], pos[i]));
    return ret;
}

function reverse_bmp(buf)
{
    const off_bits = buf.readUInt32LE(10);
    const width = buf.readUInt32LE(14+4);
    const height = buf.readUInt32LE(14+8);
    const ret = Buffer.allocUnsafe(width * height);
    for (let i = 0; i < height; i++) {
        const src_start = off_bits + width * (height-1-i);
        buf.copy(ret, width*i, src_start, src_start+width);
    }
    return ret;
}

function split_nibbles(buf)
{
    const upper = Buffer.allocUnsafe(buf.length);
    const lower = Buffer.allocUnsafe(buf.length);
    for (let i = 0; i < buf.length; i++) {
        upper[i] = buf[i] >> 4 & 0xf;
        lower[i] = buf[i] >> 0 & 0xf;
    }
    return [upper, lower];
}

function encode_gfx(buf, layout)
{
    const np = layout.planes;
    const dest = Buffer.alloc(buf.length * np / 8);

    if (Array.isArray(layout.total)) {
        const [num, den] = layout.total;
        layout = Object.assign({}, layout, {
            total: dest.length * 8 / layout.charincrement * num / den,
            planeoffset: layout.planeoffset.map(x => {
                if (Array.isArray(x)) {
                    let [num, den, add] = x;
                    add = add || 0;
                    return dest.length * 8 * num / den + add;
                }
                else
                    return x;
            })
        });
    }

    let i = 0;
    for (let c = 0; c < layout.total; c++) {
        const charoffset = layout.charincrement * c;
        for (let y = 0; y < layout.height; y++) {
            const yoffset = charoffset + layout.yoffset[y];
            for (let x = 0; x < layout.width; x++) {
                const xoffset = yoffset + layout.xoffset[x];
                for (let p = 0; p < np; p++) {
                    const offset = xoffset + layout.planeoffset[p];
                    dest[offset >> 3] |=
                        ((buf[i] >> np-1-p) & 1) << (~offset & 7);
                }
                i++;
            }
        }
    }
    return dest;
}

function zip(name, dir)
{
    let cmd;
    if (os.type() === 'Windows_NT')
        cmd = `powershell Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::CreateFromDirectory('${dir}', '${name}.zip')`;
    else
        cmd = `zip -j ${name}.zip ${dir}/*`;
    child_process.execSync(cmd);
}

function convert_roms(name, srcdir, maps)
{
    const bins = {};
    for (const region in maps) {
        const map = maps[region];
        let bin;
        if (map.input instanceof Buffer)
            bin = map.input;
        else {
            let file;
            let layout;
            if (typeof map.input === 'string')
                file = map.input;
            else
                ({file, layout} = map.input);
            bin = fs.readFileSync(path.join(srcdir, file));
            if (layout)
                bin = encode_gfx(bin, layout);
        }
        if (map.transform)
            bin = map.transform(bin);
        bins[region] = bin;
    }

    const dstdir = fs.mkdtempSync(path.join(os.tmpdir(), name));
    for (const region in maps) {
        let bin = bins[region];
        let {output} = maps[region];
        if (typeof output === 'string') {
            output = [output];
            bin = [bin];
        }
        if (!Array.isArray(bin))
            bin = split(bin, bin.length/output.length);
        for (let i = 0; i < output.length; i++)
            fs.writeFileSync(path.join(dstdir, output[i]), bin[i]);
    }
    zip(name, dstdir);
    for (const f of fs.readdirSync(dstdir))
        fs.unlinkSync(path.join(dstdir, f));
    fs.rmdirSync(dstdir);
    console.log(`saved as ${name}.zip.`);
}

// from https://github.com/mamedev/mame/blob/b888b8c4edaeccea889b97e1c2df6f914ae6e303/src/mame/drivers/sprint2.cpp
// license:BSD-3-Clause
// copyright-holders:Mike Balfour
const SPRINT2_TILE_LAYOUT = {
  width: 8,
  height: 8,
  total: 64,
  planes: 1,
  planeoffset: [0],
  xoffset: [0, 1, 2, 3, 4, 5, 6, 7],
  yoffset: [0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38],
  charincrement: 0x40
};

const SPRINT2_CAR_LAYOUT = {
  width: 16,
  height: 8,
  total: 32,
  planes: 1,
  planeoffset: [0],
  xoffset: [0x7, 0x6, 0x5, 0x4, 0x3, 0x2, 0x1, 0x0,
	    0xf, 0xe, 0xd, 0xc, 0xb, 0xa, 0x9, 0x8],
  yoffset: [0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70],
  charincrement: 0x80
};

function asteroid_mame2003(srcdir)
{
    convert_roms('asteroid', srcdir, {
        cpu1: {
            input: 'Asteroids.rom',
            output: ['035145.02', '035144.02', '035143.02', '035127.02']
        }
    });
}

function astdelux_mame2003(srcdir)
{
    convert_roms('astdelux', srcdir, {
        cpu1: {
            input: 'AsteroidsDeluxe.rom',
            output: ['036430.02', '036431.02', '036432.02',
                     '036433.03', '036800.02', '036799.01']
        }
    });
}

function bwidow_mame2003(srcdir)
{
    convert_roms('bwidow', srcdir, {
        cpu1: { // wrong checksums
            input: 'BlackWidow.rom',
            output: ['136017.107', '136017.108', '136017.109', '136017.110',
                     '136017.101', '136017.102', '136017.103', '136017.104',
                     '136017.105', '136017.106'],
            transform: bin => {
                const a = split_at(bin, 0x0800);
                return [a[0], ...split(a[1], 0x1000)];
            }
        }
    });
}

function gravitar_mame2003(srcdir)
{
    convert_roms('gravitar', srcdir, {
        cpu1: {
            input: 'Gravitar.rom',
            output: ['136010.210', '136010.207', '136010.208', '136010.309',
                     '136010.301', '136010.302', '136010.303', '136010.304',
                     '136010.305', '136010.306'],
            transform: bin => {
                const a = split_at(bin, 0x0800);
                return [a[0], ...split(a[1], 0x1000)];
            }
        }
    });
}

function llander_mame2003(srcdir)
{
    convert_roms('llander', srcdir, {
        cpu1: {
            input: 'LunarLander.rom',
            output: ['034599.01', '034598.01', '034597.01', '034572.02',
                     '034571.02', '034570.01', '034569.02']
        }
    });
}

function missile_mame2003(srcdir)
{
    convert_roms('missile', srcdir, {
        cpu1: {
            input: 'MissileCommand.rom',
            output: ['035820.02', '035821.02', '035822.02',
                     '035823.02', '035824.02', '035825.02']
        }
    });
}

function spacduel_mame2003(srcdir)
{
    convert_roms('spacduel', srcdir, {
        cpu1: {
            input: 'SpaceDuel.rom',
            output: ['136006.106', '136006.107', '136006.201', '136006.102',
                     '136006.103', '136006.104', '136006.105'],
            transform: bin => {
                const a = split_at(bin, 0x0800);
                return [a[0], ...split(a[1], 0x1000)];
            }
        }
    });
}

function tempest3_mame2003(srcdir)
{
    convert_roms('tempest3', srcdir, {
        cpu1: {
            input: 'Tempest.rom',
            output: ['237.002', '136.002', '235.002',
                     '134.002', '133.002', '138.002']
        }
    });
}

const srcdir = process.argv[2] || '';
if (fs.existsSync(path.join(srcdir, 'Asteroids.rom'))) {
    asteroid_mame2003(srcdir);
    astdelux_mame2003(srcdir);
    bwidow_mame2003(srcdir);
    gravitar_mame2003(srcdir);
    llander_mame2003(srcdir);
    missile_mame2003(srcdir);
    spacduel_mame2003(srcdir);
    tempest3_mame2003(srcdir);
}
else
    console.log('Usage: node atari502mame.js [ROM directory]');