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export class TASD {
static MAGIC = new Uint8Array([0x54, 0x41, 0x53, 0x44]);
public version: number;
public g_keylen: number;
public packets: TASDPacket[];
constructor(_version: number, _keylen: number) {
this.version = _version;
this.g_keylen = _keylen;
this.packets = [];
}
static parseFile(buffer: Uint8Array) {
if (buffer.length < 7) throw new Error('Input Too Short');
for (let i = 0; i < TASD.MAGIC.length; i++) {
if (buffer[i] !== TASD.MAGIC[i]) throw new Error('Invalid Magic Bytes');
}
const version = readUint16(buffer, 4);
if (version !== 1) throw new Error('Unsupported Version');
const g_keylen = readUint8(buffer, 6);
if (g_keylen !== 2) throw new Error('G_KEYLEN not equal to 2, unsupported');
const file = new TASD(version, g_keylen);
let index = 7;
while (index < buffer.length) {
const p_key = readUintN(buffer, index, g_keylen);
index += g_keylen;
const p_pexp = readUint8(buffer, index);
index += 1;
const p_plen = readUintN(buffer, index, p_pexp);
index += p_pexp;
const p_payload = buffer.subarray(index, index+p_plen);
index += p_plen;
file.packets.push({ type: p_key, payload: p_payload });
}
return file;
}
toBuffer() {
let size = 7; // Header
for (const packet of this.packets) {
size += this.g_keylen; // Packet Key
size += 1; // Packet PEXP
size += minUInt(packet.payload.length); // Packet PLen
size += packet.payload.length;
}
const buffer = new Uint8Array(size);
buffer.set(TASD.MAGIC, 0);
writeUint16(this.version, buffer, 4);
writeUint8(this.g_keylen, buffer, 6);
let index = 7;
for (const packet of this.packets) {
writeUintN(packet.type, buffer, index, this.g_keylen);
index += this.g_keylen;
const plen = packet.payload.length;
const pexp = minUInt(plen);
writeUint8(pexp, buffer, index);
index += 1;
writeUintN(plen, buffer, index, pexp);
index += pexp;
buffer.set(packet.payload, index);
index += plen;
}
return buffer;
}
pprint() {
console.log('VERSION', this.version);
console.log('G_KEYLEN', this.g_keylen);
for (const packet of this.packets) {
console.log('PACKET', packetName(packet.type), packet.payload.length, 'Bytes');
}
}
compactInputs() {
if (this.packets.some(packet => packet.type === PACKET_TYPES.INPUT_MOMENT)) return;
const otherPackets = this.packets.filter(packet => packet.type !== PACKET_TYPES.INPUT_CHUNK);
const inputPackets = this.packets.filter(packet => packet.type === PACKET_TYPES.INPUT_CHUNK);
const ports: Uint8Array[][] = [];
for (const packet of otherPackets.filter(packet => packet.type === PACKET_TYPES.PORT_CONTROLLER)) {
ports[packet.payload[0]] = [];
}
for (const packet of inputPackets) {
ports[packet.payload[0]].push(packet.payload.subarray(1));
}
for (let port = 1; port < 256; port++) {
if (ports[port]) {
const portN = new Uint8Array([port]);
otherPackets.push({ type: PACKET_TYPES.INPUT_CHUNK, payload: concatUint8Array([portN, ...ports[port]]) });
}
}
this.packets = otherPackets;
}
}
export type TASDPacket = {
type: number;
payload: Uint8Array;
}
export const PACKET_TYPES = {
// General Keys
'CONSOLE_TYPE': 0x00_01,
'CONSOLE_REGION': 0x00_02,
'GAME_TITLE': 0x00_03,
'ROM_NAME': 0x00_04,
'ATTRIBUTION': 0x00_05,
'CATEGORY': 0x00_06,
'EMULATOR_NAME': 0x00_07,
'EMULATOR_VERSION': 0x00_08,
'EMULATOR_CORE': 0x00_09,
'TAS_LAST_MODIFIED': 0x00_0A,
'DUMP_CREATED': 0x00_0B,
'DUMP_LAST_MODIFIED': 0x00_0C,
'TOTAL_FRAMES': 0x00_0D,
'RERECORDS': 0x00_0E,
'SOURCE_LINK': 0x00_0F,
'BLANK_FRAMES': 0x00_10,
'VERIFIED': 0x00_11,
'MEMORY_INIT': 0x00_12,
'GAME_IDENTIFIER': 0x00_13,
'MOVIE_LICENSE': 0x00_14,
'MOVIE_FILE': 0x00_15,
'PORT_CONTROLLER': 0x00_F0,
// NES Specific Keys
'NES_LATCH_FILTER': 0x01_01,
'NES_CLOCK_FILTER': 0x01_02,
'NES_OVERREAD': 0x01_03,
'NES_GAME_GENIE_CODE': 0x01_04,
// SNES Specific Keys
'SNES_CLOCK_FILTER': 0x02_02,
'SNES_OVERREAD': 0x02_03,
'SNES_GAME_GENIE_CODE': 0x02_04,
'SNES_LATCH_TRAIN': 0x02_05,
// Genesis Specific Keys
'GENESIS_GAME_GENIE_CODE': 0x08_04,
// Input Frame/Timing Keys
'INPUT_CHUNK': 0xFE_01,
'INPUT_MOMENT': 0xFE_02,
'TRANSITION': 0xFE_03,
'LAG_FRAME_CHUNK': 0xFE_04,
'MOVIE_TRANSITION': 0xFE_05,
// Extraneous Keys
'COMMENT': 0xFF_01,
'EXPERIMENTAL': 0xFF_FE,
'UNSPECIFIED': 0xFF_FF,
} as const;
export function packetName(key: number) {
for (const name of Object.keys(PACKET_TYPES)) {
if (PACKET_TYPES[name as keyof typeof PACKET_TYPES] === key) return name;
}
return 'Unknown Packet ' + key.toString(16).toUpperCase();
}
export function readUint8(buffer: Uint8Array, index: number) {
return buffer[index];
}
export function readUint16(buffer: Uint8Array, index: number) {
return (buffer[index] << 8) + buffer[index+1];
}
export function readUint24(buffer: Uint8Array, index: number) {
return (buffer[index] << 16) + (buffer[index+1] << 8) + buffer[index+2];
}
export function readUint32(buffer: Uint8Array, index: number) {
return (buffer[index] << 24) + (buffer[index+1] << 16) + (buffer[index+2] << 8) + buffer[index+3];
}
export function readUintN(buffer: Uint8Array, index: number, n: number) {
switch (n) {
case 1: return readUint8(buffer, index);
case 2: return readUint16(buffer, index);
case 3: return readUint24(buffer, index);
case 4: return readUint32(buffer, index);
default: throw new Error('Unsupported UInt size');
}
}
export function writeUint8(uint: number, buffer: Uint8Array, index: number) {
buffer[index] = uint & 0xFF;
}
export function writeUint16(uint: number, buffer: Uint8Array, index: number) {
buffer[index] = (uint & 0xFF00) >> 8;
buffer[index+1] = uint & 0xFF;
}
export function writeUint24(uint: number, buffer: Uint8Array, index: number) {
buffer[index] = (uint & 0xFF0000) >> 16;
buffer[index+1] = (uint & 0xFF00) >> 8;
buffer[index+2] = uint & 0xFF;
}
export function writeUint32(uint: number, buffer: Uint8Array, index: number) {
buffer[index] = (uint & 0xFF000000) >> 24;
buffer[index+1] = (uint & 0xFF0000) >> 16;
buffer[index+2] = (uint & 0xFF00) >> 8;
buffer[index+3] = uint & 0xFF;
}
export function writeUintN(uint: number, buffer: Uint8Array, index: number, size: number) {
switch (size) {
case 1: return writeUint8(uint, buffer, index);
case 2: return writeUint16(uint, buffer, index);
case 3: return writeUint24(uint, buffer, index);
case 4: return writeUint32(uint, buffer, index);
default: throw new Error('Unsupported UInt size');
}
}
export function minUInt(uint: number) {
if (uint < 256) return 1;
if (uint < 65536) return 2;
if (uint < 16777216) return 3;
if (uint < 4294967296) return 4;
throw new Error('Unsupported UInt size');
}
export function concatUint8Array(arrays: Uint8Array[]): Uint8Array {
let size = 0;
for (const array of arrays) {
size += array.length;
}
const buffer = new Uint8Array(size);
let index = 0;
for (const array of arrays) {
buffer.set(array, index);
index += array.length;
}
return buffer;
}
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