128 lines
4.4 KiB
TypeScript
128 lines
4.4 KiB
TypeScript
import { Commands, CommandsByValue, ControlCommands } from "./datatypes.js";
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import { create_P2pRdy, SendStartVideo, SendUsrChk } from "./impl.js";
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import { Session } from "./server.js";
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import { u16_swap } from "./utils.js";
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import { hexdump } from "./hexdump.js";
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let curImage = null;
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export const notImpl = (_: Session, dv: DataView) => {
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const raw = dv.readU16();
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const cmd = CommandsByValue[raw];
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console.log(`^^ ${cmd} (${raw.toString(16)}) and it's not implemented yet`);
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};
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export const noop = (_: Session, __: DataView) => {};
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const create_P2pAliveAck = (): DataView => {
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const outbuf = new DataView(new Uint8Array(4).buffer);
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outbuf.writeU16(Commands.P2PAliveAck);
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outbuf.add(2).writeU16(0);
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return outbuf;
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};
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export const handle_P2PAlive = (session: Session, _: DataView) => {
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const b = create_P2pAliveAck();
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session.send(b);
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};
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export const handle_PunchPkt = (session: Session, dv: DataView) => {
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const punchCmd = dv.readU16();
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const len = dv.add(2).readU16();
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const prefix = dv.add(4).readString(4);
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const serial = dv.add(8).readU64().toString();
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const suffix = dv.add(16).readString(4);
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// f141 20 BATC 609531 EXLV
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session.eventEmitter.emit("connect", prefix.toString() + serial + suffix.toString());
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session.send(create_P2pRdy(dv.add(4).readByteArray(len)));
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};
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export const createResponseForControlCommand = (session: Session, dv: DataView): DataView | null => {
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const start_type = dv.add(8).readU16(); // 0xa11 on control; data starts here on DATA pkt
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const cmd_id = dv.add(10).readU16(); // 0x1120
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if (start_type != 0x110a) {
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console.error(`Expected start_type to be 0xa11, got 0x${start_type.toString(16)}`);
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return;
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}
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if (cmd_id == ControlCommands.ConnectUserAck) {
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let c = new Uint8Array(dv.add(0x14).readByteArray(4).buffer);
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session.ticket[0] = c[0] % 2 == 0 ? c[0] + 1 : c[0] - 1;
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session.ticket[1] = c[1] % 2 == 0 ? c[1] + 1 : c[1] - 1;
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session.ticket[2] = c[2] % 2 == 0 ? c[2] + 1 : c[2] - 1;
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session.ticket[3] = c[3] % 2 == 0 ? c[3] + 1 : c[3] - 1;
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const buf = SendStartVideo(session);
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return buf;
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}
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};
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const deal_with_data = (session: Session, dv: DataView) => {
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const pkt_len = dv.add(2).readU16();
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// data
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const JPEG_HEADER = [0xff, 0xd8, 0xff, 0xdb];
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const AUDIO_HEADER = [0x55, 0xaa, 0x15, 0xa8];
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const m_hdr = dv.add(8).readByteArray(4);
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let is_new_image = true;
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let audio = true;
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for (let i = 0; i < 4; i++) {
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is_new_image = is_new_image && m_hdr.add(i).readU8() == JPEG_HEADER[i];
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audio = audio && m_hdr.add(i).readU8() == AUDIO_HEADER[i];
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}
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if (audio) {
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// "stream_head_t->type == 0x06" per pdf
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if (dv.add(12).readU8() == 0x06) {
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const audio_len = u16_swap(dv.add(8 + 16).readU16());
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const audio_buf = dv.add(32 + 8).readByteArray(audio_len).buffer; // 8 for pkt header, 32 for `stream_head_t`
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session.eventEmitter.emit("audio", Buffer.from(audio_buf));
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} else {
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// not sure what these are for, there's one per frame. maybe alignment?
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}
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} else {
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const data = dv.add(8).readByteArray(pkt_len - 4);
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if (is_new_image) {
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if (curImage != null) {
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session.eventEmitter.emit("frame", curImage);
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}
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curImage = Buffer.from(data.buffer);
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} else {
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curImage = Buffer.concat([curImage, Buffer.from(data.buffer)]);
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}
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}
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};
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const makeDrwAck = (dv: DataView): DataView => {
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const pkt_id = dv.add(6).readU16();
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const m_stream = dv.add(5).readU8(); // data = 1, control = 0
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const item_count = 1; // TODO coalesce acks
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const reply_len = item_count * 2 + 4; // 4 hdr, 2b per item
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const outbuf = new DataView(new Uint8Array(32).buffer);
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outbuf.writeU16(Commands.DrwAck);
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outbuf.add(2).writeU16(reply_len);
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outbuf.add(4).writeU8(0xd2);
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outbuf.add(5).writeU8(m_stream);
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outbuf.add(6).writeU16(item_count);
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for (let i = 0; i < item_count; i++) {
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outbuf.add(8 + i * 2).writeU16(pkt_id);
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}
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return outbuf;
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};
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export const handle_Drw = (session: Session, dv: DataView) => {
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const ack = makeDrwAck(dv);
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session.send(ack);
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const m_stream = dv.add(5).readU8(); // data = 1, control = 0
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if (m_stream == 1) {
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deal_with_data(session, dv);
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} else {
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const b = createResponseForControlCommand(session, dv);
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if (b != null) {
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session.send(b);
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}
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}
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};
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export const handle_P2PRdy = (session: Session, _: DataView) => {
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const b = SendUsrChk("admin", "admin", session.outgoingCommandId);
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session.send(b);
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};
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