@shockpkg/swf-projector/lib/loader.mjs

import { stringToCStr } from "./swf/util.mjs";
import { Tag } from "./swf/tag.mjs";
import { Swf } from "./swf/swf.mjs";
/**
 * Type string.
 *
 * @param str The string.
 * @returns Bytecode data.
 */

function asvm1TypeString(str) {
  return Buffer.concat([Buffer.alloc(1), stringToCStr(str)]);
}
/**
 * Action: ConstantPoolEnd.
 *
 * @param strs Constant strings.
 * @returns Bytecode data.
 */


function asmv1ActionConstantPool(strs) {
  const data = Buffer.concat([Buffer.alloc(5), ...strs.map(stringToCStr)]);
  data.writeUInt8(0x88, 0);
  data.writeUInt16LE(data.length - 3, 1);
  data.writeUInt16LE(strs.length, 3);
  return data;
}
/**
 * Type constant 8-bit.
 *
 * @param i Constant index.
 * @returns Bytecode data.
 */


function asvm1TypeConstant8(i) {
  const data = Buffer.alloc(2);
  data.writeUInt8(0x08, 0);
  data.writeUInt8(i, 1);
  return data;
}
/**
 * Action: Push.
 *
 * @param pushed Pushed data.
 * @returns Bytecode data.
 */


function asmv1ActionPush(pushed) {
  const data = Buffer.concat([Buffer.alloc(3), ...pushed]);
  data.writeUInt8(0x96, 0);
  data.writeUInt16LE(data.length - 3, 1);
  return data;
}
/**
 * Action: LoadMovie.
 *
 * @returns Bytecode data.
 */


function asvm1ActionLoadMovie() {
  const data = Buffer.alloc(4);
  data.writeUInt8(0x9A, 0);
  data.writeUInt16LE(data.length - 3, 1);
  data.writeUInt8(0x40, 3);
  return data;
}
/**
 * Action: End.
 *
 * @returns Bytecode data.
 */


function asvm1ActionEnd() {
  return Buffer.alloc(1);
}
/**
 * Bytecode in SWF4 format.
 *
 * @param url The URL to load.
 * @returns Bytecode data.
 */


function bytecodeLoadMovieSwf4(url) {
  return Buffer.concat([asmv1ActionPush([asvm1TypeString(url)]), asmv1ActionPush([asvm1TypeString('/')]), asvm1ActionLoadMovie(), asvm1ActionEnd()]);
}
/**
 * Bytecode in SWF5 format.
 *
 * @param url The URL to load.
 * @returns Bytecode data.
 */


function bytecodeLoadMovieSwf5(url) {
  return Buffer.concat([asmv1ActionConstantPool([url, '_level0']), asmv1ActionPush([asvm1TypeConstant8(0), asvm1TypeConstant8(1)]), asvm1ActionLoadMovie(), asvm1ActionEnd()]);
}
/**
 * Generate a loader stub SWF movie.
 * Optionally include a delay to give player a change to initialize first.
 *
 * @param swfv SWF format version number.
 * @param width Frame width.
 * @param height Frame height.
 * @param fps Frames-per-second.
 * @param color Background color.
 * @param url The URL to load.
 * @param delay Number of frame to delay loading.
 * @returns Movie data.
 */


export function loader(swfv, width, height, fps, color, url, delay = 0) {
  if (swfv < 4) {
    throw new Error('SWF format version must be 4+');
  }

  delay = delay < 0 ? 0 : delay;
  const swf = new Swf();
  swf.version = swfv;
  swf.frameSize.xMax = Math.round(width * 20);
  swf.frameSize.yMax = Math.round(height * 20);
  swf.frameRate.value = fps;
  swf.frameCount = delay + 1;
  const setBackgroundColor = new Tag();
  setBackgroundColor.code = 9;
  setBackgroundColor.data = Buffer.alloc(3); // eslint-disable-next-line no-bitwise

  setBackgroundColor.data.writeUInt8(color & 0xFF, 2); // eslint-disable-next-line no-bitwise

  setBackgroundColor.data.writeUInt8(color >> 8 & 0xFF, 1); // eslint-disable-next-line no-bitwise

  setBackgroundColor.data.writeUInt8(color >> 16 & 0xFF, 0);
  swf.tags.push(setBackgroundColor);
  const showFrame = new Tag();
  showFrame.code = 1;

  for (let i = 0; i < delay; i++) {
    swf.tags.push(showFrame);
  }

  const doAction = new Tag();
  doAction.code = 12;
  doAction.data = swfv < 5 ? bytecodeLoadMovieSwf4(url) : bytecodeLoadMovieSwf5(url);
  swf.tags.push(doAction);
  swf.tags.push(showFrame);
  const end = new Tag();
  end.code = 0;
  swf.tags.push(end);
  return swf.encode();
}
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