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

import { stringEncode } from "./swf/util.mjs";
import { Tag } from "./swf/tag.mjs";
import { Swf } from "./swf/swf.mjs";
import { concat } from "./util/internal/data.mjs";

/**
 * Type string.
 *
 * @param str The string.
 * @returns Bytecode data.
 */
function asvm1TypeString(str) {
  return concat([new Uint8Array(1), stringEncode(str)]);
}

/**
 * Action: ConstantPoolEnd.
 *
 * @param strs Constant strings.
 * @returns Bytecode data.
 */
function asmv1ActionConstantPool(strs) {
  const data = concat([new Uint8Array(5), ...strs.map(stringEncode)]);
  const v = new DataView(data.buffer, data.byteOffset, data.byteLength);
  data[0] = 0x88;
  v.setUint16(1, data.length - 3, true);
  v.setUint16(3, strs.length, true);
  return data;
}

/**
 * Type constant 8-bit.
 *
 * @param i Constant index.
 * @returns Bytecode data.
 */
function asvm1TypeConstant8(i) {
  const data = new Uint8Array(2);
  data[0] = 0x08;
  data[1] = i;
  return data;
}

/**
 * Action: Push.
 *
 * @param pushed Pushed data.
 * @returns Bytecode data.
 */
function asmv1ActionPush(pushed) {
  const data = concat([new Uint8Array(3), ...pushed]);
  const v = new DataView(data.buffer, data.byteOffset, data.byteLength);
  data[0] = 0x96;
  v.setUint16(1, data.length - 3, true);
  return data;
}

/**
 * Action: LoadMovie.
 *
 * @returns Bytecode data.
 */
function asvm1ActionLoadMovie() {
  const data = new Uint8Array(4);
  const v = new DataView(data.buffer, data.byteOffset, data.byteLength);
  data[0] = 0x9a;
  v.setUint16(1, data.length - 3, true);
  v.setUint8(3, 0x40);
  return data;
}

/**
 * Action: End.
 *
 * @returns Bytecode data.
 */
function asvm1ActionEnd() {
  return new Uint8Array(1);
}

/**
 * Bytecode in SWF4 format.
 *
 * @param url The URL to load.
 * @returns Bytecode data.
 */
function bytecodeLoadMovieSwf4(url) {
  return 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 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 = new Uint8Array(3);
  // eslint-disable-next-line no-bitwise
  setBackgroundColor.data[2] = color & 0xff;
  // eslint-disable-next-line no-bitwise
  setBackgroundColor.data[1] = color >> 8 & 0xff;
  // eslint-disable-next-line no-bitwise
  setBackgroundColor.data[0] = color >> 16 & 0xff;
  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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