js-apk-parser/src/util.ts

Parse the AndroidManifest.xml and resources.arsc file in the apk package.

/* utils */
export let uint8ArrayToHex = function(arr: Uint8Array): string {
  return Array.prototype.map.call(arr.slice().reverse(), x => ('00'.concat(x.toString(16))).slice(-2)).join('');
}
export let uint8ArrayToInt = function(arr: Uint8Array): number {
  return (arr[0] & 0xff) | ((arr[1] << 8) & 0xff00)
  | ((arr[2] << 24) >>> 8) | (arr[3] << 24); 
  // return Buffer.from(arr.slice().reverse()).readIntBE(0, arr.length);
}
export let uint8ArrayToShort = function(arr: Uint8Array): number {
  // return Buffer.from(arr.slice().reverse()).readIntBE(0, arr.length);
  let s0: number = (arr[0] & 0xff);
  let s1: number = (arr[1] & 0xff); 
  s1 <<= 8; 
  return (s0 | s1); 
}
export let uint8ArrayToStr = function(array: Uint8Array, utf8: boolean = false): string {
  return new TextDecoder(utf8?'utf-8':'utf-16').decode(array);
}
export let utf8ArrayToStr = function(array: Uint8Array): string {
    let out, i, len, c;
    let char2, char3;

    out = "";
    len = array.length;
    i = 0;
    while(i < len) {
      c = array[i++];
      switch(c >> 4)
      { 
        case 0:
          // trim 0
          break;
        case 1: case 2: case 3: case 4: case 5: case 6: case 7:
          // 0xxxxxxx
          out += String.fromCharCode(c);
          break;
        case 12: case 13:
          // 110x xxxx   10xx xxxx
          char2 = array[i++];
          out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
          break;
        case 14:
          // 1110 xxxx  10xx xxxx  10xx xxxx
          char2 = array[i++];
          char3 = array[i++];
          out += String.fromCharCode(((c & 0x0F) << 12) |
                        ((char2 & 0x3F) << 6) |
                        ((char3 & 0x3F) << 0));
          break;
        default:
          ;
      }
    }

    return out;
}
export let decodeUTF16LE = function(binaryStr ) {
  var cp = [];
  for( var i = 0; i < binaryStr.length; i+=2) {
      cp.push( 
           binaryStr.charCodeAt(i) |
          ( binaryStr.charCodeAt(i+1) << 8 )
      );
  }

  return String.fromCharCode.apply( String, cp );
}