@infinito/id3/lib/gen.js

ID3 Tag Reader/Writer

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = genID3;

var _textEncoding = require("text-encoding");

var _constants = require("./constants.js");

var _id3tag = _interopRequireDefault(require("./classes/id3tag.js"));

var _id = _interopRequireDefault(require("./gen/id3.2.3.js"));

var _setSyncsafe = _interopRequireDefault(require("./set.syncsafe.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function genID3(tags) {
  if (!(tags instanceof _id3tag.default)) {
    throw new TypeError("tags not of type id3Tag");
  }

  var header = new Uint8Array(_constants.constants.ID3_HEADER_LENGTH_BYTES);

  for (var i = 0; i < _constants.constants.ID3_HEADER_IDENTIFIER_LENGTH_BYTES; i++) {
    header[i] = _constants.constants.ID3_HEADER_IDENTIFIER[i];
  }

  var pos = _constants.constants.ID3_HEADER_IDENTIFIER_LENGTH_BYTES;
  header[pos] = tags.ver;
  pos++;
  header[pos] = tags.subVer;
  pos++;
  header[pos] = tags.flags;
  pos++;

  switch (tags.ver) {
    case 4:
      throw new Error("id3v2.4." + subver + " not supported");
      break;

    case 3:
      var frames = (0, _id.default)(tags);
      var len = _constants.constants.ID3_HEADER_LENGTH_BYTES;

      for (var i in frames) {
        len += frames[i].byteLength;
      }

      (0, _setSyncsafe.default)(header, pos, len - _constants.constants.ID3_HEADER_LENGTH_BYTES, _constants.constants.ID3V2_3_FRAME_SIZE_BYTES);
      pos += _constants.constants.ID3V2_3_FRAME_SIZE_BYTES;
      var buf = new Uint8Array(len);

      for (var i = 0; i < _constants.constants.ID3_HEADER_LENGTH_BYTES; i++) {
        buf[i] = header[i];
      }

      for (var i in frames) {
        len = frames[i].byteLength;

        for (var j = 0; j < len; j++) {
          buf[pos + j] = frames[i][j];
        }

        pos += len;
      }

      return buf;

    default:
      throw new Error("id3v" + tags.ver + "." + tags.subver + " not supported");
      return;
  }

  var path = new _textEncoding.TextEncoder().encode(tags.path);
  var sz = path.byteLength;

  if (sz > 0xffff) {
    console.error(tags);
    throw new Error("Path is too long");
    return;
  }

  var pathbuf = new Uint8Array(2 + sz);
  pathbuf[0] = (sz & 0xff00) >> 16;
  pathbuf[1] = sz & 0xff;

  for (var i = 0; i < path.byteLength; i++) {
    pathbuf[2 + i] = path[i];
  }

  var res = new Uint8Array(pathbuf.byteLength + buf.byteLength);

  for (var i = 0; i < pathbuf.byteLength; i++) {
    res[i] = pathbuf[i];
  }

  for (var j = 0; j < buf.byteLength; j++) {
    res[i + j] = buf[j];
  }

  return res;
}

;