xo-vmdk-to-vhd/dist/parseVhdToBlocks.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.parseVhdToBlocks = parseVhdToBlocks;
var _assert = _interopRequireDefault(require("assert"));
var _parseVhdStream = require("vhd-lib/parseVhdStream.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
async function next(iterator, type, skipableType) {
  let item;
  do {
    const cursor = await iterator.next();
    _assert.default.strictEqual(cursor.done, false, 'iterator is done');
    item = cursor.value;
  } while (item.type === skipableType);
  _assert.default.strictEqual(item.type, type);
  return item;
}
async function* onlyBlocks(iterable, blockSize) {
  for await (const item of iterable) {
    if (item.type === 'block') {
      const {
        id,
        data
      } = item;
      yield {
        lba: id * blockSize,
        block: data
      };
    }
  }
}
async function parseVhdToBlocks(vhdStream) {
  const iterator = (0, _parseVhdStream.parseVhdStream)(vhdStream);
  const {
    footer
  } = await next(iterator, 'footer');
  const {
    header
  } = await next(iterator, 'header');
  const {
    blockCount
  } = await next(iterator, 'bat', 'parentLocator');
  return {
    blockSize: header.blockSize,
    blockCount,
    diskSize: footer.currentSize,
    geometry: footer.diskGeometry,
    blocks: onlyBlocks(iterator, header.blockSize)
  };
}
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