loaders.gl/dist/es6/common/loader-utils/binary-utils.js

Framework-independent loaders for 3D graphics formats

/* global FileReader, Blob, ArrayBuffer, Buffer */
import assert from './assert';
export function toArrayBuffer(binaryData) {
  if (binaryData instanceof ArrayBuffer) {
    return binaryData;
  }

  if (typeof Blob !== 'undefined' && binaryData instanceof Blob) {
    return blobToArrayBuffer(binaryData);
  } // if (ArrayBuffer.isView(binaryData)) {
  //   return binaryData.buffer;
  // }


  return nodeBufferToArrayBuffer(binaryData); // assert(false);
  // return null;
} // Convert (copy) ArrayBuffer to Buffer

export function toBuffer(binaryData) {
  if (ArrayBuffer.isView(binaryData)) {
    binaryData = binaryData.buffer;
  }

  if (typeof Buffer !== 'undefined' && binaryData instanceof ArrayBuffer) {
    /* global Buffer */
    const buffer = new Buffer(binaryData.byteLength);
    const view = new Uint8Array(binaryData);

    for (let i = 0; i < buffer.length; ++i) {
      buffer[i] = view[i];
    }

    return buffer;
  }

  assert(false);
  return null;
} // Helper functions

export function blobToArrayBuffer(blob) {
  return new Promise((resolve, reject) => {
    let arrayBuffer;
    const fileReader = new FileReader();

    fileReader.onload = event => {
      arrayBuffer = event.target.result;
    };

    fileReader.onloadend = event => resolve(arrayBuffer);

    fileReader.onerror = reject;
    fileReader.readAsArrayBuffer(blob);
  });
}

function nodeBufferToArrayBuffer(buffer) {
  // TODO - per docs we should just be able to call buffer.buffer, but there are issues
  const typedArray = new Uint8Array(buffer);
  return typedArray.buffer;
}
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