oss-upload-browser/src/file-md5.js

oss-browser文件上传

import SparkMD5 from 'spark-md5';
let aborted = false;

export const fileMd5 = (file, md5Fn, progressFn) => {
  let progress = 0;
  let currentChunk = 0;
  const blobSlice = File.prototype.slice;
  const chunkSize = 2097152;
  const chunks = Math.ceil(file.size / chunkSize);
  const spark = new SparkMD5.ArrayBuffer();
  const reader = new FileReader();
  const loadNext = () => {
    const start = currentChunk * chunkSize;
    const end = start + chunkSize >= file.size ? file.size : start + chunkSize;
    reader.readAsArrayBuffer(blobSlice.call(file, start, end));
  };

  loadNext();

  reader.onloadend = e => {
    spark.append(e.target.result); // Append array buffer
    currentChunk++;
    progress = currentChunk / chunks;
    if (progressFn && typeof progressFn === 'function') progressFn(progress);
    if (aborted) return md5Fn('aborted');
    if (currentChunk < chunks) {
      loadNext();
    } else {
      md5Fn(null, spark.end());
    };
  };
};

export const stopMd5 = () => {
  aborted = true;
};