cs

utils/getddCalcuURL.js

@@ -0,0 +1,74 @@
+const importObj = {
+  a: {
+    a: (a, b, c) => { },
+    b: (a) => { return 0 },
+    c: () => { },
+    d: (a, b, c, d) => { return 0 },
+    e: (a) => { return 0 },
+    f: (a, b, c, d, e) => { return 0 },
+    g: (a, b) => { return 0 },
+    h: (a, b) => { return 0 },
+    i: (a) => { return 0 },
+    j: (a, b, c, d, e) => { return 0 }
+  }
+}
+
+/**
+ * 加密url
+ * @param {string} videoURL - 视频url
+ * @param {Uint8Array} memoryView - 内存
+ * @param {Function} getEncrypt - 加密方法
+ * @returns {string} - 加密地址
+ */
+function encrypt(videoURL, memoryView, getEncrypt) {
+  // 将地址写入内存
+  let i;
+  for (i = 0; i < videoURL.length; ++i) {
+    memoryView[i] = videoURL.charCodeAt(i)
+  }
+  memoryView[i] = 0
+
+  // 加密内存中的url
+  let start = getEncrypt(0)
+
+  // 从内存中读取加密后的url
+  let encryptedURL = ""
+  for (let i = start; memoryView[i] != 0; ++i) {
+    encryptedURL += String.fromCharCode(memoryView[i])
+  }
+  return encryptedURL
+}
+
+
+/**
+ * 初始化wasm
+ * @param {string} masmURL - wasm地址
+ * @returns {object} - wasm导出的内容
+ */
+async function init_wasm(masmURL) {
+  // 获取wasm文件
+  let resp = await fetch(masmURL);
+  // 初始化
+  let { instance } = await WebAssembly.instantiateStreaming(resp, importObj)
+  return instance.exports;
+}
+
+
+
+/**
+ * 获取加密url
+ * @param {object} exports - wasm导出的内容
+ * @param {string} videoURL - 视频地址
+ * @returns {string} - 播放地址
+ */
+function getEncryptURL(exports, videoURL) {
+  // 获得内存
+  const memory = exports.k
+  const memoryView = new Uint8Array(memory.buffer)
+
+  // 获取加密方法
+  const getEncrypt = exports.m
+  return encrypt(videoURL, memoryView, getEncrypt)
+}
+
+export { init_wasm, getEncryptURL }