arraybuffer

SharedArrayBuffer对象 SharedArrayBuffer 对象用来表示一个通用的，固定长度的原始二进制数据缓冲区，类似于 ArrayBuffer 对象，它们都可以用来在共享内存（shared memory）上创建视图。与 ArrayBuffer 不同的是，SharedArrayBuffer 不能被分离。 语法 new SharedArrayBuffer(length) 参数length指所创建的数组缓冲区的大小，以字节(byte)为单位。 需要new运算符构造 // 创建一个1024字节的缓冲 let sab = new SharedArrayBuffer ( 1024 ) ; MDN文档 Atomics对象 Atomics 对象提供了一组静态方法用来对 SharedArrayBuffer 对象进行原子操作。 这些原子操作属于 Atomics 模块。与一般的全局对象不同，Atomics 不是构造函数，因此不能使用 new 操作符调用，也不能将其当作函数直接调用。Atomics 的所有属性和方法都是静态的（与 Math 对象一样）。 多个共享内存的线程能够同时读写同一位置上的数据。原子操作会确保正在读或写的数据的值是符合预期的，即下一个原子操作一定会在上一个原子操作结束后才会开始，其操作过程不会中断。 注意

I read a file using FileReader.readAsArrayBuffer and then do something like this: var compressedData = pako.gzip(new Uint8Array(this.result)); var blob1 = new Blob([compressedData]); // size = 1455338 bytes var blob2 = new Blob(compressedData); // size = 3761329 bytes As an example: if result has 4194304 bytes, after compression it will be size 1455338 bytes. But for some reason the Uint8Array needs to be wrapped in an Array. Why is this? Cf. documentation for BLOB constructor: https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob [the first argument] is an Array of ArrayBuffer,

Situation : Client js sends ajax request to nodejs express server. Client xmlHttpRequest=new XMLHttpRequest(); xmlHttpRequest.open("POST","/some/server/path,true); xmlHttpRequest.responseType="arraybuffer"; xmlHttpRequest.send(new Uint8Array(arraybufferobject)); Server(so far) var express = require('express'); var server = express(); server.use(express.static(__dirname)); server.use(express.bodyParser()); server.post('/goforms/modbus/',function(req,res,next){ //How to access the uint8array || arraybuffer ? }); server.listen(80); Im stuck at this point. How to access the HTTP POST data? The

问题： 你如何选择一个通用的可变序列在你的Scala应用中。 解决： 正像Vector被推荐作为不可变序列容器的指定类，ArrayBuffer则被推荐作为通用的可变序列容器指定类。（ArrayBuffer是带索引的序列容器，如果你想使用链式序列容器，可以使用ListBuffer） 在使用ArrayBuffer之前你必须先引入它： scala> import scala.collection.mutable.ArrayBuffer import scala.collection.mutable.ArrayBuffer 接下来你就可以创建一个空的ArrayBuffer： scala> var fruits = ArrayBuffer[String]() fruits: scala.collection.mutable.ArrayBuffer[String] = ArrayBuffer() scala> var ints = ArrayBuffer[Int]() ints: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer() 或者，你也可以创建带有初始化数据的ArrayBuffer： scala> var numbers = ArrayBuffer(1,2,3) numbers: scala.collection

This is my line of code. var xhr = new XMLHttpRequest(); xhr.open('GET',window.location.href, true); xhr.responseType = "arraybuffer"; xhr.onload = function(event) { debugger; console.log(" coverting array buffer to string "); alert(String.fromCharCode.apply(null, new Uint8Array(this.response))); }; xhr.send(); That request is making to a pdf url which is around 3 MB in size. Read few thread with same error, telling that there must be some recursive call but I do not see any recursive call here. Any help ? le_m The error is caused by a limitation in the number of function arguments. See

I'm trying to use Web Workers to process large volumes of data, and when passing data back to the main thread for display, I would like to use a transferable object to reduce the impact on the UI thread. The procedure currently results in a multi dimensional array that can also contain objects. For instance: [{foo: [{bar: "Alice", car: 23, dab: [2, 3, 5]}], faa: [{moo: {a: [2,3], b: [4,5]} }, {moo: {a: [6,7], b: [8,9]} }]}, {foo: [{bar: "John", car: 33, dab: [6, 7, 1]}], faa: [{moo: {a: [5,5], b: [9,2]} }, {moo: {a: [7,7], b: [4,2]} }]}, ...] I have seen this string conversion post, but again,

I'm using a web-worker to load a .json file of an animated 3D model. For each of the big arrays (vertices, normals, etc.), I'm transferring an Float32Array buffer back to the UI thread. Since such buffers are transferable objects , this will take (almost) zero time . Now, it turns out that WebGL (and therefore, Three.js) use Float32Array buffers internally, too. This means I could probably load this 3D animation without copying anything, spending almost zero time in the main thread. Isn't that nice? But it's not clear how to do that part: In the main thread, we have array buffers available for

I was wondering how do I solve this problem. I generate RSA-OAEP keypair using WebCrypto API, then I export private key in pkcs8 from the keypair which exports as ArrayBuffer and I want to encode this ArrayBuffer into base64 so I can store it as a PEM. In this testing example I am exporting key as pkcs8 and importing this pkcs8 back to CryptoKey. The problem is that sometimes it works and sometimes it does not. These are results of the code: NOTE: Only happens one of these states not all at once. NOTE2: This example does not contain -----BEGIN PRIVATE KEY----- prefix and suffix I am only