将二进制 NodeJS 缓冲区转换为 JavaScript ArrayBuffer [英] Convert a binary NodeJS Buffer to JavaScript ArrayBuffer

问题描述

如何将 NodeJS 二进制缓冲区转换为 JavaScript ArrayBuffer?

How can I convert a NodeJS binary buffer into a JavaScript ArrayBuffer?

推荐答案

实例Buffer 也是 node.js 4.x 及更高版本中 Uint8Array 的实例.因此，最有效的解决方案是直接访问 buf.buffer 属性，根据 https://stackoverflow.com/a/31394257/1375574.Buffer 构造函数还需要一个 ArrayBufferView 参数，如果你需要去另一个方向.

Instances of Buffer are also instances of Uint8Array in node.js 4.x and higher. Thus, the most efficient solution is to access the buf.buffer property directly, as per https://stackoverflow.com/a/31394257/1375574. The Buffer constructor also takes an ArrayBufferView argument if you need to go the other direction.

请注意，这不会创建副本，这意味着写入任何 ArrayBufferView 都将写入原始 Buffer 实例.

Note that this will not create a copy, which means that writes to any ArrayBufferView will write through to the original Buffer instance.

从缓冲区到数组缓冲区:

From Buffer to ArrayBuffer:

function toArrayBuffer(buf) {
    const ab = new ArrayBuffer(buf.length);
    const view = new Uint8Array(ab);
    for (let i = 0; i < buf.length; ++i) {
        view[i] = buf[i];
    }
    return ab;
}

从数组缓冲区到缓冲区:

From ArrayBuffer to Buffer:

function toBuffer(ab) {
    const buf = Buffer.alloc(ab.byteLength);
    const view = new Uint8Array(ab);
    for (let i = 0; i < buf.length; ++i) {
        buf[i] = view[i];
    }
    return buf;
}

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