MCP Cloudflare DNS Server

# bufferutil [](https://www.npmjs.com/package/bufferutil) [](https://github.com/websockets/bufferutil/actions?query=workflow%3ACI+branch%3Amaster) `bufferutil` is what makes `ws` fast. It provides some utilities to efficiently perform some operations such as masking and unmasking the data payload of WebSocket frames. ## Installation ``` npm install bufferutil --save-optional ``` The `--save-optional` flag tells npm to save the package in your package.json under the [`optionalDependencies`](https://docs.npmjs.com/files/package.json#optionaldependencies) key. ## API The module exports two functions. To maximize performance, parameters are not validated. It is the caller's responsibility to ensure that they are correct. ### `bufferUtil.mask(source, mask, output, offset, length)` Masks a buffer using the given masking-key as specified by the WebSocket protocol. #### Arguments - `source` - The buffer to mask. - `mask` - A buffer representing the masking-key. - `output` - The buffer where to store the result. - `offset` - The offset at which to start writing. - `length` - The number of bytes to mask. #### Example ```js 'use strict'; const bufferUtil = require('bufferutil'); const crypto = require('crypto'); const source = crypto.randomBytes(10); const mask = crypto.randomBytes(4); bufferUtil.mask(source, mask, source, 0, source.length); ``` ### `bufferUtil.unmask(buffer, mask)` Unmasks a buffer using the given masking-key as specified by the WebSocket protocol. #### Arguments - `buffer` - The buffer to unmask. - `mask` - A buffer representing the masking-key. #### Example ```js 'use strict'; const bufferUtil = require('bufferutil'); const crypto = require('crypto'); const buffer = crypto.randomBytes(10); const mask = crypto.randomBytes(4); bufferUtil.unmask(buffer, mask); ``` ## License [MIT](LICENSE)