From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 .../node_modules/undici/lib/web/websocket/frame.js | 133 +++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 vanilla/node_modules/undici/lib/web/websocket/frame.js

(limited to 'vanilla/node_modules/undici/lib/web/websocket/frame.js')

diff --git a/vanilla/node_modules/undici/lib/web/websocket/frame.js b/vanilla/node_modules/undici/lib/web/websocket/frame.js
new file mode 100644
index 0000000..e397c87
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/web/websocket/frame.js
@@ -0,0 +1,133 @@
+'use strict'
+
+const { runtimeFeatures } = require('../../util/runtime-features')
+const { maxUnsigned16Bit, opcodes } = require('./constants')
+
+const BUFFER_SIZE = 8 * 1024
+
+let buffer = null
+let bufIdx = BUFFER_SIZE
+
+const randomFillSync = runtimeFeatures.has('crypto')
+  ? require('node:crypto').randomFillSync
+  // not full compatibility, but minimum.
+  : function randomFillSync (buffer, _offset, _size) {
+    for (let i = 0; i < buffer.length; ++i) {
+      buffer[i] = Math.random() * 255 | 0
+    }
+    return buffer
+  }
+
+function generateMask () {
+  if (bufIdx === BUFFER_SIZE) {
+    bufIdx = 0
+    randomFillSync((buffer ??= Buffer.allocUnsafeSlow(BUFFER_SIZE)), 0, BUFFER_SIZE)
+  }
+  return [buffer[bufIdx++], buffer[bufIdx++], buffer[bufIdx++], buffer[bufIdx++]]
+}
+
+class WebsocketFrameSend {
+  /**
+   * @param {Buffer|undefined} data
+   */
+  constructor (data) {
+    this.frameData = data
+  }
+
+  createFrame (opcode) {
+    const frameData = this.frameData
+    const maskKey = generateMask()
+    const bodyLength = frameData?.byteLength ?? 0
+
+    /** @type {number} */
+    let payloadLength = bodyLength // 0-125
+    let offset = 6
+
+    if (bodyLength > maxUnsigned16Bit) {
+      offset += 8 // payload length is next 8 bytes
+      payloadLength = 127
+    } else if (bodyLength > 125) {
+      offset += 2 // payload length is next 2 bytes
+      payloadLength = 126
+    }
+
+    const buffer = Buffer.allocUnsafe(bodyLength + offset)
+
+    // Clear first 2 bytes, everything else is overwritten
+    buffer[0] = buffer[1] = 0
+    buffer[0] |= 0x80 // FIN
+    buffer[0] = (buffer[0] & 0xF0) + opcode // opcode
+
+    /*! ws. MIT License. Einar Otto Stangvik <einaros@gmail.com> */
+    buffer[offset - 4] = maskKey[0]
+    buffer[offset - 3] = maskKey[1]
+    buffer[offset - 2] = maskKey[2]
+    buffer[offset - 1] = maskKey[3]
+
+    buffer[1] = payloadLength
+
+    if (payloadLength === 126) {
+      buffer.writeUInt16BE(bodyLength, 2)
+    } else if (payloadLength === 127) {
+      // Clear extended payload length
+      buffer[2] = buffer[3] = 0
+      buffer.writeUIntBE(bodyLength, 4, 6)
+    }
+
+    buffer[1] |= 0x80 // MASK
+
+    // mask body
+    for (let i = 0; i < bodyLength; ++i) {
+      buffer[offset + i] = frameData[i] ^ maskKey[i & 3]
+    }
+
+    return buffer
+  }
+
+  /**
+   * @param {Uint8Array} buffer
+   */
+  static createFastTextFrame (buffer) {
+    const maskKey = generateMask()
+
+    const bodyLength = buffer.length
+
+    // mask body
+    for (let i = 0; i < bodyLength; ++i) {
+      buffer[i] ^= maskKey[i & 3]
+    }
+
+    let payloadLength = bodyLength
+    let offset = 6
+
+    if (bodyLength > maxUnsigned16Bit) {
+      offset += 8 // payload length is next 8 bytes
+      payloadLength = 127
+    } else if (bodyLength > 125) {
+      offset += 2 // payload length is next 2 bytes
+      payloadLength = 126
+    }
+    const head = Buffer.allocUnsafeSlow(offset)
+
+    head[0] = 0x80 /* FIN */ | opcodes.TEXT /* opcode TEXT */
+    head[1] = payloadLength | 0x80 /* MASK */
+    head[offset - 4] = maskKey[0]
+    head[offset - 3] = maskKey[1]
+    head[offset - 2] = maskKey[2]
+    head[offset - 1] = maskKey[3]
+
+    if (payloadLength === 126) {
+      head.writeUInt16BE(bodyLength, 2)
+    } else if (payloadLength === 127) {
+      head[2] = head[3] = 0
+      head.writeUIntBE(bodyLength, 4, 6)
+    }
+
+    return [head, buffer]
+  }
+}
+
+module.exports = {
+  WebsocketFrameSend,
+  generateMask // for benchmark
+}
-- 
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