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/@exodus/bytes/fallback/latin1.js  | 151 +++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 vanilla/node_modules/@exodus/bytes/fallback/latin1.js

(limited to 'vanilla/node_modules/@exodus/bytes/fallback/latin1.js')

diff --git a/vanilla/node_modules/@exodus/bytes/fallback/latin1.js b/vanilla/node_modules/@exodus/bytes/fallback/latin1.js
new file mode 100644
index 0000000..dc734d8
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/fallback/latin1.js
@@ -0,0 +1,151 @@
+import {
+  nativeEncoder,
+  nativeDecoder,
+  nativeDecoderLatin1,
+  nativeBuffer,
+  encodeCharcodes,
+  isHermes,
+  isDeno,
+  isLE,
+} from './platform.js'
+
+const atob = /* @__PURE__ */ (() => globalThis.atob)()
+const web64 = /* @__PURE__ */ (() => Uint8Array.prototype.toBase64)()
+
+// See http://stackoverflow.com/a/22747272/680742, which says that lowest limit is in Chrome, with 0xffff args
+// On Hermes, actual max is 0x20_000 minus current stack depth, 1/16 of that should be safe
+const maxFunctionArgs = 0x20_00
+
+// toBase64+atob path is faster on everything where fromBase64 is fast
+const useLatin1atob = web64 && atob
+
+export function asciiPrefix(arr) {
+  let p = 0 // verified ascii bytes
+  const length = arr.length
+  // Threshold tested on Hermes (worse on <=48, better on >=52)
+  // Also on v8 arrs of size <=64 might be on heap and using Uint32Array on them is unoptimal
+  if (length > 64) {
+    // Speedup with u32
+    const u32start = (4 - (arr.byteOffset & 3)) % 4 // offset start by this many bytes for alignment
+    for (; p < u32start; p++) if (arr[p] >= 0x80) return p
+    const u32length = ((arr.byteLength - u32start) / 4) | 0
+    const u32 = new Uint32Array(arr.buffer, arr.byteOffset + u32start, u32length)
+    let i = 0
+    for (const last3 = u32length - 3; ; p += 16, i += 4) {
+      if (i >= last3) break // loop is fast enough for moving this here to be _very_ useful, likely due to array access checks
+      const a = u32[i]
+      const b = u32[i + 1]
+      const c = u32[i + 2]
+      const d = u32[i + 3]
+      // "(a | b | c | d) & mask" is slower on Hermes though faster on v8
+      if (a & 0x80_80_80_80 || b & 0x80_80_80_80 || c & 0x80_80_80_80 || d & 0x80_80_80_80) break
+    }
+
+    for (; i < u32length; p += 4, i++) if (u32[i] & 0x80_80_80_80) break
+  }
+
+  for (; p < length; p++) if (arr[p] >= 0x80) return p
+  return length
+}
+
+// Capable of decoding Uint16Array to UTF-16 as well as Uint8Array to Latin-1
+export function decodeLatin1(arr, start = 0, stop = arr.length) {
+  start |= 0
+  stop |= 0
+  const total = stop - start
+  if (total === 0) return ''
+
+  if (
+    useLatin1atob &&
+    total >= 256 &&
+    total < 1e8 &&
+    arr.toBase64 === web64 &&
+    arr.BYTES_PER_ELEMENT === 1
+  ) {
+    const sliced = start === 0 && stop === arr.length ? arr : arr.subarray(start, stop)
+    return atob(sliced.toBase64())
+  }
+
+  if (total > maxFunctionArgs) {
+    let prefix = ''
+    for (let i = start; i < stop; ) {
+      const i1 = Math.min(stop, i + maxFunctionArgs)
+      prefix += String.fromCharCode.apply(String, arr.subarray(i, i1))
+      i = i1
+    }
+
+    return prefix
+  }
+
+  const sliced = start === 0 && stop === arr.length ? arr : arr.subarray(start, stop)
+  return String.fromCharCode.apply(String, sliced)
+}
+
+// Unchecked for well-formedness, raw. Expects Uint16Array input
+export const decodeUCS2 =
+  nativeBuffer && isLE && !isDeno
+    ? (u16, stop = u16.length) => {
+        // TODO: fast path for BE, perhaps faster path for Deno. Note that decoder replaces, this function doesn't
+        if (stop > 32) return nativeBuffer.from(u16.buffer, u16.byteOffset, stop * 2).ucs2Slice() // from 64 bytes, below are in heap
+        return decodeLatin1(u16, 0, stop)
+      }
+    : (u16, stop = u16.length) => decodeLatin1(u16, 0, stop)
+
+// Does not check input, uses best available method
+// Building an array for this is only faster than proper string concatenation when TextDecoder or native Buffer are available
+export const decodeAscii = nativeBuffer
+  ? (a) =>
+      // Buffer is faster on Node.js (but only for long enough data), if we know that output is ascii
+      a.byteLength >= 0x3_00 && !isDeno
+        ? nativeBuffer.from(a.buffer, a.byteOffset, a.byteLength).latin1Slice(0, a.byteLength) // .latin1Slice is faster than .asciiSlice
+        : nativeDecoder.decode(a) // On Node.js, utf8 decoder is faster than latin1
+  : nativeDecoderLatin1
+    ? (a) => nativeDecoderLatin1.decode(a) // On browsers (specifically WebKit), latin1 decoder is faster than utf8
+    : (a) =>
+        decodeLatin1(
+          a instanceof Uint8Array ? a : new Uint8Array(a.buffer, a.byteOffset, a.byteLength)
+        )
+
+/* eslint-disable @exodus/mutable/no-param-reassign-prop-only */
+
+export function encodeAsciiPrefix(x, s) {
+  let i = 0
+  for (const len3 = s.length - 3; i < len3; i += 4) {
+    const x0 = s.charCodeAt(i), x1 = s.charCodeAt(i + 1), x2 = s.charCodeAt(i + 2), x3 = s.charCodeAt(i + 3) // prettier-ignore
+    if ((x0 | x1 | x2 | x3) >= 128) break
+    x[i] = x0
+    x[i + 1] = x1
+    x[i + 2] = x2
+    x[i + 3] = x3
+  }
+
+  return i
+}
+
+/* eslint-enable @exodus/mutable/no-param-reassign-prop-only */
+
+// Warning: can be used only on checked strings, converts strings to 8-bit
+export const encodeLatin1 = (str) => encodeCharcodes(str, new Uint8Array(str.length))
+
+// Expects nativeEncoder to be present
+const useEncodeInto = /* @__PURE__ */ (() => isHermes && nativeEncoder?.encodeInto)()
+export const encodeAscii = useEncodeInto
+  ? (str, ERR) => {
+      // Much faster in Hermes
+      const codes = new Uint8Array(str.length + 4) // overshoot by a full utf8 char
+      const info = nativeEncoder.encodeInto(str, codes)
+      if (info.read !== str.length || info.written !== str.length) throw new SyntaxError(ERR) // non-ascii
+      return codes.subarray(0, str.length)
+    }
+  : nativeBuffer
+    ? (str, ERR) => {
+        // TextEncoder is slow on Node.js 24 / 25 (was ok on 22)
+        const codes = nativeBuffer.from(str, 'utf8') // ascii/latin1 coerces, we need to check
+        if (codes.length !== str.length) throw new SyntaxError(ERR) // non-ascii
+        return new Uint8Array(codes.buffer, codes.byteOffset, codes.byteLength)
+      }
+    : (str, ERR) => {
+        const codes = nativeEncoder.encode(str)
+        if (codes.length !== str.length) throw new SyntaxError(ERR) // non-ascii
+        return codes
+      }
-- 
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