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/single-byte.node.js | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 vanilla/node_modules/@exodus/bytes/single-byte.node.js

(limited to 'vanilla/node_modules/@exodus/bytes/single-byte.node.js')

diff --git a/vanilla/node_modules/@exodus/bytes/single-byte.node.js b/vanilla/node_modules/@exodus/bytes/single-byte.node.js
new file mode 100644
index 0000000..e04d942
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/single-byte.node.js
@@ -0,0 +1,120 @@
+import { isAscii } from 'node:buffer'
+import { assertU8, toBuf, E_STRING } from './fallback/_utils.js'
+import { isDeno, isLE } from './fallback/platform.js'
+import { asciiPrefix } from './fallback/latin1.js'
+import { encodingMapper, encodingDecoder, encodeMap, E_STRICT } from './fallback/single-byte.js'
+
+function latin1Prefix(arr, start) {
+  let p = start | 0
+  const length = arr.length
+  for (const len3 = length - 3; p < len3; p += 4) {
+    if ((arr[p] & 0xe0) === 0x80) return p
+    if ((arr[p + 1] & 0xe0) === 0x80) return p + 1
+    if ((arr[p + 2] & 0xe0) === 0x80) return p + 2
+    if ((arr[p + 3] & 0xe0) === 0x80) return p + 3
+  }
+
+  for (; p < length; p++) {
+    if ((arr[p] & 0xe0) === 0x80) return p
+  }
+
+  return length
+}
+
+export function createSinglebyteDecoder(encoding, loose = false) {
+  if (typeof loose !== 'boolean') throw new TypeError('loose option should be boolean')
+  if (isDeno) {
+    const jsDecoder = encodingDecoder(encoding) // asserts
+    return (arr) => {
+      assertU8(arr)
+      if (arr.byteLength === 0) return ''
+      if (isAscii(arr)) return toBuf(arr).toString()
+      return jsDecoder(arr, loose) // somewhy faster on Deno anyway, TODO: optimize?
+    }
+  }
+
+  const isLatin1 = encoding === 'iso-8859-1'
+  const latin1path = encoding === 'windows-1252'
+  const { incomplete, mapper } = encodingMapper(encoding) // asserts
+  return (arr) => {
+    assertU8(arr)
+    if (arr.byteLength === 0) return ''
+    if (isLatin1 || isAscii(arr)) return toBuf(arr).latin1Slice() // .latin1Slice is faster than .asciiSlice
+
+    // Node.js TextDecoder is broken, so we can't use it. It's also slow anyway
+
+    let prefixBytes = asciiPrefix(arr)
+    let prefix = ''
+    if (latin1path) prefixBytes = latin1Prefix(arr, prefixBytes)
+    if (prefixBytes > 64 || prefixBytes === arr.length) {
+      prefix = toBuf(arr).latin1Slice(0, prefixBytes) // .latin1Slice is faster than .asciiSlice
+      if (prefixBytes === arr.length) return prefix
+    }
+
+    const b = toBuf(mapper(arr, prefix.length)) // prefix.length can mismatch prefixBytes
+    if (!isLE) b.swap16()
+    const suffix = b.ucs2Slice(0, b.byteLength)
+    if (!loose && incomplete && suffix.includes('\uFFFD')) throw new TypeError(E_STRICT)
+    return prefix + suffix
+  }
+}
+
+const NON_LATIN = /[^\x00-\xFF]/ // eslint-disable-line no-control-regex
+
+function encode(s, m) {
+  const len = s.length
+  let i = 0
+  const b = Buffer.from(s, 'utf-16le') // aligned
+  if (!isLE) b.swap16()
+  const x = new Uint16Array(b.buffer, b.byteOffset, b.byteLength / 2)
+  for (const len3 = len - 3; i < len3; i += 4) {
+    const x0 = x[i], x1 = x[i + 1], x2 = x[i + 2], x3 = x[i + 3] // prettier-ignore
+    const c0 = m[x0], c1 = m[x1], c2 = m[x2], c3 = m[x3] // prettier-ignore
+    if (!(c0 && c1 && c2 && c3) && ((!c0 && x0) || (!c1 && x1) || (!c2 && x2) || (!c3 && x3))) return null // prettier-ignore
+    x[i] = c0
+    x[i + 1] = c1
+    x[i + 2] = c2
+    x[i + 3] = c3
+  }
+
+  for (; i < len; i++) {
+    const x0 = x[i]
+    const c0 = m[x0]
+    if (!c0 && x0) return null
+    x[i] = c0
+  }
+
+  return new Uint8Array(x)
+}
+
+export function createSinglebyteEncoder(encoding, { mode = 'fatal' } = {}) {
+  // TODO: replacement, truncate (replacement will need varying length)
+  if (mode !== 'fatal') throw new Error('Unsupported mode')
+  const m = encodeMap(encoding) // asserts
+  const isLatin1 = encoding === 'iso-8859-1'
+
+  return (s) => {
+    if (typeof s !== 'string') throw new TypeError(E_STRING)
+    if (isLatin1) {
+      if (NON_LATIN.test(s)) throw new TypeError(E_STRICT)
+      const b = Buffer.from(s, 'latin1')
+      return new Uint8Array(b.buffer, b.byteOffset, b.byteLength)
+    }
+
+    // Instead of an ASCII regex check, encode optimistically - this is faster
+    // Check for 8-bit string with a regex though, this is instant on 8-bit strings so doesn't hurt the ASCII fast path
+    if (!NON_LATIN.test(s)) {
+      const b = Buffer.from(s, 'utf8') // ascii/latin1 coerces, we need to check
+      if (b.length === s.length) return new Uint8Array(b.buffer, b.byteOffset, b.byteLength)
+    }
+
+    const res = encode(s, m)
+    if (!res) throw new TypeError(E_STRICT)
+    return res
+  }
+}
+
+export const latin1toString = /* @__PURE__ */ createSinglebyteDecoder('iso-8859-1')
+export const latin1fromString = /* @__PURE__ */ createSinglebyteEncoder('iso-8859-1')
+export const windows1252toString = /* @__PURE__ */ createSinglebyteDecoder('windows-1252')
+export const windows1252fromString = /* @__PURE__ */ createSinglebyteEncoder('windows-1252')
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