1 files changed, 135 insertions, 0 deletions
diff --git a/vanilla/node_modules/@exodus/bytes/single-byte.js b/vanilla/node_modules/@exodus/bytes/single-byte.js
new file mode 100644
index 0000000..ba17324
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/single-byte.js
@@ -0,0 +1,135 @@
+import { assertU8, E_STRING } from './fallback/_utils.js'
+import { nativeDecoderLatin1, nativeEncoder } from './fallback/platform.js'
+import { encodeAscii, encodeAsciiPrefix, encodeLatin1 } from './fallback/latin1.js'
+import { assertEncoding, encodingDecoder, encodeMap, E_STRICT } from './fallback/single-byte.js'
+
+const { TextDecoder, btoa } = globalThis
+
+let windows1252works
+
+// prettier-ignore
+const skipNative = new Set([
+  'iso-8859-1', 'iso-8859-9', 'iso-8859-11', // non-WHATWG
+  'iso-8859-6', 'iso-8859-8', 'iso-8859-8-i', // slow in all 3 engines
+  'iso-8859-16', // iso-8859-16 is somehow broken in WebKit, at least on CI
+])
+
+function shouldUseNative(enc) {
+  // https://issues.chromium.org/issues/468458388
+  // Also might be incorrectly imlemented on platforms as Latin1 (e.g. in Node.js) or regress
+  // This is the most significant single-byte encoding, 'ascii' and 'latin1' alias to this
+  // Even after Chrome bug is fixed, this should serve as a quick correctness check that it's actually windows-1252
+  if (enc === 'windows-1252') {
+    if (windows1252works === undefined) {
+      windows1252works = false
+      try {
+        const u = new Uint8Array(9) // using 9 bytes is significant to catch the bug
+        u[8] = 128
+        windows1252works = new TextDecoder(enc).decode(u).codePointAt(8) === 0x20_ac
+      } catch {}
+    }
+
+    return windows1252works
+  }
+
+  return !skipNative.has(enc)
+}
+
+export function createSinglebyteDecoder(encoding, loose = false) {
+  if (typeof loose !== 'boolean') throw new TypeError('loose option should be boolean')
+  assertEncoding(encoding)
+
+  if (nativeDecoderLatin1 && shouldUseNative(encoding)) {
+    // In try, as not all encodings might be implemented in all engines which have native TextDecoder
+    try {
+      const decoder = new TextDecoder(encoding, { fatal: !loose })
+      return (arr) => {
+        assertU8(arr)
+        if (arr.byteLength === 0) return ''
+        return decoder.decode(arr)
+      }
+    } catch {}
+  }
+
+  const jsDecoder = encodingDecoder(encoding)
+  return (arr) => {
+    assertU8(arr)
+    if (arr.byteLength === 0) return ''
+    return jsDecoder(arr, loose)
+  }
+}
+
+const NON_LATIN = /[^\x00-\xFF]/ // eslint-disable-line no-control-regex
+
+function encode(s, m) {
+  const len = s.length
+  const x = new Uint8Array(len)
+  let i = nativeEncoder ? 0 : encodeAsciiPrefix(x, s)
+
+  for (const len3 = len - 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
+    const c0 = m[x0], c1 = m[x1], c2 = m[x2], c3 = m[x3] // prettier-ignore
+    if ((!c0 && x0) || (!c1 && x1) || (!c2 && x2) || (!c3 && x3)) return null
+
+    x[i] = c0
+    x[i + 1] = c1
+    x[i + 2] = c2
+    x[i + 3] = c3
+  }
+
+  for (; i < len; i++) {
+    const x0 = s.charCodeAt(i)
+    const c0 = m[x0]
+    if (!c0 && x0) return null
+    x[i] = c0
+  }
+
+  return x
+}
+
+// fromBase64+btoa path is faster on everything where fromBase64 is fast
+const useLatin1btoa = Uint8Array.fromBase64 && btoa
+
+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'
+
+  // No single-byte encoder produces surrogate pairs, so any surrogate is invalid
+  // This needs special treatment only to decide how many replacement chars to output, one or two
+  // Not much use in running isWellFormed, most likely cause of error is unmapped chars, not surrogate pairs
+  return (s) => {
+    if (typeof s !== 'string') throw new TypeError(E_STRING)
+    if (isLatin1) {
+      // max limit is to not produce base64 strings that are too long
+      if (useLatin1btoa && s.length >= 1024 && s.length < 1e8) {
+        try {
+          return Uint8Array.fromBase64(btoa(s)) // fails on non-latin1
+        } catch {
+          throw new TypeError(E_STRICT)
+        }
+      }
+
+      if (NON_LATIN.test(s)) throw new TypeError(E_STRICT)
+      return encodeLatin1(s)
+    }
+
+    // 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 (nativeEncoder && !NON_LATIN.test(s)) {
+      try {
+        return encodeAscii(s, E_STRICT)
+      } catch {}
+    }
+
+    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')