feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 70 insertions, 0 deletions

diff --git a/vanilla/node_modules/@exodus/bytes/utf16.node.js b/vanilla/node_modules/@exodus/bytes/utf16.node.js
new file mode 100644
index 0000000..53183a3
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/utf16.node.js
@@ -0,0 +1,70 @@
+import { assertU8, E_STRING, E_STRICT_UNICODE } from './fallback/_utils.js'
+import { isDeno, isLE } from './fallback/platform.js'
+import { E_STRICT, decodeApiDecoders } from './fallback/utf16.js'
+
+if (Buffer.TYPED_ARRAY_SUPPORT) throw new Error('Unexpected Buffer polyfill')
+
+const { isWellFormed, toWellFormed } = String.prototype
+const to8 = (a) => new Uint8Array(a.buffer, a.byteOffset, a.byteLength)
+
+// Unlike utf8, operates on Uint16Arrays by default
+
+function encode(str, loose = false, format = 'uint16') {
+  if (typeof str !== 'string') throw new TypeError(E_STRING)
+  if (format !== 'uint16' && format !== 'uint8-le' && format !== 'uint8-be') {
+    throw new TypeError('Unknown format')
+  }
+
+  if (loose) {
+    str = toWellFormed.call(str) // Buffer doesn't do this with utf16 encoding
+  } else if (!isWellFormed.call(str)) {
+    throw new TypeError(E_STRICT_UNICODE)
+  }
+
+  const ble = Buffer.from(str, 'utf-16le')
+
+  if (format === 'uint8-le') return to8(ble)
+  if (format === 'uint8-be') return to8(ble.swap16())
+  if (format === 'uint16') {
+    const b = ble.byteOffset % 2 === 0 ? ble : Buffer.from(ble) // it should be already aligned, but just in case
+    if (!isLE) b.swap16()
+    return new Uint16Array(b.buffer, b.byteOffset, b.byteLength / 2)
+  }
+
+  /* c8 ignore next */
+  throw new Error('Unreachable')
+}
+
+// Convert to Buffer view or a swapped Buffer copy
+const swapped = (x, swap) => {
+  const b = Buffer.from(x.buffer, x.byteOffset, x.byteLength)
+  return swap ? Buffer.from(b).swap16() : b
+}
+
+// We skip TextDecoder on Node.js, as it's is somewhy significantly slower than Buffer for utf16
+// Also, it incorrectly misses replacements with Node.js is built without ICU, we fix that
+function decodeNode(input, loose = false, format = 'uint16') {
+  let ble
+  if (format === 'uint16') {
+    if (!(input instanceof Uint16Array)) throw new TypeError('Expected an Uint16Array')
+    ble = swapped(input, !isLE)
+  } else if (format === 'uint8-le' || format === 'uint8-be') {
+    assertU8(input)
+    if (input.byteLength % 2 !== 0) throw new TypeError('Expected even number of bytes')
+    ble = swapped(input, format === 'uint8-be')
+  } else {
+    throw new TypeError('Unknown format')
+  }
+
+  const str = ble.ucs2Slice(0, ble.byteLength)
+  if (loose) return toWellFormed.call(str)
+  if (isWellFormed.call(str)) return str
+  throw new TypeError(E_STRICT)
+}
+
+const decode = isDeno ? decodeApiDecoders : decodeNode
+
+export const utf16fromString = (str, format = 'uint16') => encode(str, false, format)
+export const utf16fromStringLoose = (str, format = 'uint16') => encode(str, true, format)
+export const utf16toString = (arr, format = 'uint16') => decode(arr, false, format)
+export const utf16toStringLoose = (arr, format = 'uint16') => decode(arr, true, format)