1 files changed, 233 insertions, 0 deletions
diff --git a/vanilla/node_modules/@exodus/bytes/fallback/base32.js b/vanilla/node_modules/@exodus/bytes/fallback/base32.js
new file mode 100644
index 0000000..5488b4b
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/fallback/base32.js
@@ -0,0 +1,233 @@
+import { assertU8 } from './_utils.js'
+import { nativeEncoder, nativeDecoder, isHermes } from './platform.js'
+import { encodeAscii, decodeAscii } from './latin1.js'
+
+// See https://datatracker.ietf.org/doc/html/rfc4648
+
+const BASE32 = [...'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'] // RFC 4648, #6
+const BASE32HEX = [...'0123456789ABCDEFGHIJKLMNOPQRSTUV'] // RFC 4648, #7
+const BASE32_HELPERS = {}
+const BASE32HEX_HELPERS = {}
+
+export const E_CHAR = 'Invalid character in base32 input'
+export const E_PADDING = 'Invalid base32 padding'
+export const E_LENGTH = 'Invalid base32 length'
+export const E_LAST = 'Invalid last chunk'
+
+const useTemplates = isHermes // Faster on Hermes and JSC, but we use it only on Hermes
+
+// We construct output by concatenating chars, this seems to be fine enough on modern JS engines
+export function toBase32(arr, isBase32Hex, padding) {
+  assertU8(arr)
+  const fullChunks = Math.floor(arr.length / 5)
+  const fullChunksBytes = fullChunks * 5
+  let o = ''
+  let i = 0
+
+  const alphabet = isBase32Hex ? BASE32HEX : BASE32
+  const helpers = isBase32Hex ? BASE32HEX_HELPERS : BASE32_HELPERS
+  if (!helpers.pairs) {
+    helpers.pairs = []
+    if (nativeDecoder) {
+      // Lazy to save memory in case if this is not needed
+      helpers.codepairs = new Uint16Array(32 * 32)
+      const u16 = helpers.codepairs
+      const u8 = new Uint8Array(u16.buffer, u16.byteOffset, u16.byteLength) // write as 1-byte to ignore BE/LE difference
+      for (let i = 0; i < 32; i++) {
+        const ic = alphabet[i].charCodeAt(0)
+        for (let j = 0; j < 32; j++) u8[(i << 6) | (j << 1)] = u8[(j << 6) | ((i << 1) + 1)] = ic
+      }
+    } else {
+      const p = helpers.pairs
+      for (let i = 0; i < 32; i++) {
+        for (let j = 0; j < 32; j++) p.push(`${alphabet[i]}${alphabet[j]}`)
+      }
+    }
+  }
+
+  const { pairs, codepairs } = helpers
+
+  // Fast path for complete blocks
+  // This whole loop can be commented out, the algorithm won't change, it's just an optimization of the next loop
+  if (nativeDecoder) {
+    const oa = new Uint16Array(fullChunks * 4)
+    for (let j = 0; i < fullChunksBytes; i += 5) {
+      const a = arr[i]
+      const b = arr[i + 1]
+      const c = arr[i + 2]
+      const d = arr[i + 3]
+      const e = arr[i + 4]
+      const x0 = (a << 2) | (b >> 6) // 8 + 8 - 5 - 5 = 6 left
+      const x1 = ((b & 0x3f) << 4) | (c >> 4) // 6 + 8 - 5 - 5 = 4 left
+      const x2 = ((c & 0xf) << 6) | (d >> 2) // 4 + 8 - 5 - 5 = 2 left
+      const x3 = ((d & 0x3) << 8) | e // 2 + 8 - 5 - 5 = 0 left
+      oa[j] = codepairs[x0]
+      oa[j + 1] = codepairs[x1]
+      oa[j + 2] = codepairs[x2]
+      oa[j + 3] = codepairs[x3]
+      j += 4
+    }
+
+    o = decodeAscii(oa)
+  } else if (useTemplates) {
+    // Templates are faster only on Hermes and JSC. Browsers have TextDecoder anyway
+    for (; i < fullChunksBytes; i += 5) {
+      const a = arr[i]
+      const b = arr[i + 1]
+      const c = arr[i + 2]
+      const d = arr[i + 3]
+      const e = arr[i + 4]
+      const x0 = (a << 2) | (b >> 6) // 8 + 8 - 5 - 5 = 6 left
+      const x1 = ((b & 0x3f) << 4) | (c >> 4) // 6 + 8 - 5 - 5 = 4 left
+      const x2 = ((c & 0xf) << 6) | (d >> 2) // 4 + 8 - 5 - 5 = 2 left
+      const x3 = ((d & 0x3) << 8) | e // 2 + 8 - 5 - 5 = 0 left
+      o += `${pairs[x0]}${pairs[x1]}${pairs[x2]}${pairs[x3]}`
+    }
+  } else {
+    for (; i < fullChunksBytes; i += 5) {
+      const a = arr[i]
+      const b = arr[i + 1]
+      const c = arr[i + 2]
+      const d = arr[i + 3]
+      const e = arr[i + 4]
+      const x0 = (a << 2) | (b >> 6) // 8 + 8 - 5 - 5 = 6 left
+      const x1 = ((b & 0x3f) << 4) | (c >> 4) // 6 + 8 - 5 - 5 = 4 left
+      const x2 = ((c & 0xf) << 6) | (d >> 2) // 4 + 8 - 5 - 5 = 2 left
+      const x3 = ((d & 0x3) << 8) | e // 2 + 8 - 5 - 5 = 0 left
+      o += pairs[x0]
+      o += pairs[x1]
+      o += pairs[x2]
+      o += pairs[x3]
+    }
+  }
+
+  // If we have something left, process it with a full algo
+  let carry = 0
+  let shift = 3 // First byte needs to be shifted by 3 to get 5 bits
+  for (; i < arr.length; i++) {
+    const x = arr[i]
+    o += alphabet[carry | (x >> shift)] // shift >= 3, so this fits
+    if (shift >= 5) {
+      shift -= 5
+      o += alphabet[(x >> shift) & 0x1f]
+    }
+
+    carry = (x << (5 - shift)) & 0x1f
+    shift += 3 // Each byte prints 5 bits and leaves 3 bits
+  }
+
+  if (shift !== 3) o += alphabet[carry] // shift 3 means we have no carry left
+  if (padding) o += ['', '======', '====', '===', '='][arr.length - fullChunksBytes]
+
+  return o
+}
+
+// TODO: can this be optimized? This only affects non-Hermes barebone engines though
+const mapSize = nativeEncoder ? 128 : 65_536 // we have to store 64 KiB map or recheck everything if we can't decode to byte array
+
+export function fromBase32(str, isBase32Hex) {
+  let inputLength = str.length
+  while (str[inputLength - 1] === '=') inputLength--
+  const paddingLength = str.length - inputLength
+  const tailLength = inputLength % 8
+  const mainLength = inputLength - tailLength // multiples of 8
+  if (![0, 2, 4, 5, 7].includes(tailLength)) throw new SyntaxError(E_LENGTH) // fast verification
+  if (paddingLength > 7 || (paddingLength !== 0 && str.length % 8 !== 0)) {
+    throw new SyntaxError(E_PADDING)
+  }
+
+  const alphabet = isBase32Hex ? BASE32HEX : BASE32
+  const helpers = isBase32Hex ? BASE32HEX_HELPERS : BASE32_HELPERS
+
+  if (!helpers.fromMap) {
+    helpers.fromMap = new Int8Array(mapSize).fill(-1) // no regex input validation here, so we map all other bytes to -1 and recheck sign
+    alphabet.forEach((c, i) => {
+      helpers.fromMap[c.charCodeAt(0)] = helpers.fromMap[c.toLowerCase().charCodeAt(0)] = i
+    })
+  }
+
+  const m = helpers.fromMap
+
+  const arr = new Uint8Array(Math.floor((inputLength * 5) / 8))
+  let at = 0
+  let i = 0
+
+  if (nativeEncoder) {
+    const codes = encodeAscii(str, E_CHAR)
+    for (; i < mainLength; i += 8) {
+      // each 5 bits, grouped 5 * 4 = 20
+      const x0 = codes[i]
+      const x1 = codes[i + 1]
+      const x2 = codes[i + 2]
+      const x3 = codes[i + 3]
+      const x4 = codes[i + 4]
+      const x5 = codes[i + 5]
+      const x6 = codes[i + 6]
+      const x7 = codes[i + 7]
+      const a = (m[x0] << 15) | (m[x1] << 10) | (m[x2] << 5) | m[x3]
+      const b = (m[x4] << 15) | (m[x5] << 10) | (m[x6] << 5) | m[x7]
+      if (a < 0 || b < 0) throw new SyntaxError(E_CHAR)
+      arr[at] = a >> 12
+      arr[at + 1] = (a >> 4) & 0xff
+      arr[at + 2] = ((a << 4) & 0xff) | (b >> 16)
+      arr[at + 3] = (b >> 8) & 0xff
+      arr[at + 4] = b & 0xff
+      at += 5
+    }
+  } else {
+    for (; i < mainLength; i += 8) {
+      // each 5 bits, grouped 5 * 4 = 20
+      const x0 = str.charCodeAt(i)
+      const x1 = str.charCodeAt(i + 1)
+      const x2 = str.charCodeAt(i + 2)
+      const x3 = str.charCodeAt(i + 3)
+      const x4 = str.charCodeAt(i + 4)
+      const x5 = str.charCodeAt(i + 5)
+      const x6 = str.charCodeAt(i + 6)
+      const x7 = str.charCodeAt(i + 7)
+      const a = (m[x0] << 15) | (m[x1] << 10) | (m[x2] << 5) | m[x3]
+      const b = (m[x4] << 15) | (m[x5] << 10) | (m[x6] << 5) | m[x7]
+      if (a < 0 || b < 0) throw new SyntaxError(E_CHAR)
+      arr[at] = a >> 12
+      arr[at + 1] = (a >> 4) & 0xff
+      arr[at + 2] = ((a << 4) & 0xff) | (b >> 16)
+      arr[at + 3] = (b >> 8) & 0xff
+      arr[at + 4] = b & 0xff
+      at += 5
+    }
+  }
+
+  // Last block, valid tailLength: 0 2 4 5 7, checked already
+  // We check last chunk to be strict
+  if (tailLength < 2) return arr
+  const ab = (m[str.charCodeAt(i++)] << 5) | m[str.charCodeAt(i++)]
+  if (ab < 0) throw new SyntaxError(E_CHAR)
+  arr[at++] = ab >> 2
+  if (tailLength < 4) {
+    if (ab & 0x3) throw new SyntaxError(E_LAST)
+    return arr
+  }
+
+  const cd = (m[str.charCodeAt(i++)] << 5) | m[str.charCodeAt(i++)]
+  if (cd < 0) throw new SyntaxError(E_CHAR)
+  arr[at++] = ((ab << 6) & 0xff) | (cd >> 4)
+  if (tailLength < 5) {
+    if (cd & 0xf) throw new SyntaxError(E_LAST)
+    return arr
+  }
+
+  const e = m[str.charCodeAt(i++)]
+  if (e < 0) throw new SyntaxError(E_CHAR)
+  arr[at++] = ((cd << 4) & 0xff) | (e >> 1) // 4 + 4
+  if (tailLength < 7) {
+    if (e & 0x1) throw new SyntaxError(E_LAST)
+    return arr
+  }
+
+  const fg = (m[str.charCodeAt(i++)] << 5) | m[str.charCodeAt(i++)]
+  if (fg < 0) throw new SyntaxError(E_CHAR)
+  arr[at++] = ((e << 7) & 0xff) | (fg >> 3) // 1 + 5 + 2
+  // Can't be 8, so no h
+  if (fg & 0x7) throw new SyntaxError(E_LAST)
+  return arr
+}