1 files changed, 220 insertions, 0 deletions
diff --git a/vanilla/node_modules/@exodus/bytes/base58.js b/vanilla/node_modules/@exodus/bytes/base58.js
new file mode 100644
index 0000000..c032aba
--- /dev/null
+++ b/vanilla/node_modules/@exodus/bytes/base58.js
@@ -0,0 +1,220 @@
+import { typedView } from './array.js'
+import { assertU8, E_STRING } from './fallback/_utils.js'
+import { nativeDecoder, nativeEncoder, isHermes } from './fallback/platform.js'
+import { encodeAscii, decodeAscii } from './fallback/latin1.js'
+
+const alphabet58 = [...'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz']
+const alphabetXRP = [...'rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz']
+const codes58 = new Uint8Array(alphabet58.map((x) => x.charCodeAt(0)))
+const codesXRP = new Uint8Array(alphabetXRP.map((x) => x.charCodeAt(0)))
+
+const _0n = BigInt(0)
+const _1n = BigInt(1)
+const _8n = BigInt(8)
+const _32n = BigInt(32)
+const _58n = BigInt(58)
+const _0xffffffffn = BigInt(0xff_ff_ff_ff)
+
+let table // 15 * 82, diagonal, <1kb
+const fromMaps = new Map()
+
+const E_CHAR = 'Invalid character in base58 input'
+
+const shouldUseBigIntFrom = isHermes // faster only on Hermes, numbers path beats it on normal engines
+
+function toBase58core(arr, alphabet, codes) {
+  assertU8(arr)
+  const length = arr.length
+  if (length === 0) return ''
+
+  const ZERO = alphabet[0]
+  let zeros = 0
+  while (zeros < length && arr[zeros] === 0) zeros++
+
+  if (length > 60) {
+    // Slow path. Can be optimized ~10%, but the main factor is /58n division anyway, so doesn't matter much
+    let x = _0n
+    for (let i = 0; i < arr.length; i++) x = (x << _8n) | BigInt(arr[i])
+
+    let out = ''
+    while (x) {
+      const d = x / _58n
+      out = alphabet[Number(x - _58n * d)] + out
+      x = d
+    }
+
+    return ZERO.repeat(zeros) + out
+  }
+
+  // We run fast mode operations only on short (<=60 bytes) inputs, via precomputation table
+  if (!table) {
+    table = []
+    let x = _1n
+    for (let i = 0; i < 15; i++) {
+      // Convert x to base 58 digits
+      const in58 = []
+      let y = x
+      while (y) {
+        const d = y / _58n
+        in58.push(Number(y - _58n * d))
+        y = d
+      }
+
+      table.push(new Uint8Array(in58))
+      x <<= _32n
+    }
+  }
+
+  const res = []
+  {
+    let j = 0
+    // We group each 4 bytes into 32-bit chunks
+    // Not using u32arr to not deal with remainder + BE/LE differences
+    for (let i = length - 1; i >= 0; i -= 4) {
+      let c
+      if (i > 2) {
+        c = (arr[i] | (arr[i - 1] << 8) | (arr[i - 2] << 16) | (arr[i - 3] << 24)) >>> 0
+      } else if (i > 1) {
+        c = arr[i] | (arr[i - 1] << 8) | (arr[i - 2] << 16)
+      } else {
+        c = i === 1 ? arr[i] | (arr[i - 1] << 8) : arr[i]
+      }
+
+      const row = table[j++]
+      if (c === 0) continue
+      const olen = res.length
+      const nlen = row.length
+      let k = 0
+      for (; k < olen; k++) res[k] += c * row[k]
+      while (k < nlen) res.push(c * row[k++])
+    }
+  }
+
+  // We can now do a single scan over regular numbers under MAX_SAFE_INTEGER
+  // Note: can't use int32 operations on them, as they are outside of 2**32 range
+  // This is faster though
+  {
+    let carry = 0
+    let i = 0
+    while (i < res.length) {
+      const c = res[i] + carry
+      carry = Math.floor(c / 58)
+      res[i++] = c - carry * 58
+    }
+
+    while (carry) {
+      const c = carry
+      carry = Math.floor(c / 58)
+      res.push(c - carry * 58)
+    }
+  }
+
+  if (nativeDecoder) {
+    const oa = new Uint8Array(res.length)
+    let j = 0
+    for (let i = res.length - 1; i >= 0; i--) oa[j++] = codes[res[i]]
+    return ZERO.repeat(zeros) + decodeAscii(oa)
+  }
+
+  let out = ''
+  for (let i = res.length - 1; i >= 0; i--) out += alphabet[res[i]]
+  return ZERO.repeat(zeros) + out
+}
+
+function fromBase58core(str, alphabet, codes, format = 'uint8') {
+  if (typeof str !== 'string') throw new TypeError(E_STRING)
+  const length = str.length
+  if (length === 0) return typedView(new Uint8Array(), format)
+
+  const zeroC = codes[0]
+  let zeros = 0
+  while (zeros < length && str.charCodeAt(zeros) === zeroC) zeros++
+
+  let fromMap = fromMaps.get(alphabet)
+  if (!fromMap) {
+    fromMap = new Int8Array(256).fill(-1)
+    for (let i = 0; i < 58; i++) fromMap[alphabet[i].charCodeAt(0)] = i
+    fromMaps.set(alphabet, fromMap)
+  }
+
+  const size = zeros + (((length - zeros + 1) * 3) >> 2) // 3/4 rounded up, larger than ~0.73 coef to fit everything
+  const res = new Uint8Array(size)
+  let at = size // where is the first significant byte written
+
+  if (shouldUseBigIntFrom) {
+    let x = _0n
+
+    // nativeEncoder gives a benefit here
+    if (nativeEncoder) {
+      const codes = encodeAscii(str, E_CHAR)
+      for (let i = zeros; i < length; i++) {
+        const c = fromMap[codes[i]]
+        if (c < 0) throw new SyntaxError(E_CHAR)
+        x = x * _58n + BigInt(c)
+      }
+    } else {
+      for (let i = zeros; i < length; i++) {
+        const charCode = str.charCodeAt(i)
+        const c = fromMap[charCode]
+        if (charCode > 255 || c < 0) throw new SyntaxError(E_CHAR)
+        x = x * _58n + BigInt(c)
+      }
+    }
+
+    while (x) {
+      let y = Number(x & _0xffffffffn)
+      x >>= 32n
+      res[--at] = y & 0xff
+      y >>>= 8
+      if (!x && !y) break
+      res[--at] = y & 0xff
+      y >>>= 8
+      if (!x && !y) break
+      res[--at] = y & 0xff
+      y >>>= 8
+      if (!x && !y) break
+      res[--at] = y & 0xff
+    }
+  } else {
+    for (let i = zeros; i < length; i++) {
+      const charCode = str.charCodeAt(i)
+      let c = fromMap[charCode]
+      if (charCode > 255 || c < 0) throw new SyntaxError(E_CHAR)
+
+      let k = size - 1
+      for (;;) {
+        if (c === 0 && k < at) break
+        c += 58 * res[k]
+        res[k] = c & 0xff
+        c >>>= 8
+        k--
+        // unroll a bit
+        if (c === 0 && k < at) break
+        c += 58 * res[k]
+        res[k] = c & 0xff
+        c >>>= 8
+        k--
+        if (c === 0 && k < at) break
+        c += 58 * res[k]
+        res[k] = c & 0xff
+        c >>>= 8
+        k--
+        if (c === 0 && k < at) break
+        c += 58 * res[k]
+        res[k] = c & 0xff
+        c >>>= 8
+        k--
+      }
+
+      at = k + 1
+      if (c !== 0 || at < zeros) /* c8 ignore next */ throw new Error('Unexpected') // unreachable
+    }
+  }
+
+  return typedView(res.slice(at - zeros), format) // slice is faster for small sizes than subarray
+}
+
+export const toBase58 = (arr) => toBase58core(arr, alphabet58, codes58)
+export const fromBase58 = (str, format) => fromBase58core(str, alphabet58, codes58, format)
+export const toBase58xrp = (arr) => toBase58core(arr, alphabetXRP, codesXRP)
+export const fromBase58xrp = (str, format) => fromBase58core(str, alphabetXRP, codesXRP, format)