rename encode func name, add decode func

base32.js

@@ -7,8 +7,13 @@ for (const idx in encodeTable) {
 const base32 = {}
 module.exports = base32
 
-base32.encode = (b) => {
+/**
-  if (!(b instanceof Buffer)) return ''
+ * encode byte data to string
+ * @param {ArrayBuffer} b buffer data
+ * @return {string}
+ */
+base32.encodeToString = (b) => {
+  if (!(b instanceof Buffer)) throw new Error('input not Buffer')
   if (b.length === 0) return ''
 
   let str = ''
@@ -75,3 +80,87 @@ base32.encode = (b) => {
 
   return str
 }
+
+/**
+ * decode base32 string to byte
+ * @param {string} str
+ * @return {ArrayBuffer}
+ */
+base32.decodeFromString = (str) => {
+  if (typeof str !== 'string' || str.length === 0) throw new Error('input not string or empty')
+  if (!/^[A-Z2-7=]+$/.test(str)) throw new Error('Invalid base32 characters')
+  str = str.toUpperCase().replace(/=/g, '')
+
+  let v = []
+  const buf = []
+  const len = str.length
+  const count = len >> 3 << 3
+  let i = 0
+
+  while (i < count) {
+    v[0] = decodeTable[str.charAt(i++)]
+    v[1] = decodeTable[str.charAt(i++)]
+    v[2] = decodeTable[str.charAt(i++)]
+    v[3] = decodeTable[str.charAt(i++)]
+    v[4] = decodeTable[str.charAt(i++)]
+    v[5] = decodeTable[str.charAt(i++)]
+    v[6] = decodeTable[str.charAt(i++)]
+    v[7] = decodeTable[str.charAt(i++)]
+    buf.push(
+      (v[0] << 3 | v[1] >>> 2) & 0xff,
+      (v[1] << 6 | v[2] << 1 | v[3] >>> 4) & 0xff,
+      (v[3] << 4 | v[4] >>> 1) & 0xff,
+      (v[4] << 7 | v[5] << 2 | v[6] >>> 3) & 0xff,
+      (v[6] << 5 | v[7]) & 0xff
+    )
+  }
+
+  switch (len - count) {
+    case 2:
+      v[0] = decodeTable[str.charAt(i++)]
+      v[1] = decodeTable[str.charAt(i++)]
+      buf.push(
+        (v[0] << 3 | v[1] >>> 2) & 0xff
+      )
+      break
+    case 4:
+      v[0] = decodeTable[str.charAt(i++)]
+      v[1] = decodeTable[str.charAt(i++)]
+      v[2] = decodeTable[str.charAt(i++)]
+      v[3] = decodeTable[str.charAt(i++)]
+      buf.push(
+        (v[0] << 3 | v[1] >>> 2) & 0xff,
+        (v[1] << 6 | v[2] << 1 | v[3] >>> 4) & 0xff
+      )
+      break
+    case 5:
+      v[0] = decodeTable[str.charAt(i++)]
+      v[1] = decodeTable[str.charAt(i++)]
+      v[2] = decodeTable[str.charAt(i++)]
+      v[3] = decodeTable[str.charAt(i++)]
+      v[4] = decodeTable[str.charAt(i++)]
+      buf.push(
+        (v[0] << 3 | v[1] >>> 2) & 0xff,
+        (v[1] << 6 | v[2] << 1 | v[3] >>> 4) & 0xff,
+        (v[3] << 4 | v[4] >>> 1) & 0xff
+      )
+      break
+    case 7:
+      v[0] = decodeTable[str.charAt(i++)]
+      v[1] = decodeTable[str.charAt(i++)]
+      v[2] = decodeTable[str.charAt(i++)]
+      v[3] = decodeTable[str.charAt(i++)]
+      v[4] = decodeTable[str.charAt(i++)]
+      v[5] = decodeTable[str.charAt(i++)]
+      v[6] = decodeTable[str.charAt(i++)]
+      buf.push(
+        (v[0] << 3 | v[1] >>> 2) & 0xff,
+        (v[1] << 6 | v[2] << 1 | v[3] >>> 4) & 0xff,
+        (v[3] << 4 | v[4] >>> 1) & 0xff,
+        (v[4] << 7 | v[5] << 2 | v[6] >>> 3) & 0xff
+      )
+      break
+  }
+
+  return Buffer.from(buf)
+}

package-lock.json

@@ -4,6 +4,206 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
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+      "dev": true,
+      "requires": {
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+      }
+    },
+    "@babel/core": {
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+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.7.4.tgz",
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+      "dev": true,
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+        "@babel/template": "^7.7.4",
+        "@babel/traverse": "^7.7.4",
+        "@babel/types": "^7.7.4",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
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+          "dev": true,
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+          "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.1.tgz",
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+          "dev": true,
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+        "lodash": "^4.17.13",
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@@ -106,6 +306,187 @@
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       }
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+        "babel-traverse": "^6.26.0",
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+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.1",
+        "debug": "^2.6.9",
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+        "lodash": "^4.17.4",
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