From 88bf2739ae5bbec26107ecf4f6d26585eedb36b6 Mon Sep 17 00:00:00 2001
From: Mikeal Rogers <mikeal.rogers@gmail.com>
Date: Fri, 20 Dec 2019 23:07:58 +0000
Subject: [PATCH] fix: name table not hex encoded

---
 src/index.js            | 10 +++++-----
 src/int-table.js        | 12 ++++++++++++
 test/multicodec.spec.js |  2 +-
 3 files changed, 18 insertions(+), 6 deletions(-)
 create mode 100644 src/int-table.js

diff --git a/src/index.js b/src/index.js
index 0be8211..5486fa2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -12,8 +12,8 @@
 'use strict'
 
 const varint = require('varint')
+const intTable = require('./int-table')
 const codecNameToCodeVarint = require('./varint-table')
-const codeToCodecName = require('./name-table')
 const util = require('./util')
 
 exports = module.exports
@@ -57,10 +57,10 @@ exports.rmPrefix = (data) => {
  * @returns {string}
  */
 exports.getCodec = (prefixedData) => {
-  const code = util.varintBufferDecode(prefixedData)
-  const codecName = codeToCodecName[code.toString('hex')]
+  const code = varint.decode(prefixedData)
+  const codecName = intTable.get(code)
   if (codecName === undefined) {
-    throw new Error('Code `0x' + code.toString('hex') + '` not found')
+    throw new Error(`Code ${code} not found`)
   }
   return codecName
 }
@@ -71,7 +71,7 @@ exports.getCodec = (prefixedData) => {
  * @returns {string}
  */
 exports.getName = (codec) => {
-  return codeToCodecName[codec.toString(16)]
+  return intTable.get(codec)
 }
 
 /**
diff --git a/src/int-table.js b/src/int-table.js
new file mode 100644
index 0000000..98b168a
--- /dev/null
+++ b/src/int-table.js
@@ -0,0 +1,12 @@
+'use strict'
+const baseTable = require('./base-table.json')
+
+// map for hexString -> codecName
+const nameTable = new Map()
+
+for (const encodingName in baseTable) {
+  const code = baseTable[encodingName]
+  nameTable.set(code, encodingName)
+}
+
+module.exports = Object.freeze(nameTable)
diff --git a/test/multicodec.spec.js b/test/multicodec.spec.js
index 6b846e2..439794e 100644
--- a/test/multicodec.spec.js
+++ b/test/multicodec.spec.js
@@ -99,7 +99,7 @@ describe('multicodec', () => {
     expect(() => {
       multicodec.getCodec(prefixedBuf)
     }).to.throw(
-      'Code `0xffee` not found'
+      'Code 65518 not found'
     )
   })
 })