fix: handle variable sized protocols in protoCodes

src/codec.js

@@ -27,7 +27,9 @@ module.exports = {
   cleanPath: cleanPath,
 
   ParseError: ParseError,
-  protoFromTuple: protoFromTuple
+  protoFromTuple: protoFromTuple,
+
+  sizeForAddr: sizeForAddr
 }
 
 // string -> [[str name, str addr]... ]

src/index.js

@@ -62,14 +62,20 @@ Multiaddr.prototype.protos = function protos () {
 
 // get the multiaddr protocol codes
 Multiaddr.prototype.protoCodes = function protoCodes () {
-  var codes = []
-  for (var i = 0; i < this.buffer.length; i++) {
-    var code = varint.decode(this.buffer, i)
-    var size = protocols(code).size / 8
-    i = i + varint.decode.bytes - 1
-    i += size // skip over proto data
+  const codes = []
+  const buf = this.buffer
+  let i = 0
+  while (i < buf.length) {
+    const code = varint.decode(buf, i)
+    const n = varint.decode.bytes
+
+    const p = protocols(code)
+    const size = codec.sizeForAddr(p, buf.slice(i + n))
+
+    i += (size + n)
     codes.push(code)
   }
+
   return codes
 }
 

test/index.spec.js

@@ -323,6 +323,24 @@ describe('helpers', () => {
         size: 0
       }])
     })
+
+    it('works with ipfs', () => {
+      expect(
+        multiaddr('/ip4/0.0.0.0/utp/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC').protos()
+      ).to.be.eql([{
+        code: 4,
+        name: 'ip4',
+        size: 32
+      }, {
+        code: 302,
+        name: 'utp',
+        size: 0
+      }, {
+        code: 421,
+        name: 'ipfs',
+        size: -1
+      }])
+    })
   })
 
   describe('.tuples', () => {