feat: add util.cid options

See ipld/interface-ipld-format#40

src/util.js

@@ -66,10 +66,16 @@ const deserialize = (binaryBlob, callback) => {
  * Get the CID of the DAG-Node.
  *
  * @param {ZcashBlock} dagNode - Internal representation of a Zcash block
+ * @param {Object} [options] - Ignored
  * @param {CidCallback} callback - Callback that handles the return value
  * @returns {void}
  */
-const cid = (dagNode, callback) => {
+const cid = (dagNode, options, callback) => {
+  if (options instanceof Function) {
+    callback = options
+    options = {}
+  }
+  options = options || {}
   let err = null
   let cid
   try {

test/util.spec.js

@@ -63,6 +63,17 @@ describe('IPLD format util API cid()', () => {
     })
   })
 
+  it('should encode the CID correctly and ignore options', (done) => {
+    IpldZcash.util.deserialize(fixtureBlock, (err, dagNode) => {
+      expect(err).to.not.exist()
+      verifyCid1(
+        dagNode,
+        { hashAlg: 'unknown' },
+        '5620e1451fd8fecefdd9d443f294bc5ae918301922088ba51d35a2a4672c00000000',
+        done)
+    })
+  })
+
   it('should error on an invalid internal representation', (done) => {
     IpldZcash.util.cid(invalidDagNode, (err, cid) => {
       expect(cid).to.not.exist()
@@ -90,3 +101,11 @@ const verifyCid = (dagNode, expectedCid, doneCb) => {
     doneCb()
   })
 }
+
+const verifyCid1 = (dagNode, options, expectedCid, doneCb) => {
+  IpldZcash.util.cid(dagNode, options, (err, cid) => {
+    expect(err).to.not.exist()
+    expect(cid.multihash.toString('hex')).to.equal(expectedCid)
+    doneCb()
+  })
+}