Support up to node v9 (#110)

* Fix compatibility issues with node 9.

* Fix async tests.

.travis.yml

@@ -5,3 +5,6 @@ node_js:
   - "4"
   - "5"
   - "6"
+  - "7"
+  - "8"
+  - "9"

lib/parser-async.js

@@ -41,6 +41,14 @@ ParserAsync.prototype._handleError = function(err) {
     this._inflate.destroy();
   }
 
+  if (this._filter) {
+    this._filter.destroy();
+    // For backward compatibility with Node 7 and below.
+    // Suppress errors due to _inflate calling write() even after
+    // it's destroy()'ed.
+    this._filter.on('error', function() {});
+  }
+
   this.errord = true;
 };
 

lib/sync-inflate.js

@@ -17,6 +17,10 @@ function Inflate(opts) {
 
   zlib.Inflate.call(this, opts);
 
+  // Node 8 --> 9 compatibility check
+  this._offset = this._offset === undefined ? this._outOffset : this._offset;
+  this._buffer = this._buffer || this._outBuffer;
+
   if (opts && opts.maxLength != null) {
     this._maxLength = opts.maxLength;
   }
@@ -110,6 +114,8 @@ Inflate.prototype._processChunk = function(chunk, flushFlag, asyncCb) {
                                      this._buffer, // out
                                      this._offset, //out_off
                                      availOutBefore); // out_len
+    // Node 8 --> 9 compatibility check
+    res = res || this._writeState;
   } while (!this._hadError && handleChunk(res[0], res[1]));
 
   if (this._hadError) {