Use class to support to support Node.js v8.0.0

.travis.yml

@@ -1,9 +1,8 @@
 sudo: false
 language: node_js
 node_js:
+  - 8
+  - 7
   - 6
-  - 4
-  - '0.12'
-  - '0.10'
 matrix:
-  fast_finish: true
+  fast_finish: true

appveyor.yml

@@ -1,9 +1,8 @@
 environment:
   matrix:
+    - nodejs_version: '8'
+    - nodejs_version: '7'
     - nodejs_version: '6'
-    - nodejs_version: '4'
-    - nodejs_version: '0.12'
-    - nodejs_version: '0.10'
 install:
   - ps: Install-Product node $env:nodejs_version
   - set CI=true
@@ -19,4 +18,4 @@ clone_depth: 1
 test_script:
   - node --version
   - npm --version
-  - npm test
+  - npm test

lib/deflate-crc32-stream.js

@@ -7,63 +7,54 @@
  */
 var zlib = require('zlib');
 var inherits = require('util').inherits;
-
 var crc32 = require('crc').crc32;
 
-var DeflateCRC32Stream = module.exports = function (options) {
-  zlib.DeflateRaw.call(this, options);
-
-  this.checksum = new Buffer(4);
-  this.checksum.writeInt32BE(0, 0);
+class DeflateCRC32Stream extends zlib.DeflateRaw {
+  constructor(options) {
+    super(options);
+    this.checksum = new Buffer(4);
+    this.checksum.writeInt32BE(0, 0);
 
-  this.rawSize = 0;
-  this.compressedSize = 0;
-
-  // BC v0.8
-  if (typeof zlib.DeflateRaw.prototype.push !== 'function') {
-    this.on('data', function(chunk) {
-      if (chunk) {
-        this.compressedSize += chunk.length;
-      }
-    });
+    this.rawSize = 0;
+    this.compressedSize = 0;
   }
-};
 
-inherits(DeflateCRC32Stream, zlib.DeflateRaw);
+  push(chunk, encoding) {
+    if (chunk) {
+      this.compressedSize += chunk.length;
+    }
 
-DeflateCRC32Stream.prototype.push = function(chunk, encoding) {
-  if (chunk) {
-    this.compressedSize += chunk.length;
+    return zlib.DeflateRaw.prototype.push.call(this, chunk, encoding);
   }
 
-  return zlib.DeflateRaw.prototype.push.call(this, chunk, encoding);
-};
+  write(chunk, enc, cb) {
+    if (chunk) {
+      this.checksum = crc32(chunk, this.checksum);
+      this.rawSize += chunk.length;
+    }
 
-DeflateCRC32Stream.prototype.write = function(chunk, enc, cb) {
-  if (chunk) {
-    this.checksum = crc32(chunk, this.checksum);
-    this.rawSize += chunk.length;
+    return zlib.DeflateRaw.prototype.write.call(this, chunk, enc, cb);
   }
 
-  return zlib.DeflateRaw.prototype.write.call(this, chunk, enc, cb);
-};
-
-DeflateCRC32Stream.prototype.digest = function(encoding) {
-  var checksum = new Buffer(4);
-  checksum.writeUInt32BE(this.checksum >>> 0, 0);
-  return encoding ? checksum.toString(encoding) : checksum;
-};
+  digest(encoding) {
+    var checksum = new Buffer(4);
+    checksum.writeUInt32BE(this.checksum >>> 0, 0);
+    return encoding ? checksum.toString(encoding) : checksum;
+  }
 
-DeflateCRC32Stream.prototype.hex = function() {
-  return this.digest('hex').toUpperCase();
-};
+  hex() {
+    return this.digest('hex').toUpperCase();
+  }
 
-DeflateCRC32Stream.prototype.size = function(compressed) {
-  compressed = compressed || false;
+  size(compressed) {
+    compressed = compressed || false;
 
-  if (compressed) {
-    return this.compressedSize;
-  } else {
-    return this.rawSize;
+    if (compressed) {
+      return this.compressedSize;
+    } else {
+      return this.rawSize;
+    }
   }
-};
+}
+
+module.exports = DeflateCRC32Stream