ECMAscript 6 compatible version

README.md

@@ -1,5 +1,9 @@
 # MurmurHash.js
 
+All credit for implementation the hashing function goes to  Gary Court's. I just added an export statement for ECMAScript 6 compatibility.
+
+---
+
 An optimized JavaScript implementation of the MurmurHash algorithms.
 
 These algorithms take a JavaScript string (and a seed), and quickly create a non-cryptographic 32-bit hash from it. And by quick I mean sub-millisecond performance.
@@ -17,4 +21,4 @@ Permission is hereby granted, free of charge, to any person obtaining a copy of
 
 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

murmurhash3_gc.js

@@ -1,64 +1,69 @@
 /**
+ *
+ * Ecmascript 6 module of gary court's amazing work.
+ * I just added the export statement and provided the npm configuration.
+ *
  * JS Implementation of MurmurHash3 (r136) (as of May 20, 2011)
- * 
+ *
  * @author <a href="mailto:[email protected]">Gary Court</a>
  * @see http://github.com/garycourt/murmurhash-js
  * @author <a href="mailto:[email protected]">Austin Appleby</a>
  * @see http://sites.google.com/site/murmurhash/
- * 
+ *
  * @param {string} key ASCII only
  * @param {number} seed Positive integer only
- * @return {number} 32-bit positive integer hash 
+ * @return {number} 32-bit positive integer hash
  */
 
 function murmurhash3_32_gc(key, seed) {
-	var remainder, bytes, h1, h1b, c1, c1b, c2, c2b, k1, i;
-
-	remainder = key.length & 3; // key.length % 4
-	bytes = key.length - remainder;
-	h1 = seed;
-	c1 = 0xcc9e2d51;
-	c2 = 0x1b873593;
-	i = 0;
-
-	while (i < bytes) {
-	  	k1 = 
-	  	  ((key.charCodeAt(i) & 0xff)) |
-	  	  ((key.charCodeAt(++i) & 0xff) << 8) |
-	  	  ((key.charCodeAt(++i) & 0xff) << 16) |
-	  	  ((key.charCodeAt(++i) & 0xff) << 24);
-		++i;
-
-		k1 = ((((k1 & 0xffff) * c1) + ((((k1 >>> 16) * c1) & 0xffff) << 16))) & 0xffffffff;
-		k1 = (k1 << 15) | (k1 >>> 17);
-		k1 = ((((k1 & 0xffff) * c2) + ((((k1 >>> 16) * c2) & 0xffff) << 16))) & 0xffffffff;
+  var remainder, bytes, h1, h1b, c1, c1b, c2, c2b, k1, i;
 
-		h1 ^= k1;
-        h1 = (h1 << 13) | (h1 >>> 19);
-		h1b = ((((h1 & 0xffff) * 5) + ((((h1 >>> 16) * 5) & 0xffff) << 16))) & 0xffffffff;
-		h1 = (((h1b & 0xffff) + 0x6b64) + ((((h1b >>> 16) + 0xe654) & 0xffff) << 16));
-	}
-
-	k1 = 0;
-
-	switch (remainder) {
-		case 3: k1 ^= (key.charCodeAt(i + 2) & 0xff) << 16;
-		case 2: k1 ^= (key.charCodeAt(i + 1) & 0xff) << 8;
-		case 1: k1 ^= (key.charCodeAt(i) & 0xff);
-
-		k1 = (((k1 & 0xffff) * c1) + ((((k1 >>> 16) * c1) & 0xffff) << 16)) & 0xffffffff;
-		k1 = (k1 << 15) | (k1 >>> 17);
-		k1 = (((k1 & 0xffff) * c2) + ((((k1 >>> 16) * c2) & 0xffff) << 16)) & 0xffffffff;
-		h1 ^= k1;
-	}
-
-	h1 ^= key.length;
+  remainder = key.length & 3; // key.length % 4
+  bytes = key.length - remainder;
+  h1 = seed;
+  c1 = 0xcc9e2d51;
+  c2 = 0x1b873593;
+  i = 0;
 
-	h1 ^= h1 >>> 16;
-	h1 = (((h1 & 0xffff) * 0x85ebca6b) + ((((h1 >>> 16) * 0x85ebca6b) & 0xffff) << 16)) & 0xffffffff;
-	h1 ^= h1 >>> 13;
-	h1 = ((((h1 & 0xffff) * 0xc2b2ae35) + ((((h1 >>> 16) * 0xc2b2ae35) & 0xffff) << 16))) & 0xffffffff;
-	h1 ^= h1 >>> 16;
+  while (i < bytes) {
+    k1 = key.charCodeAt(i) & 0xff | (key.charCodeAt(++i) & 0xff) << 8 | (key.charCodeAt(++i) & 0xff) << 16 | (key.charCodeAt(++i) & 0xff) << 24;
+    ++i;
 
-	return h1 >>> 0;
-}
+    k1 = (k1 & 0xffff) * c1 + (((k1 >>> 16) * c1 & 0xffff) << 16) & 0xffffffff;
+    k1 = k1 << 15 | k1 >>> 17;
+    k1 = (k1 & 0xffff) * c2 + (((k1 >>> 16) * c2 & 0xffff) << 16) & 0xffffffff;
+
+    h1 ^= k1;
+    h1 = h1 << 13 | h1 >>> 19;
+    h1b = (h1 & 0xffff) * 5 + (((h1 >>> 16) * 5 & 0xffff) << 16) & 0xffffffff;
+    h1 = (h1b & 0xffff) + 0x6b64 + (((h1b >>> 16) + 0xe654 & 0xffff) << 16);
+  }
+
+  k1 = 0;
+
+  switch (remainder) {
+    case 3:
+      k1 ^= (key.charCodeAt(i + 2) & 0xff) << 16;
+    case 2:
+      k1 ^= (key.charCodeAt(i + 1) & 0xff) << 8;
+    case 1:
+      k1 ^= key.charCodeAt(i) & 0xff;
+
+      k1 = (k1 & 0xffff) * c1 + (((k1 >>> 16) * c1 & 0xffff) << 16) & 0xffffffff;
+      k1 = k1 << 15 | k1 >>> 17;
+      k1 = (k1 & 0xffff) * c2 + (((k1 >>> 16) * c2 & 0xffff) << 16) & 0xffffffff;
+      h1 ^= k1;
+  }
+
+  h1 ^= key.length;
+
+  h1 ^= h1 >>> 16;
+  h1 = (h1 & 0xffff) * 0x85ebca6b + (((h1 >>> 16) * 0x85ebca6b & 0xffff) << 16) & 0xffffffff;
+  h1 ^= h1 >>> 13;
+  h1 = (h1 & 0xffff) * 0xc2b2ae35 + (((h1 >>> 16) * 0xc2b2ae35 & 0xffff) << 16) & 0xffffffff;
+  h1 ^= h1 >>> 16;
+
+  return h1 >>> 0;
+}
+
+exports.generate = murmurhash3_32_gc;

package.json

@@ -0,0 +1,22 @@
+{
+    "name": "es6-murmurhash",
+    "version": "0.0.1",
+    "description": "A ECMAScript 6 module for the optimised JavaScript implementation of the MurmurHash algorithms.",
+    "author": {
+        "name": "Gary Court",
+        "email": "[email protected]"
+    },
+    "contributors": [{
+        "name": "Martin Krause",
+        "email": "[email protected]",
+        "url": "http://mkrause.info"
+    }],
+    "main": "murmurhash3_gc",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/martinkr/murmurhash-js"
+    },
+    "license": "MIT",
+    "keywords": ["ECMAscript 6", "hash", "murmurhash"],
+    "bugs": "https://github.com/martinkr/murmurhash-js"
+}