Merge pull request #3 from visionmedia/master

Buffer support + tests

.gitignore

@@ -0,0 +1 @@
+node_modules

Makefile

@@ -0,0 +1,7 @@
+
+test:
+	@./node_modules/.bin/mocha \
+	  --require should \
+	  --reporter spec
+
+.PHONY: test

README.md

@@ -25,3 +25,7 @@ or
 
     npm install crc
 
+## Running tests
+
+    $ npm install
+    $ make test

lib/crc.js

@@ -247,12 +247,20 @@
 			crc = 0
 			;
 
-		for(i = 0; i < len; i++)
+		for(var i = 0; i < len; i++)
 			crc = crc8Add(crc, str.charCodeAt(i));
 
 		return crc;
 	};
 
+  function crc8Buffer(buf) {
+    var crc = 0;
+    for (var i = 0, len = buf.length; i < len; ++i) {
+      crc = crc8Add(crc, buf[i]);
+    }
+    return crc;
+  }
+
 	function crcArc(str)
 	{
 		var i,
@@ -279,6 +287,14 @@
 		return crc;
 	};
 
+  function crc16Buffer(buf) {
+    var crc = 0;
+    for (var i = 0, len = buf.length; i < len; ++i) {
+      crc = crc16Add(crc, buf[i]);
+    }
+    return crc;
+  }
+
 	function fcs16(str)
 	{
 		var i,
@@ -305,6 +321,14 @@
 		return crc^0xFFFFFFFF;
 	};
 
+  function crc32Buffer(buf) {
+    var crc = 0xFFFFFFFF;
+    for (var i = 0, len = buf.length; i < len; ++i) {
+      crc = crc32Add(crc, buf[i]);
+    }
+    return crc ^ 0xFFFFFFFF;
+  }
+
 	/**
 	 * Convert value as 8-bit unsigned integer to 2 digit hexadecimal number.
 	 */
@@ -357,6 +381,11 @@
 		'crc32'		: crc32,
 		'hex8'		: hex8,
 		'hex16'		: hex16,
-		'hex32'		: hex32
+		'hex32'		: hex32,
+		'buffer'  : {
+		  crc8: crc8Buffer,
+		  crc16: crc16Buffer,
+		  crc32: crc32Buffer
+		}
 	};
 })();

package.json

@@ -7,6 +7,10 @@
 	"main": "./lib/crc.js",
 	"scripts": {},
 	"directories" : {},
+	"devDependencies": {
+	  "mocha": "*",
+	  "should": "*"
+	},
 	"repository": {
 		"type": "git",
 		"url": "git://github.com/alexgorbatchev/node-crc.git"

test/crc.js

@@ -0,0 +1,63 @@
+#!/usr/bin/env ./nodeunit/bin/nodeunit
+
+var crc = require('../lib/crc');
+
+describe('crc8()', function(){
+  it('should work with strings', function(){
+    crc.crc8('hello world').should.equal(64);
+  })
+
+  it('should work with Buffers', function(){
+    crc.buffer.crc8(new Buffer('hello world')).should.equal(64);
+  })
+})
+
+describe('crc16()', function(){
+  it('should work with strings', function(){
+    crc.crc16('hello world').should.equal(15332);
+  })
+
+  it('should work with Buffers', function(){
+    crc.buffer.crc16(new Buffer('hello world')).should.equal(15332);
+  })
+})
+
+describe('crc32()', function(){
+  it('should work with strings', function(){
+    crc.crc32('hello world').should.equal(222957957);
+  })
+
+  it('should work with Buffers', function(){
+    crc.buffer.crc32(new Buffer('hello world')).should.equal(222957957);
+  })
+})
+
+describe('crcArc()', function(){
+  it('should work with strings', function(){
+    crc.crcArc('hello world').should.equal(14785);
+  })
+})
+
+describe('fcs16()', function(){
+  it('should work with strings', function(){
+    crc.fcs16('hello world').should.equal(44550);
+  })
+})
+
+describe('hex8()', function(){
+  it('should work with strings', function(){
+    crc.hex8(64).should.equal('40');
+  })
+})
+
+describe('hex16()', function(){
+  it('should work with strings', function(){
+    crc.hex16(15332).should.equal('3BE4');
+  })
+})
+
+describe('hex32()', function(){
+  it('should work with strings', function(){
+    crc.hex32(222957957).should.equal('0D4A1185');
+  })
+})