hashing function

test suite initialised
samples
package

Author: ka2er

lib/subdb.js

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+var fs = require('fs'),
+	crypto = require('crypto'),
+	ee = require('events').EventEmitter
+	//,
+	//Api = require('./endpoints.js')
+	;
+
+
+var os = module.exports = function() {
+/*
+	this.api = new Api();
+
+	*/
+};
+
+os.prototype.__proto__ = ee.prototype;
+
+/*
+os.prototype.checkMovieHash = function(t_hash, cb) {
+
+};
+*/
+os.prototype.computeHash = function(path, cb) {
+	// get first 64kb
+	// get last 64kb
+	// md5 everything
+
+	var file_size = 0;
+	var chunk_size = 65536;
+	var buf = new Buffer(chunk_size*2);
+	var b_read = 0;
+
+	fs.stat(path, function(err, stat){
+		if(err) return cb(err);
+
+		file_size = stat.size;
+
+		fs.open(path, 'r', function(err, fd) {
+			if(err) return cb(err);
+
+			var t_offsets = [0, file_size-chunk_size];
+			for(var i in t_offsets) {
+				b_read = fs.readSync(fd, buf, b_read, chunk_size, t_offsets[i]);
+			}
+
+			var md5sum = crypto.createHash('md5');
+			md5sum.update(buf);
+			var d = md5sum.digest('hex');
+
+			cb(null, d);
+		});
+	});
+};
+
+

package.json

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+{
+  "author": "ka2er <[email protected]>",
+  "name": "subdb",
+  "description": "API to interact with subdb services",
+  "version": "0.0.1",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/ka2er/node-subdb-api.git"
+  },
+  "bugs": {
+	"url" : "http://github.com/ka2er/node-subdb-api/issues"
+  },
+  "scripts": {
+    "test": "mocha"
+  },  "main": "lib/subdb.js",
+  "dependencies": {
+
+  },
+  "devDependencies": {
+    "mocha":"1.6.0"
+  },
+  "optionalDependencies": {},
+  "engines": {
+    "node": "*"
+  },
+  "keywords": [
+    "subdb",
+    "imdb"
+  ],
+  "license": "GPL"
+}

sample.py

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+import os
+import hashlib
+
+#this hash function receives the name of the file and returns the hash code
+def get_hash(name):
+    readsize = 64 * 1024
+    with open(name, 'rb') as f:
+        data = f.read(readsize)
+        print "%s" % hashlib.md5(data).hexdigest()
+        #print "%0x16%" % data
+        f.seek(-readsize, os.SEEK_END)
+        data2 = f.read(readsize)
+        print "%s" % hashlib.md5(data2).hexdigest()
+        data += data2
+    return hashlib.md5(data).hexdigest()
+
+
+print "%s" % get_hash('./test/dexter.mp4')

test/dexter.mp4

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+/**
+ * User: seb
+ * Date: 03/10/12
+ * Time: 10:07
+ * To change this template use File | Settings | File Templates.
+ */
+
+var assert = require("assert");
+	OS = require("../lib/subdb.js");
+
+describe('Subdb', function() {
+
+	describe('#computeHash()', function(){
+
+		it('should return a subdb hash of the dexter sample file ', function(done){
+			var os = new OS();
+			os.computeHash(process.cwd()+'/test/dexter.mp4', function(err, size){
+				if (err) return done(err);
+				assert.equal(size, 'ffd8d4aa68033dc03d1c8ef373b9028c');
+				done();
+			});
+		});
+
+		it('should return a opensubtitles hash of the justifier sample file ', function(done){
+			var os = new OS();
+			os.computeHash(process.cwd()+'/test/justified.mp4', function(err, size){
+				if (err) return done(err);
+				assert.equal(size, 'edc1981d6459c6111fe36205b4aff6c2');
+				done();
+			});
+		});
+
+
+		it('should return a 128bits length opensubtitles hash of the movie file ', function(done){
+			var os = new OS();
+			os.computeHash(process.cwd()+'/test/justified.mp4', function(err, size){
+				if (err) return done(err);
+				assert.equal(size.length, 'edc1981d6459c6111fe36205b4aff6c2'.length);
+				done();
+			});
+		});
+
+	});
+/*
+	describe('#checkMovieHash', function() {
+		it('should identify justified trailer', function(done) {
+			this.timeout(4000);
+			var os = new OS();
+			os.checkMovieHash(['edc1981d6459c6111fe36205b4aff6c2'], function(err, res) {
+				if(err) return done(err);
+
+				assert.equal(res.data['edc1981d6459c6111fe36205b4aff6c2'], '???');
+				done();
+			});
+		});
+	});
+*/
+});
+