Reading Binary Files with node.js

output

$ ./readMul.sh 
size: 3072, maxID: 256
[ 813, 9, 15 ]
Alchemy 0
[ 1408, 9, 13 ]

Anatomy 0
[ 1395, 13, 13 ]

Animal Lore 0
[ 1372, 21, 13 ]

Item Identification 0
[ 4956, 11, 13 ]

Arms Lore 0
[ 1346, 10, 13 ]
Parrying 0
[ 1337, 9, 13 ]

Begging 0
[ 1322, 13, 13 ]
Blacksmithy 0
[ 1301, 20, 13 ]
Bowcraft/Fletching 0
[ 1288, 13, 13 ]

Peacemaking 0
[ 1279, 9, 15 ]
Camping 0
[ 589, 11, 13 ]
Carpentry 0
[ 1266, 13, 13 ]

Cartography 0
[ 1257, 9, 13 ]
Cooking 0
[ 4938, 18, 13 ]

Detecting Hidden 0
[ 4926, 12, 13 ]

Enticement 0
[ 4901, 25, 13 ]

Evaluating Intelligence 0
[ 1200, 9, 13 ]
Healing 0
[ 1191, 9, 13 ]
Fishing 0
[ 1170, 21, 13 ]

Forensic Evaluation 0
[ 1161, 9, 13 ]
Herding 0
[ 1153, 8, 13 ]

Hiding 0
[ 1138, 13, 13 ]

Provocation 0
[ 1123, 13, 13 ]

Inscription 0
[ 1110, 13, 13 ]
Lockpicking 0
[ 4893, 8, 14 ]
Magery 0
[ 1072, 9, 13 ]
Tactics 0
[ 4865, 10, 13 ]
Snooping 0
[ 1049, 14, 13 ]
Musicianship 0
[ 1038, 11, 13 ]

Poisoning 0
[ 1022, 9, 13 ]
Archery 0
[ 1008, 14, 13 ]

Spirit Speak 0
[ 4875, 18, 13 ]
Resisting Spells 0
[ 830, 10, 14 ]

Stealing 0
[ 997, 11, 13 ]
Tailoring 0
[ 4850, 15, 13 ]

Animal Taming 0
[ 4828, 22, 13 ]

Taste Identification 0
[ 952, 11, 13 ]
Tinkering 0
[ 942, 10, 13 ]

Tracking 0
[ 928, 12, 13 ]
Veterinary 0
[ 909, 15, 13 ]
Swordsmanship 0
[ 892, 15, 13 ]
Mace Fighting 0
[ 871, 9, 13 ]
Fencing 0
[ 850, 11, 13 ]
Wrestling 0
[ 4805, 8, 2 ]
Mining 0
[ 4967, 12, 1 ]

Meditation 0
[ 4813, 15, 2 ]
Lumberjacking 0
[ 4992, 9, 1 ]

Stealth 0
[ 4979, 13, 1 ]

Remove Trap 0

readMul.sh

#!/usr/bin/nodejs

var fs = require("fs");
var jParser = require('jParser');

var mulIndex = "skills.idx";
var mulData = "skills.mul";

var stats = fs.statSync(mulIndex);

var fileSizeInBytes = stats["size"];
var maxIndex = fileSizeInBytes/12;

console.log("size: "+fileSizeInBytes+", maxID: "+maxIndex);

var mulParser = function(entry) {
	var pos = entry[0];
	var length = entry[1];

	fs.readFile(mulData, function(err, data){
		var parser = new jParser(data, {
			isAction: ['uint8', 1],
			name: ['string', length-1]			
		});
		parser.seek(pos);
		console.log(entry);
		console.log(parser.parse('name')+" "+parser.parse('isAction'));
	});
}

var idxParser = function(err, data) {
	var parser = new jParser(data, {
		// lookup, length, extra
    	entry: ['array', 'int32', 3]
  	});
  	for(var i=0; i < maxIndex; i++) {
		parser.seek(i*12);
		entry = parser.parse('entry');		
		if(entry[0] >= 0){
			mulParser(entry);	
		} else {
			break;
		}
	}
}

fs.readFile(mulIndex, idxParser);