Node.js mime module

fs = require('fs');

function MimeMap(data) {
    data = data.replace(/#.*\n/g, '');
    var lines = data.split('\n');
    var i = lines.length - 1;
    var extensionMap = {};
    var contentTypeMap = {};

    while (i--) {
        var fields = lines[i].split(/\s+/);
        contentTypeMap[fields[0]] = fields[1];
        var j = fields.length;

        while (--j) {
            extensionMap[fields[j]] = fields[0];
        }
    }

    this.getContentType = function(path) {
        var parts = path.split(/[\\/]+/);
        var filename = parts[parts.length - 1];
        var matches = filename.match(/\.(.*)$/);

        if (matches) {
            var extension = matches[1];
            return extensionMap[extension];
        }
    };

    this.getExtension = function(contentType) {
        if (contentType in contentTypeMap) {
            return '.' + contentTypeMap[contentType];
        }
    };
}

exports.loads = function(path) {
    var data = fs.readFileSync(path, 'ascii');
    return new MimeMap(data);
};