function getCategoryOptions(category, pname) {
	var str = '';
	var categories = null;
	if (pname == null) {
		pname = '';
	}
	if (category == null) {
		categories = js_category.children;
	} else {
		str = '<option value='+category.id+'>'+pname+category.name+'</option>';
		pname += category.name + '/';
		categories = category.children;
	}
	if (categories != null) {
		for (var i=0; i<categories.length; i++) {
			str += getCategoryOptions(categories[i], pname);
		}
	}
	return str;
}

function getCategory(id, category) {
	var categories = null;
	if (category == null) {
		categories = js_category.children;
	} else {
		categories = category.children;
	}
	for (var i=0; i<categories.length; i++) {
		if (categories[i].id == id)	{
			return categories[i];
		} else if (categories[i].children != null) {
			var c = getCategory(id, categories[i]);
			if (c != null) {
				return c;
			}
		}
	}
	return null;
}

function getCategoryName(id, pname, category) {
	var categories = null;
	if (pname == null)
		pname = "";
	if (category == null) {
		categories = js_category.children;
	} else {
		pname += category.name + "/";
		categories = category.children;
	}
	if (categories != null) {
		for (var i=0; i<categories.length; i++) {
			if (categories[i].id == id)	{
				return pname + categories[i].name;
			} else if (categories[i].children != null) {
				var name = getCategoryName(id, pname, categories[i]);
				if (name != null) {
					return name;
				}
			}
		}
	}
	return null;
}

function getAllChildren(category, children) {
	if (category.children != null) {
		if (children == null)	{
			children = new Array();
		}
		for (var i=0; i<category.children.length; i++) {
			children[children.length] = category.children[i];
			getAllChildren(category.children[i], children);
		}
	}
	return children;
}

//Ext.util.HashMap的支持
function initCategoryHash(hash_c, category, pname) {
	if (category == null) {
		category = js_category;
		pname = '';
	} else {
		if (pname != '') {
			pname += "/";
		}
		pname += category.name;
		category.pname = pname;
		hash_c.add(category.id, category);
	}
	var categories = category.children;
	if (categories != null) {
		for (var i=0; i<categories.length; i++) {
			initCategoryHash(hash_c, categories[i], pname);
		}
	}
}

function getDurationString(duration) {
	if ((duration == null) || (duration == "")) {
		return "00:00:00";
	} else {
		duration = Math.round(duration / 1000);
		var hours = Math.floor(duration / 3600);
		var mins = Math.floor((duration % 3600) / 60);
		var secs = duration % 60;
		return (hours < 10 ? "0"+hours : hours) +":"+ (mins < 10 ? "0"+mins : mins) +":"+ (secs < 10 ? "0"+secs : secs);
	}
}

function formatFloat(num, pos) {
  return Math.round(num * Math.pow(10, pos)) / Math.pow(10, pos);
}

function formatSize(size) {
	var kbyte = 1000;
	var mbyte = 1024*kbyte;
	var gbyte = 1024*mbyte;
	var tbyte = 1024*gbyte;
	if (size <= 0)
		return "0";
	else if ((size > 0) && (size < mbyte))
		return formatFloat((size / kbyte), 2) + "KB";
	else if ((size >= mbyte) && (size < gbyte))
		return formatFloat((size / mbyte), 2) + "MB";
	else if ((size >= gbyte) && (size < tbyte))
		return formatFloat((size / gbyte), 2) + "GB";
	else if (size >= tbyte)
		return formatFloat((size / tbyte), 2) + "TB";
	else
		return size;
}


/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

var Base64 = {

	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	// public method for encoding
	encode : function (input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;

		input = Base64._utf8_encode(input);

		while (i < input.length) {

			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);

			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;

			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}

			output = output +
			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

		}

		return output;
	},

	// public method for decoding
	decode : function (input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;

		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

		while (i < input.length) {

			enc1 = this._keyStr.indexOf(input.charAt(i++));
			enc2 = this._keyStr.indexOf(input.charAt(i++));
			enc3 = this._keyStr.indexOf(input.charAt(i++));
			enc4 = this._keyStr.indexOf(input.charAt(i++));

			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;

			output = output + String.fromCharCode(chr1);

			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}

		}

		output = Base64._utf8_decode(output);

		return output;

	},

	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";

		for (var n = 0; n < string.length; n++) {

			var c = string.charCodeAt(n);

			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}

		return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;

		while ( i < utftext.length ) {

			c = utftext.charCodeAt(i);

			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			}
			else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			}
			else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}

		}

		return string;
	}
}