WWWCache.cs

using UnityEngine;
using System;
using System.Collections;
using System.IO;

/// <summary>
///	Defalult WWW.LoadFromCacheOrDownload() can use only AssetBundle
///	this eneble chaching any file.
/// </summary>
public class WWWCache {
	
	string strToBase64(string str) {
		byte[] byt = System.Text.Encoding.UTF8.GetBytes(str);
		return Convert.ToBase64String(byt);
	}
	
	string base64ToStr(string base64) {
		byte[] b = Convert.FromBase64String(base64);
		return System.Text.Encoding.UTF8.GetString(b);
	}
	
	string urlToCachePath(string url) {
		return Application.persistentDataPath +"/"+ strToBase64(url);
	}
	
	public bool HasCache(string url) {
		return File.Exists(urlToCachePath(url));
	}
	
	public void WriteCache(WWW www) {
		File.WriteAllBytes(urlToCachePath(www.url), www.bytes);
	}
	
	public string CacheUrl(string url) {
		string path = urlToCachePath(url);
		if(File.Exists(path)) {
			return "file://" + path;
		}
		Debug.LogWarning("dont have cache url:"+url);
		return "";
	}
}