<% @ Language = "javascript" CodePage="1252" %>
<% @ import namespace = System.Diagnostics %>
<% @ import namespace = System.IO %>
<%

var w = getIntMust("w")
  , h = getIntMust("h")
  , img = get("img");

if (img)
  if (fileExists(Server.MapPath(''),img))
    resizeImage(Server.MapPath(img),w,h);
  else
    throw "File " + img + " does not exist";
else
  // TODO: some other kind of error handler?
   throw "No image filename provided.";


function resizeImage(img,w,h) {
  var compiler = new Process();
  compiler.StartInfo.FileName = Server.MapPath("convert.exe");
  compiler.StartInfo.Arguments = " -resize "+w+"x"+h+" \"" + img + "\" jpg:-";
  compiler.StartInfo.UseShellExecute = false;
  compiler.StartInfo.RedirectStandardOutput = true;
  compiler.Start();
  Response.ContentType = "image/JPEG";
  Response.Write(compiler.StandardOutput.ReadToEnd());
  Response.End();
}

function fileExists(dir,name) {
  return find (Directory.GetFiles(dir),function(file){
      return name == file.replace(/^.+\\(.+)$/,"$1");
    });
}

function find(array,pred) {
  if (!array) return null;
  for (var i = 0; i < array.length; i++)
    if (pred(array[i])) return array[i];
  return null;
}

function getIntMust(key) {
  var v = get(key);
  if (v) return v*1;
  else throw key + " not provided.";
}

function get(key) {
  var v = Request.QueryString(key);
  if (typeof (0+v)!="string") return null;
  else return v;
}

%>