/// <summary>
/// Gets a file out of the download cache. This does not download the
/// file if it is not in the cache; use "DownloadAndCache" before
/// using this method download the file and cache it.
/// </summary>
/// <param name="baseUri">
/// URI to base relative URI's off of. If null, it defaults to the HTML
/// page's URI.
/// </param>
/// <param name="relativeUri">URI relative to the base URI</param>
/// <returns>A stream for the URI</returns>
protected override Stream GetFileInternal(object baseUri, Uri relativeUri)
{
// check in the XAP first
// TODO: Can this check happen further up?
if (!relativeUri.IsAbsoluteUri)
{
var stream = XapPAL.PAL.VirtualFilesystem.GetFile(relativeUri);
if (stream != null)
{
return(stream);
}
}
var fullUri = DynamicApplication.MakeUri((Uri)baseUri, relativeUri);
if (_cache.Has(fullUri))
{
return(new MemoryStream(System.Text.Encoding.UTF8.GetBytes(_cache[fullUri])));
}
else
{
return(null);
}
}
/// <summary>
/// Gets a file out of the download cache. This does not download the
/// file if it is not in the cache; use "DownloadAndCache" before
/// using this method download the file and cache it.
/// </summary>
/// <param name="baseUri">
/// URI to base relative URI's off of. If null, it defaults to the HTML
/// page's URI.
/// </param>
/// <param name="relativeUri">URI relative to the base URI</param>
/// <returns>A stream for the URI</returns>
protected override Stream GetFileInternal(object baseUri, Uri relativeUri)
{
if (!relativeUri.IsAbsoluteUri)
{
// TODO: HttpVirtualFilesystem shouldn't manage all these checks,
// needs to be re-organized.
// check in the XAP first
var stream = XapPAL.PAL.VirtualFilesystem.GetFile(relativeUri);
if (stream != null)
{
return(stream);
}
// also check any ZIP files
if (HtmlPage.IsEnabled && (DynamicApplication.Current != null && DynamicApplication.Current.ScriptTags != null))
{
foreach (var zip in DynamicApplication.Current.ScriptTags.ZipPackages)
{
var relUriStr = relativeUri.ToString();
var dirname = Path.GetDirectoryName(relUriStr);
if (dirname.Length == 0)
{
continue;
}
var dirs = dirname.Split('/');
if (dirs.Length == 0)
{
continue;
}
var toplevelDir = dirs[0];
if (toplevelDir != Path.GetFileNameWithoutExtension(zip.ToString()))
{
continue;
}
var rest = relUriStr.Split(new string[] { toplevelDir + "/" }, StringSplitOptions.None);
if (rest.Length <= 1)
{
continue;
}
var pathToFileInZip = rest[1];
var file = XapPAL.PAL.VirtualFilesystem.GetFile(
new StreamResourceInfo(GetFileInternal(baseUri, zip), null), pathToFileInZip
);
if (file != null)
{
return(file);
}
}
}
}
var fullUri = DynamicApplication.MakeUri((Uri)baseUri, relativeUri);
if (_cache.Has(fullUri))
{
byte[] bytes = _cache.GetBinary(fullUri);
string strContent = _cache.Get(fullUri);
return(new MemoryStream(
strContent != null ?
System.Text.Encoding.UTF8.GetBytes(strContent) :
bytes
));
}
else
{
return(null);
}
}