components/nacl/renderer/manifest_downloader.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6
   7 #include "base/callback.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "components/nacl/renderer/ppb_nacl_private.h"
  10 #include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
  11
  12 namespace blink {
  13 struct WebURLError;
  14 class WebURLLoader;
  15 class WebURLResponse;
  16 }
  17
  18 namespace nacl {
  19
  20 // Downloads a NaCl manifest (.nmf) and returns the contents of the file to
  21 // caller through a callback.
  22 class ManifestDownloader : public blink::WebURLLoaderClient {
  23  public:
  24   typedef base::Callback<void(PP_NaClError, const std::string&)> Callback;
  25
  26   // This is a pretty arbitrary limit on the byte size of the NaCl manifest
  27   // file.
  28   // Note that the resulting string object has to have at least one byte extra
  29   // for the null termination character.
  30   static const size_t kNaClManifestMaxFileBytes = 1024 * 1024;
  31
  32   ManifestDownloader(scoped_ptr<blink::WebURLLoader> url_loader,
  33                      bool is_installed,
  34                      Callback cb);
  35   virtual ~ManifestDownloader();
  36
  37   void Load(const blink::WebURLRequest& request);
  38
  39  private:
  40   void Close();
  41
  42   // WebURLLoaderClient implementation.
  43   virtual void didReceiveResponse(blink::WebURLLoader* loader,
  44                                   const blink::WebURLResponse& response);
  45   virtual void didReceiveData(blink::WebURLLoader* loader,
  46                               const char* data,
  47                               int data_length,
  48                               int encoded_data_length);
  49   virtual void didFinishLoading(blink::WebURLLoader* loader,
  50                                 double finish_time,
  51                                 int64_t total_encoded_data_length);
  52   virtual void didFail(blink::WebURLLoader* loader,
  53                        const blink::WebURLError& error);
  54
  55   scoped_ptr<blink::WebURLLoader> url_loader_;
  56   bool is_installed_;
  57   Callback cb_;
  58   std::string buffer_;
  59   int status_code_;
  60   PP_NaClError pp_nacl_error_;
  61 };
  62
  63 }  // namespace nacl