Offline Pages: Use 'binary encoding' to create MHTML, instead of base64.

content/browser/download/mhtml_generation_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/download/mhtml_generation_manager.h"
 
 #include <map>
 #include <queue>
 #include <utility>
 
@@ skipping 16 matching lines @@
 #include "net/base/mime_util.h"
 
 namespace content {
 
 // The class and all of its members live on the UI thread.  Only static methods
 // are executed on other threads.
 class MHTMLGenerationManager::Job : public RenderProcessHostObserver {
  public:
   Job(int job_id,
       WebContents* web_contents,
+      bool use_binary_encoding,
       const GenerateMHTMLCallback& callback);
   ~Job() override;
 
   int id() const { return job_id_; }
   void set_browser_file(base::File file) { browser_file_ = std::move(file); }
 
   const GenerateMHTMLCallback& callback() const { return callback_; }
 
   // Handler for FrameHostMsg_SerializeAsMHTMLResponse (a notification from the
   // renderer that the MHTML generation for previous frame has finished).
@@ skipping 33 matching lines @@
   // Creates a new map with values (content ids) the same as in
   // |frame_tree_node_to_content_id_| map, but with the keys translated from
   // frame_tree_node_id into a |site_instance|-specific routing_id.
   std::map<int, std::string> CreateFrameRoutingIdToContentId(
       SiteInstance* site_instance);
 
   // Id used to map renderer responses to jobs.
   // See also MHTMLGenerationManager::id_to_job_ map.
   int job_id_;
 
+  // Whether to use binary encoding while generating MHTML.
+  bool use_binary_encoding_;
+
   // The IDs of frames that still need to be processed.
   std::queue<int> pending_frame_tree_node_ids_;
 
   // Identifies a frame to which we've sent FrameMsg_SerializeAsMHTML but for
   // which we didn't yet process FrameHostMsg_SerializeAsMHTMLResponse via
   // OnSerializeAsMHTMLResponse.
   int frame_tree_node_id_of_busy_frame_;
 
   // The handle to the file the MHTML is saved to for the browser process.
   base::File browser_file_;
@@ skipping 14 matching lines @@
 
   // RAII helper for registering this Job as a RenderProcessHost observer.
   ScopedObserver<RenderProcessHost, MHTMLGenerationManager::Job>
       observed_renderer_process_host_;
 
   DISALLOW_COPY_AND_ASSIGN(Job);
 };
 
 MHTMLGenerationManager::Job::Job(int job_id,
                                  WebContents* web_contents,
+                                 bool use_binary_encoding,
                                  const GenerateMHTMLCallback& callback)
     : job_id_(job_id),
+      use_binary_encoding_(use_binary_encoding),
       frame_tree_node_id_of_busy_frame_(FrameTreeNode::kFrameTreeNodeInvalidId),
       mhtml_boundary_marker_(net::GenerateMimeMultipartBoundary()),
       salt_(base::GenerateGUID()),
       callback_(callback),
       observed_renderer_process_host_(this) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   web_contents->ForEachFrame(base::Bind(
       &MHTMLGenerationManager::Job::AddFrame,
       base::Unretained(this)));  // Safe because ForEachFrame is synchronous.
 
@@ skipping 29 matching lines @@
   return result;
 }
 
 bool MHTMLGenerationManager::Job::SendToNextRenderFrame() {
   DCHECK(browser_file_.IsValid());
   DCHECK(!pending_frame_tree_node_ids_.empty());
 
   FrameMsg_SerializeAsMHTML_Params ipc_params;
   ipc_params.job_id = job_id_;
   ipc_params.mhtml_boundary_marker = mhtml_boundary_marker_;
+  ipc_params.mhtml_binary_encoding = use_binary_encoding_;
 
   int frame_tree_node_id = pending_frame_tree_node_ids_.front();
   pending_frame_tree_node_ids_.pop();
   ipc_params.is_last_frame = pending_frame_tree_node_ids_.empty();
 
   FrameTreeNode* ftn = FrameTreeNode::GloballyFindByID(frame_tree_node_id);
   if (!ftn)  // The contents went away.
     return false;
   RenderFrameHost* rfh = ftn->current_frame_host();
 
@@ skipping 98 matching lines @@
   return base::Singleton<MHTMLGenerationManager>::get();
 }
 
 MHTMLGenerationManager::MHTMLGenerationManager() : next_job_id_(0) {}
 
 MHTMLGenerationManager::~MHTMLGenerationManager() {
   STLDeleteValues(&id_to_job_);
 }
 
 void MHTMLGenerationManager::SaveMHTML(WebContents* web_contents,
+                                       bool use_binary_encoding,
                                        const base::FilePath& file_path,
                                        const GenerateMHTMLCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
-  int job_id = NewJob(web_contents, callback);
+  int job_id = NewJob(web_contents, use_binary_encoding, callback);
 
   BrowserThread::PostTaskAndReplyWithResult(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&MHTMLGenerationManager::CreateFile, file_path),
       base::Bind(&MHTMLGenerationManager::OnFileAvailable,
                  base::Unretained(this),  // Safe b/c |this| is a singleton.
                  job_id));
 }
 
 void MHTMLGenerationManager::OnSerializeAsMHTMLResponse(
@@ skipping 80 matching lines @@
                                           int64_t file_size) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   Job* job = FindJob(job_id);
   job->callback().Run(job_status == JobStatus::SUCCESS ? file_size : -1);
   id_to_job_.erase(job_id);
   delete job;
 }
 
 int MHTMLGenerationManager::NewJob(WebContents* web_contents,
+                                   bool use_binary_encoding,
                                    const GenerateMHTMLCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   int job_id = next_job_id_++;
-  id_to_job_[job_id] = new Job(job_id, web_contents, callback);
+  id_to_job_[job_id] =
+      new Job(job_id, web_contents, use_binary_encoding, callback);
   return job_id;
 }
 
 MHTMLGenerationManager::Job* MHTMLGenerationManager::FindJob(int job_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   IDToJobMap::iterator iter = id_to_job_.find(job_id);
   if (iter == id_to_job_.end()) {
     NOTREACHED();
     return nullptr;
   }
   return iter->second;
 }
 
 void MHTMLGenerationManager::RenderProcessExited(Job* job) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(job);
   JobFinished(job, JobStatus::FAILURE);
 }
 
 }  // namespace content