[ON HOLD] Implement pull-based design for content decoding

net/url_request/url_request_file_job.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.
 
 // For loading files, we make use of overlapped i/o to ensure that reading from
 // the filesystem (e.g., a network filesystem) does not block the calling
 // thread.  An alternative approach would be to use a background thread or pool
 // of threads, but it seems better to leverage the operating system's ability
 // to do background file reads for us.
 //
@@ skipping 15 matching lines @@
 #include "base/strings/string_util.h"
 #include "base/synchronization/lock.h"
 #include "base/task_runner.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "net/base/file_stream.h"
 #include "net/base/filename_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/base/mime_util.h"
-#include "net/filter/filter.h"
+#include "net/filter/gzip_source_stream.h"
+#include "net/filter/source_stream.h"
 #include "net/http/http_util.h"
 #include "net/url_request/url_request_error_job.h"
 #include "net/url_request/url_request_file_dir_job.h"
 #include "url/gurl.h"
 
 #if defined(OS_WIN)
 #include "base/win/shortcut.h"
 #endif
 
 namespace net {
@@ skipping 91 matching lines @@
     return false;
 
   *location = FilePathToFileURL(new_path);
   *http_status_code = 301;
   return true;
 #else
   return false;
 #endif
 }
 
-std::unique_ptr<Filter> URLRequestFileJob::SetupFilter() const {
-  // Bug 9936 - .svgz files needs to be decompressed.
-  return base::LowerCaseEqualsASCII(file_path_.Extension(), ".svgz")
-             ? Filter::GZipFactory()
-             : nullptr;
-}
-
 bool URLRequestFileJob::GetMimeType(std::string* mime_type) const {
   DCHECK(request_);
   if (meta_info_.mime_type_result) {
     *mime_type = meta_info_.mime_type;
     return true;
   }
   return false;
 }
 
 void URLRequestFileJob::SetExtraRequestHeaders(
@@ skipping 20 matching lines @@
 }
 
 void URLRequestFileJob::OnSeekComplete(int64_t result) {}
 
 void URLRequestFileJob::OnReadComplete(IOBuffer* buf, int result) {
 }
 
 URLRequestFileJob::~URLRequestFileJob() {
 }
 
+std::unique_ptr<SourceStream> URLRequestFileJob::SetUpSourceStream() {
+  std::unique_ptr<SourceStream> source = URLRequestJob::SetUpSourceStream();
+  if (!base::LowerCaseEqualsASCII(file_path_.Extension(), ".svgz"))
+    return source;
+
+  return GzipSourceStream::Create(std::move(source),
+                                  GzipSourceStream::GZIP_SOURCE_STREAM_GZIP);
+}
+
 void URLRequestFileJob::FetchMetaInfo(const base::FilePath& file_path,
                                       FileMetaInfo* meta_info) {
   base::File::Info file_info;
   meta_info->file_exists = base::GetFileInfo(file_path, &file_info);
   if (meta_info->file_exists) {
     meta_info->file_size = file_info.size;
     meta_info->is_directory = file_info.is_directory;
   }
   // On Windows GetMimeTypeFromFile() goes to the registry. Thus it should be
   // done in WorkerPool.
@@ skipping 88 matching lines @@
     DCHECK_GE(remaining_bytes_, 0);
   }
 
   OnReadComplete(buf.get(), result);
   buf = NULL;
 
   ReadRawDataComplete(result);
 }
 
 }  // namespace net