Support content scheme uri for Chrome on Android

content/browser/android/url_request_content_job.h

+// Copyright (c) 2014 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.
+
+#ifndef CONTENT_BROWSER_ANDROID_URL_REQUEST_CONTENT_JOB_H_
+#define CONTENT_BROWSER_ANDROID_URL_REQUEST_CONTENT_JOB_H_
+
+#include <string>
+#include <vector>
+
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
+#include "net/http/http_byte_range.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_job.h"
+
+namespace base {
+class TaskRunner;
+}
+
+namespace file_util {
+struct FileInfo;
+}
+
+namespace net {
+class FileStream;
+}
+
+namespace content {
+
+// A request job that handles reading content URIs
+class CONTENT_EXPORT URLRequestContentJob : public net::URLRequestJob {
+ public:
+  URLRequestContentJob(
+      net::URLRequest* request,
+      net::NetworkDelegate* network_delegate,
+      const base::FilePath& content_path,
+      const scoped_refptr<base::TaskRunner>& content_task_runner);
+
+  // net::URLRequestJob:
+  void Start() override;
+  void Kill() override;
+  bool ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read) override;
+  bool IsRedirectResponse(GURL* location, int* http_status_code) override;
+  bool GetMimeType(std::string* mime_type) const override;
+  void SetExtraRequestHeaders(const net::HttpRequestHeaders& headers) override;
+
+ protected:
+  ~URLRequestContentJob() override;
+
+ private:
+  // Meta information about the content URI. It's used as a member in the
+  // URLRequestContentJob and also passed between threads because disk access is
+  // necessary to obtain it.
+  struct ContentMetaInfo {
+    ContentMetaInfo();
+    // Flag showing whether the content URI exists.
+    bool content_exists;
+    // Size of the content URI.
+    int64 content_size;
+    // Mime type associated with the content URI.
+    std::string mime_type;
+  };
+
+  // Fetches content URI info on a background thread.
+  static void FetchMetaInfo(const base::FilePath& content_path,
+                            ContentMetaInfo* meta_info);
+
+  // Callback after fetching content URI info on a background thread.
+  void DidFetchMetaInfo(const ContentMetaInfo* meta_info);
+
+  // Callback after opening content URI on a background thread.
+  void DidOpen(int result);
+
+  // Callback after seeking to the beginning of |byte_range_| in the content URI
+  // on a background thread.
+  void DidSeek(int64 result);
+
+  // Callback after data is asynchronously read from the content URI into |buf|.
+  void DidRead(scoped_refptr<net::IOBuffer> buf, int result);
+
+  // The full path of the content URI.
+  base::FilePath content_path_;
+
+  scoped_ptr<net::FileStream> stream_;
+  ContentMetaInfo meta_info_;
+  const scoped_refptr<base::TaskRunner> content_task_runner_;
+
+  net::HttpByteRange byte_range_;
+  int64 remaining_bytes_;
+
+  bool io_pending_;
+
+  base::WeakPtrFactory<URLRequestContentJob> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLRequestContentJob);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_URL_REQUEST_CONTENT_JOB_H_