[NaCl SDK] Cleanup examples.

native_client_sdk/src/examples/api/url_loader/geturl_handler.h

-// 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.
-
-#ifndef EXAMPLES_GETURL_GETURL_HANDLER_H_
-#define EXAMPLES_GETURL_GETURL_HANDLER_H_
-
-#include <string>
-#include "ppapi/cpp/completion_callback.h"
-#include "ppapi/cpp/url_loader.h"
-#include "ppapi/cpp/url_request_info.h"
-#include "ppapi/cpp/instance.h"
-#include "ppapi/utility/completion_callback_factory.h"
-#define READ_BUFFER_SIZE 32768
-
-// GetURLHandler is used to download data from |url|. When download is
-// finished or when an error occurs, it posts a message back to the browser
-// with the results encoded in the message as a string and self-destroys.
-//
-// pp::URLLoader.GetDownloadProgress() is used to to allocate the memory
-// required for url_response_body_ before the download starts.  (This is not so
-// much of a performance improvement, but it saves some memory since
-// std::string.insert() typically grows the string's capacity by somewhere
-// between 50% to 100% when it needs more memory, depending on the
-// implementation.)  Other performance improvements made as outlined in this
-// bug: http://code.google.com/p/chromium/issues/detail?id=103947
-//
-// EXAMPLE USAGE:
-// GetURLHandler* handler* = GetURLHandler::Create(instance,url);
-// handler->Start();
-//
-class GetURLHandler {
- public:
-  // Creates instance of GetURLHandler on the heap.
-  // GetURLHandler objects shall be created only on the heap (they
-  // self-destroy when all data is in).
-  static GetURLHandler* Create(pp::Instance* instance_, const std::string& url);
-  // Initiates page (URL) download.
-  void Start();
-
- private:
-  GetURLHandler(pp::Instance* instance_, const std::string& url);
-  ~GetURLHandler();
-
-  // Callback for the pp::URLLoader::Open().
-  // Called by pp::URLLoader when response headers are received or when an
-  // error occurs (in response to the call of pp::URLLoader::Open()).
-  // Look at <ppapi/c/ppb_url_loader.h> and
-  // <ppapi/cpp/url_loader.h> for more information about pp::URLLoader.
-  void OnOpen(int32_t result);
-
-  // Callback for the pp::URLLoader::ReadResponseBody().
-  // |result| contains the number of bytes read or an error code.
-  // Appends data from this->buffer_ to this->url_response_body_.
-  void OnRead(int32_t result);
-
-  // Reads the response body (asynchronously) into this->buffer_.
-  // OnRead() will be called when bytes are received or when an error occurs.
-  void ReadBody();
-
-  // Append data bytes read from the URL onto the internal buffer.  Does
-  // nothing if |num_bytes| is 0.
-  void AppendDataBytes(const char* buffer, int32_t num_bytes);
-
-  // Post a message back to the browser with the download results.
-  void ReportResult(const std::string& fname,
-                    const std::string& text,
-                    bool success);
-  // Post a message back to the browser with the download results and
-  // self-destroy.  |this| is no longer valid when this method returns.
-  void ReportResultAndDie(const std::string& fname,
-                          const std::string& text,
-                          bool success);
-
-  pp::Instance* instance_;  // Weak pointer.
-  std::string url_;         // URL to be downloaded.
-  pp::URLRequestInfo url_request_;
-  pp::URLLoader url_loader_;  // URLLoader provides an API to download URLs.
-  char* buffer_;              // Temporary buffer for reads.
-  std::string url_response_body_;  // Contains accumulated downloaded data.
-  pp::CompletionCallbackFactory<GetURLHandler> cc_factory_;
-
-  GetURLHandler(const GetURLHandler&);
-  void operator=(const GetURLHandler&);
-};
-
-#endif  // EXAMPLES_GETURL_GETURL_HANDLER_H_