text: // Copyright (c) 2013 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/loader/stream_resource_handler.h"
  
  #include "base/guid.h"
  #include "base/logging.h"
  #include "content/browser/streams/stream.h"
  #include "content/browser/streams/stream_registry.h"
  #include "content/public/browser/resource_controller.h"
  #include "content/public/common/url_constants.h"
  #include "net/base/io_buffer.h"
  #include "net/url_request/url_request_status.h"
  
  namespace content {
  
  StreamResourceHandler::StreamResourceHandler(net::URLRequest* request,
                                               StreamRegistry* registry,
                                               const GURL& origin)
      : ResourceHandler(request),
        read_buffer_(NULL) {
    // TODO(tyoshino): Find a way to share this with the blob URL creation in
    // WebKit.
    GURL url(std::string(kBlobScheme) + ":" + origin.spec() +
             base::GenerateGUID());
    stream_ = new Stream(registry, this, url);
  }
  
  StreamResourceHandler::~StreamResourceHandler() {
    stream_->RemoveWriteObserver(this);
  }
  
  bool StreamResourceHandler::OnUploadProgress(int request_id,
                                               uint64 position,
                                               uint64 size) {
    return true;
  }
  
  bool StreamResourceHandler::OnRequestRedirected(int request_id,
                                                  const GURL& url,
                                                  ResourceResponse* resp,
                                                  bool* defer) {
    return true;
  }
  
  bool StreamResourceHandler::OnResponseStarted(int request_id,
                                                ResourceResponse* resp,
                                                bool* defer) {
    return true;
  }
  
  bool StreamResourceHandler::OnWillStart(int request_id,
                                          const GURL& url,
                                          bool* defer) {
    return true;
  }
  
  bool StreamResourceHandler::OnBeforeNetworkStart(int request_id,
                                                   const GURL& url,
                                                   bool* defer) {
    return true;
  }
  
  bool StreamResourceHandler::OnWillRead(int request_id,
                                         scoped_refptr<net::IOBuffer>* buf,
                                         int* buf_size,
                                         int min_size) {
    static const int kReadBufSize = 32768;
  
    DCHECK(buf && buf_size);
    if (!read_buffer_.get())
      read_buffer_ = new net::IOBuffer(kReadBufSize);
    *buf = read_buffer_.get();
    *buf_size = kReadBufSize;
  
    return true;
  }
  
  bool StreamResourceHandler::OnReadCompleted(int request_id,
                                              int bytes_read,
                                              bool* defer) {
    if (!bytes_read)
      return true;
  
    // We have more data to read.
    DCHECK(read_buffer_.get());
  
    // Release the ownership of the buffer, and store a reference
    // to it. A new one will be allocated in OnWillRead().
    net::IOBuffer* buffer = NULL;
    read_buffer_.swap(&buffer);
    stream_->AddData(buffer, bytes_read);
  
    if (!stream_->can_add_data())
      *defer = true;
  
    return true;
  }
  
  void StreamResourceHandler::OnResponseCompleted(
      int request_id,
      const net::URLRequestStatus& status,
      const std::string& sec_info,
      bool* defer) {
    stream_->Finalize();
  }
  
  void StreamResourceHandler::OnDataDownloaded(
      int request_id,
      int bytes_downloaded) {
    NOTREACHED();
  }
  
  void StreamResourceHandler::OnSpaceAvailable(Stream* stream) {
    controller()->Resume();
  }
  
  void StreamResourceHandler::OnClose(Stream* stream) {
    controller()->Cancel();
  }
  
  }  // namespace content
  