content/browser/loader/stream_writer.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/loader/stream_writer.h"
   6
   7 #include "base/guid.h"
   8 #include "content/browser/streams/stream.h"
   9 #include "content/browser/streams/stream_registry.h"
  10 #include "content/public/browser/resource_controller.h"
  11 #include "net/base/io_buffer.h"
  12 #include "url/gurl.h"
  13 #include "url/url_constants.h"
  14
  15 namespace content {
  16
  17 StreamWriter::StreamWriter() : controller_(nullptr) {
  18 }
  19
  20 StreamWriter::~StreamWriter() {
  21   if (stream_.get())
  22     Finalize();
  23 }
  24
  25 void StreamWriter::InitializeStream(StreamRegistry* registry,
  26                                     const GURL& origin) {
  27   DCHECK(!stream_.get());
  28
  29   // TODO(tyoshino): Find a way to share this with the blob URL creation in
  30   // WebKit.
  31   GURL url(std::string(url::kBlobScheme) + ":" + origin.spec() +
  32            base::GenerateGUID());
  33   stream_ = new Stream(registry, this, url);
  34 }
  35
  36 void StreamWriter::OnWillRead(scoped_refptr<net::IOBuffer>* buf,
  37                               int* buf_size,
  38                               int min_size) {
  39   static const int kReadBufSize = 32768;
  40
  41   DCHECK(buf);
  42   DCHECK(buf_size);
  43   DCHECK_LE(min_size, kReadBufSize);
  44   if (!read_buffer_.get())
  45     read_buffer_ = new net::IOBuffer(kReadBufSize);
  46   *buf = read_buffer_.get();
  47   *buf_size = kReadBufSize;
  48 }
  49
  50 void StreamWriter::OnReadCompleted(int bytes_read, bool* defer) {
  51   if (!bytes_read)
  52     return;
  53
  54   // We have more data to read.
  55   DCHECK(read_buffer_.get());
  56
  57   // Release the ownership of the buffer, and store a reference
  58   // to it. A new one will be allocated in OnWillRead().
  59   scoped_refptr<net::IOBuffer> buffer;
  60   read_buffer_.swap(buffer);
  61   stream_->AddData(buffer, bytes_read);
  62
  63   if (!stream_->can_add_data())
  64     *defer = true;
  65 }
  66
  67 void StreamWriter::Finalize() {
  68   DCHECK(stream_.get());
  69   stream_->Finalize();
  70   stream_->RemoveWriteObserver(this);
  71   stream_ = nullptr;
  72 }
  73
  74 void StreamWriter::OnSpaceAvailable(Stream* stream) {
  75   controller_->Resume();
  76 }
  77
  78 void StreamWriter::OnClose(Stream* stream) {
  79   controller_->Cancel();
  80 }
  81
  82 }  // namespace content