Add support for reading blobs when using the network service.

content/network/net_adapters.cc

-// Copyright 2017 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/network/net_adapters.h"
-
-#include "net/base/net_errors.h"
-
-namespace content {
-
-namespace {
-const uint32_t kMaxBufSize = 64 * 1024;
-}
-
-NetToMojoPendingBuffer::NetToMojoPendingBuffer(
-    mojo::ScopedDataPipeProducerHandle handle,
-    void* buffer)
-    : handle_(std::move(handle)), buffer_(buffer) {}
-
-NetToMojoPendingBuffer::~NetToMojoPendingBuffer() {
-  if (handle_.is_valid())
-    EndWriteDataRaw(handle_.get(), 0);
-}
-
-MojoResult NetToMojoPendingBuffer::BeginWrite(
-    mojo::ScopedDataPipeProducerHandle* handle,
-    scoped_refptr<NetToMojoPendingBuffer>* pending,
-    uint32_t* num_bytes) {
-  void* buf;
-  *num_bytes = 0;
-  MojoResult result = BeginWriteDataRaw(handle->get(), &buf, num_bytes,
-                                        MOJO_WRITE_DATA_FLAG_NONE);
-  if (result == MOJO_RESULT_OK) {
-    if (*num_bytes > kMaxBufSize)
-      *num_bytes = kMaxBufSize;
-    *pending = new NetToMojoPendingBuffer(std::move(*handle), buf);
-  }
-  return result;
-}
-
-mojo::ScopedDataPipeProducerHandle NetToMojoPendingBuffer::Complete(
-    uint32_t num_bytes) {
-  EndWriteDataRaw(handle_.get(), num_bytes);
-  buffer_ = NULL;
-  return std::move(handle_);
-}
-
-NetToMojoIOBuffer::NetToMojoIOBuffer(NetToMojoPendingBuffer* pending_buffer)
-    : net::WrappedIOBuffer(pending_buffer->buffer()),
-      pending_buffer_(pending_buffer) {}
-
-NetToMojoIOBuffer::~NetToMojoIOBuffer() {}
-
-}  // namespace content