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mojo/public/cpp/system/data_pipe.h

Index: mojo/public/cpp/system/data_pipe.h
diff --git a/mojo/public/cpp/system/data_pipe.h b/mojo/public/cpp/system/data_pipe.h
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-// Copyright 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.
-
-// This file provides a C++ wrapping around the Mojo C API for data pipes,
-// replacing the prefix of "Mojo" with a "mojo" namespace, and using more
-// strongly-typed representations of |MojoHandle|s.
-//
-// Please see "mojo/public/c/include/mojo/system/data_pipe.h" for complete
-// documentation of the API.
-
-#ifndef MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
-#define MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
-
-#include <assert.h>
-#include <mojo/system/data_pipe.h>
-
-#include "mojo/public/cpp/system/handle.h"
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojo {
-
-// A strongly-typed representation of a |MojoHandle| to the producer end of a
-// data pipe.
-class DataPipeProducerHandle : public Handle {
- public:
-  DataPipeProducerHandle() {}
-  explicit DataPipeProducerHandle(MojoHandle value) : Handle(value) {}
-
-  // Copying and assignment allowed.
-};
-
-static_assert(sizeof(DataPipeProducerHandle) == sizeof(Handle),
-              "Bad size for C++ DataPipeProducerHandle");
-
-typedef ScopedHandleBase<DataPipeProducerHandle> ScopedDataPipeProducerHandle;
-static_assert(sizeof(ScopedDataPipeProducerHandle) ==
-                  sizeof(DataPipeProducerHandle),
-              "Bad size for C++ ScopedDataPipeProducerHandle");
-
-// A strongly-typed representation of a |MojoHandle| to the consumer end of a
-// data pipe.
-class DataPipeConsumerHandle : public Handle {
- public:
-  DataPipeConsumerHandle() {}
-  explicit DataPipeConsumerHandle(MojoHandle value) : Handle(value) {}
-
-  // Copying and assignment allowed.
-};
-
-static_assert(sizeof(DataPipeConsumerHandle) == sizeof(Handle),
-              "Bad size for C++ DataPipeConsumerHandle");
-
-typedef ScopedHandleBase<DataPipeConsumerHandle> ScopedDataPipeConsumerHandle;
-static_assert(sizeof(ScopedDataPipeConsumerHandle) ==
-                  sizeof(DataPipeConsumerHandle),
-              "Bad size for C++ ScopedDataPipeConsumerHandle");
-
-// Creates a new data pipe. See |MojoCreateDataPipe()| for complete
-// documentation.
-inline MojoResult CreateDataPipe(
-    const MojoCreateDataPipeOptions* options,
-    ScopedDataPipeProducerHandle* data_pipe_producer,
-    ScopedDataPipeConsumerHandle* data_pipe_consumer) {
-  assert(data_pipe_producer);
-  assert(data_pipe_consumer);
-  DataPipeProducerHandle producer_handle;
-  DataPipeConsumerHandle consumer_handle;
-  MojoResult rv = MojoCreateDataPipe(options,
-                                     producer_handle.mutable_value(),
-                                     consumer_handle.mutable_value());
-  // Reset even on failure (reduces the chances that a "stale"/incorrect handle
-  // will be used).
-  data_pipe_producer->reset(producer_handle);
-  data_pipe_consumer->reset(consumer_handle);
-  return rv;
-}
-
-// Writes to a data pipe. See |MojoWriteData| for complete documentation.
-inline MojoResult WriteDataRaw(DataPipeProducerHandle data_pipe_producer,
-                               const void* elements,
-                               uint32_t* num_bytes,
-                               MojoWriteDataFlags flags) {
-  return MojoWriteData(data_pipe_producer.value(), elements, num_bytes, flags);
-}
-
-// Begins a two-phase write to a data pipe. See |MojoBeginWriteData()| for
-// complete documentation.
-inline MojoResult BeginWriteDataRaw(DataPipeProducerHandle data_pipe_producer,
-                                    void** buffer,
-                                    uint32_t* buffer_num_bytes,
-                                    MojoWriteDataFlags flags) {
-  return MojoBeginWriteData(
-      data_pipe_producer.value(), buffer, buffer_num_bytes, flags);
-}
-
-// Completes a two-phase write to a data pipe. See |MojoEndWriteData()| for
-// complete documentation.
-inline MojoResult EndWriteDataRaw(DataPipeProducerHandle data_pipe_producer,
-                                  uint32_t num_bytes_written) {
-  return MojoEndWriteData(data_pipe_producer.value(), num_bytes_written);
-}
-
-// Sets data pipe consumer options to their defaults. See
-// |MojoGetDataPipeConsumerOptions()| for complete documentation.
-inline MojoResult SetDataPipeConsumerOptionsToDefault(
-    DataPipeConsumerHandle data_pipe_consumer) {
-  return MojoSetDataPipeConsumerOptions(data_pipe_consumer.value(), nullptr);
-}
-
-// Sets data pipe consumer options (in an "unwrapped" format). See
-// |MojoGetDataPipeConsumerOptions()| for complete documentation.
-inline MojoResult SetDataPipeConsumerOptions(
-    DataPipeConsumerHandle data_pipe_consumer,
-    uint32_t read_threshold_num_bytes) {
-  MojoDataPipeConsumerOptions options = {
-      static_cast<uint32_t>(sizeof(MojoDataPipeConsumerOptions)),
-      read_threshold_num_bytes};
-  return MojoSetDataPipeConsumerOptions(data_pipe_consumer.value(), &options);
-}
-
-// Gets data pipe consumer options (in an "unwrapped" format). See
-// |MojoGetDataPipeConsumerOptions()| for complete documentation.
-inline MojoResult GetDataPipeConsumerOptions(
-    DataPipeConsumerHandle data_pipe_consumer,
-    uint32_t* read_threshold_num_bytes) {
-  MojoDataPipeConsumerOptions options = {};
-  MojoResult rv =
-      MojoGetDataPipeConsumerOptions(data_pipe_consumer.value(), &options,
-                                     static_cast<uint32_t>(sizeof(options)));
-  if (rv == MOJO_RESULT_OK) {
-    // No need to check |struct_size|, since all versions of the struct has this
-    // field.
-    *read_threshold_num_bytes = options.read_threshold_num_bytes;
-  }
-  return rv;
-}
-
-// Reads from a data pipe. See |MojoReadData()| for complete documentation.
-inline MojoResult ReadDataRaw(DataPipeConsumerHandle data_pipe_consumer,
-                              void* elements,
-                              uint32_t* num_bytes,
-                              MojoReadDataFlags flags) {
-  return MojoReadData(data_pipe_consumer.value(), elements, num_bytes, flags);
-}
-
-// Begins a two-phase read from a data pipe. See |MojoBeginReadData()| for
-// complete documentation.
-inline MojoResult BeginReadDataRaw(DataPipeConsumerHandle data_pipe_consumer,
-                                   const void** buffer,
-                                   uint32_t* buffer_num_bytes,
-                                   MojoReadDataFlags flags) {
-  return MojoBeginReadData(
-      data_pipe_consumer.value(), buffer, buffer_num_bytes, flags);
-}
-
-// Completes a two-phase read from a data pipe. See |MojoEndReadData()| for
-// complete documentation.
-inline MojoResult EndReadDataRaw(DataPipeConsumerHandle data_pipe_consumer,
-                                 uint32_t num_bytes_read) {
-  return MojoEndReadData(data_pipe_consumer.value(), num_bytes_read);
-}
-
-// A wrapper class that automatically creates a data pipe and owns both handles.
-// TODO(vtl): Make an even more friendly version? (Maybe templatized for a
-// particular type instead of some "element"? Maybe functions that take
-// vectors?)
-class DataPipe {
- public:
-  DataPipe();
-  explicit DataPipe(const MojoCreateDataPipeOptions& options);
-  ~DataPipe();
-
-  ScopedDataPipeProducerHandle producer_handle;
-  ScopedDataPipeConsumerHandle consumer_handle;
-};
-
-inline DataPipe::DataPipe() {
-  MojoResult result =
-      CreateDataPipe(nullptr, &producer_handle, &consumer_handle);
-  MOJO_ALLOW_UNUSED_LOCAL(result);
-  assert(result == MOJO_RESULT_OK);
-}
-
-inline DataPipe::DataPipe(const MojoCreateDataPipeOptions& options) {
-  MojoResult result =
-      CreateDataPipe(&options, &producer_handle, &consumer_handle);
-  MOJO_ALLOW_UNUSED_LOCAL(result);
-  assert(result == MOJO_RESULT_OK);
-}
-
-inline DataPipe::~DataPipe() {
-}
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_