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-rw-r--r--mojo/public/cpp/system/data_pipe.h141
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diff --git a/mojo/public/cpp/system/data_pipe.h b/mojo/public/cpp/system/data_pipe.h
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--- a/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.
-
-#ifndef MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
-#define MOJO_PUBLIC_CPP_SYSTEM_DATA_PIPE_H_
-
-#include <assert.h>
-
-#include "mojo/public/c/system/data_pipe.h"
-#include "mojo/public/cpp/system/handle.h"
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojo {
-
-// DataPipeProducerHandle and DataPipeConsumerHandle ---------------------------
-
-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");
-
-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");
-
-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;
-}
-
-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);
-}
-
-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);
-}
-
-inline MojoResult EndWriteDataRaw(DataPipeProducerHandle data_pipe_producer,
- uint32_t num_bytes_written) {
- return MojoEndWriteData(data_pipe_producer.value(), num_bytes_written);
-}
-
-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);
-}
-
-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);
-}
-
-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_