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// Copyright 2015 The Chromium OS 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 <brillo/streams/input_stream_set.h>
#include <utility>
#include <base/bind.h>
#include <brillo/message_loops/message_loop.h>
#include <brillo/streams/stream_errors.h>
#include <brillo/streams/stream_utils.h>
namespace brillo {
InputStreamSet::InputStreamSet(
std::vector<Stream*> source_streams,
std::vector<StreamPtr> owned_source_streams,
uint64_t initial_stream_size)
: source_streams_{std::move(source_streams)},
owned_source_streams_{std::move(owned_source_streams)},
initial_stream_size_{initial_stream_size} {}
StreamPtr InputStreamSet::Create(std::vector<Stream*> source_streams,
std::vector<StreamPtr> owned_source_streams,
ErrorPtr* error) {
StreamPtr stream;
if (source_streams.empty()) {
Error::AddTo(error, FROM_HERE, errors::stream::kDomain,
errors::stream::kInvalidParameter,
"Source stream list is empty");
return stream;
}
// Make sure we have only readable streams.
for (Stream* src_stream : source_streams) {
if (!src_stream->CanRead()) {
Error::AddTo(error, FROM_HERE, errors::stream::kDomain,
errors::stream::kInvalidParameter,
"The stream list must contain only readable streams");
return stream;
}
}
// We are using remaining size here because the multiplexed stream is not
// seekable and the bytes already read are essentially "lost" as far as this
// stream is concerned.
uint64_t initial_stream_size = 0;
for (const Stream* stream : source_streams)
initial_stream_size += stream->GetRemainingSize();
stream.reset(new InputStreamSet{std::move(source_streams),
std::move(owned_source_streams),
initial_stream_size});
return stream;
}
StreamPtr InputStreamSet::Create(std::vector<Stream*> source_streams,
ErrorPtr* error) {
return Create(std::move(source_streams), {}, error);
}
StreamPtr InputStreamSet::Create(std::vector<StreamPtr> owned_source_streams,
ErrorPtr* error) {
std::vector<Stream*> source_streams;
source_streams.reserve(owned_source_streams.size());
for (const StreamPtr& stream : owned_source_streams)
source_streams.push_back(stream.get());
return Create(std::move(source_streams), std::move(owned_source_streams),
error);
}
bool InputStreamSet::IsOpen() const {
return !closed_;
}
bool InputStreamSet::CanGetSize() const {
bool can_get_size = IsOpen();
for (const Stream* stream : source_streams_) {
if (!stream->CanGetSize()) {
can_get_size = false;
break;
}
}
return can_get_size;
}
uint64_t InputStreamSet::GetSize() const {
return initial_stream_size_;
}
bool InputStreamSet::SetSizeBlocking(uint64_t /* size */, ErrorPtr* error) {
return stream_utils::ErrorOperationNotSupported(FROM_HERE, error);
}
uint64_t InputStreamSet::GetRemainingSize() const {
uint64_t size = 0;
for (const Stream* stream : source_streams_)
size += stream->GetRemainingSize();
return size;
}
bool InputStreamSet::Seek(int64_t /* offset */,
Whence /* whence */,
uint64_t* /* new_position */,
ErrorPtr* error) {
return stream_utils::ErrorOperationNotSupported(FROM_HERE, error);
}
bool InputStreamSet::ReadNonBlocking(void* buffer,
size_t size_to_read,
size_t* size_read,
bool* end_of_stream,
ErrorPtr* error) {
if (!IsOpen())
return stream_utils::ErrorStreamClosed(FROM_HERE, error);
while (!source_streams_.empty()) {
Stream* stream = source_streams_.front();
bool eos = false;
if (!stream->ReadNonBlocking(buffer, size_to_read, size_read, &eos, error))
return false;
if (*size_read > 0 || !eos) {
if (end_of_stream)
*end_of_stream = false;
return true;
}
source_streams_.erase(source_streams_.begin());
}
*size_read = 0;
if (end_of_stream)
*end_of_stream = true;
return true;
}
bool InputStreamSet::WriteNonBlocking(const void* /* buffer */,
size_t /* size_to_write */,
size_t* /* size_written */,
ErrorPtr* error) {
return stream_utils::ErrorOperationNotSupported(FROM_HERE, error);
}
bool InputStreamSet::CloseBlocking(ErrorPtr* error) {
bool success = true;
// We want to close only the owned streams.
for (StreamPtr& stream_ptr : owned_source_streams_) {
if (!stream_ptr->CloseBlocking(error))
success = false; // Keep going for other streams...
}
owned_source_streams_.clear();
source_streams_.clear();
initial_stream_size_ = 0;
closed_ = true;
return success;
}
bool InputStreamSet::WaitForData(
AccessMode mode,
const base::Callback<void(AccessMode)>& callback,
ErrorPtr* error) {
if (!IsOpen())
return stream_utils::ErrorStreamClosed(FROM_HERE, error);
if (stream_utils::IsWriteAccessMode(mode))
return stream_utils::ErrorOperationNotSupported(FROM_HERE, error);
if (!source_streams_.empty()) {
Stream* stream = source_streams_.front();
return stream->WaitForData(mode, callback, error);
}
MessageLoop::current()->PostTask(FROM_HERE, base::BindOnce(callback, mode));
return true;
}
bool InputStreamSet::WaitForDataBlocking(AccessMode in_mode,
base::TimeDelta timeout,
AccessMode* out_mode,
ErrorPtr* error) {
if (!IsOpen())
return stream_utils::ErrorStreamClosed(FROM_HERE, error);
if (stream_utils::IsWriteAccessMode(in_mode))
return stream_utils::ErrorOperationNotSupported(FROM_HERE, error);
if (!source_streams_.empty()) {
Stream* stream = source_streams_.front();
return stream->WaitForDataBlocking(in_mode, timeout, out_mode, error);
}
if (out_mode)
*out_mode = in_mode;
return true;
}
void InputStreamSet::CancelPendingAsyncOperations() {
if (IsOpen() && !source_streams_.empty()) {
Stream* stream = source_streams_.front();
stream->CancelPendingAsyncOperations();
}
Stream::CancelPendingAsyncOperations();
}
} // namespace brillo
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