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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/memory_stream.h>
#include <limits>
#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 {
MemoryStream::MemoryStream(
std::unique_ptr<data_container::DataContainerInterface> container,
size_t stream_position)
: container_{std::move(container)}, stream_position_{stream_position} {}
StreamPtr MemoryStream::OpenRef(const void* buffer,
size_t size,
ErrorPtr* error) {
std::unique_ptr<data_container::ReadOnlyBuffer> container{
new data_container::ReadOnlyBuffer{buffer, size}};
return CreateEx(std::move(container), 0, error);
}
StreamPtr MemoryStream::OpenCopyOf(const void* buffer,
size_t size,
ErrorPtr* error) {
std::unique_ptr<data_container::ReadOnlyVectorCopy<uint8_t>> container{
new data_container::ReadOnlyVectorCopy<uint8_t>{
reinterpret_cast<const uint8_t*>(buffer), size}};
return CreateEx(std::move(container), 0, error);
}
StreamPtr MemoryStream::OpenRef(const std::string& buffer, ErrorPtr* error) {
std::unique_ptr<data_container::ReadOnlyStringRef> container{
new data_container::ReadOnlyStringRef{buffer}};
return CreateEx(std::move(container), 0, error);
}
StreamPtr MemoryStream::OpenCopyOf(std::string buffer, ErrorPtr* error) {
std::unique_ptr<data_container::ReadOnlyStringCopy> container{
new data_container::ReadOnlyStringCopy{std::move(buffer)}};
return CreateEx(std::move(container), 0, error);
}
StreamPtr MemoryStream::OpenRef(const char* buffer, ErrorPtr* error) {
return OpenRef(buffer, std::strlen(buffer), error);
}
StreamPtr MemoryStream::OpenCopyOf(const char* buffer, ErrorPtr* error) {
return OpenCopyOf(buffer, std::strlen(buffer), error);
}
StreamPtr MemoryStream::Create(size_t reserve_size, ErrorPtr* error) {
std::unique_ptr<data_container::ByteBuffer> container{
new data_container::ByteBuffer{reserve_size}};
return CreateEx(std::move(container), 0, error);
}
StreamPtr MemoryStream::CreateRef(std::string* buffer, ErrorPtr* error) {
std::unique_ptr<data_container::StringPtr> container{
new data_container::StringPtr{buffer}};
return CreateEx(std::move(container), 0, error);
}
StreamPtr MemoryStream::CreateRefForAppend(std::string* buffer,
ErrorPtr* error) {
std::unique_ptr<data_container::StringPtr> container{
new data_container::StringPtr{buffer}};
return CreateEx(std::move(container), buffer->size(), error);
}
StreamPtr MemoryStream::CreateEx(
std::unique_ptr<data_container::DataContainerInterface> container,
size_t stream_position,
ErrorPtr* error) {
ignore_result(error); // Unused.
return StreamPtr{new MemoryStream(std::move(container), stream_position)};
}
bool MemoryStream::IsOpen() const { return container_ != nullptr; }
bool MemoryStream::CanRead() const { return IsOpen(); }
bool MemoryStream::CanWrite() const {
return IsOpen() && !container_->IsReadOnly();
}
bool MemoryStream::CanSeek() const { return IsOpen(); }
bool MemoryStream::CanGetSize() const { return IsOpen(); }
uint64_t MemoryStream::GetSize() const {
return IsOpen() ? container_->GetSize() : 0;
}
bool MemoryStream::SetSizeBlocking(uint64_t size, ErrorPtr* error) {
if (!CheckContainer(error))
return false;
return container_->Resize(size, error);
}
uint64_t MemoryStream::GetRemainingSize() const {
uint64_t pos = GetPosition();
uint64_t size = GetSize();
return (pos < size) ? size - pos : 0;
}
uint64_t MemoryStream::GetPosition() const {
return IsOpen() ? stream_position_ : 0;
}
bool MemoryStream::Seek(int64_t offset,
Whence whence,
uint64_t* new_position,
ErrorPtr* error) {
uint64_t pos = 0;
if (!CheckContainer(error) ||
!stream_utils::CalculateStreamPosition(FROM_HERE, offset, whence,
stream_position_, GetSize(), &pos,
error)) {
return false;
}
if (pos > static_cast<uint64_t>(std::numeric_limits<size_t>::max())) {
// This can only be the case on 32 bit systems.
brillo::Error::AddTo(error, FROM_HERE, errors::stream::kDomain,
errors::stream::kInvalidParameter,
"Stream pointer position is outside allowed limits");
return false;
}
stream_position_ = static_cast<size_t>(pos);
if (new_position)
*new_position = stream_position_;
return true;
}
bool MemoryStream::ReadNonBlocking(void* buffer,
size_t size_to_read,
size_t* size_read,
bool* end_of_stream,
ErrorPtr* error) {
if (!CheckContainer(error))
return false;
size_t read = 0;
if (!container_->Read(buffer, size_to_read, stream_position_, &read, error))
return false;
stream_position_ += read;
*size_read = read;
if (end_of_stream)
*end_of_stream = (read == 0) && (size_to_read != 0);
return true;
}
bool MemoryStream::WriteNonBlocking(const void* buffer,
size_t size_to_write,
size_t* size_written,
ErrorPtr* error) {
if (!CheckContainer(error))
return false;
if (!container_->Write(buffer, size_to_write, stream_position_, size_written,
error)) {
return false;
}
stream_position_ += *size_written;
return true;
}
bool MemoryStream::FlushBlocking(ErrorPtr* error) {
return CheckContainer(error);
}
bool MemoryStream::CloseBlocking(ErrorPtr* error) {
ignore_result(error); // Unused.
container_.reset();
return true;
}
bool MemoryStream::CheckContainer(ErrorPtr* error) const {
return container_ || stream_utils::ErrorStreamClosed(FROM_HERE, error);
}
bool MemoryStream::WaitForData(AccessMode mode,
const base::Callback<void(AccessMode)>& callback,
ErrorPtr* /* error */) {
MessageLoop::current()->PostTask(FROM_HERE, base::Bind(callback, mode));
return true;
}
bool MemoryStream::WaitForDataBlocking(AccessMode in_mode,
base::TimeDelta /* timeout */,
AccessMode* out_mode,
ErrorPtr* /* error */) {
if (out_mode)
*out_mode = in_mode;
return true;
}
} // namespace brillo
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