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// Copyright 2021 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_stream/std_file_stream.h"
namespace pw::stream {
namespace {
std::ios::seekdir WhenceToSeekDir(Stream::Whence whence) {
switch (whence) {
case Stream::Whence::kBeginning:
return std::ios::beg;
case Stream::Whence::kCurrent:
return std::ios::cur;
case Stream::Whence::kEnd:
return std::ios::end;
}
}
} // namespace
StatusWithSize StdFileReader::DoRead(ByteSpan dest) {
stream_.peek(); // Peek to set EOF if at the end of the file.
if (stream_.eof()) {
return StatusWithSize::OutOfRange();
}
stream_.read(reinterpret_cast<char*>(dest.data()), dest.size());
if (stream_.bad()) {
return StatusWithSize::Unknown();
}
return StatusWithSize(stream_.gcount());
}
Status StdFileReader::DoSeek(ptrdiff_t offset, Whence origin) {
if (!stream_.seekg(offset, WhenceToSeekDir(origin))) {
return Status::Unknown();
}
return OkStatus();
}
Status StdFileWriter::DoWrite(ConstByteSpan data) {
if (stream_.eof()) {
return Status::OutOfRange();
}
if (stream_.write(reinterpret_cast<const char*>(data.data()), data.size())) {
return OkStatus();
}
return Status::Unknown();
}
Status StdFileWriter::DoSeek(ptrdiff_t offset, Whence origin) {
if (!stream_.seekp(offset, WhenceToSeekDir(origin))) {
return Status::Unknown();
}
return OkStatus();
}
} // namespace pw::stream
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