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// Copyright 2020 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/memory_stream.h"
#include <cstddef>
#include <cstring>
#include "pw_status/status_with_size.h"
namespace pw::stream {
Status MemoryWriter::DoWrite(ConstByteSpan data) {
if (ConservativeWriteLimit() == 0) {
return Status::OutOfRange();
}
if (ConservativeWriteLimit() < data.size_bytes()) {
return Status::ResourceExhausted();
}
size_t bytes_to_write = data.size_bytes();
std::memmove(dest_.data() + position_, data.data(), bytes_to_write);
position_ += bytes_to_write;
return OkStatus();
}
StatusWithSize MemoryReader::DoRead(ByteSpan dest) {
if (source_.size_bytes() == position_) {
return StatusWithSize::OutOfRange();
}
size_t bytes_to_read =
std::min(dest.size_bytes(), source_.size_bytes() - position_);
std::memcpy(dest.data(), source_.data() + position_, bytes_to_read);
position_ += bytes_to_read;
return StatusWithSize(bytes_to_read);
}
} // namespace pw::stream