| // 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 |