| // 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_kvs/in_memory_fake_flash.h" |
| |
| #include "pw_log/log.h" |
| |
| namespace pw::kvs { |
| |
| Status InMemoryFakeFlash::Erase(Address address, size_t num_sectors) { |
| if (address % sector_size_bytes() != 0) { |
| PW_LOG_ERROR( |
| "Attempted to erase sector at non-sector aligned boundary; address %zx", |
| size_t(address)); |
| return Status::INVALID_ARGUMENT; |
| } |
| const size_t sector_id = address / sector_size_bytes(); |
| if (address / sector_size_bytes() + num_sectors > sector_count()) { |
| PW_LOG_ERROR( |
| "Tried to erase a sector at an address past flash end; " |
| "address: %zx, sector implied: %zu", |
| size_t(address), |
| sector_id); |
| return Status::OUT_OF_RANGE; |
| } |
| |
| std::memset( |
| &buffer_[address], int(kErasedValue), sector_size_bytes() * num_sectors); |
| return Status::OK; |
| } |
| |
| StatusWithSize InMemoryFakeFlash::Read(Address address, |
| span<std::byte> output) { |
| if (address + output.size() >= sector_count() * size_bytes()) { |
| return StatusWithSize(Status::OUT_OF_RANGE); |
| } |
| std::memcpy(output.data(), &buffer_[address], output.size()); |
| return StatusWithSize(output.size()); |
| } |
| |
| StatusWithSize InMemoryFakeFlash::Write(Address address, |
| span<const std::byte> data) { |
| if (address % alignment_bytes() != 0 || |
| data.size() % alignment_bytes() != 0) { |
| PW_LOG_ERROR("Unaligned write; address %zx, size %zu B, alignment %zu", |
| size_t(address), |
| data.size(), |
| alignment_bytes()); |
| return StatusWithSize(Status::INVALID_ARGUMENT); |
| } |
| |
| if (data.size() > sector_size_bytes() - (address % sector_size_bytes())) { |
| PW_LOG_ERROR("Write crosses sector boundary; address %zx, size %zu B", |
| size_t(address), |
| data.size()); |
| return StatusWithSize(Status::INVALID_ARGUMENT); |
| } |
| |
| if (address + data.size() > sector_count() * sector_size_bytes()) { |
| PW_LOG_ERROR( |
| "Write beyond end of memory; address %zx, size %zu B, max address %zx", |
| size_t(address), |
| data.size(), |
| sector_count() * sector_size_bytes()); |
| return StatusWithSize(Status::OUT_OF_RANGE); |
| } |
| |
| // Check in erased state |
| for (unsigned i = 0; i < data.size(); i++) { |
| if (buffer_[address + i] != kErasedValue) { |
| PW_LOG_ERROR("Writing to previously written address: %zx", |
| size_t(address)); |
| return StatusWithSize(Status::UNKNOWN); |
| } |
| } |
| std::memcpy(&buffer_[address], data.data(), data.size()); |
| return StatusWithSize(data.size()); |
| } |
| } // namespace pw::kvs |