| // Copyright 2020 The Fuchsia 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 <zircon/assert.h> |
| |
| #include <cstring> |
| |
| #include <safemath/checked_math.h> |
| #include <storage/buffer/block_buffer.h> |
| |
| namespace storage { |
| |
| zx_status_t BlockBuffer::Zero(size_t index, size_t count) { |
| auto end_index_or = safemath::CheckAdd(index, count); |
| auto length_or = safemath::CheckMul(count, safemath::checked_cast<size_t>(BlockSize())); |
| if (!length_or.IsValid() || !end_index_or.IsValid() || end_index_or.ValueOrDie() > capacity()) { |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| std::memset(Data(index), 0, length_or.ValueOrDie()); |
| return ZX_OK; |
| } |
| |
| } // namespace storage |
