| // Copyright 2026 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef PARTITION_ALLOC_EXTENT_IN_BOUNDS_H_ |
| #define PARTITION_ALLOC_EXTENT_IN_BOUNDS_H_ |
| |
| // This is the same as `bounds_checks.h`, but kept in a separate header |
| // to avoid bloating consumers of the widely included `span.h`. |
| |
| #include <cstddef> |
| |
| #include "partition_alloc/bounds_checks.h" |
| #include "partition_alloc/partition_alloc_base/numerics/checked_math.h" |
| #include "partition_alloc/partition_alloc_base/numerics/safe_conversions.h" |
| |
| namespace partition_alloc { |
| |
| // Like `IsExtentOutOfBounds()`, but without the negative logic. |
| // |
| // Has the same caveats as `IsExtentOutOfBounds()` (but inverted). |
| // |
| // Given a `T* elems` and a max `index`, call |
| // ``` |
| // CHECK(IsExtentInBounds(elems, index)); |
| // ``` |
| template <typename T> |
| bool IsExtentInBounds(const T* ptr, |
| internal::base::StrictNumeric<size_t> index) { |
| internal::base::CheckedNumeric<size_t> size_bytes = index; |
| size_bytes *= sizeof(T); |
| return !IsExtentOutOfBounds(ptr, size_bytes.ValueOrDie(), sizeof(T)); |
| } |
| |
| } // namespace partition_alloc |
| |
| #endif // PARTITION_ALLOC_EXTENT_IN_BOUNDS_H_ |
