| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkSafeRange_DEFINED |
| #define SkSafeRange_DEFINED |
| |
| #include "include/core/SkTypes.h" |
| |
| #include <cstdint> |
| |
| // SkSafeRange always check that a series of operations are in-range. |
| // This check is sticky, so that if any one operation fails, the object will remember that and |
| // return false from ok(). |
| |
| class SkSafeRange { |
| public: |
| operator bool() const { return fOK; } |
| |
| bool ok() const { return fOK; } |
| |
| // checks 0 <= value <= max. |
| // On success, returns value |
| // On failure, returns 0 and sets ok() to false |
| template <typename T> T checkLE(uint64_t value, T max) { |
| SkASSERT(static_cast<int64_t>(max) >= 0); |
| if (value > static_cast<uint64_t>(max)) { |
| fOK = false; |
| value = 0; |
| } |
| return static_cast<T>(value); |
| } |
| |
| int checkGE(int value, int min) { |
| if (value < min) { |
| fOK = false; |
| value = min; |
| } |
| return value; |
| } |
| |
| private: |
| bool fOK = true; |
| }; |
| |
| #endif |