1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkSafeRange_DEFINED 9 #define SkSafeRange_DEFINED 10 11 // SkSafeRange always check that a series of operations are in-range. 12 // This check is sticky, so that if any one operation fails, the object will remember that and 13 // return false from ok(). 14 15 class SkSafeRange { 16 public: 17 operator bool() const { return fOK; } 18 19 bool ok() const { return fOK; } 20 21 // checks 0 <= value <= max. 22 // On success, returns value 23 // On failure, returns 0 and sets ok() to false 24 template <typename T> T checkLE(uint64_t value, T max) { 25 SkASSERT(static_cast<int64_t>(max) >= 0); 26 if (value > static_cast<uint64_t>(max)) { 27 fOK = false; 28 value = 0; 29 } 30 return static_cast<T>(value); 31 } 32 33 int checkGE(int value, int min) { 34 if (value < min) { 35 fOK = false; 36 value = min; 37 } 38 return value; 39 } 40 41 private: 42 bool fOK = true; 43 }; 44 45 #endif 46
