/* * 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 // 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 T checkLE(uint64_t value, T max) { SkASSERT(static_cast(max) >= 0); if (value > static_cast(max)) { fOK = false; value = 0; } return static_cast(value); } int checkGE(int value, int min) { if (value < min) { fOK = false; value = min; } return value; } private: bool fOK = true; }; #endif