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