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/*
* 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
// 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
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