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- /*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "src/core/SkSafeMath.h"
- #include "tests/Test.h"
- DEF_TEST(SafeMath, r) {
- size_t max = std::numeric_limits<size_t>::max();
- {
- size_t halfMax = max >> 1;
- size_t halfMaxPlus1 = halfMax + 1;
- SkSafeMath safe;
- REPORTER_ASSERT(r, safe.add(halfMax, halfMax) == 2 * halfMax);
- REPORTER_ASSERT(r, safe);
- REPORTER_ASSERT(r, safe.add(halfMax, halfMaxPlus1) == max);
- REPORTER_ASSERT(r, safe);
- REPORTER_ASSERT(r, safe.add(max, 1) == 0);
- REPORTER_ASSERT(r, !safe);
- }
- {
- SkSafeMath safe;
- (void) safe.add(max, max);
- REPORTER_ASSERT(r, !safe);
- }
- {
- size_t bits = (sizeof(size_t) * 8);
- size_t halfBits = bits / 2;
- size_t sqrtMax = max >> halfBits;
- size_t sqrtMaxPlus1 = sqrtMax + 1;
- SkSafeMath safe;
- REPORTER_ASSERT(r, safe.mul(sqrtMax, sqrtMax) == sqrtMax * sqrtMax);
- REPORTER_ASSERT(r, safe);
- REPORTER_ASSERT(r, safe.mul(sqrtMax, sqrtMaxPlus1) == sqrtMax << halfBits);
- REPORTER_ASSERT(r, safe);
- REPORTER_ASSERT(r, safe.mul(sqrtMaxPlus1, sqrtMaxPlus1) == 0);
- REPORTER_ASSERT(r, !safe);
- }
- {
- SkSafeMath safe;
- (void) safe.mul(max, max);
- REPORTER_ASSERT(r, !safe);
- }
- }
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