49 lines
836 B
C
49 lines
836 B
C
// Copyright 2019 Google LLC. This file and proprietary
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// source code may only be used and distributed under the Widevine
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// License Agreement.
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#include "odk_overflow.h"
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#include <stddef.h>
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#include <stdint.h>
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int odk_sub_overflow_u64(uint64_t a, uint64_t b, uint64_t* c) {
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if (a >= b) {
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if (c) {
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*c = a - b;
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}
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return 0;
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}
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return 1;
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}
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int odk_add_overflow_u64(uint64_t a, uint64_t b, uint64_t* c) {
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if (UINT64_MAX - a >= b) {
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if (c) {
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*c = a + b;
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}
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return 0;
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}
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return 1;
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}
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int odk_add_overflow_ux(size_t a, size_t b, size_t* c) {
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if (SIZE_MAX - a >= b) {
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if (c) {
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*c = a + b;
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}
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return 0;
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}
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return 1;
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}
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int odk_mul_overflow_ux(size_t a, size_t b, size_t* c) {
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if (b > 0 && a > SIZE_MAX / b) {
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return 1;
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}
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if (c) {
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*c = a * b;
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}
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return 0;
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}
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