Source release 17.1.1

oemcrypto/odk/src/odk_overflow.c

@@ -0,0 +1,46 @@
+// Copyright 2019 Google LLC. All rights reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine
+// License Agreement.
+
+#include <stddef.h>
+#include <stdint.h>
+
+int odk_sub_overflow_u64(uint64_t a, uint64_t b, uint64_t* c) {
+  if (a >= b) {
+    if (c) {
+      *c = a - b;
+    }
+    return 0;
+  }
+  return 1;
+}
+
+int odk_add_overflow_u64(uint64_t a, uint64_t b, uint64_t* c) {
+  if (UINT64_MAX - a >= b) {
+    if (c) {
+      *c = a + b;
+    }
+    return 0;
+  }
+  return 1;
+}
+
+int odk_add_overflow_ux(size_t a, size_t b, size_t* c) {
+  if (SIZE_MAX - a >= b) {
+    if (c) {
+      *c = a + b;
+    }
+    return 0;
+  }
+  return 1;
+}
+
+int odk_mul_overflow_ux(size_t a, size_t b, size_t* c) {
+  if (b > 0 && a > SIZE_MAX / b) {
+    return 1;
+  }
+  if (c) {
+    *c = a * b;
+  }
+  return 0;
+}