Lesson 35 - Get Compute Auth Token Working

Plugins/GameLiftPlugin/Source/AWSSDK/Include/aws/common/zero.inl

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+#ifndef AWS_COMMON_ZERO_INL
+#define AWS_COMMON_ZERO_INL
+
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include <aws/common/stdbool.h>
+#include <aws/common/stdint.h>
+#include <aws/common/zero.h>
+#include <string.h>
+
+AWS_EXTERN_C_BEGIN
+/**
+ * Returns whether each byte is zero.
+ */
+AWS_STATIC_IMPL
+bool aws_is_mem_zeroed(const void *buf, size_t bufsize) {
+    /* Optimization idea: vectorized instructions to check more than 64 bits at a time. */
+
+    /* Check 64 bits at a time */
+    const uint64_t *buf_u64 = (const uint64_t *)buf;
+    const size_t num_u64_checks = bufsize / 8;
+    size_t i;
+    for (i = 0; i < num_u64_checks; ++i) {
+        if (buf_u64[i]) {
+            return false;
+        }
+    }
+
+    /* Update buf to where u64 checks left off */
+    buf = buf_u64 + num_u64_checks;
+    bufsize = bufsize % 8;
+
+    /* Check 8 bits at a time */
+    const uint8_t *buf_u8 = (const uint8_t *)buf;
+    for (i = 0; i < bufsize; ++i) {
+        if (buf_u8[i]) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+AWS_EXTERN_C_END
+
+#endif /* AWS_COMMON_ZERO_INL */