Lesson 35 - Get Compute Auth Token Working

Plugins/GameLiftPlugin/Source/AWSSDK/Include/aws/common/math.fallback.inl

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+#ifndef AWS_COMMON_MATH_FALLBACK_INL
+#define AWS_COMMON_MATH_FALLBACK_INL
+
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+/*
+ * This header is already included, but include it again to make editor
+ * highlighting happier.
+ */
+#include <aws/common/common.h>
+#include <aws/common/math.h>
+
+AWS_EXTERN_C_BEGIN
+/**
+ * Multiplies a * b. If the result overflows, returns 2^64 - 1.
+ */
+AWS_STATIC_IMPL uint64_t aws_mul_u64_saturating(uint64_t a, uint64_t b) {
+    if (a > 0 && b > 0 && a > (UINT64_MAX / b))
+        return UINT64_MAX;
+    return a * b;
+}
+
+/**
+ * If a * b overflows, returns AWS_OP_ERR; otherwise multiplies
+ * a * b, returns the result in *r, and returns AWS_OP_SUCCESS.
+ */
+AWS_STATIC_IMPL int aws_mul_u64_checked(uint64_t a, uint64_t b, uint64_t *r) {
+    if (a > 0 && b > 0 && a > (UINT64_MAX / b))
+        return aws_raise_error(AWS_ERROR_OVERFLOW_DETECTED);
+    *r = a * b;
+    return AWS_OP_SUCCESS;
+}
+
+/**
+ * Multiplies a * b. If the result overflows, returns 2^32 - 1.
+ */
+AWS_STATIC_IMPL uint32_t aws_mul_u32_saturating(uint32_t a, uint32_t b) {
+    if (a > 0 && b > 0 && a > (UINT32_MAX / b))
+        return UINT32_MAX;
+    return a * b;
+}
+
+/**
+ * If a * b overflows, returns AWS_OP_ERR; otherwise multiplies
+ * a * b, returns the result in *r, and returns AWS_OP_SUCCESS.
+ */
+AWS_STATIC_IMPL int aws_mul_u32_checked(uint32_t a, uint32_t b, uint32_t *r) {
+    if (a > 0 && b > 0 && a > (UINT32_MAX / b))
+        return aws_raise_error(AWS_ERROR_OVERFLOW_DETECTED);
+    *r = a * b;
+    return AWS_OP_SUCCESS;
+}
+
+/**
+ * Adds a + b.  If the result overflows returns 2^64 - 1.
+ */
+AWS_STATIC_IMPL uint64_t aws_add_u64_saturating(uint64_t a, uint64_t b) {
+    if ((b > 0) && (a > (UINT64_MAX - b)))
+        return UINT64_MAX;
+    return a + b;
+}
+
+/**
+ * If a + b overflows, returns AWS_OP_ERR; otherwise adds
+ * a + b, returns the result in *r, and returns AWS_OP_SUCCESS.
+ */
+AWS_STATIC_IMPL int aws_add_u64_checked(uint64_t a, uint64_t b, uint64_t *r) {
+    if ((b > 0) && (a > (UINT64_MAX - b)))
+        return aws_raise_error(AWS_ERROR_OVERFLOW_DETECTED);
+    *r = a + b;
+    return AWS_OP_SUCCESS;
+}
+
+/**
+ * Adds a + b. If the result overflows returns 2^32 - 1.
+ */
+AWS_STATIC_IMPL uint32_t aws_add_u32_saturating(uint32_t a, uint32_t b) {
+    if ((b > 0) && (a > (UINT32_MAX - b)))
+        return UINT32_MAX;
+    return a + b;
+}
+
+/**
+ * If a + b overflows, returns AWS_OP_ERR; otherwise adds
+ * a + b, returns the result in *r, and returns AWS_OP_SUCCESS.
+ */
+AWS_STATIC_IMPL int aws_add_u32_checked(uint32_t a, uint32_t b, uint32_t *r) {
+    if ((b > 0) && (a > (UINT32_MAX - b)))
+        return aws_raise_error(AWS_ERROR_OVERFLOW_DETECTED);
+    *r = a + b;
+    return AWS_OP_SUCCESS;
+}
+
+/*
+ * These are pure C implementations of the count leading/trailing zeros calls
+ * They should not be necessary unless using a really esoteric compiler with
+ * no intrinsics for these functions whatsoever.
+ */
+#if !defined(__clang__) && !defined(__GNUC__)
+/**
+ * Search from the MSB to LSB, looking for a 1
+ */
+AWS_STATIC_IMPL size_t aws_clz_u32(uint32_t n) {
+    return aws_clz_i32((int32_t)n);
+}
+
+AWS_STATIC_IMPL size_t aws_clz_i32(int32_t n) {
+    size_t idx = 0;
+    if (n == 0) {
+        return sizeof(n) * 8;
+    }
+    /* sign bit is the first bit */
+    if (n < 0) {
+        return 0;
+    }
+    while (n >= 0) {
+        ++idx;
+        n <<= 1;
+    }
+    return idx;
+}
+
+AWS_STATIC_IMPL size_t aws_clz_u64(uint64_t n) {
+    return aws_clz_i64((int64_t)n);
+}
+
+AWS_STATIC_IMPL size_t aws_clz_i64(int64_t n) {
+    size_t idx = 0;
+    if (n == 0) {
+        return sizeof(n) * 8;
+    }
+    /* sign bit is the first bit */
+    if (n < 0) {
+        return 0;
+    }
+    while (n >= 0) {
+        ++idx;
+        n <<= 1;
+    }
+    return idx;
+}
+
+AWS_STATIC_IMPL size_t aws_clz_size(size_t n) {
+#    if SIZE_BITS == 64
+    return aws_clz_u64(n);
+#    else
+    return aws_clz_u32(n);
+#    endif
+}
+
+/**
+ * Search from the LSB to MSB, looking for a 1
+ */
+AWS_STATIC_IMPL size_t aws_ctz_u32(uint32_t n) {
+    return aws_ctz_i32((int32_t)n);
+}
+
+AWS_STATIC_IMPL size_t aws_ctz_i32(int32_t n) {
+    int32_t idx = 0;
+    const int32_t max_bits = (int32_t)(SIZE_BITS / sizeof(uint8_t));
+    if (n == 0) {
+        return sizeof(n) * 8;
+    }
+    while (idx < max_bits) {
+        if (n & (1 << idx)) {
+            break;
+        }
+        ++idx;
+    }
+    return (size_t)idx;
+}
+
+AWS_STATIC_IMPL size_t aws_ctz_u64(uint64_t n) {
+    return aws_ctz_i64((int64_t)n);
+}
+
+AWS_STATIC_IMPL size_t aws_ctz_i64(int64_t n) {
+    int64_t idx = 0;
+    const int64_t max_bits = (int64_t)(SIZE_BITS / sizeof(uint8_t));
+    if (n == 0) {
+        return sizeof(n) * 8;
+    }
+    while (idx < max_bits) {
+        if (n & (1ULL << idx)) {
+            break;
+        }
+        ++idx;
+    }
+    return (size_t)idx;
+}
+
+AWS_STATIC_IMPL size_t aws_ctz_size(size_t n) {
+#    if SIZE_BITS == 64
+    return aws_ctz_u64(n);
+#    else
+    return aws_ctz_u32(n);
+#    endif
+}
+
+#endif
+
+AWS_EXTERN_C_END
+
+#endif /*  AWS_COMMON_MATH_FALLBACK_INL */