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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "HidUtils.h"
#include <gtest/gtest.h>
using HidUtil::copyBits;
TEST(CopyBitsTest, CopyBits) {
const struct {
uint32_t src;
uint32_t dst;
int src_bit_offset;
int dst_bit_offset;
int bit_count;
uint32_t expected_dst;
} kTestVectorList[] = {
{ 0x00000005, 0x00000000, 0, 0, 8, 0x00000005 },
{ 0x00000005, 0x00000000, 0, 4, 8, 0x00000050 },
{ 0x0000000C, 0x00000020, 0, 4, 8, 0x000000C0 },
{ 0x00000005, 0x0000F02F, 0, 4, 8, 0x0000F05F },
{ 0x12345678, 0x87654321, 5, 11, 17, 0x8D159B21 },
{ 0x12345678, 0x87654321, 11, 5, 17, 0x8748D141 },
};
for (auto test_vector : kTestVectorList) {
uint32_t dst = test_vector.dst;
copyBits(&(test_vector.src), &dst, sizeof(dst),
test_vector.src_bit_offset, test_vector.dst_bit_offset,
test_vector.bit_count);
EXPECT_EQ(test_vector.expected_dst, dst);
}
}
TEST(CopyBitsTest, Overflow) {
const struct {
uint32_t src;
uint32_t dst;
unsigned int src_bit_offset;
unsigned int dst_bit_offset;
unsigned int bit_count;
uint32_t expected_dst;
} kTestVectorList[] = {
{ 0x000000FF, 0x00000000, 0, 0, 8, 0x000000FF },
{ 0x000000FF, 0x00000000, 0, 24, 8, 0xFF000000 },
{ 0x000000FF, 0x00000000, 0, 25, 8, 0x00000000 },
{ 0x000000FF, 0x00000000, 0, 32, 8, 0x00000000 },
{ 0x000000FF, 0x00000000, 0, UINT_MAX, 8, 0x00000000 },
{ 0x000000FF, 0x00000000, 0, 8, UINT_MAX, 0x00000000 },
};
for (auto test_vector : kTestVectorList) {
uint32_t dst = test_vector.dst;
copyBits(&(test_vector.src), &dst, sizeof(dst),
test_vector.src_bit_offset, test_vector.dst_bit_offset,
test_vector.bit_count);
EXPECT_EQ(test_vector.expected_dst, dst);
}
}
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