1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "HidUtils.h"
18 #include <gtest/gtest.h>
19
20 using HidUtil::copyBits;
21
TEST(CopyBitsTest,CopyBits)22 TEST(CopyBitsTest, CopyBits) {
23 const struct {
24 uint32_t src;
25 uint32_t dst;
26 int src_bit_offset;
27 int dst_bit_offset;
28 int bit_count;
29 uint32_t expected_dst;
30 } kTestVectorList[] = {
31 { 0x00000005, 0x00000000, 0, 0, 8, 0x00000005 },
32 { 0x00000005, 0x00000000, 0, 4, 8, 0x00000050 },
33 { 0x0000000C, 0x00000020, 0, 4, 8, 0x000000C0 },
34 { 0x00000005, 0x0000F02F, 0, 4, 8, 0x0000F05F },
35 { 0x12345678, 0x87654321, 5, 11, 17, 0x8D159B21 },
36 { 0x12345678, 0x87654321, 11, 5, 17, 0x8748D141 },
37 };
38
39 for (auto test_vector : kTestVectorList) {
40 uint32_t dst = test_vector.dst;
41 copyBits(&(test_vector.src), &dst, sizeof(dst),
42 test_vector.src_bit_offset, test_vector.dst_bit_offset,
43 test_vector.bit_count);
44 EXPECT_EQ(test_vector.expected_dst, dst);
45 }
46 }
47
TEST(CopyBitsTest,Overflow)48 TEST(CopyBitsTest, Overflow) {
49 const struct {
50 uint32_t src;
51 uint32_t dst;
52 unsigned int src_bit_offset;
53 unsigned int dst_bit_offset;
54 unsigned int bit_count;
55 uint32_t expected_dst;
56 } kTestVectorList[] = {
57 { 0x000000FF, 0x00000000, 0, 0, 8, 0x000000FF },
58 { 0x000000FF, 0x00000000, 0, 24, 8, 0xFF000000 },
59 { 0x000000FF, 0x00000000, 0, 25, 8, 0x00000000 },
60 { 0x000000FF, 0x00000000, 0, 32, 8, 0x00000000 },
61 { 0x000000FF, 0x00000000, 0, UINT_MAX, 8, 0x00000000 },
62 { 0x000000FF, 0x00000000, 0, 8, UINT_MAX, 0x00000000 },
63 };
64
65 for (auto test_vector : kTestVectorList) {
66 uint32_t dst = test_vector.dst;
67 copyBits(&(test_vector.src), &dst, sizeof(dst),
68 test_vector.src_bit_offset, test_vector.dst_bit_offset,
69 test_vector.bit_count);
70 EXPECT_EQ(test_vector.expected_dst, dst);
71 }
72 }
73
74