FileStream_test.cpp revision 004511660671511ae88e0e837a6f92db28eadaef 
1/*
2 * Copyright (C) 2017 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 "io/FileStream.h"
18
19#include "android-base/macros.h"
20#include "android-base/test_utils.h"
21
22#include "test/Test.h"
23
24using ::android::StringPiece;
25using ::testing::Eq;
26using ::testing::NotNull;
27using ::testing::StrEq;
28
29namespace aapt {
30namespace io {
31
32TEST(FileInputStreamTest, NextAndBackup) {
33  std::string input = "this is a cool string";
34  TemporaryFile file;
35  ASSERT_THAT(TEMP_FAILURE_RETRY(write(file.fd, input.c_str(), input.size())), Eq(21));
36  lseek64(file.fd, 0, SEEK_SET);
37
38  // Use a small buffer size so that we can call Next() a few times.
39  FileInputStream in(file.release(), 10u);
40  ASSERT_FALSE(in.HadError());
41  EXPECT_THAT(in.ByteCount(), Eq(0u));
42
43  const char* buffer;
44  size_t size;
45  ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size)) << in.GetError();
46  ASSERT_THAT(size, Eq(10u));
47  ASSERT_THAT(buffer, NotNull());
48  EXPECT_THAT(in.ByteCount(), Eq(10u));
49  EXPECT_THAT(StringPiece(buffer, size), Eq("this is a "));
50
51  ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
52  ASSERT_THAT(size, Eq(10u));
53  ASSERT_THAT(buffer, NotNull());
54  EXPECT_THAT(in.ByteCount(), Eq(20u));
55  EXPECT_THAT(StringPiece(buffer, size), Eq("cool strin"));
56
57  in.BackUp(5u);
58  EXPECT_THAT(in.ByteCount(), Eq(15u));
59
60  ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
61  ASSERT_THAT(size, Eq(5u));
62  ASSERT_THAT(buffer, NotNull());
63  ASSERT_THAT(in.ByteCount(), Eq(20u));
64  EXPECT_THAT(StringPiece(buffer, size), Eq("strin"));
65
66  // Backup 1 more than possible. Should clamp.
67  in.BackUp(11u);
68  EXPECT_THAT(in.ByteCount(), Eq(10u));
69
70  ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
71  ASSERT_THAT(size, Eq(10u));
72  ASSERT_THAT(buffer, NotNull());
73  ASSERT_THAT(in.ByteCount(), Eq(20u));
74  EXPECT_THAT(StringPiece(buffer, size), Eq("cool strin"));
75
76  ASSERT_TRUE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
77  ASSERT_THAT(size, Eq(1u));
78  ASSERT_THAT(buffer, NotNull());
79  ASSERT_THAT(in.ByteCount(), Eq(21u));
80  EXPECT_THAT(StringPiece(buffer, size), Eq("g"));
81
82  EXPECT_FALSE(in.Next(reinterpret_cast<const void**>(&buffer), &size));
83  EXPECT_FALSE(in.HadError());
84}
85
86TEST(FileOutputStreamTest, NextAndBackup) {
87  const std::string input = "this is a cool string";
88
89  TemporaryFile file;
90  int fd = file.release();
91
92  // FileOutputStream takes ownership.
93  FileOutputStream out(fd, 10u);
94  ASSERT_FALSE(out.HadError());
95  EXPECT_THAT(out.ByteCount(), Eq(0u));
96
97  char* buffer;
98  size_t size;
99  ASSERT_TRUE(out.Next(reinterpret_cast<void**>(&buffer), &size));
100  ASSERT_THAT(size, Eq(10u));
101  ASSERT_THAT(buffer, NotNull());
102  EXPECT_THAT(out.ByteCount(), Eq(10u));
103  memcpy(buffer, input.c_str(), size);
104
105  ASSERT_TRUE(out.Next(reinterpret_cast<void**>(&buffer), &size));
106  ASSERT_THAT(size, Eq(10u));
107  ASSERT_THAT(buffer, NotNull());
108  EXPECT_THAT(out.ByteCount(), Eq(20u));
109  memcpy(buffer, input.c_str() + 10u, size);
110
111  ASSERT_TRUE(out.Next(reinterpret_cast<void**>(&buffer), &size));
112  ASSERT_THAT(size, Eq(10u));
113  ASSERT_THAT(buffer, NotNull());
114  EXPECT_THAT(out.ByteCount(), Eq(30u));
115  buffer[0] = input[20u];
116  out.BackUp(size - 1);
117  EXPECT_THAT(out.ByteCount(), Eq(21u));
118
119  ASSERT_TRUE(out.Flush());
120
121  lseek64(fd, 0, SEEK_SET);
122
123  std::string actual;
124  ASSERT_TRUE(android::base::ReadFdToString(fd, &actual));
125  EXPECT_THAT(actual, StrEq(input));
126}
127
128}  // namespace io
129}  // namespace aapt
130