1 // Copyright 2020 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14
15 #include "pw_stream/interval_reader.h"
16
17 #include "pw_result/result.h"
18 #include "pw_stream/memory_stream.h"
19 #include "pw_unit_test/framework.h"
20
21 namespace pw::stream {
22 namespace {
23
TEST(IntervalReader,IntervalReaderRead)24 TEST(IntervalReader, IntervalReaderRead) {
25 std::uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 9, 10};
26 stream::MemoryReader reader(as_bytes(span(data)));
27 IntervalReader reader_first_half(reader, 0, 5);
28 IntervalReader reader_second_half(reader, 5, 10);
29
30 // Read second half
31 std::byte read_buf[5];
32 Result<ByteSpan> res = reader_second_half.Read(read_buf);
33 ASSERT_EQ(res.status(), OkStatus());
34 ASSERT_EQ(res.value().size(), sizeof(read_buf));
35 ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
36 ASSERT_EQ(reader_second_half.Read(read_buf).status(), Status::OutOfRange());
37
38 // Read first half. They should be independent and do not interfere each
39 // other.
40 res = reader_first_half.Read(read_buf);
41 ASSERT_EQ(res.status(), OkStatus());
42 ASSERT_EQ(res.value().size(), sizeof(read_buf));
43 ASSERT_EQ(memcmp(read_buf, data, 5), 0);
44 ASSERT_EQ(reader_first_half.Read(read_buf).status(), Status::OutOfRange());
45
46 // Reset the cursor and the reader should read from the beginning.
47 res = reader_second_half.Reset().Read(read_buf);
48 ASSERT_EQ(res.status(), OkStatus());
49 ASSERT_EQ(res.value().size(), sizeof(read_buf));
50 ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
51 ASSERT_EQ(reader_second_half.Read(read_buf).status(), Status::OutOfRange());
52 }
53
TEST(IntervalReader,IntervalReaderSeek)54 TEST(IntervalReader, IntervalReaderSeek) {
55 std::uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 9, 10};
56 stream::MemoryReader reader(as_bytes(span(data)));
57 IntervalReader interval_reader(reader, 0, 10);
58
59 // Absolute seeking.
60 std::byte read_buf[5];
61 ASSERT_EQ(interval_reader.Seek(5), OkStatus());
62 Result<ByteSpan> res = interval_reader.Read(read_buf);
63 ASSERT_EQ(res.status(), OkStatus());
64 ASSERT_EQ(res.value().size(), sizeof(read_buf));
65 ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
66 ASSERT_EQ(interval_reader.Read(read_buf).status(), Status::OutOfRange());
67
68 // Relative seek.
69 ASSERT_EQ(interval_reader.Seek(-10, stream::Stream::kCurrent), OkStatus());
70 res = interval_reader.Read(read_buf);
71 ASSERT_EQ(res.status(), OkStatus());
72 ASSERT_EQ(res.value().size(), sizeof(read_buf));
73 ASSERT_EQ(memcmp(read_buf, data, 5), 0);
74
75 // Seeking from the end.
76 ASSERT_EQ(interval_reader.Seek(-5, stream::Stream::kEnd), OkStatus());
77 res = interval_reader.Read(read_buf);
78 ASSERT_EQ(res.status(), OkStatus());
79 ASSERT_EQ(res.value().size(), sizeof(read_buf));
80 ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
81 ASSERT_EQ(interval_reader.Read(read_buf).status(), Status::OutOfRange());
82
83 // Seeking to the end is allowed
84 ASSERT_EQ(interval_reader.Seek(0, stream::Stream::kEnd), OkStatus());
85 ASSERT_EQ(interval_reader.Read(read_buf).status(), Status::OutOfRange());
86 }
87
88 } // namespace
89 } // namespace pw::stream
90