Yecheng Zhao | 321fb69 | 2021-09-06 10:26:04 -0700 | [diff] [blame] | 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 "gtest/gtest.h" |
| 18 | #include "pw_result/result.h" |
| 19 | #include "pw_stream/memory_stream.h" |
| 20 | |
| 21 | namespace pw::stream { |
| 22 | namespace { |
| 23 | |
| 24 | TEST(IntervalReader, IntervalReaderRead) { |
| 25 | std::uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 9, 10}; |
| 26 | stream::MemoryReader reader(std::as_bytes(std::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 | |
| 54 | TEST(IntervalReader, IntervalReaderSeek) { |
| 55 | std::uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 9, 10}; |
| 56 | stream::MemoryReader reader(std::as_bytes(std::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 |