90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_stream/interval_reader.h"
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#include "gtest/gtest.h"
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#include "pw_result/result.h"
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#include "pw_stream/memory_stream.h"
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namespace pw::stream {
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namespace {
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TEST(IntervalReader, IntervalReaderRead) {
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std::uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 9, 10};
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stream::MemoryReader reader(std::as_bytes(std::span(data)));
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IntervalReader reader_first_half(reader, 0, 5);
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IntervalReader reader_second_half(reader, 5, 10);
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// Read second half
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std::byte read_buf[5];
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Result<ByteSpan> res = reader_second_half.Read(read_buf);
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ASSERT_EQ(res.status(), OkStatus());
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ASSERT_EQ(res.value().size(), sizeof(read_buf));
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ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
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ASSERT_EQ(reader_second_half.Read(read_buf).status(), Status::OutOfRange());
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// Read first half. They should be independent and do not interfere each
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// other.
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res = reader_first_half.Read(read_buf);
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ASSERT_EQ(res.status(), OkStatus());
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ASSERT_EQ(res.value().size(), sizeof(read_buf));
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ASSERT_EQ(memcmp(read_buf, data, 5), 0);
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ASSERT_EQ(reader_first_half.Read(read_buf).status(), Status::OutOfRange());
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// Reset the cursor and the reader should read from the beginning.
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res = reader_second_half.Reset().Read(read_buf);
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ASSERT_EQ(res.status(), OkStatus());
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ASSERT_EQ(res.value().size(), sizeof(read_buf));
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ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
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ASSERT_EQ(reader_second_half.Read(read_buf).status(), Status::OutOfRange());
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}
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TEST(IntervalReader, IntervalReaderSeek) {
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std::uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 9, 10};
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stream::MemoryReader reader(std::as_bytes(std::span(data)));
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IntervalReader interval_reader(reader, 0, 10);
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// Absolute seeking.
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std::byte read_buf[5];
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ASSERT_EQ(interval_reader.Seek(5), OkStatus());
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Result<ByteSpan> res = interval_reader.Read(read_buf);
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ASSERT_EQ(res.status(), OkStatus());
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ASSERT_EQ(res.value().size(), sizeof(read_buf));
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ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
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ASSERT_EQ(interval_reader.Read(read_buf).status(), Status::OutOfRange());
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// Relative seek.
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ASSERT_EQ(interval_reader.Seek(-10, stream::Stream::kCurrent), OkStatus());
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res = interval_reader.Read(read_buf);
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ASSERT_EQ(res.status(), OkStatus());
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ASSERT_EQ(res.value().size(), sizeof(read_buf));
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ASSERT_EQ(memcmp(read_buf, data, 5), 0);
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// Seeking from the end.
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ASSERT_EQ(interval_reader.Seek(-5, stream::Stream::kEnd), OkStatus());
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res = interval_reader.Read(read_buf);
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ASSERT_EQ(res.status(), OkStatus());
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ASSERT_EQ(res.value().size(), sizeof(read_buf));
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ASSERT_EQ(memcmp(read_buf, data + 5, 5), 0);
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ASSERT_EQ(interval_reader.Read(read_buf).status(), Status::OutOfRange());
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// Seeking to the end is allowed
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ASSERT_EQ(interval_reader.Seek(0, stream::Stream::kEnd), OkStatus());
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ASSERT_EQ(interval_reader.Read(read_buf).status(), Status::OutOfRange());
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}
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} // namespace
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} // namespace pw::stream
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