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122 lines
5 KiB
C++
122 lines
5 KiB
C++
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/*
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* Copyright (c) 2023, Tim Schumacher <timschumi@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/BitStream.h>
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#include <LibCore/MemoryStream.h>
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#include <LibTest/TestCase.h>
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// Note: This does not do any checks on the internal representation, it just ensures that the behavior of the input and output streams match.
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TEST_CASE(little_endian_bit_stream_input_output_match)
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{
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auto memory_stream = make<Core::Stream::AllocatingMemoryStream>();
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// Note: The bit stream only ever reads from/writes to the underlying stream in one byte chunks,
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// so testing with sizes that will not trigger a write will yield unexpected results.
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auto bit_write_stream = MUST(LittleEndianOutputBitStream::construct(MaybeOwned<AK::Stream>(*memory_stream)));
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auto bit_read_stream = MUST(LittleEndianInputBitStream::construct(MaybeOwned<AK::Stream>(*memory_stream)));
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// Test two mirrored chunks of a fully mirrored pattern to check that we are not dropping bits.
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{
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MUST(bit_write_stream->write_bits(0b1111u, 4));
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MUST(bit_write_stream->write_bits(0b1111u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1111u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1111u, result);
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}
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{
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MUST(bit_write_stream->write_bits(0b0000u, 4));
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MUST(bit_write_stream->write_bits(0b0000u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b0000u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b0000u, result);
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}
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// Test two mirrored chunks of a non-mirrored pattern to check that we are writing bits within a pattern in the correct order.
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{
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MUST(bit_write_stream->write_bits(0b1000u, 4));
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MUST(bit_write_stream->write_bits(0b1000u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1000u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1000u, result);
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}
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// Test two different chunks to check that we are not confusing their order.
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{
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MUST(bit_write_stream->write_bits(0b1000u, 4));
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MUST(bit_write_stream->write_bits(0b0100u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1000u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b0100u, result);
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}
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// Test a pattern that spans multiple bytes.
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{
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MUST(bit_write_stream->write_bits(0b1101001000100001u, 16));
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auto result = MUST(bit_read_stream->read_bits(16));
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EXPECT_EQ(0b1101001000100001u, result);
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}
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}
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// Note: This does not do any checks on the internal representation, it just ensures that the behavior of the input and output streams match.
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TEST_CASE(big_endian_bit_stream_input_output_match)
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{
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auto memory_stream = make<Core::Stream::AllocatingMemoryStream>();
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// Note: The bit stream only ever reads from/writes to the underlying stream in one byte chunks,
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// so testing with sizes that will not trigger a write will yield unexpected results.
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auto bit_write_stream = MUST(BigEndianOutputBitStream::construct(MaybeOwned<AK::Stream>(*memory_stream)));
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auto bit_read_stream = MUST(BigEndianInputBitStream::construct(MaybeOwned<AK::Stream>(*memory_stream)));
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// Test two mirrored chunks of a fully mirrored pattern to check that we are not dropping bits.
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{
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MUST(bit_write_stream->write_bits(0b1111u, 4));
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MUST(bit_write_stream->write_bits(0b1111u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1111u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1111u, result);
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}
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{
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MUST(bit_write_stream->write_bits(0b0000u, 4));
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MUST(bit_write_stream->write_bits(0b0000u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b0000u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b0000u, result);
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}
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// Test two mirrored chunks of a non-mirrored pattern to check that we are writing bits within a pattern in the correct order.
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{
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MUST(bit_write_stream->write_bits(0b1000u, 4));
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MUST(bit_write_stream->write_bits(0b1000u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1000u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1000u, result);
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}
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// Test two different chunks to check that we are not confusing their order.
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{
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MUST(bit_write_stream->write_bits(0b1000u, 4));
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MUST(bit_write_stream->write_bits(0b0100u, 4));
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auto result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b1000u, result);
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result = MUST(bit_read_stream->read_bits(4));
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EXPECT_EQ(0b0100u, result);
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}
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// Test a pattern that spans multiple bytes.
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{
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MUST(bit_write_stream->write_bits(0b1101001000100001u, 16));
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auto result = MUST(bit_read_stream->read_bits(16));
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EXPECT_EQ(0b1101001000100001u, result);
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}
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}
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