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test-compress: Add DEFLATE compression tests

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This commit is contained in:
Idan Horowitz 2021-03-13 01:23:34 +02:00 • committed by Andreas Kling
parent bcbfa7db62
commit 02569bec11
1 changed files with 38 additions and 1 deletions
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39
Userland/Utilities/test-compress.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, the SerenityOS developers.
* Copyright (c) 2020-2021, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -28,9 +28,11 @@
#include <AK/Array.h>
#include <AK/MemoryStream.h>
#include <AK/Random.h>
#include <LibCompress/Deflate.h>
#include <LibCompress/Gzip.h>
#include <LibCompress/Zlib.h>
#include <string.h>
TEST_CASE(canonical_code_simple)
{
@ -131,6 +133,41 @@ TEST_CASE(deflate_decompress_zeroes)
EXPECT(uncompressed == decompressed.value().bytes());
}
TEST_CASE(deflate_round_trip_store)
{
auto original = ByteBuffer::create_uninitialized(1024);
fill_with_random(original.data(), 1024);
auto compressed = Compress::DeflateCompressor::compress_all(original, Compress::DeflateCompressor::CompressionLevel::STORE);
EXPECT(compressed.has_value());
auto uncompressed = Compress::DeflateDecompressor::decompress_all(compressed.value());
EXPECT(uncompressed.has_value());
EXPECT(uncompressed.value() == original);
}
TEST_CASE(deflate_round_trip_compress)
{
auto original = ByteBuffer::create_uninitialized(2048);
fill_with_random(original.data(), 1024);
memset(original.offset_pointer(1024), 0, 1024); // we fill the second half with 0s to make sure we test back references as well
// Since the different levels just change how much time is spent looking for better matches, just use fast here to reduce test time
auto compressed = Compress::DeflateCompressor::compress_all(original, Compress::DeflateCompressor::CompressionLevel::FAST);
EXPECT(compressed.has_value());
auto uncompressed = Compress::DeflateDecompressor::decompress_all(compressed.value());
EXPECT(uncompressed.has_value());
EXPECT(uncompressed.value() == original);
}
TEST_CASE(deflate_round_trip_compress_large)
{
auto original = ByteBuffer::create_uninitialized(Compress::DeflateCompressor::block_size * 2); // Compress a buffer larger than the maximum block size to test the sliding window mechanism
// Since the different levels just change how much time is spent looking for better matches, just use fast here to reduce test time
auto compressed = Compress::DeflateCompressor::compress_all(original, Compress::DeflateCompressor::CompressionLevel::FAST);
EXPECT(compressed.has_value());
auto uncompressed = Compress::DeflateDecompressor::decompress_all(compressed.value());
EXPECT(uncompressed.has_value());
EXPECT(uncompressed.value() == original);
}
TEST_CASE(zlib_decompress_simple)
{
const Array<u8, 40> compressed {