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Zippy level 2 for denser compression and faster decompression

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We also increased the hashtable size by 1 bit as it significantly degraded the ratio. Thus even level 1 might slightly improve.

PiperOrigin-RevId: 621456036
This commit is contained in:
Snappy Team
2024-04-03 09:40:00 +00:00
committed by Danila Kutenin
parent 4f5cf9a8d6
commit 766d24c95e
5 changed files with 309 additions and 50 deletions
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32
snappy_compress_fuzzer.cc
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@@ -39,22 +39,26 @@
// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
std::string input(reinterpret_cast<const char*>(data), size);
for (int level = snappy::CompressionOptions::MinCompressionLevel();
level <= snappy::CompressionOptions::MaxCompressionLevel(); ++level) {
std::string compressed;
size_t compressed_size =
snappy::Compress(input.data(), input.size(), &compressed,
snappy::CompressionOptions{.level = level});
std::string compressed;
size_t compressed_size =
snappy::Compress(input.data(), input.size(), &compressed);
(void)compressed_size; // Variable only used in debug builds.
assert(compressed_size == compressed.size());
assert(compressed.size() <= snappy::MaxCompressedLength(input.size()));
assert(
snappy::IsValidCompressedBuffer(compressed.data(), compressed.size()));
(void)compressed_size; // Variable only used in debug builds.
assert(compressed_size == compressed.size());
assert(compressed.size() <= snappy::MaxCompressedLength(input.size()));
assert(snappy::IsValidCompressedBuffer(compressed.data(), compressed.size()));
std::string uncompressed_after_compress;
bool uncompress_succeeded = snappy::Uncompress(
compressed.data(), compressed.size(), &uncompressed_after_compress);
std::string uncompressed_after_compress;
bool uncompress_succeeded = snappy::Uncompress(
compressed.data(), compressed.size(), &uncompressed_after_compress);
(void)uncompress_succeeded; // Variable only used in debug builds.
assert(uncompress_succeeded);
assert(input == uncompressed_after_compress);
(void)uncompress_succeeded; // Variable only used in debug builds.
assert(uncompress_succeeded);
assert(input == uncompressed_after_compress);
}
return 0;
}