CompressionTest.cpp
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//===- llvm/unittest/Support/CompressionTest.cpp - Compression tests ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements unit tests for the Compression functions.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Compression.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Error.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
#if LLVM_ENABLE_ZLIB
void TestZlibCompression(StringRef Input, int Level) {
SmallString<32> Compressed;
SmallString<32> Uncompressed;
Error E = zlib::compress(Input, Compressed, Level);
EXPECT_FALSE(E);
consumeError(std::move(E));
// Check that uncompressed buffer is the same as original.
E = zlib::uncompress(Compressed, Uncompressed, Input.size());
EXPECT_FALSE(E);
consumeError(std::move(E));
EXPECT_EQ(Input, Uncompressed);
if (Input.size() > 0) {
// Uncompression fails if expected length is too short.
E = zlib::uncompress(Compressed, Uncompressed, Input.size() - 1);
EXPECT_EQ("zlib error: Z_BUF_ERROR", llvm::toString(std::move(E)));
}
}
TEST(CompressionTest, Zlib) {
TestZlibCompression("", zlib::DefaultCompression);
TestZlibCompression("hello, world!", zlib::NoCompression);
TestZlibCompression("hello, world!", zlib::BestSizeCompression);
TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
TestZlibCompression("hello, world!", zlib::DefaultCompression);
const size_t kSize = 1024;
char BinaryData[kSize];
for (size_t i = 0; i < kSize; ++i) {
BinaryData[i] = i & 255;
}
StringRef BinaryDataStr(BinaryData, kSize);
TestZlibCompression(BinaryDataStr, zlib::NoCompression);
TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
}
TEST(CompressionTest, ZlibCRC32) {
EXPECT_EQ(
0x414FA339U,
zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
}
#endif
}