1//===- llvm/unittest/Support/CompressionTest.cpp - Compression tests ------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements unit tests for the Compression functions.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Support/Compression.h"
15#include "llvm/ADT/StringRef.h"
16#include "llvm/ADT/SmallString.h"
17#include "llvm/Config/config.h"
18#include "gtest/gtest.h"
19
20using namespace llvm;
21
22namespace {
23
24#if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
25
26void TestZlibCompression(StringRef Input, zlib::CompressionLevel Level) {
27  SmallString<32> Compressed;
28  SmallString<32> Uncompressed;
29  EXPECT_EQ(zlib::StatusOK, zlib::compress(Input, Compressed, Level));
30  // Check that uncompressed buffer is the same as original.
31  EXPECT_EQ(zlib::StatusOK,
32            zlib::uncompress(Compressed, Uncompressed, Input.size()));
33  EXPECT_EQ(Input, Uncompressed);
34  if (Input.size() > 0) {
35    // Uncompression fails if expected length is too short.
36    EXPECT_EQ(zlib::StatusBufferTooShort,
37              zlib::uncompress(Compressed, Uncompressed, Input.size() - 1));
38  }
39}
40
41TEST(CompressionTest, Zlib) {
42  TestZlibCompression("", zlib::DefaultCompression);
43
44  TestZlibCompression("hello, world!", zlib::NoCompression);
45  TestZlibCompression("hello, world!", zlib::BestSizeCompression);
46  TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
47  TestZlibCompression("hello, world!", zlib::DefaultCompression);
48
49  const size_t kSize = 1024;
50  char BinaryData[kSize];
51  for (size_t i = 0; i < kSize; ++i) {
52    BinaryData[i] = i & 255;
53  }
54  StringRef BinaryDataStr(BinaryData, kSize);
55
56  TestZlibCompression(BinaryDataStr, zlib::NoCompression);
57  TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
58  TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
59  TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
60}
61
62TEST(CompressionTest, ZlibCRC32) {
63  EXPECT_EQ(
64      0x414FA339U,
65      zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
66}
67
68#endif
69
70}
71