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/OwningPtr.h"
16 #include "llvm/ADT/StringRef.h"
17 #include "llvm/Config/config.h"
18 #include "llvm/Support/MemoryBuffer.h"
19 #include "gtest/gtest.h"
20
21 using namespace llvm;
22
23 namespace {
24
25 #if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
26
TestZlibCompression(StringRef Input,zlib::CompressionLevel Level)27 void TestZlibCompression(StringRef Input, zlib::CompressionLevel Level) {
28 OwningPtr<MemoryBuffer> Compressed;
29 OwningPtr<MemoryBuffer> Uncompressed;
30 EXPECT_EQ(zlib::StatusOK, zlib::compress(Input, Compressed, Level));
31 // Check that uncompressed buffer is the same as original.
32 EXPECT_EQ(zlib::StatusOK, zlib::uncompress(Compressed->getBuffer(),
33 Uncompressed, Input.size()));
34 EXPECT_EQ(Input.size(), Uncompressed->getBufferSize());
35 EXPECT_EQ(0,
36 memcmp(Input.data(), Uncompressed->getBufferStart(), Input.size()));
37 if (Input.size() > 0) {
38 // Uncompression fails if expected length is too short.
39 EXPECT_EQ(zlib::StatusBufferTooShort,
40 zlib::uncompress(Compressed->getBuffer(), Uncompressed,
41 Input.size() - 1));
42 }
43 }
44
TEST(CompressionTest,Zlib)45 TEST(CompressionTest, Zlib) {
46 TestZlibCompression("", zlib::DefaultCompression);
47
48 TestZlibCompression("hello, world!", zlib::NoCompression);
49 TestZlibCompression("hello, world!", zlib::BestSizeCompression);
50 TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
51 TestZlibCompression("hello, world!", zlib::DefaultCompression);
52
53 const size_t kSize = 1024;
54 char BinaryData[kSize];
55 for (size_t i = 0; i < kSize; ++i) {
56 BinaryData[i] = i & 255;
57 }
58 StringRef BinaryDataStr(BinaryData, kSize);
59
60 TestZlibCompression(BinaryDataStr, zlib::NoCompression);
61 TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
62 TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
63 TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
64 }
65
66 #endif
67
68 }
69