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/Config/config.h"
17 #include "llvm/Support/MemoryBuffer.h"
18 #include "gtest/gtest.h"
19 
20 using namespace llvm;
21 
22 namespace {
23 
24 #if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
25 
26 void TestZlibCompression(StringRef Input, zlib::CompressionLevel Level) {
27   std::unique_ptr<MemoryBuffer> Compressed;
28   std::unique_ptr<MemoryBuffer> 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, zlib::uncompress(Compressed->getBuffer(),
32                                              Uncompressed, Input.size()));
33   EXPECT_EQ(Input.size(), Uncompressed->getBufferSize());
34   EXPECT_EQ(0,
35             memcmp(Input.data(), Uncompressed->getBufferStart(), Input.size()));
36   if (Input.size() > 0) {
37     // Uncompression fails if expected length is too short.
38     EXPECT_EQ(zlib::StatusBufferTooShort,
39               zlib::uncompress(Compressed->getBuffer(), Uncompressed,
40                                Input.size() - 1));
41   }
42 }
43 
44 TEST(CompressionTest, Zlib) {
45   TestZlibCompression("", zlib::DefaultCompression);
46 
47   TestZlibCompression("hello, world!", zlib::NoCompression);
48   TestZlibCompression("hello, world!", zlib::BestSizeCompression);
49   TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
50   TestZlibCompression("hello, world!", zlib::DefaultCompression);
51 
52   const size_t kSize = 1024;
53   char BinaryData[kSize];
54   for (size_t i = 0; i < kSize; ++i) {
55     BinaryData[i] = i & 255;
56   }
57   StringRef BinaryDataStr(BinaryData, kSize);
58 
59   TestZlibCompression(BinaryDataStr, zlib::NoCompression);
60   TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
61   TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
62   TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
63 }
64 
65 TEST(CompressionTest, ZlibCRC32) {
66   EXPECT_EQ(
67       0x414FA339U,
68       zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
69 }
70 
71 #endif
72 
73 }
74