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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 
20 using namespace llvm;
21 
22 namespace {
23 
24 #if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
25 
TestZlibCompression(StringRef Input,zlib::CompressionLevel Level)26 void 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 
TEST(CompressionTest,Zlib)41 TEST(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 
TEST(CompressionTest,ZlibCRC32)62 TEST(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