unittests/Support/CompressionTest.cpp

   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   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, zlib::uncompress(Compressed->getBuffer(),
  32                                              Uncompressed, Input.size()));
  33   EXPECT_EQ(Input.size(), Uncompressed.size());
  34   EXPECT_EQ(0, memcmp(Input.data(), Uncompressed.data(), Input.size()));
  35   if (Input.size() > 0) {
  36     // Uncompression fails if expected length is too short.
  37     EXPECT_EQ(zlib::StatusBufferTooShort,
  38               zlib::uncompress(Compressed->getBuffer(), Uncompressed,
  39                                Input.size() - 1));
  40   }
  41 }
  42
  43 TEST(CompressionTest, Zlib) {
  44   TestZlibCompression("", zlib::DefaultCompression);
  45
  46   TestZlibCompression("hello, world!", zlib::NoCompression);
  47   TestZlibCompression("hello, world!", zlib::BestSizeCompression);
  48   TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
  49   TestZlibCompression("hello, world!", zlib::DefaultCompression);
  50
  51   const size_t kSize = 1024;
  52   char BinaryData[kSize];
  53   for (size_t i = 0; i < kSize; ++i) {
  54     BinaryData[i] = i & 255;
  55   }
  56   StringRef BinaryDataStr(BinaryData, kSize);
  57
  58   TestZlibCompression(BinaryDataStr, zlib::NoCompression);
  59   TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
  60   TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
  61   TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
  62 }
  63
  64 TEST(CompressionTest, ZlibCRC32) {
  65   EXPECT_EQ(
  66       0x414FA339U,
  67       zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
  68 }
  69
  70 #endif
  71
  72 }