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   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 }