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/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
  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
  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 }