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1 //===- llvm/unittest/Support/CompressionTest.cpp - Compression tests ------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements unit tests for the Compression functions.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Support/Compression.h"
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83
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15 #include "llvm/ADT/SmallString.h"
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16 #include "llvm/ADT/StringRef.h"
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17 #include "llvm/Config/config.h"
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18 #include "gtest/gtest.h"
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19
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20 using namespace llvm;
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21
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22 namespace {
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23
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24 #if LLVM_ENABLE_ZLIB == 1 && HAVE_LIBZ
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25
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26 void TestZlibCompression(StringRef Input, zlib::CompressionLevel Level) {
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27 SmallString<32> Compressed;
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28 SmallString<32> Uncompressed;
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29 EXPECT_EQ(zlib::StatusOK, zlib::compress(Input, Compressed, Level));
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30 // Check that uncompressed buffer is the same as original.
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31 EXPECT_EQ(zlib::StatusOK,
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32 zlib::uncompress(Compressed, Uncompressed, Input.size()));
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33 EXPECT_EQ(Input, Uncompressed);
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34 if (Input.size() > 0) {
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35 // Uncompression fails if expected length is too short.
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36 EXPECT_EQ(zlib::StatusBufferTooShort,
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37 zlib::uncompress(Compressed, Uncompressed, Input.size() - 1));
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38 }
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39 }
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40
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41 TEST(CompressionTest, Zlib) {
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42 TestZlibCompression("", zlib::DefaultCompression);
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43
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44 TestZlibCompression("hello, world!", zlib::NoCompression);
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45 TestZlibCompression("hello, world!", zlib::BestSizeCompression);
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46 TestZlibCompression("hello, world!", zlib::BestSpeedCompression);
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47 TestZlibCompression("hello, world!", zlib::DefaultCompression);
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48
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49 const size_t kSize = 1024;
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50 char BinaryData[kSize];
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51 for (size_t i = 0; i < kSize; ++i) {
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52 BinaryData[i] = i & 255;
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53 }
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54 StringRef BinaryDataStr(BinaryData, kSize);
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55
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56 TestZlibCompression(BinaryDataStr, zlib::NoCompression);
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57 TestZlibCompression(BinaryDataStr, zlib::BestSizeCompression);
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58 TestZlibCompression(BinaryDataStr, zlib::BestSpeedCompression);
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59 TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
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60 }
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61
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62 TEST(CompressionTest, ZlibCRC32) {
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63 EXPECT_EQ(
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64 0x414FA339U,
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65 zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
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66 }
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67
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68 #endif
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69
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70 }
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