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Expose CRC-32 implementation from zlib 

llvm-svn: 188380
This commit is contained in:
Alexey Samsonov 2013-08-14 16:03:29 +00:00
parent 16b934d624
commit 6ede706d46
3 changed files with 15 additions and 0 deletions
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2
llvm/include/llvm/Support/Compression.h
View File

@ -50,6 +50,8 @@ Status uncompress(StringRef InputBuffer,
OwningPtr<MemoryBuffer> &UncompressedBuffer,
size_t UncompressedSize);
uint32_t crc32(StringRef Buffer);
} // End of namespace zlib
} // End of namespace llvm

7
llvm/lib/Support/Compression.cpp
View File

@ -81,6 +81,10 @@ zlib::Status zlib::uncompress(StringRef InputBuffer,
return Res;
}
uint32_t zlib::crc32(StringRef Buffer) {
return ::crc32(0, (const Bytef *)Buffer.data(), Buffer.size());
}
#else
bool zlib::isAvailable() { return false; }
zlib::Status zlib::compress(StringRef InputBuffer,
@ -93,5 +97,8 @@ zlib::Status zlib::uncompress(StringRef InputBuffer,
size_t UncompressedSize) {
return zlib::StatusUnsupported;
}
uint32_t zlib::crc32(StringRef Buffer) {
llvm_unreachable("zlib::crc32 is unavailable");
}
#endif

6
llvm/unittests/Support/CompressionTest.cpp
View File

@ -63,6 +63,12 @@ TEST(CompressionTest, Zlib) {
TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
}
TEST(CompressionTest, ZlibCRC32) {
EXPECT_EQ(
0x414FA339U,
zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
}
#endif
}