Expose CRC-32 implementation from zlib
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188380 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Support/Compression.h b/include/llvm/Support/Compression.h
index 9b1142d..bef9146 100644
--- a/include/llvm/Support/Compression.h
+++ b/include/llvm/Support/Compression.h
@@ -50,6 +50,8 @@
OwningPtr<MemoryBuffer> &UncompressedBuffer,
size_t UncompressedSize);
+uint32_t crc32(StringRef Buffer);
+
} // End of namespace zlib
} // End of namespace llvm
diff --git a/lib/Support/Compression.cpp b/lib/Support/Compression.cpp
index fd8a874..b5ddb70 100644
--- a/lib/Support/Compression.cpp
+++ b/lib/Support/Compression.cpp
@@ -81,6 +81,10 @@
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 @@
size_t UncompressedSize) {
return zlib::StatusUnsupported;
}
+uint32_t zlib::crc32(StringRef Buffer) {
+ llvm_unreachable("zlib::crc32 is unavailable");
+}
#endif
diff --git a/unittests/Support/CompressionTest.cpp b/unittests/Support/CompressionTest.cpp
index c8e2cd9..c0a9ada 100644
--- a/unittests/Support/CompressionTest.cpp
+++ b/unittests/Support/CompressionTest.cpp
@@ -63,6 +63,12 @@
TestZlibCompression(BinaryDataStr, zlib::DefaultCompression);
}
+TEST(CompressionTest, ZlibCRC32) {
+ EXPECT_EQ(
+ 0x414FA339U,
+ zlib::crc32(StringRef("The quick brown fox jumps over the lazy dog")));
+}
+
#endif
}