Update prebuilt Clang to r416183b from Android.
https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef
clang 12.0.5 (based on r416183b) from build 7284624.
Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/llvm/Support/CRC.h b/linux-x64/clang/include/llvm/Support/CRC.h
index 6ea8e3e..210890a 100644
--- a/linux-x64/clang/include/llvm/Support/CRC.h
+++ b/linux-x64/clang/include/llvm/Support/CRC.h
@@ -6,20 +6,55 @@
//
//===----------------------------------------------------------------------===//
//
-// This file contains basic functions for calculating Cyclic Redundancy Check
-// or CRC.
+// This file contains implementations of CRC functions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CRC_H
#define LLVM_SUPPORT_CRC_H
-#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
-/// zlib independent CRC32 calculation.
-uint32_t crc32(uint32_t CRC, StringRef S);
+template <typename T> class ArrayRef;
+
+// Compute the CRC-32 of Data.
+uint32_t crc32(ArrayRef<uint8_t> Data);
+
+// Compute the running CRC-32 of Data, with CRC being the previous value of the
+// checksum.
+uint32_t crc32(uint32_t CRC, ArrayRef<uint8_t> Data);
+
+// Class for computing the JamCRC.
+//
+// We will use the "Rocksoft^tm Model CRC Algorithm" to describe the properties
+// of this CRC:
+// Width : 32
+// Poly : 04C11DB7
+// Init : FFFFFFFF
+// RefIn : True
+// RefOut : True
+// XorOut : 00000000
+// Check : 340BC6D9 (result of CRC for "123456789")
+//
+// In other words, this is the same as CRC-32, except that XorOut is 0 instead
+// of FFFFFFFF.
+//
+// N.B. We permit flexibility of the "Init" value. Some consumers of this need
+// it to be zero.
+class JamCRC {
+public:
+ JamCRC(uint32_t Init = 0xFFFFFFFFU) : CRC(Init) {}
+
+ // Update the CRC calculation with Data.
+ void update(ArrayRef<uint8_t> Data);
+
+ uint32_t getCRC() const { return CRC; }
+
+private:
+ uint32_t CRC;
+};
+
} // end namespace llvm
#endif