1 files changed, 49 insertions, 0 deletions
diff --git a/clang-r344140b/include/llvm/Support/JamCRC.h b/clang-r344140b/include/llvm/Support/JamCRC.h
new file mode 100644
index 00000000..846d6cea
--- /dev/null
+++ b/clang-r344140b/include/llvm/Support/JamCRC.h
@@ -0,0 +1,49 @@
+//===-- llvm/Support/JamCRC.h - Cyclic Redundancy Check ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains an implementation of 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")
+//
+// N.B.  We permit flexibility of the "Init" value.  Some consumers of this need
+//       it to be zero.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_JAMCRC_H
+#define LLVM_SUPPORT_JAMCRC_H
+
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+template <typename T> class ArrayRef;
+
+class JamCRC {
+public:
+  JamCRC(uint32_t Init = 0xFFFFFFFFU) : CRC(Init) {}
+
+  // Update the CRC calculation with Data.
+  void update(ArrayRef<char> Data);
+
+  uint32_t getCRC() const { return CRC; }
+
+private:
+  uint32_t CRC;
+};
+} // End of namespace llvm
+
+#endif