1 //===--- CRC.cpp - Cyclic Redundancy Check implementation -----------------===//
9 // This file contains implementations of CRC functions.
15 // See also Ross N. Williams "A Painless Guide to CRC Error Detection
21 #include "llvm/Support/CRC.h"
75 uint32_t llvm::crc32(uint32_t CRC, ArrayRef<uint8_t> Data) {  in crc32()  argument
76   CRC ^= 0xFFFFFFFFU;  in crc32()
78     int TableIdx = (CRC ^ Byte) & 0xff;  in crc32()
79     CRC = CRCTable[TableIdx] ^ (CRC >> 8);  in crc32()
81   return CRC ^ 0xFFFFFFFFU;  in crc32()
87 uint32_t llvm::crc32(uint32_t CRC, ArrayRef<uint8_t> Data) {  in crc32()  argument
93     CRC = ::crc32(CRC, (const Bytef *)Slice.data(), (uInt)Slice.size());  in crc32()
96   return CRC;  in crc32()
104   CRC ^= 0xFFFFFFFFU; // Undo CRC-32 Init.  in update()
105   CRC = crc32(CRC, Data);  in update()
106   CRC ^= 0xFFFFFFFFU; // Undo CRC-32 XorOut.  in update()