00001 #ifndef __XRDOUCCRC_HH__ 00002 #define __XRDOUCCRC_HH__ 00003 /******************************************************************************/ 00004 /* */ 00005 /* X r d O u c C R C . h h */ 00006 /* */ 00007 /* (c) 2007 by the Board of Trustees of the Leland Stanford, Jr., University */ 00008 /* All Rights Reserved */ 00009 /* Produced by Andrew Hanushevsky for Stanford University under contract */ 00010 /* DE-AC02-76-SFO0515 with the Department of Energy */ 00011 /* */ 00012 /* This file is part of the XRootD software suite. */ 00013 /* */ 00014 /* XRootD is free software: you can redistribute it and/or modify it under */ 00015 /* the terms of the GNU Lesser General Public License as published by the */ 00016 /* Free Software Foundation, either version 3 of the License, or (at your */ 00017 /* option) any later version. */ 00018 /* */ 00019 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */ 00020 /* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */ 00021 /* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */ 00022 /* License for more details. */ 00023 /* */ 00024 /* You should have received a copy of the GNU Lesser General Public License */ 00025 /* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */ 00026 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */ 00027 /* */ 00028 /* The copyright holder's institutional names and contributor's names may not */ 00029 /* be used to endorse or promote products derived from this software without */ 00030 /* specific prior written permission of the institution or contributor. */ 00031 /******************************************************************************/ 00032 00033 #include <stddef.h> 00034 #include <stdint.h> 00035 00036 #include "XrdSys/XrdSysPageSize.hh" 00037 00038 class XrdOucCRC 00039 { 00040 public: 00041 00042 //------------------------------------------------------------------------------ 00046 // It is now better to use the CRC32C hardware assisted methods. 00052 //------------------------------------------------------------------------------ 00053 00054 static uint32_t CRC32(const unsigned char *data, int count); 00055 00056 //------------------------------------------------------------------------------ 00065 //------------------------------------------------------------------------------ 00066 00067 static uint32_t Calc32C(const void* data, size_t count, uint32_t prevcs=0); 00068 00069 //------------------------------------------------------------------------------ 00079 //------------------------------------------------------------------------------ 00080 00081 static void Calc32C(const void* data, size_t count, uint32_t* csval); 00082 00083 //------------------------------------------------------------------------------ 00093 //------------------------------------------------------------------------------ 00094 00095 static bool Ver32C(const void* data, size_t count, 00096 const uint32_t csval, uint32_t* csbad=0); 00097 00098 //------------------------------------------------------------------------------ 00111 //------------------------------------------------------------------------------ 00112 00113 static int Ver32C(const void* data, size_t count, 00114 const uint32_t* csval, uint32_t& valcs); 00115 00116 //------------------------------------------------------------------------------ 00130 //------------------------------------------------------------------------------ 00131 00132 static bool Ver32C(const void* data, size_t count, 00133 const uint32_t* csval, bool* valok); 00134 00135 //------------------------------------------------------------------------------ 00146 //------------------------------------------------------------------------------ 00147 00148 static bool Ver32C(const void* data, size_t count, 00149 const uint32_t* csval, uint32_t* valcs); 00150 00151 XrdOucCRC() {} 00152 ~XrdOucCRC() {} 00153 00154 private: 00155 00156 static unsigned int crctable[256]; 00157 }; 00158 #endif