// ----------------------------------------------------------------------
// File: CRC64.hh
// Author: Andreas-Joachim Peters - CERN
// ----------------------------------------------------------------------

/************************************************************************
 * EOS - the CERN Disk Storage System                                   *
 * Copyright (C) 2011 CERN/Switzerland                                  *
 *                                                                      *
 * This program is free software: you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation, either version 3 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.*
 ************************************************************************/

#ifndef __EOSFST_CRC64_HH__
#define __EOSFST_CRC64_HH__

/*----------------------------------------------------------------------------*/
#include "fst/Namespace.hh"
#include "fst/checksum/CheckSum.hh"
#include "common/crc32c/crc32c.h"
/*----------------------------------------------------------------------------*/
#include "XrdOuc/XrdOucEnv.hh"
#include "XrdOuc/XrdOucString.hh"
#include "XrdSys/XrdSysPthread.hh"
/*----------------------------------------------------------------------------*/
#include <zlib.h>
/*----------------------------------------------------------------------------*/

EOSFSTNAMESPACE_BEGIN

static const uint64_t crc64_tab[256] = {
  0x0000000000000000ULL, 0x42f0e1eba9ea3693ULL,
  0x85e1c3d753d46d26ULL, 0xc711223cfa3e5bb5ULL,
  0x493366450e42ecdfULL, 0x0bc387aea7a8da4cULL,
  0xccd2a5925d9681f9ULL, 0x8e224479f47cb76aULL,
  0x9266cc8a1c85d9beULL, 0xd0962d61b56fef2dULL,
  0x17870f5d4f51b498ULL, 0x5577eeb6e6bb820bULL,
  0xdb55aacf12c73561ULL, 0x99a54b24bb2d03f2ULL,
  0x5eb4691841135847ULL, 0x1c4488f3e8f96ed4ULL,
  0x663d78ff90e185efULL, 0x24cd9914390bb37cULL,
  0xe3dcbb28c335e8c9ULL, 0xa12c5ac36adfde5aULL,
  0x2f0e1eba9ea36930ULL, 0x6dfeff5137495fa3ULL,
  0xaaefdd6dcd770416ULL, 0xe81f3c86649d3285ULL,
  0xf45bb4758c645c51ULL, 0xb6ab559e258e6ac2ULL,
  0x71ba77a2dfb03177ULL, 0x334a9649765a07e4ULL,
  0xbd68d2308226b08eULL, 0xff9833db2bcc861dULL,
  0x388911e7d1f2dda8ULL, 0x7a79f00c7818eb3bULL,
  0xcc7af1ff21c30bdeULL, 0x8e8a101488293d4dULL,
  0x499b3228721766f8ULL, 0x0b6bd3c3dbfd506bULL,
  0x854997ba2f81e701ULL, 0xc7b97651866bd192ULL,
  0x00a8546d7c558a27ULL, 0x4258b586d5bfbcb4ULL,
  0x5e1c3d753d46d260ULL, 0x1cecdc9e94ace4f3ULL,
  0xdbfdfea26e92bf46ULL, 0x990d1f49c77889d5ULL,
  0x172f5b3033043ebfULL, 0x55dfbadb9aee082cULL,
  0x92ce98e760d05399ULL, 0xd03e790cc93a650aULL,
  0xaa478900b1228e31ULL, 0xe8b768eb18c8b8a2ULL,
  0x2fa64ad7e2f6e317ULL, 0x6d56ab3c4b1cd584ULL,
  0xe374ef45bf6062eeULL, 0xa1840eae168a547dULL,
  0x66952c92ecb40fc8ULL, 0x2465cd79455e395bULL,
  0x3821458aada7578fULL, 0x7ad1a461044d611cULL,
  0xbdc0865dfe733aa9ULL, 0xff3067b657990c3aULL,
  0x711223cfa3e5bb50ULL, 0x33e2c2240a0f8dc3ULL,
  0xf4f3e018f031d676ULL, 0xb60301f359dbe0e5ULL,
  0xda050215ea6c212fULL, 0x98f5e3fe438617bcULL,
  0x5fe4c1c2b9b84c09ULL, 0x1d14202910527a9aULL,
  0x93366450e42ecdf0ULL, 0xd1c685bb4dc4fb63ULL,
  0x16d7a787b7faa0d6ULL, 0x5427466c1e109645ULL,
  0x4863ce9ff6e9f891ULL, 0x0a932f745f03ce02ULL,
  0xcd820d48a53d95b7ULL, 0x8f72eca30cd7a324ULL,
  0x0150a8daf8ab144eULL, 0x43a04931514122ddULL,
  0x84b16b0dab7f7968ULL, 0xc6418ae602954ffbULL,
  0xbc387aea7a8da4c0ULL, 0xfec89b01d3679253ULL,
  0x39d9b93d2959c9e6ULL, 0x7b2958d680b3ff75ULL,
  0xf50b1caf74cf481fULL, 0xb7fbfd44dd257e8cULL,
  0x70eadf78271b2539ULL, 0x321a3e938ef113aaULL,
  0x2e5eb66066087d7eULL, 0x6cae578bcfe24bedULL,
  0xabbf75b735dc1058ULL, 0xe94f945c9c3626cbULL,
  0x676dd025684a91a1ULL, 0x259d31cec1a0a732ULL,
  0xe28c13f23b9efc87ULL, 0xa07cf2199274ca14ULL,
  0x167ff3eacbaf2af1ULL, 0x548f120162451c62ULL,
  0x939e303d987b47d7ULL, 0xd16ed1d631917144ULL,
  0x5f4c95afc5edc62eULL, 0x1dbc74446c07f0bdULL,
  0xdaad56789639ab08ULL, 0x985db7933fd39d9bULL,
  0x84193f60d72af34fULL, 0xc6e9de8b7ec0c5dcULL,
  0x01f8fcb784fe9e69ULL, 0x43081d5c2d14a8faULL,
  0xcd2a5925d9681f90ULL, 0x8fdab8ce70822903ULL,
  0x48cb9af28abc72b6ULL, 0x0a3b7b1923564425ULL,
  0x70428b155b4eaf1eULL, 0x32b26afef2a4998dULL,
  0xf5a348c2089ac238ULL, 0xb753a929a170f4abULL,
  0x3971ed50550c43c1ULL, 0x7b810cbbfce67552ULL,
  0xbc902e8706d82ee7ULL, 0xfe60cf6caf321874ULL,
  0xe224479f47cb76a0ULL, 0xa0d4a674ee214033ULL,
  0x67c58448141f1b86ULL, 0x253565a3bdf52d15ULL,
  0xab1721da49899a7fULL, 0xe9e7c031e063acecULL,
  0x2ef6e20d1a5df759ULL, 0x6c0603e6b3b7c1caULL,
  0xf6fae5c07d3274cdULL, 0xb40a042bd4d8425eULL,
  0x731b26172ee619ebULL, 0x31ebc7fc870c2f78ULL,
  0xbfc9838573709812ULL, 0xfd39626eda9aae81ULL,
  0x3a28405220a4f534ULL, 0x78d8a1b9894ec3a7ULL,
  0x649c294a61b7ad73ULL, 0x266cc8a1c85d9be0ULL,
  0xe17dea9d3263c055ULL, 0xa38d0b769b89f6c6ULL,
  0x2daf4f0f6ff541acULL, 0x6f5faee4c61f773fULL,
  0xa84e8cd83c212c8aULL, 0xeabe6d3395cb1a19ULL,
  0x90c79d3fedd3f122ULL, 0xd2377cd44439c7b1ULL,
  0x15265ee8be079c04ULL, 0x57d6bf0317edaa97ULL,
  0xd9f4fb7ae3911dfdULL, 0x9b041a914a7b2b6eULL,
  0x5c1538adb04570dbULL, 0x1ee5d94619af4648ULL,
  0x02a151b5f156289cULL, 0x4051b05e58bc1e0fULL,
  0x87409262a28245baULL, 0xc5b073890b687329ULL,
  0x4b9237f0ff14c443ULL, 0x0962d61b56fef2d0ULL,
  0xce73f427acc0a965ULL, 0x8c8315cc052a9ff6ULL,
  0x3a80143f5cf17f13ULL, 0x7870f5d4f51b4980ULL,
  0xbf61d7e80f251235ULL, 0xfd913603a6cf24a6ULL,
  0x73b3727a52b393ccULL, 0x31439391fb59a55fULL,
  0xf652b1ad0167feeaULL, 0xb4a25046a88dc879ULL,
  0xa8e6d8b54074a6adULL, 0xea16395ee99e903eULL,
  0x2d071b6213a0cb8bULL, 0x6ff7fa89ba4afd18ULL,
  0xe1d5bef04e364a72ULL, 0xa3255f1be7dc7ce1ULL,
  0x64347d271de22754ULL, 0x26c49cccb40811c7ULL,
  0x5cbd6cc0cc10fafcULL, 0x1e4d8d2b65facc6fULL,
  0xd95caf179fc497daULL, 0x9bac4efc362ea149ULL,
  0x158e0a85c2521623ULL, 0x577eeb6e6bb820b0ULL,
  0x906fc95291867b05ULL, 0xd29f28b9386c4d96ULL,
  0xcedba04ad0952342ULL, 0x8c2b41a1797f15d1ULL,
  0x4b3a639d83414e64ULL, 0x09ca82762aab78f7ULL,
  0x87e8c60fded7cf9dULL, 0xc51827e4773df90eULL,
  0x020905d88d03a2bbULL, 0x40f9e43324e99428ULL,
  0x2cffe7d5975e55e2ULL, 0x6e0f063e3eb46371ULL,
  0xa91e2402c48a38c4ULL, 0xebeec5e96d600e57ULL,
  0x65cc8190991cb93dULL, 0x273c607b30f68faeULL,
  0xe02d4247cac8d41bULL, 0xa2dda3ac6322e288ULL,
  0xbe992b5f8bdb8c5cULL, 0xfc69cab42231bacfULL,
  0x3b78e888d80fe17aULL, 0x7988096371e5d7e9ULL,
  0xf7aa4d1a85996083ULL, 0xb55aacf12c735610ULL,
  0x724b8ecdd64d0da5ULL, 0x30bb6f267fa73b36ULL,
  0x4ac29f2a07bfd00dULL, 0x08327ec1ae55e69eULL,
  0xcf235cfd546bbd2bULL, 0x8dd3bd16fd818bb8ULL,
  0x03f1f96f09fd3cd2ULL, 0x41011884a0170a41ULL,
  0x86103ab85a2951f4ULL, 0xc4e0db53f3c36767ULL,
  0xd8a453a01b3a09b3ULL, 0x9a54b24bb2d03f20ULL,
  0x5d45907748ee6495ULL, 0x1fb5719ce1045206ULL,
  0x919735e51578e56cULL, 0xd367d40ebc92d3ffULL,
  0x1476f63246ac884aULL, 0x568617d9ef46bed9ULL,
  0xe085162ab69d5e3cULL, 0xa275f7c11f7768afULL,
  0x6564d5fde549331aULL, 0x279434164ca30589ULL,
  0xa9b6706fb8dfb2e3ULL, 0xeb46918411358470ULL,
  0x2c57b3b8eb0bdfc5ULL, 0x6ea7525342e1e956ULL,
  0x72e3daa0aa188782ULL, 0x30133b4b03f2b111ULL,
  0xf7021977f9cceaa4ULL, 0xb5f2f89c5026dc37ULL,
  0x3bd0bce5a45a6b5dULL, 0x79205d0e0db05dceULL,
  0xbe317f32f78e067bULL, 0xfcc19ed95e6430e8ULL,
  0x86b86ed5267cdbd3ULL, 0xc4488f3e8f96ed40ULL,
  0x0359ad0275a8b6f5ULL, 0x41a94ce9dc428066ULL,
  0xcf8b0890283e370cULL, 0x8d7be97b81d4019fULL,
  0x4a6acb477bea5a2aULL, 0x089a2aacd2006cb9ULL,
  0x14dea25f3af9026dULL, 0x562e43b4931334feULL,
  0x913f6188692d6f4bULL, 0xd3cf8063c0c759d8ULL,
  0x5dedc41a34bbeeb2ULL, 0x1f1d25f19d51d821ULL,
  0xd80c07cd676f8394ULL, 0x9afce626ce85b507ULL,
};

class CRC64 : public CheckSum
{
private:
  off_t crc64offset;
  uint64_t crcsum;
  bool finalized;

public:

  CRC64() : CheckSum("crc64")
  {
    Reset();
  }

  uint64_t crc64(uint64_t crc, const unsigned char *s, uint64_t l) {
    while (l) {
      int i = ((int) (crc >> 56) ^ *s++) & 0xFF;
      crc = crc64_tab[i] ^ (crc << 8);
      l--;
    }
    return crc;
  }



  off_t
  GetLastOffset()
  {
    return crc64offset;
  }

  bool
  Add(const char* buffer, size_t length, off_t offset)
  {
    if (offset != crc64offset) {
      needsRecalculation = true;
      return false;
    }

    crcsum = crc64( crcsum, (unsigned char*) buffer, length);
    crc64offset += length;
    return true;
  }

  const char*
  GetHexChecksum()
  {
    if (!finalized) {
      Finalize();
    }

    char scrc64[1024];
    sprintf(scrc64, "%016lx", crcsum);
    Checksum = scrc64;
    return Checksum.c_str();
  }

  const char*
  GetBinChecksum(int& len)
  {
    if (!finalized) {
      Finalize();
    }

    len = sizeof(unsigned int);
    return (char*) &crcsum;
  }

  int
  GetCheckSumLen()
  {
    return sizeof(unsigned int);
  }

  void
  Reset()
  {
    crcsum = 0;
    crc64offset = 0;
    needsRecalculation = 0;
    finalized = false;
  }

  void
  Finalize()
  {
    if (!finalized) {
      finalized = true;
    }
  }

  virtual
  ~CRC64() { };

};

EOSFSTNAMESPACE_END

#endif