/*
   Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef FS_READWRITEREQ_H
#define FS_READWRITEREQ_H

#include "SignalData.hpp"

/**
 * FsReadWriteReq - Common signal class for FSWRITEREQ and FSREADREQ
 *
 */

/**
 * 
 * SENDER:  
 * RECIVER: Ndbfs
 */
class FsReadWriteReq {
  /**
   * Reciver(s)
   */
  friend class Ndbfs;
  friend class VoidFs;
  friend class AsyncFile;
  friend class PosixAsyncFile; // FIXME
  friend class Win32AsyncFile;

  /**
   * Sender(s)
   */
  friend class Dbdict;
  friend class Lgman;
  friend class Tsman;
  friend class Pgman;
  friend class Restore;
  friend class Dblqh;

  /**
   * For printing
   */
  friend bool printFSREADWRITEREQ(FILE * output, const Uint32 * theData, Uint32 len, Uint16 receiverBlockNo);

public:
  /**
 * Enum type for errorCode
 */
  enum NdbfsFormatType {
    fsFormatListOfPairs=0,
    fsFormatArrayOfPages=1,
    fsFormatListOfMemPages=2,
    fsFormatGlobalPage=3,
    fsFormatSharedPage=4,
    fsFormatMax
  };
  
  /**
   * Length of signal
   */
  STATIC_CONST( FixedLength = 6 );

private:

  /**
   * DATA VARIABLES
   */
  UintR filePointer;          // DATA 0
  UintR userReference;        // DATA 1
  UintR userPointer;          // DATA 2
  UintR operationFlag;        // DATA 3
  UintR varIndex;             // DATA 4
  UintR numberOfPages;        // DATA 5  

//-------------------------------------------------------------
// Variable sized part. Those will contain 
// info about memory/file pages to read/write
//-------------------------------------------------------------  
  union {
    UintR pageData[16];        // DATA 6 - 21
    struct {
      Uint32 varIndex;   // In unit cluster size
      Uint32 fileOffset; // In unit page size
    } listOfPair[8];
    struct {
      Uint32 varIndex;
      Uint32 fileOffset;
    } arrayOfPages;
    struct {
      Uint32 varIndex[1]; // Size = numberOfPages
      Uint32 fileOffset;
    } listOfMemPages;
  } data;

  static Uint8 getSyncFlag(const UintR & opFlag);
  static void setSyncFlag(UintR & opFlag, Uint8 flag);

  static NdbfsFormatType getFormatFlag(const UintR & opFlag);
  static void setFormatFlag(UintR & opFlag, Uint8 flag);

  static Uint32 getPartialReadFlag(UintR opFlag);
  static void setPartialReadFlag(UintR & opFlag, Uint32 flag);
};

/**
 * Operation flag
 *
 f = Format of pageData       -  4 Bits -> max 15
 s = sync after write flag    -  1 Bit

           1111111111222222222233
 01234567890123456789012345678901
 ffffs
*/

#define SYNC_SHIFT (4)
#define SYNC_MASK  (0x01)

#define FORMAT_MASK (0x0F)

#define PARTIAL_READ_SHIFT (5)

inline
Uint8
FsReadWriteReq::getSyncFlag(const UintR & opFlag){
  return (Uint8)((opFlag >> SYNC_SHIFT) & SYNC_MASK);
}

inline
FsReadWriteReq::NdbfsFormatType
FsReadWriteReq::getFormatFlag(const UintR & opFlag){
  return (NdbfsFormatType)(opFlag & FORMAT_MASK);
}

inline
void 
FsReadWriteReq::setSyncFlag(UintR & opFlag, Uint8 flag){
  ASSERT_BOOL(flag, "FsReadWriteReq::setSyncFlag");
  opFlag |= (flag << SYNC_SHIFT);
}

inline
void 
FsReadWriteReq::setFormatFlag(UintR & opFlag, Uint8 flag){
  ASSERT_MAX(flag, fsFormatMax, "FsReadWriteReq::setSyncFlag");
  opFlag |= flag;
}

inline
void 
FsReadWriteReq::setPartialReadFlag(UintR & opFlag, Uint32 flag){
  ASSERT_BOOL(flag, "FsReadWriteReq::setSyncFlag");
  opFlag |= (flag << PARTIAL_READ_SHIFT);
}

inline
Uint32
FsReadWriteReq::getPartialReadFlag(UintR opFlag){
  return (opFlag >> PARTIAL_READ_SHIFT) & 1;
}

struct FsSuspendOrd
{
  UintR filePointer;          // DATA 0
  Uint32 milliseconds;

  STATIC_CONST(SignalLength = 2);
};

#endif
