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/*=========================================================================

  Program: GDCM (Grassroots DICOM). A DICOM library

  Copyright (c) 2006-2011 Mathieu Malaterre
  All rights reserved.
  See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef GDCMVM_H
#define GDCMVM_H

#include "gdcmTypes.h"
#include <iostream>

namespace gdcm
{

/**
 * \brief Value Multiplicity
 * Looking at the DICOMV3 dict only there is very few cases:
 * 1
 * 2
 * 3
 * 4
 * 5
 * 6
 * 8
 * 16
 * 24
 * 1-2
 * 1-3
 * 1-8
 * 1-32
 * 1-99
 * 1-n
 * 2-2n
 * 2-n
 * 3-3n
 * 3-n
 *
 * Some private dict define some more:
 * 4-4n
 * 1-4
 * 1-5
 * 256
 * 9
 * 3-4
 *
 * even more:
 *
 * 7-7n
 * 10
 * 18
 * 12
 * 35
 * 47_47n
 * 30_30n
 * 28
 *
 * 6-6n
 */
class GDCM_EXPORT VM
{
public:
  typedef enum {
    VM0 = 0, // aka the invalid VM
    VM1 = 1,
    VM2 = 2,
    VM3 = 4,
    VM4 = 8,
    VM5 = 16,
    VM6 = 32,
    VM8 = 64,
    VM9 = 128,
    VM10 = 256,
    VM12 = 512, //1024,
    VM16 = 1024, //2048,
    VM18 = 2048, //4096,
    VM24 = 4096, //8192,
    VM28 = 8192, //16384,
    VM32 = 16384, //32768,
    VM35 = 32768, //65536,
    VM99 = 65536, //131072,
    VM256 = 131072, //262144,
    VM1_2  = VM1 | VM2,
    VM1_3  = VM1 | VM2 | VM3,
    VM1_4  = VM1 | VM2 | VM3 | VM4,
    VM1_5  = VM1 | VM2 | VM3 | VM4 | VM5,
    VM1_8  = VM1 | VM2 | VM3 | VM4 | VM5 | VM6 | VM8,
// The following need some work:
    VM1_32 = VM1 | VM2 | VM3 | VM4 | VM5 | VM6 | VM8 | VM9 | VM16 | VM24 | VM32,
    VM1_99 = VM1 | VM2 | VM3 | VM4 | VM5 | VM6 | VM8 | VM9 | VM16 | VM24 | VM32 | VM99,
    VM1_n  = VM1 | VM2 | VM3 | VM4 | VM5 | VM6 | VM8 | VM9 | VM16 | VM24 | VM32 | VM99 | VM256,
    VM2_2n =       VM2       | VM4       | VM6 | VM8       | VM16 | VM24 | VM32        | VM256,
    VM2_n  =       VM2 | VM3 | VM4 | VM5 | VM6 | VM8 | VM9 | VM16 | VM24 | VM32 | VM99 | VM256,
    VM3_4  =             VM3 | VM4,
    VM3_3n =             VM3 |             VM6       | VM9        | VM24        | VM99 | VM256,
    VM3_n  =             VM3 | VM4 | VM5 | VM6 | VM8 | VM9 | VM16 | VM24 | VM32 | VM99 | VM256,
    VM4_4n =                   VM4                         | VM16 | VM24 | VM32        | VM256,
    VM6_6n =                               VM6             | VM12 | VM18 | VM24               ,
    VM6_n  =                               VM6 | VM8 | VM9 | VM16 | VM24 | VM32 | VM99 | VM256,
    VM7_7n,
    VM30_30n,
    VM47_47n,
    VM_END = VM1_n + 1  // Custom tag to count number of entry
  } VMType;

  /// Return the string as written in the official DICOM dict from
  /// a custom enum type
  static const char* GetVMString(VMType vm);
  static VMType GetVMType(const char *vm);

  /// Check if vm1 is valid compare to vm2, i.e vm1 is element of vm2
  /// vm1 is typically deduce from counting in a ValueField
  static bool IsValid(int vm1, VMType vm2);
  //bool IsValid() { return VMField != VM0 && VMField < VM_END; }

  /// WARNING: Implementation deficiency
  /// The Compatible function is poorly implemented, the reference vm should be coming from
  /// the dictionary, while the passed in value is the value guess from the file.
  bool Compatible(VM const &vm) const;

  ///
  static VMType GetVMTypeFromLength(size_t length, unsigned int size);
  static size_t GetNumberOfElementsFromArray(const char *array, size_t length);

  VM(VMType type = VM0):VMField(type) {}
  operator VMType () const { return VMField; }
  unsigned int GetLength() const;

  friend std::ostream &operator<<(std::ostream &os, const VM &vm);
protected:
  static unsigned int GetIndex(VMType vm);

private:
  VMType VMField;
};
//-----------------------------------------------------------------------------
inline std::ostream& operator<<(std::ostream& _os, const VM &_val)
{
  assert( VM::GetVMString(_val) );
  _os << VM::GetVMString(_val);
  return _os;
}

//template <int TVM> struct LengthToVM;
//template <> struct LengthToVM<1>
//{ enum { TVM = VM::VM1 }; };

template<int T> struct VMToLength;
#define TYPETOLENGTH(type,length) \
  template<> struct VMToLength<VM::type> \
  { enum { Length = length }; };
// TODO: Could be generated from XML file
//TYPETOLENGTH(VM0,1)
TYPETOLENGTH(VM1,1)
TYPETOLENGTH(VM2,2)
TYPETOLENGTH(VM3,3)
TYPETOLENGTH(VM4,4)
TYPETOLENGTH(VM5,5)
TYPETOLENGTH(VM6,6)
TYPETOLENGTH(VM8,8)
TYPETOLENGTH(VM9,9)
TYPETOLENGTH(VM10,10)
TYPETOLENGTH(VM12,12)
TYPETOLENGTH(VM16,16)
TYPETOLENGTH(VM18,18)
TYPETOLENGTH(VM24,24)
TYPETOLENGTH(VM28,28)
TYPETOLENGTH(VM32,32)
TYPETOLENGTH(VM35,35)
TYPETOLENGTH(VM99,99)
TYPETOLENGTH(VM256,256)
//TYPETOLENGTH(VM1_2,2)
//TYPETOLENGTH(VM1_3,3)
//TYPETOLENGTH(VM1_8,8)
//TYPETOLENGTH(VM1_32,32)
//TYPETOLENGTH(VM1_99,99)
//TYPETOLENGTH(VM1_n,
//TYPETOLENGTH(VM2_2n,
//TYPETOLENGTH(VM2_n,
//TYPETOLENGTH(VM3_3n,
//TYPETOLENGTH(VM3_n,

} // end namespace gdcm

#endif //GDCMVM_H