IO/vtkXMLWriter.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkXMLWriter.h,v $
  Language:  C++

  Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm 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 __vtkXMLWriter_h
#define __vtkXMLWriter_h

#include "vtkProcessObject.h"

class vtkCellData;
class vtkDataArray;
class vtkDataCompressor;
class vtkDataSet;
class vtkDataSetAttributes;
class vtkOutputStream;
class vtkPointData;
class vtkPoints;

class VTK_IO_EXPORT vtkXMLWriter : public vtkProcessObject
{
public:
  vtkTypeRevisionMacro(vtkXMLWriter,vtkProcessObject);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  //BTX

  enum { BigEndian, LittleEndian };
  //ETX
  
  //BTX

  enum { Ascii, Binary, Appended };
  //ETX
  
  //BTX

  enum { Int32=32, Int64=64 };
  //ETX
  

  vtkSetMacro(ByteOrder, int);
  vtkGetMacro(ByteOrder, int);
  void SetByteOrderToBigEndian();
  void SetByteOrderToLittleEndian();
  

  virtual void SetIdType(int);
  vtkGetMacro(IdType, int);
  void SetIdTypeToInt32();
  void SetIdTypeToInt64();
  

  vtkSetStringMacro(FileName);
  vtkGetStringMacro(FileName);
  

  virtual void SetCompressor(vtkDataCompressor*);
  vtkGetObjectMacro(Compressor, vtkDataCompressor);
  

  virtual void SetBlockSize(unsigned int blockSize);
  vtkGetMacro(BlockSize, unsigned int);
  

  vtkSetMacro(DataMode, int);
  vtkGetMacro(DataMode, int);
  void SetDataModeToAscii();
  void SetDataModeToBinary();
  void SetDataModeToAppended();
  

  vtkSetMacro(EncodeAppendedData, int);
  vtkGetMacro(EncodeAppendedData, int);
  vtkBooleanMacro(EncodeAppendedData, int);
  
  virtual const char* GetDefaultFileExtension()=0;
  
  virtual int Write();
  
protected:
  vtkXMLWriter();
  ~vtkXMLWriter();
  
  // The name of the output file.
  char* FileName;
  
  // The output stream to which the XML is written.
  ostream* Stream;  
  
  // The output byte order.
  int ByteOrder;
  
  // The output vtkIdType.
  int IdType;
  
  // The form of binary data to write.  Used by subclasses to choose
  // how to write data.
  int DataMode;
  
  // Whether to base64-encode the appended data section.
  int EncodeAppendedData;
  
  // The stream position at which appended data starts.
  unsigned long AppendedDataPosition;

  //BTX
  // We need a 32 bit unsigned integer type for platform-independent
  // binary headers.  Note that this is duplicated in
  // vtkXMLDataParser.h.
#if VTK_SIZEOF_SHORT == 4
  typedef unsigned short HeaderType;
#elif VTK_SIZEOF_INT == 4
  typedef unsigned int HeaderType;
#elif VTK_SIZEOF_LONG == 4
  typedef unsigned long HeaderType;
#else
# error "No native data type can represent an unsigned 32-bit integer."
#endif
  //ETX

  //BTX
  // We need a 32 bit signed integer type to which vtkIdType will be
  // converted if Int32 is specified for the IdType parameter to this
  // writer.
# if VTK_SIZEOF_SHORT == 4
  typedef short Int32IdType;
# elif VTK_SIZEOF_INT == 4
  typedef int Int32IdType;
# elif VTK_SIZEOF_LONG == 4
  typedef long Int32IdType;
# else
#  error "No native data type can represent a signed 32-bit integer."
# endif  
  //ETX
  
  // Buffer for vtkIdType conversion.
  Int32IdType* Int32IdTypeBuffer;
  
  // The byte swapping buffer.
  unsigned char* ByteSwapBuffer;
  
  // Compression information.
  vtkDataCompressor* Compressor;
  unsigned int   BlockSize;  
  unsigned long  CompressionBlockNumber;
  HeaderType*    CompressionHeader;
  unsigned int   CompressionHeaderLength;
  unsigned long  CompressionHeaderPosition;
  
  // The output stream used to write binary and appended data.  May
  // transparently encode the data.
  vtkOutputStream* DataStream;
  
  // Allow subclasses to set the data stream.
  virtual void SetDataStream(vtkOutputStream*);
  vtkGetObjectMacro(DataStream, vtkOutputStream);  
  
  // Method defined by subclasses to write data.  Return 1 for
  // success, 0 for failure.
  virtual int WriteData()=0;
  
  // Method defined by subclasses to specify the data set's type name.
  virtual const char* GetDataSetName()=0;
  
  // Methods to define the file's major and minor version numbers.
  virtual int GetDataSetMajorVersion();
  virtual int GetDataSetMinorVersion();
  
  // Utility methods for subclasses.
  vtkDataSet* GetInputAsDataSet();  
  void StartFile();
  virtual void WriteFileAttributes();
  void EndFile();
  void StartAppendedData();
  void EndAppendedData();
  unsigned long ReserveAttributeSpace(const char* attr=0);
  unsigned long GetAppendedDataOffset();
  unsigned long WriteAppendedDataOffset(unsigned long streamPos,
                                        const char* attr=0);
  int WriteBinaryData(void* data, int numWords, int wordType);
  
  int WriteBinaryData(char* data)
    { return this->WriteBinaryData(data, static_cast<int>(strlen(data)),
                                   VTK_CHAR); }
  int WriteBinaryData(char* data, int numWords)
    { return this->WriteBinaryData(data, numWords, VTK_CHAR); }
  int WriteBinaryData(unsigned char* data, int numWords)
    { return this->WriteBinaryData(data, numWords, VTK_UNSIGNED_CHAR); }
  int WriteBinaryData(short* data, int numWords)
    { return this->WriteBinaryData(data, numWords, VTK_SHORT); }
  int WriteBinaryData(unsigned short* data, int numWords)
    { return this->WriteBinaryData(data, numWords, VTK_UNSIGNED_SHORT); }
  int WriteBinaryData(int* data, int numWords)
    { return this->WriteBinaryData(data, numWords, VTK_INT); }
  int WriteBinaryData(unsigned int* data, int numWords)
    { return this->WriteBinaryData(data, numWords, VTK_UNSIGNED_INT); }
  
  int WriteAsciiData(void* data, int numWords, int wordType, vtkIndent indent);
  
  int WriteAsciiData(char* data, vtkIndent indent)
    { return this->WriteAsciiData(data, static_cast<int>(strlen(data)),
                                  VTK_CHAR, indent); }
  int WriteAsciiData(char* data, int numWords, vtkIndent indent)
    { return this->WriteAsciiData(data, numWords, VTK_CHAR, indent); }
  int WriteAsciiData(unsigned char* data, int numWords, vtkIndent indent)
    { return this->WriteAsciiData(data, numWords, VTK_UNSIGNED_CHAR, indent); }
  int WriteAsciiData(short* data, int numWords, vtkIndent indent)
    { return this->WriteAsciiData(data, numWords, VTK_SHORT, indent); }
  int WriteAsciiData(unsigned short* data, int numWords, vtkIndent indent)
    { return this->WriteAsciiData(data, numWords, VTK_UNSIGNED_SHORT, indent); }
  int WriteAsciiData(int* data, int numWords, vtkIndent indent)
    { return this->WriteAsciiData(data, numWords, VTK_INT, indent); }
  int WriteAsciiData(unsigned int* data, int numWords, vtkIndent indent)
    { return this->WriteAsciiData(data, numWords, VTK_UNSIGNED_INT, indent); }
  
  int WriteScalarAttribute(const char* name, int data);
  int WriteScalarAttribute(const char* name, float data);
#ifdef VTK_ID_TYPE_IS_NOT_BASIC_TYPE
  int WriteScalarAttribute(const char* name, vtkIdType data);
#endif
  
  int WriteVectorAttribute(const char* name, int length, int* data);
  int WriteVectorAttribute(const char* name, int length, float* data);
#ifdef VTK_ID_TYPE_IS_NOT_BASIC_TYPE
  int WriteVectorAttribute(const char* name, int length, vtkIdType* data);
#endif
  
  int WriteDataModeAttribute(const char* name);
  int WriteWordTypeAttribute(const char* name, int dataType);
  int WriteStringAttribute(const char* name, const char* value);
  
  unsigned long WriteDataArrayAppended(vtkDataArray* a, vtkIndent indent,
                                       const char* alternateName=0);
  void WriteDataArrayAppendedData(vtkDataArray* a, unsigned long pos);
  void WriteDataArrayInline(vtkDataArray* a, vtkIndent indent,
                            const char* alternateName=0);
  void WriteInlineData(void* data, int numWords, int wordType,
                       vtkIndent indent);
  
  // Methods for writing points, point data, and cell data.
  void WritePointDataInline(vtkPointData* pd, vtkIndent indent);
  void WriteCellDataInline(vtkCellData* cd, vtkIndent indent);
  unsigned long* WritePointDataAppended(vtkPointData* pd, vtkIndent indent);
  void WritePointDataAppendedData(vtkPointData* pd, unsigned long* pdPositions);
  unsigned long* WriteCellDataAppended(vtkCellData* cd, vtkIndent indent);
  void WriteCellDataAppendedData(vtkCellData* cd, unsigned long* cdPositions);
  void WriteAttributeIndices(vtkDataSetAttributes* dsa, char** names);
  unsigned long WritePointsAppended(vtkPoints* points, vtkIndent indent);
  void WritePointsAppendedData(vtkPoints* points, unsigned long pointsPosition);
  void WritePointsInline(vtkPoints* points, vtkIndent indent);
  void WriteCoordinatesInline(vtkDataArray* xc, vtkDataArray* yc,
                              vtkDataArray* zc, vtkIndent indent);
  unsigned long* WriteCoordinatesAppended(vtkDataArray* xc, vtkDataArray* yc,
                                          vtkDataArray* zc, vtkIndent indent);
  void WriteCoordinatesAppendedData(vtkDataArray* xc, vtkDataArray* yc,
                                    vtkDataArray* zc,
                                    unsigned long* cPositions);
  virtual vtkDataArray* CreateArrayForPoints(vtkDataArray* inArray);
  virtual vtkDataArray* CreateArrayForCells(vtkDataArray* inArray);
  virtual vtkDataArray* CreateExactCoordinates(vtkDataArray* inArray, int xyz);
  void WritePPointData(vtkPointData* pd, vtkIndent indent);
  void WritePCellData(vtkCellData* cd, vtkIndent indent);
  void WritePPoints(vtkPoints* points, vtkIndent indent);
  void WritePDataArray(vtkDataArray* a, vtkIndent indent,
                       const char* alternateName=0);
  void WritePCoordinates(vtkDataArray* xc, vtkDataArray* yc,
                         vtkDataArray* zc, vtkIndent indent);
  
  // Internal utility methods.
  int WriteBinaryDataInternal(void* data, int numWords, int wordType);
  int WriteBinaryDataBlock(unsigned char* in_data, int numWords, int wordType);
  void PerformByteSwap(void* data, int numWords, int wordSize);
  int CreateCompressionHeader(unsigned long size);
  int WriteCompressionBlock(unsigned char* data, unsigned long size);
  int WriteCompressionHeader();
  unsigned long GetWordTypeSize(int dataType);
  const char* GetWordTypeName(int dataType);
  unsigned long GetOutputWordTypeSize(int dataType);
  
  char** CreateStringArray(int numStrings);
  void DestroyStringArray(int numStrings, char** strings);
  virtual int IsSafeToWrite();
  
private:
  vtkXMLWriter(const vtkXMLWriter&);  // Not implemented.
  void operator=(const vtkXMLWriter&);  // Not implemented.
};

#endif

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