gdcmParser.h

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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 GDCMPARSER_H
#define GDCMPARSER_H
 
#include "gdcmTag.h"
#error do not use
#include "gdcmByteBuffer.h"
 
#include <fstream> // std::ifstream
 
namespace gdcm
{
class GDCM_EXPORT Parser /*: private IStream*/
{
public:
  typedef enum {
    NoError,
    NoMemoryError,
    SyntaxError,
    NoElementsError,
    TagMismatchError,
    DuplicateAttributeError,
    JunkAfterDocElementError,
    UndefinedEntityError,
    UnexpectedStateError
  } ErrorType;
 
  Parser() : UserData(0),Buffer(),ErrorCode(NoError) {}
  ~Parser() {}
 
  // Parse some more of the document. The string s is a buffer containing
  // part (or perhaps all) of the document. The number of bytes of s that
  // are part of the document is indicated by len. This means that s
  // doesn't have to be null terminated. It also means that if len is
  // larger than the number of bytes in the block of memory that s points
  // at, then a memory fault is likely. The isFinal parameter informs the
  // parser that this is the last piece of the document. Frequently, the
  // last piece is empty (i.e. len is zero.) If a parse error occurred,
  // it returns 0. Otherwise it returns a non-zero value.
  bool Parse(const char* s, int len, bool isFinal);
 
  // Set handlers for start and end tags. Attributes are passed to the
  // start handler as a pointer to a vector of char pointers. Each
  // attribute seen in a start (or empty) tag occupies 2 consecutive places
  // in this vector: the attribute name followed by the attribute value.
  // These pairs are terminated by a null pointer.
  typedef void (*StartElementHandler) (void *userData,
                                       const Tag &tag,
                                       const char *atts[]);
  typedef void (*EndElementHandler) (void *userData, const Tag &name);
  void SetElementHandler(StartElementHandler start, EndElementHandler end);
 
  // Return what type of error has occurred.
  ErrorType GetErrorCode() const;
 
  // Return a string describing the error corresponding to code.
  // The code should be one of the enums that can be returned from
  // GetErrorCode.
  static const char *GetErrorString(ErrorType const &err);
 
  // Return the byte offset of the position.
  unsigned long GetCurrentByteIndex() const;
 
  // Miscellaneous functions
 
  // The functions in this section either obtain state information from
  // the parser or can be used to dynamically set parser options.
 
  // This sets the user data pointer that gets passed to handlers.
  void SetUserData(void *userData);
 
  // This returns the user data pointer that gets passed to handlers.
  void * GetUserData() const;
 
protected:
 
  // This is just like Parse, except in this case expat provides the buffer.
  // By obtaining the buffer from expat with the GetBuffer function,
  // the application can avoid double copying of the input.
  bool ParseBuffer(int len, bool isFinal);
 
  // Obtain a buffer of size len to read a piece of the document into.
  // A NULL value is returned if expat can't allocate enough memory for
  // this buffer. This has to be called prior to every call to ParseBuffer.
  char *GetBuffer(int len);
 
  ErrorType Process();
 
private:
  std::ifstream Stream;
  void* UserData;
  ByteBuffer Buffer;
  ErrorType ErrorCode;
 
  StartElementHandler StartElement;
  EndElementHandler EndElement;
};
 
} // end namespace gdcm
 
#endif //GDCMPARSER_H