ls-hdf5.h

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//
// Copyright (C) 2003-2023 The Octave Project Developers
//
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#if ! defined (octave_ls_hdf5_h)
#define octave_ls_hdf5_h 1
 
#include "octave-config.h"
 
#include <iosfwd>
 
#include "oct-hdf5-types.h"
#include "ov.h"
 
// first, we need to define our own dummy stream subclass, since
// HDF5 needs to do its own file i/o
 
// hdf5_fstreambase is used for both input and output streams, modeled
// on the fstreambase class in <fstream.h>
 
class hdf5_fstreambase : virtual public std::ios
{
public:
 
  // HDF5 uses an "id" to refer to an open file
  octave_hdf5_id file_id;
 
  // keep track of current item index in the file
  int current_item;
 
  hdf5_fstreambase () : file_id (-1), current_item () { }
 
  ~hdf5_fstreambase () { close (); }
 
  OCTINTERP_API hdf5_fstreambase (const char *name, int mode,
                                  int /* prot */ = 0);
 
  OCTINTERP_API void close (void);
 
  OCTINTERP_API void open (const char *name, int mode, int);
 
  OCTINTERP_API void open_create (const char *name, int mode);
};
 
// input and output streams, subclassing istream and ostream
// so that we can pass them for stream parameters in the functions below.
 
class hdf5_ifstream : public hdf5_fstreambase, public std::istream
{
public:
 
  hdf5_ifstream () : hdf5_fstreambase (), std::istream (nullptr) { }
 
  hdf5_ifstream (const char *name, int mode = std::ios::in | std::ios::binary,
                 int prot = 0)
    : hdf5_fstreambase (name, mode, prot), std::istream (nullptr) { }
 
  void open (const char *name, int mode = std::ios::in | std::ios::binary,
             int prot = 0)
  { hdf5_fstreambase::open (name, mode, prot); }
};
 
class hdf5_ofstream : public hdf5_fstreambase, public std::ostream
{
public:
 
  hdf5_ofstream () : hdf5_fstreambase (), std::ostream (nullptr) { }
 
  hdf5_ofstream (const char *name, int mode = std::ios::out | std::ios::binary,
                 int prot = 0)
    : hdf5_fstreambase (name, mode, prot), std::ostream (nullptr) { }
 
  void open (const char *name, int mode = std::ios::out | std::ios::binary,
             int prot = 0)
  { hdf5_fstreambase::open (name, mode, prot); }
};
 
// Callback data structure for passing data to hdf5_read_next_data, below.
 
struct hdf5_callback_data
{
public:
  hdf5_callback_data (void)
    : name (), global (false), tc (), doc () { }
 
  // the following fields are set by hdf5_read_data on successful return:
 
  // the name of the variable
  std::string name;
 
  // whether it is global
  bool global;
 
  // the value of the variable, in Octave form
  octave_value tc;
 
  // a documentation string (NULL if none)
  std::string doc;
};
 
extern OCTINTERP_API octave_hdf5_id
save_type_to_hdf5 (save_type st);
 
extern OCTINTERP_API octave_hdf5_id
hdf5_make_complex_type (octave_hdf5_id num_type);
 
extern OCTINTERP_API bool
hdf5_types_compatible (octave_hdf5_id t1, octave_hdf5_id t2);
 
extern OCTINTERP_API octave_hdf5_err
hdf5_read_next_data (octave_hdf5_id group_id, const char *name, void *dv);
 
extern OCTINTERP_API octave_hdf5_err
hdf5_h5g_iterate (octave_hdf5_id loc_id, const char *name, int *idx,
                  void *operator_data);
 
extern OCTINTERP_API bool
add_hdf5_data (octave_hdf5_id loc_id, const octave_value& tc,
               const std::string& name, const std::string& doc,
               bool mark_global, bool save_as_floats);
 
extern OCTINTERP_API int
save_hdf5_empty (octave_hdf5_id loc_id, const char *name, const dim_vector& d);
 
extern OCTINTERP_API int
load_hdf5_empty (octave_hdf5_id loc_id, const char *name, dim_vector& d);
 
extern OCTINTERP_API std::string
read_hdf5_data (std::istream& is,  const std::string& filename, bool& global,
                octave_value& tc, std::string& doc,
                const string_vector& argv, int argv_idx, int argc);
 
extern OCTINTERP_API bool
save_hdf5_data (std::ostream& os, const octave_value& tc,
                const std::string& name, const std::string& doc,
                bool mark_global, bool save_as_floats);
 
extern OCTINTERP_API bool
hdf5_check_attr (octave_hdf5_id loc_id, const char *attr_name);
 
extern OCTINTERP_API bool
hdf5_get_scalar_attr (octave_hdf5_id loc_id, octave_hdf5_id type_id,
                      const char *attr_name, void *buf);
 
extern OCTINTERP_API octave_hdf5_err
hdf5_add_attr (octave_hdf5_id loc_id, const char *attr_name);
 
 
extern OCTINTERP_API octave_hdf5_err
hdf5_add_scalar_attr (octave_hdf5_id loc_id, octave_hdf5_id type_id,
                      const char *attr_name, void *buf);
 
#endif