#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <hdf.h>
#include "H5IO.hh"
#include <hdf5.h>

hid_t H5IO::DataType2H5(IObase::DataType nt){
  switch(nt){
  case Int8:
    return H5T_NATIVE_CHAR; // means data
  case Char8:  // distinct from INT8..
  	return H5T_NATIVE_CHAR; // means string
  case Float32:
    return H5T_NATIVE_FLOAT;
  case Float64:
    return H5T_NATIVE_DOUBLE;
  case Int32:
    return H5T_NATIVE_INT;
  case Int64:
    return H5T_NATIVE_LLONG;
  case Int16:
    return H5T_NATIVE_SHORT;
  case uInt8:
    return H5T_NATIVE_UCHAR;
  case uInt16:
    return H5T_NATIVE_USHORT;
  case uInt32:
    return H5T_NATIVE_UINT;
  case uInt64:
    return H5T_NATIVE_ULLONG;
  case Char16: // unicode character type
  	return H5T_NATIVE_USHORT;
  default:
  printf("H5IO::H52DataType(): Don't recognize type %d\n",(int)nt);
  return -1;
  }
}

IObase::DataType H5IO::H5DataType2DataType(hid_t nt){
  H5T_class_t typeclass;
  size_t typesize;

  typeclass = H5Tget_class(nt);
  typesize  = H5Tget_size(nt);
  //fprintf(stderr,"class=%d size=%d\n",typeclass,typesize);

  switch(typeclass){
  case H5T_INTEGER:
    // printf("Int %d bytes\n",typesize);
    switch(typesize){
    case 1:
      return Int8;
    case 2:
      return Int16;
    case 4:
      return Int32;
    case 8:
      return Int64;
    default:
      printf("Cannot convert type for integer with %d bytes\n",
	     typesize);
      break;
    }
    break;
  case H5T_FLOAT:
    //  printf("Float %d bytes\n",typesize);
    switch(typesize){
    case 4:
      return Float32;
    case 8:
      return Float64;
    default:
      printf("Cannot convert type for floating point with %d bytes\n",
	     typesize);
    }
    break;
  case H5T_TIME:
    puts("Cannot convert type Time");
    break;
  case H5T_STRING:
    return Char8;
    //puts("String");
    //switch(typesize){
    //case 1:
    //  return Char8;
    //case 2:
    //  return Char16;
    //default:
    //  printf("Cannot convert type for string element with %d bytes\n",
    //     typesize);
    //  break;
    //}
    break;
  case H5T_BITFIELD:
    puts("Cannot convert type Bitfield");
    break;
  case H5T_OPAQUE:
    puts("Cannot convert type Opaque");
    break;
  case H5T_COMPOUND:
  default:
    puts("Cannot convert type Unknown");
    break;
  }
  puts("Type conversion failed");
  return Error;
}
#if 0
IObase::DataType H5IO::H52DataType(hid_t &nt){
  switch(nt){
  case H5T_NATIVE_CHAR:
  	return Int8;
  case H5T_NATIVE_CHAR:
    return Char8;
  case H5T_NATIVE_FLOAT:
    return Float32;
  case H5T_NATIVE_DOUBLE:
    return Float64;
  case H5T_NATIVE_INT:
    return Int32;
  case H5T_NATIVE_LONGLONG:
    return Int64;
  case H5T_NATIVE_SHORT:
    return Int16;
  case H5T_NATIVE_UCHAR:
    return uInt8;
  case H5T_NATIVE_USHORT:
    return uInt16;
  case H5T_NATIVE_UINT:
    return uInt32;
  case H5T_NATIVE_ULONGLONG:
    return uInt64;
    // no translation to Char16 from HDF5 right now (unclear what to do)
  }
  fprintf(stderr,"H5IO::H52DataType(): Don't recognize type %d\n",(int)nt);
  return Error;
}
#endif
int H5IO::createdataspace(int rank,CONST int *dims){
  if(dataspacevalid && rankf==(hsize_t) rank){
    // lets compare dims
    int val=1;
    for(int i=0;i<rank;i++) if((hsize_t) dims[i]!=dimsf[rank-i-1]) val=0;
    if(val){        // current dataspace is sufficient
      nitems++;
      index=nitems-1; // error in returnval here!
      return 1; // success
    }
    // otherwise, must nuke current dataspace
    enddataspace();
  }
  for(int i=0;i<rank;i++) dimsf[rank-i-1]=dims[i];
  rankf=rank;
  dataspace = H5Screate_simple(rankf, dimsf, NULL);
  dataspacevalid=1;
  nitems++;
  index=nitems-1;
  return 1; // created new datapace
}

int H5IO::createdatatype(IObase::DataType dt){
  if(currentdatatype==dt) return 0;
  enddatatype();
  datatype = H5Tcopy(DataType2H5(dt));
  currentdatatype = dt;
  datatypevalid = 1;
  return 1;
}

int H5IO::selectdataset(int i){
  // printf("datasetvalid=%u i=%d index=%d nitems=%d\n",datasetvalid,i,index,nitems);

  if(index==i && datasetvalid)
    return index;
  index=i;
  if(index>=nitems) index=nitems-1;
  if(index<0) index=0;
  // must iterate to select or for now just
  char dataname[128];
  //char dataname2[128];
  //sprintf(dataname,"H5IO-Dataset%09u",index); // was a KLUDGE!
  getdatasetname(index,dataname);
  //fprintf(stderr,"Datasetname for dataset[%u]=[%s] [%s]\n",index,dataname,dataname2);
  enddataset(); // close current dataset
  dataset = H5Dopen(file,dataname); // open a dataset
  if(!dataset) puts("error no dataset");
  datasetvalid=1; // we have a new dataset
  // if(!datasetvalid) return -1;
  enddataspace();
  dataspace = H5Dget_space(dataset);
  if(!dataspace) puts("error no dataspace");
  enddatatype();
  datatype = H5Dget_type(dataset);
  enddataspace();
  rankf = H5Sget_simple_extent_ndims(dataspace);
  H5Sget_simple_extent_dims(dataspace,dimsf,NULL);
  //printf("\tdimsf is now %lu:%lu:%lu\n",dimsf[0],dimsf[1],dimsf[2]);
  datasetvalid=dataspacevalid=datatypevalid=1; // all valid now
  return index;
}

herr_t H5IOcounter(hid_t group_id,
	       const char *member_name,
		      void *operator_data){
  int *count = (int*)operator_data;
  /* typedef struct H5G_stat_t {
    unsigned long fileno[2];
    unsigned long objno[2];
    unsigned nlink;
    int type;
    time_t mtime;
    size_t linklen;
    } H5G_stat_t */
  H5G_stat_t objinfo;
  // request info about the type of objects in root group
  if(H5Gget_objinfo(group_id,
		 member_name,
		 1 /* follow links */,
		    &objinfo)<0) {
    //fprintf(stderr,"\tcounter: Bad Info [%s] count=%u\n",member_name,*count);
    return 0; // error (probably bad symlink)
  }
  // only count objects that are datasets (not subgroups)
  if(objinfo.type==H5G_DATASET){
    // fprintf(stderr,"\tcounter: This is a dataset [%s] count=%u\n",member_name,*count);
    (*count)++;
  }
  //else
    // fprintf(stderr,"\tcounter: **reject dataset [%s] count=%u\n",member_name,*count);
  return 0;
}

struct H5IO_getname_t {
  int index,count;
  char *name;
};
herr_t H5IOgetname(hid_t group_id,
			  const char *member_name,
			  void *operator_data){
  H5IO_getname_t *getn = (H5IO_getname_t*)operator_data;
  // check type first (only respond if it is a dataset)
  H5G_stat_t objinfo;
  // request info about the type of objects in root group
  if(H5Gget_objinfo(group_id,
		    member_name,
		    1 /* follow links */,
		    &objinfo)<0) return 0; // error (probably bad symlink)
  // only count objects that are datasets (not subgroups)
  if(objinfo.type!=H5G_DATASET)
    return 0; // do not increment count if it isn't a dataset.
  if(getn->index==getn->count){
    strcpy(getn->name,member_name);
    return 1; // success
  }
  getn->count++;
  return 0;
}

int H5IO::getndatasets(){
  int count=0;
  int idx=0;
  while(H5Giterate(file, /* hid_t loc_id, */
		   "/", /*const char *name, */
		   &idx, /* int *idx, */
		   H5IOcounter,
		   &count)<0){}
  //if(nitems!=count){
    //printf("getndatasets: nitems{%d}!=count{%d}\n",
    //	   nitems,count);
  //}
  //fprintf(stderr,"getndatasets:=%u\n",count);
  nitems = count; // just for internal bookkeeping
  return count;
}

void H5IO::getdatasetname(int _index, // in
			 char *name){ // out
  H5IO_getname_t getn;
  int idx=_index;
  getn.index=_index; getn.name=name; getn.count=_index;
  while(H5Giterate(file, /* hid_t loc_id, */
		   "/", /*const char *name, */
		   &idx, /* int *idx, */
		   H5IOgetname,
		   &getn)<0){}
}

void H5IO::enddataspace(){
  if(!dataspacevalid) return;
  dataspacevalid=0;
  for(int i=0;(hsize_t) i<rankf;i++) dimsf[i]=0;
  rankf=0;
  H5Sclose(dataspace);
}
void H5IO::enddatatype(){
  if(!datatypevalid) return;
  datatypevalid=0;
  currentdatatype = IObase::Error;
  H5Tclose(datatype);
}

// This is broken: It must create a different name for each dataset
// for the purpose of indexing.  So the "name" as it is passed here
// should actually be an attribute of the dataset which is tacked on
// right here.
int H5IO::createdataset(char *name,IObase::DataType nt,int rank,CONST int *dims){
  //printf("++createdataset index=%u\n",index);
  createdataspace(rank,dims);
  createdatatype(nt);
  //printf("+++createdataset index=%u\n",index);
  // dump the old one and create a new one
  dataset = H5Dcreate(file, name, datatype, dataspace,
		      H5P_DEFAULT);
  datasetvalid=1;
  return 1;
}

int H5IO::createdataset(IObase::DataType nt,int rank,CONST int *dims){
  //printf("++createdataset index=%u\n",index);
  createdataspace(rank,dims);
  createdatatype(nt);
  //printf("+++createdataset index=%u\n",index);
  // dump the old one and create a new one
  char buffer[128];
  sprintf(buffer,"H5IO-Dataset%09u",index); // current index in file
  //printf("Creating dataset [%s]\n",buffer);
  dataset = H5Dcreate(file,buffer, datatype, dataspace,
		      H5P_DEFAULT);
  datasetvalid=1;
  return 1;
}

int H5IO::getdatasetinfo(int &rank, int *dims, IObase::DataType &nt){
  if(!datasetvalid) return 0;
  rank = rankf;
  //printf("getdatasetinfo: Rankf = %u dimsf= %u %u %u\n",
  // (int)rankf,(int)dimsf[0],(int)dimsf[1],(int)dimsf[2]);
  for(int i=0;i<rank;i++){
    dims[rank-1-i]=dimsf[i];
    //printf("[%u] %u:%u ",i,dims[i],dimsf[i]);
  }
  //puts("<---were copied dims");
  nt = H5DataType2DataType(datatype);
  return 1;
}

void H5IO::enddataset(){
  if(!datasetvalid) return;
  H5Dclose(dataset);
  datasetvalid=0;
}

H5IO::H5IO(CONST char *fname,AccessMode access):IObase(fname,access),filevalid(0),datasetvalid(0),datatypevalid(0),dataspacevalid(0),hasread(0){
  nitems = 0;
  switch(accessmode){
  case Read:
    file=H5Fopen(fname, H5F_ACC_RDONLY, H5P_DEFAULT);
    if (file >= 0) nitems = getndatasets();
    break;
  case Write:
    file=H5Fcreate(fname, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
    break;
  case Append:
    file=H5Fopen(fname, H5F_ACC_RDWR, H5P_DEFAULT);
    if (file >= 0) nitems = getndatasets();
    break;
  default:
    file = -1;
    puts("H5IO: constructor... invalid accessmode");
    break;
  }
  filevalid = file >= 0;
}

H5IO::~H5IO(){
  // printf("Destroying H5 file fid=%u, sid=%u\n",fid,sid);
  enddataset(); // close all dataset and datatype IDs which are open
  enddatatype();
  enddataspace();
  if(file>=0) H5Fclose(file);
  filevalid=0;
}

int H5IO::isValid() { return filevalid; }

int H5IO::write(IObase::DataType typeID,int rank,CONST int *dims,const void *data){
  hasread=0;
  //printf("++Write index=%u\n",index);
  createdataset(typeID,rank,dims);
  status = H5Dwrite(dataset, DataType2H5(typeID), H5S_ALL, H5S_ALL,
                      H5P_DEFAULT, data);
  enddataset(); // commit it now
  return status;
}

//int H5IO::write(char *name, IObase::DataType typeID,int rank,CONST int *dims,void *data){
//  hasread=0;
//  createdataset(name,typeID,rank,dims);
//  return status = H5Dwrite(dataset, DataType2H5(typeID), H5S_ALL, H5S_ALL,
//                      H5P_DEFAULT, data);
//}

int H5IO::readInfo(char *name,IObase::DataType &typeID,int &rank,int *dims,int maxdims){

  // name shouls be attribute "long_name");
  if(hasread){
    //printf("hasread=1, so get next dataset index %u\n",index+1);
    hasread=0;
    selectdataset(index+1);
  }
  else {
    //printf("hasread=0, so select current index for dataset %u\n",index);
    selectdataset((int)index);
  }
  getdatasetinfo(rank,dims,typeID);
  //sprintf(name,"H5IO-Dataset%09u",index);
  getdatasetname(index,name);
  hasread=1;
  return 1;
}

int H5IO::readInfo(IObase::DataType &typeID,int &rank,int *dims,int maxdims){
  // name is an attribute "long_name");
  if(hasread){
    hasread=0;
    selectdataset(index+1);
  }
  else {
    selectdataset((int)index);
  }
  getdatasetinfo(rank,dims,typeID);
  hasread=1;
  return 1;
}

int H5IO::read(void *data){
  selectdataset(index); // make certain its selected
  // we will be getting all of the dataset
  //SDgetinfo(sid,name,&rank,dims,&nt,&natt);
  // set up memspace
  hid_t memspace = H5Screate_simple(rankf,dimsf,NULL);
  //printf("rankf=%u dimsf=%u:%u:%u\n",(int)rankf,
  //	 (int)dimsf[0],(int)dimsf[1],(int)dimsf[2]);
  // printf("Data = %u\n",data);
  // if(!memspace) puts("no memspace");
  //if(!dataset) puts("no dataset");
  status = H5Dread(dataset,DataType2H5(H5DataType2DataType(datatype)),
		   memspace,dataspace,H5P_DEFAULT,data);
  // printf("H5Dread status = %d\n",status);
  hasread=1;
  return status;
}

int H5IO::seek(int i) { selectdataset((int)i); hasread=0; return index; }

int H5IO::nDatasets(){ // not completely correct due to coordvar's
  // must scan for coordvar's and eliminate them from the count.
  // int32 ndatasets,nattribs;
  //SDfileinfo(fid,&ndatasets,&nattribs);
  // return (int)ndatasets; //?
  return getndatasets();
}

int H5IO::writeAnnotation(CONST char *annotation){
#if 0
  select((int)index); // select if not already selected
  int32 ref=SDidtoref(sid);
  return (int)DFANputlabel(filename,DFTAG_NDG,ref,(char*)annotation);
#endif
  return 1;
}

int H5IO::readAnnotationInfo(int number,int &length){
#if 0
  select(index);
  int32 ref=SDidtoref(sid);
  length=(int)DFANgetlablen(filename,DFTAG_NDG,ref);
  return length;
#endif
  //  sprintf(annotation,"not-implemented");
  length=0;
  return 0;
}

int H5IO::readAnnotation(int number,char *annotation,int maxlen){
#if 0
  // number=0; // How do I get the number of annotations availible?
  // use get lablist to get list of tags
  number=0; // number is ALWAYS 0 for hdf files
  select(index);
  int32 ref=SDidtoref(sid);
  return (int)DFANgetlabel(filename,DFTAG_NDG,ref,annotation,maxlen);
#endif
  if(maxlen>30)
    sprintf(annotation,"not-implemented");
  else if(annotation)
    *annotation=0;
  return 1;
}


int H5IO::nAnnotations(){
#if 0
  select(index);
  int32 ref=SDidtoref(sid);
  if(DFANgetlablen(filename,DFTAG_NDG,ref)<=0) return 0; // no labels found
  return 1; // always 1 annotation per object limit for H5 is appears
#endif
  return 0;
}

int H5IO::writeAttribute(CONST char *name,IObase::DataType typeID,Long length,const void *data){
  //printf("writeAttrib index=%u\n",index);
  selectdataset(index); // make sure it is selected
  //printf("\tindex=%u\n",index);
  // create a datashape
  hid_t datatype = DataType2H5(typeID);
  int is_string = datatype == H5T_NATIVE_CHAR;
  if (is_string)
  {
    datatype = H5Tcopy (H5T_C_S1);
    // we want the string length (without the trailing '\0')
    H5Tset_size (datatype, length - 1);
    length = 1;
  }
  hsize_t dimsa = length;
  hid_t shape = dimsa > 1 ? H5Screate_simple (1, &dimsa, NULL) :
                            H5Screate (H5S_SCALAR);
  hid_t attrib = H5Acreate(dataset,name,datatype,shape,H5P_DEFAULT);
  H5Awrite(attrib, datatype, data);
  H5Aclose(attrib);
  H5Sclose(shape);
  if (is_string)
  {
    H5Tclose (datatype);
  }
  return 1;
}

int H5IO::readAttributeInfo(int number,char *name,IObase::DataType &typeID,Long &nelem,int maxnamelen){
  selectdataset(index); // make sure current dataset is selected
  hid_t attrib = H5Aopen_idx(dataset,number);
  hid_t atype = H5Aget_type(attrib);
  hid_t ashape = H5Aget_space(attrib);
  H5Aget_name(attrib,maxnamelen,name);
  // rank should always be 0 for scalars and 1 for arrays;
  hsize_t arank = H5Sget_simple_extent_ndims(ashape);
  hsize_t adims;
  if ((arank != 0 && arank != 1) ||
      H5Sget_simple_extent_dims (ashape, &adims, NULL) < 0)
  {
    return (0);
  }
  typeID = H5DataType2DataType(atype);
  nelem = arank ? adims : 1; // single-dimensional array for attributes
  if (H5Tget_class (atype) == H5T_STRING)
  { 
    nelem = H5Tget_size(atype);
  }

  H5Tclose(atype);
  H5Sclose(ashape);
  H5Aclose(attrib);
  return 1;
}

struct H5IOatt_name2index_t {
  char *name;
  int count;
};
herr_t H5IOattr_name2index(hid_t group_id,
			   const char *member_name,
			   void *operator_data){
  H5IOatt_name2index_t *s=(H5IOatt_name2index_t*)operator_data;
  s->count++;
  if(!strcmp(member_name,s->name))
    return s->count;
  else{
    return 0;
  }
}

herr_t H5IOattr_count(hid_t group_id,
			   const char *member_name,
			   void *operator_data){
  // cycle through all attribs as a dummy counter
  int *count = (int *)operator_data;
  (*count)++;
  return 0;
}

int H5IO::readAttributeInfo(CONST char *name,IObase::DataType &typeID,Long &nelem){
  selectdataset(index); // make sure current dataset is selected
  H5IOatt_name2index_t stype;
  stype.name=(char*)name;
  stype.count=0;
  unsigned idx=0;
  int aindex = H5Aiterate(dataset,&idx,H5IOattr_name2index,&stype);
  if(aindex<=0) return -1;
  aindex--; // index is one more than the actual index of the item
  hid_t attrib = H5Aopen_name(dataset,name);
  hid_t atype = H5Aget_type(attrib);
  hid_t ashape = H5Aget_space(attrib);
  // rank should always be 0 for scalars and 1 for arrays;
  hsize_t arank = H5Sget_simple_extent_ndims(ashape);
  hsize_t adims;
  if ((arank != 0 && arank != 1) ||
      H5Sget_simple_extent_dims (ashape, &adims, NULL) < 0)
  {
    return (0);
  }
  typeID = H5DataType2DataType(atype);
  nelem = arank ? adims : 1; // single-dimensional array for attributes
  if (H5Tget_class (atype) == H5T_STRING)
  {
    nelem = H5Tget_size(atype);
  }

  H5Tclose(atype);
  H5Sclose(ashape);
  H5Aclose(attrib);
  return aindex;
}

int H5IO::readAttribute(int number,void *data){
  // now must openIDX again
  selectdataset(index); // just to be sure we've got data
  hid_t attrib = H5Aopen_idx(dataset,number);
  hid_t atype = H5Aget_type(attrib);
  H5Aread(attrib,atype /*DataType2H5(H5DataType2DataType(atype))*/ ,data);
  // need to explicitely set the terminating NUL character in string attributes
  if (H5Tget_class (atype) == H5T_STRING)
  {
    size_t len = H5Tget_size (atype);
    ((char *) data)[len] = 0;
  }
  H5Tclose(atype);
  H5Aclose(attrib);
  return 1;
}

int H5IO::nAttributes(){
  selectdataset(index);
  unsigned idx=0;
  int count=0;
  H5Aiterate(dataset,&idx,H5IOattr_count,&count);
  return count;
}
//================Chunking Interface-----------------------
int H5IO::reserveChunk(IObase::DataType typeID,int rank,CONST int *dims){
#if 0
  hasread=0;
  for(int i=0;i<rank;i++) chunkdims[i]=dims[i];
  create(rank,dims,typeID);
  current_rank=rank;
  return 1;
#endif
  return 1;
}

int H5IO::writeChunk(CONST int *dims,CONST int *origin,const void *data){
#if 0
  int32 horigin[5]={0,0,0,0,0};
  int32 stride[5]={1,1,1,1,1}; // kludge... we'll fix later
  int32 hdims[5]={0,0,0,0,0};
  int32 rank = current_rank;
  for(int i=0;i<rank;i++) { hdims[i]=dims[i]; horigin[i]=origin[i]; }
  return (int)SDwritedata(sid,horigin,stride,hdims,data);
#endif
  return 1;
}


int H5IO::readChunk(CONST int *dims,CONST int *origin,void *data){
#if 0
  int32 horigin[5]={0,0,0,0,0};
  int32 stride[5]={1,1,1,1,1}; // kludge... we'll fix later
  int32 rank,nt,natt,hdims[5]={0,0,0,0,0};
  char name[128];
  select(index);
  SDgetinfo(sid,name,&rank,hdims,&nt,&natt);
  for(int i=0;i<rank;i++) {hdims[i]=dims[i]; horigin[i]=origin[i];}
  return (int)SDreaddata(sid,horigin,stride,hdims,data);
#endif
return 1;
}

//===============F77 Interface
Long8 f_h5_open (char *file,char *accessname,int flen,int alen){
  // would have used tolower(), but it doesn't exist everywhere.... :(
  IObase::AccessMode mode;
  if(*accessname=='R' || *accessname=='r')
    mode=IObase::Read;
  else if(*accessname=='W' || *accessname=='w' ||
	  *accessname=='C' || *accessname=='c')
    mode=IObase::Write;
  else if(*accessname=='A' || *accessname=='a')
    mode=IObase::Append;
  else {
    fprintf(stderr,"IEEEopen(): Error unknown option [%s] to open file %s\n",
	    accessname,file);
    return 0;
  }
  IObase *fid=new H5IO(file,mode);
  if(fid->isValid())
    return (Long8)fid;
  else
    delete fid; // file open failed
  return 0;
}

Long8 f_h5_openr (char *file,int flen){
  file[flen]='\0'; // null terminate
  return (Long8)(new H5IO(file,IObase::Read));
}

Long8 f_h5_openw (char *file,int flen){
  file[flen]='\0'; // null terminate
  return (Long8)(new H5IO(file,IObase::Create));
}

Long8 f_h5_opena (char *file,int flen){
  file[flen]='\0'; // null terminate
  return (Long8)(new H5IO(file,IObase::Append));
}

IOFile H5IOopen (char *file,char *accessname){
  // Parse all of the ansi stdio access option strings
  IObase::AccessMode mode;
  if(!strcmp(accessname,"read") ||
     !strcmp(accessname,"r") ||
     !strcmp(accessname,"rb"))
    mode=IObase::Read;
  else if(*accessname=='a')
    mode=IObase::Append;
  else if(!strcmp(accessname,"write") ||
	  !strcmp(accessname,"create") ||
	  !strcmp(accessname,"wb"))
    mode = IObase::Write;
  else if(!strcmp(accessname,"w+") ||
	  !strcmp(accessname,"w+b") ||
	  !strcmp(accessname,"wb+"))
    mode=IObase::Append;
  else{
    fprintf(stderr,"IEEEopen(): Error unknown option [%s] to open file %s\n",
	    accessname,file);
    return 0;
  }
  IObase *fid=new H5IO(file,mode);
  if(fid->isValid())
    return (IOFile)fid;
  else
    delete fid; // file open failed
  return 0; // unknown option
}

IOFile H5IOopenRead (char *file){
  return (IOFile)(new H5IO(file,IObase::Read));
}

IOFile H5IOopenWrite (char *file){
  return (IOFile)(new H5IO(file,IObase::Write));
}

IOFile H5IOopenAppend (char *file){
  return (IOFile)(new H5IO(file,IObase::Append));
}