text: /*
   * Copyright 2005-2016 ECMWF.
   *
   * This software is licensed under the terms of the Apache Licence Version 2.0
   * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
   *
   * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
   * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
   */
  /***********************************************************
   *  Enrico Fucile
   ***********************************************************/
  
  #include "grib_api_internal.h"
  /*
     This is used by make_class.pl
  
     START_CLASS_DEF
     CLASS      = accessor
     SUPER      = grib_accessor_class_gen
     IMPLEMENTS = unpack_string;pack_string
     IMPLEMENTS = unpack_long;pack_long
     IMPLEMENTS = unpack_double;pack_double
     IMPLEMENTS = init;dump;string_length
     IMPLEMENTS = post_init;value_count
     IMPLEMENTS = next_offset
     IMPLEMENTS = get_native_type
     IMPLEMENTS = compare
     MEMBERS = const char* key
     MEMBERS = long start
     MEMBERS = size_t length
     MEMBERS = long scale
     END_CLASS_DEF
  
   */
  
  /* START_CLASS_IMP */
  
  /*
  
  Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
  Instead edit values between START_CLASS_DEF and END_CLASS_DEF
  or edit "accessor.class" and rerun ./make_class.pl
  
  */
  
  static int  get_native_type(grib_accessor*);
  static int pack_double(grib_accessor*, const double* val,size_t *len);
  static int pack_long(grib_accessor*, const long* val,size_t *len);
  static int pack_string(grib_accessor*, const char*, size_t *len);
  static int unpack_double(grib_accessor*, double* val,size_t *len);
  static int unpack_long(grib_accessor*, long* val,size_t *len);
  static int unpack_string (grib_accessor*, char*, size_t *len);
  static size_t string_length(grib_accessor*);
  static long next_offset(grib_accessor*);
  static int value_count(grib_accessor*,long*);
  static void dump(grib_accessor*, grib_dumper*);
  static void init(grib_accessor*,const long, grib_arguments* );
  static void post_init(grib_accessor*);
  static void init_class(grib_accessor_class*);
  static int compare(grib_accessor*, grib_accessor*);
  
  typedef struct grib_accessor_to_double {
      grib_accessor          att;
  /* Members defined in gen */
  /* Members defined in to_double */
  	const char* key;
  	long start;
  	size_t length;
  	long scale;
  } grib_accessor_to_double;
  
  extern grib_accessor_class* grib_accessor_class_gen;
  
  static grib_accessor_class _grib_accessor_class_to_double = {
      &grib_accessor_class_gen,                      /* super                     */
      "to_double",                      /* name                      */
      sizeof(grib_accessor_to_double),  /* size                      */
      0,                           /* inited */
      &init_class,                 /* init_class */
      &init,                       /* init                      */
      &post_init,                  /* post_init                      */
      0,                    /* free mem                       */
      &dump,                       /* describes himself         */
      &next_offset,                /* get length of section     */
      &string_length,              /* get length of string      */
      &value_count,                /* get number of values      */
      0,                 /* get number of bytes      */
      0,                /* get offset to bytes           */
      &get_native_type,            /* get native type               */
      0,                /* get sub_section                */
      0,               /* grib_pack procedures long      */
      0,                 /* grib_pack procedures long      */
      &pack_long,                  /* grib_pack procedures long      */
      &unpack_long,                /* grib_unpack procedures long    */
      &pack_double,                /* grib_pack procedures double    */
      &unpack_double,              /* grib_unpack procedures double  */
      &pack_string,                /* grib_pack procedures string    */
      &unpack_string,              /* grib_unpack procedures string  */
      0,          /* grib_pack array procedures string    */
      0,        /* grib_unpack array procedures string  */
      0,                 /* grib_pack procedures bytes     */
      0,               /* grib_unpack procedures bytes   */
      0,            /* pack_expression */
      0,              /* notify_change   */
      0,                /* update_size   */
      0,            /* preferred_size   */
      0,                    /* resize   */
      0,      /* nearest_smaller_value */
      0,                       /* next accessor    */
      &compare,                    /* compare vs. another accessor   */
      0,     /* unpack only ith value          */
      0,     /* unpack a subarray         */
      0,              		/* clear          */
      0,               		/* clone accessor          */
  };
  
  
  grib_accessor_class* grib_accessor_class_to_double = &_grib_accessor_class_to_double;
  
  
  static void init_class(grib_accessor_class* c)
  {
  	c->byte_count	=	(*(c->super))->byte_count;
  	c->byte_offset	=	(*(c->super))->byte_offset;
  	c->sub_section	=	(*(c->super))->sub_section;
  	c->pack_missing	=	(*(c->super))->pack_missing;
  	c->is_missing	=	(*(c->super))->is_missing;
  	c->pack_string_array	=	(*(c->super))->pack_string_array;
  	c->unpack_string_array	=	(*(c->super))->unpack_string_array;
  	c->pack_bytes	=	(*(c->super))->pack_bytes;
  	c->unpack_bytes	=	(*(c->super))->unpack_bytes;
  	c->pack_expression	=	(*(c->super))->pack_expression;
  	c->notify_change	=	(*(c->super))->notify_change;
  	c->update_size	=	(*(c->super))->update_size;
  	c->preferred_size	=	(*(c->super))->preferred_size;
  	c->resize	=	(*(c->super))->resize;
  	c->nearest_smaller_value	=	(*(c->super))->nearest_smaller_value;
  	c->next	=	(*(c->super))->next;
  	c->unpack_double_element	=	(*(c->super))->unpack_double_element;
  	c->unpack_double_subarray	=	(*(c->super))->unpack_double_subarray;
  	c->clear	=	(*(c->super))->clear;
  	c->make_clone	=	(*(c->super))->make_clone;
  }
  
  /* END_CLASS_IMP */
  
  static void init(grib_accessor* a, const long len , grib_arguments* arg )
  {
      grib_accessor_to_double* self=(grib_accessor_to_double*)a;
  
      self->key=grib_arguments_get_name(grib_handle_of_accessor(a),arg,0);
      self->start=grib_arguments_get_long(grib_handle_of_accessor(a),arg,1);
      self->length=grib_arguments_get_long(grib_handle_of_accessor(a),arg,2);
      self->scale=grib_arguments_get_long(grib_handle_of_accessor(a),arg,3);
      if (!self->scale) self->scale=1;
  
      a->flags |= GRIB_ACCESSOR_FLAG_READ_ONLY;
      a->length=0;
  }
  
  static void post_init(grib_accessor* a )
  {
      return;
  }
  
  static int value_count(grib_accessor* a,long* count)
  {
      grib_accessor_to_double* self=(grib_accessor_to_double*)a;
      size_t size=0;
  
      int err=grib_get_size(grib_handle_of_accessor(a), self->key,&size);
      *count=size;
  
      return err;
  }
  
  static size_t string_length(grib_accessor* a)
  {
      grib_accessor_to_double* self=(grib_accessor_to_double*)a;
      size_t size=0;
  
      if (self->length) return self->length;
  
      _grib_get_string_length(a,&size);
      return size;
  }
  
  static void dump(grib_accessor* a, grib_dumper* dumper)
  {
      grib_dump_string(dumper,a,NULL);
  }
  
  static int  get_native_type(grib_accessor* a)
  {
      return GRIB_TYPE_LONG;
  }
  
  static int unpack_string(grib_accessor* a, char* val, size_t *len)
  {
      int err=0;
      grib_accessor_to_double* self=(grib_accessor_to_double*)a;
      char buff[512]={0,};
      size_t length;
      size_t size=512;
  
      length=string_length(a);
  
      if( len[0] < length+1 )
      {
          grib_context_log(a->context, GRIB_LOG_ERROR, "unpack_string: Wrong size (%d) for %s it contains %d values ", len[0], a->name , a->length+1 );
          len[0] = 0;
          return GRIB_ARRAY_TOO_SMALL;
      }
  
      err=grib_get_string(grib_handle_of_accessor(a),self->key,buff,&size);
      if (err) return err;
      if (length > size) {
          err=GRIB_STRING_TOO_SMALL;
          length=size;
      }
  
      memcpy(val,buff+self->start,length);
  
      val[length] = 0;
      len[0] = length;
      return GRIB_SUCCESS;
  }
  
  static int pack_string(grib_accessor* a, const char* val, size_t *len)
  {
      return GRIB_NOT_IMPLEMENTED;
  }
  
  static int pack_long(grib_accessor* a, const long*  v, size_t *len)
  {
      grib_context_log(a->context,GRIB_LOG_ERROR, " Should not pack %s as long", a->name);
      return GRIB_NOT_IMPLEMENTED;
  }
  
  static int pack_double(grib_accessor* a, const double*v, size_t *len)
  {
      grib_context_log(a->context,GRIB_LOG_ERROR, " Should not pack %s  as double", a->name);
      return GRIB_NOT_IMPLEMENTED;
  }
  
  static int  unpack_long   (grib_accessor* a, long*  v, size_t *len)
  {
      grib_accessor_to_double* self=(grib_accessor_to_double*)a;
      char val[1024]={0,};
      size_t l = sizeof(val);
      char  *last = NULL;
      int err=grib_unpack_string (a , val, &l);
  
      if (err) return err;
  
      *v = strtol(val,&last,10);
      if (*last) {err=GRIB_WRONG_CONVERSION;}
      *v/=self->scale;
  
      return err;
  }
  
  static int  unpack_double   (grib_accessor* a, double*  v, size_t *len)
  {
      grib_accessor_to_double* self=(grib_accessor_to_double*)a;
      char val[1024]={0,};
      size_t l = sizeof(val);
      char  *last = NULL;
      int err=grib_unpack_string (a , val, &l);
  
      if (err) return err;
  
      *v = strtod(val,&last);
      if (*last) {err=GRIB_WRONG_CONVERSION;}
      *v/=self->scale;
  
      return err;
  }
  
  static long next_offset(grib_accessor* a)
  {
      return a->offset+a->length;
  }
  
  static int compare(grib_accessor* a,grib_accessor* b)
  {
      int retval=0;
      char *aval=0;
      char *bval=0;
      int err=0;
  
      size_t alen = 0;
      size_t blen = 0;
      long count=0;
  
      err=grib_value_count(a,&count);
      if (err) return err;
      alen=count;
  
      err=grib_value_count(b,&count);
      if (err) return err;
      blen=count;
  
      if (alen != blen) return GRIB_COUNT_MISMATCH;
  
      aval=(char*)grib_context_malloc(a->context,alen*sizeof(char));
      bval=(char*)grib_context_malloc(b->context,blen*sizeof(char));
  
      grib_unpack_string(a,aval,&alen);
      grib_unpack_string(b,bval,&blen);
  
      retval = GRIB_SUCCESS;
      if (strcmp(aval,bval)) retval = GRIB_STRING_VALUE_MISMATCH;
  
      grib_context_free(a->context,aval);
      grib_context_free(b->context,bval);
  
      return retval;
  }
  