/*
 * (C) Copyright 2005- 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_padding
   IMPLEMENTS = init;preferred_size
   MEMBERS=const char*  section_offset
   MEMBERS=const char*  section_length
   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 void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);
static size_t preferred_size(grib_accessor*, int);

typedef struct grib_accessor_padtoeven
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in bytes */
    /* Members defined in padding */
    /* Members defined in padtoeven */
    const char* section_offset;
    const char* section_length;
} grib_accessor_padtoeven;

extern grib_accessor_class* grib_accessor_class_padding;

static grib_accessor_class _grib_accessor_class_padtoeven = {
    &grib_accessor_class_padding,    /* super                     */
    "padtoeven",                     /* name                      */
    sizeof(grib_accessor_padtoeven), /* size                      */
    0,                               /* inited */
    &init_class,                     /* init_class */
    &init,                           /* init                      */
    0,                               /* post_init                      */
    0,                               /* free mem                       */
    0,                               /* describes himself         */
    0,                               /* get length of section     */
    0,                               /* get length of string      */
    0,                               /* get number of values      */
    0,                               /* get number of bytes      */
    0,                               /* get offset to bytes           */
    0,                               /* get native type               */
    0,                               /* get sub_section                */
    0,                               /* grib_pack procedures long      */
    0,                               /* grib_pack procedures long      */
    0,                               /* grib_pack procedures long      */
    0,                               /* grib_unpack procedures long    */
    0,                               /* grib_pack procedures double    */
    0,                               /* grib_unpack procedures double  */
    0,                               /* grib_pack procedures string    */
    0,                               /* 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   */
    &preferred_size,                 /* preferred_size   */
    0,                               /* resize   */
    0,                               /* nearest_smaller_value */
    0,                               /* next accessor    */
    0,                               /* compare vs. another accessor   */
    0,                               /* unpack only ith value          */
    0,                               /* unpack a subarray         */
    0,                               /* clear          */
    0,                               /* clone accessor          */
};


grib_accessor_class* grib_accessor_class_padtoeven = &_grib_accessor_class_padtoeven;


static void init_class(grib_accessor_class* c)
{
    c->dump                   = (*(c->super))->dump;
    c->next_offset            = (*(c->super))->next_offset;
    c->string_length          = (*(c->super))->string_length;
    c->value_count            = (*(c->super))->value_count;
    c->byte_count             = (*(c->super))->byte_count;
    c->byte_offset            = (*(c->super))->byte_offset;
    c->get_native_type        = (*(c->super))->get_native_type;
    c->sub_section            = (*(c->super))->sub_section;
    c->pack_missing           = (*(c->super))->pack_missing;
    c->is_missing             = (*(c->super))->is_missing;
    c->pack_long              = (*(c->super))->pack_long;
    c->unpack_long            = (*(c->super))->unpack_long;
    c->pack_double            = (*(c->super))->pack_double;
    c->unpack_double          = (*(c->super))->unpack_double;
    c->pack_string            = (*(c->super))->pack_string;
    c->unpack_string          = (*(c->super))->unpack_string;
    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->resize                 = (*(c->super))->resize;
    c->nearest_smaller_value  = (*(c->super))->nearest_smaller_value;
    c->next                   = (*(c->super))->next;
    c->compare                = (*(c->super))->compare;
    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 size_t preferred_size(grib_accessor* a, int from_handle)
{
    grib_accessor_padtoeven* self = (grib_accessor_padtoeven*)a;
    long offset                   = 0;
    long length                   = 0;
    long seclen;

    grib_get_long_internal(grib_handle_of_accessor(a), self->section_offset, &offset);
    grib_get_long_internal(grib_handle_of_accessor(a), self->section_length, &length);

    if ((length % 2) && from_handle) {
#if 0
        grib_context_log(a->context,
                GRIB_LOG_ERROR,"GRIB message has an odd length section (%ld, %s)",
                (long)length,a->name);
#endif
        return 0;
    }

    /* printf("EVEN %ld %ld\n",(long) a->offset,(long) offset);*/
    seclen = a->offset - offset;

    return (seclen % 2) ? 1 : 0;
}

static void init(grib_accessor* a, const long len, grib_arguments* args)
{
    grib_accessor_padtoeven* self = (grib_accessor_padtoeven*)a;

    self->section_offset = grib_arguments_get_name(grib_handle_of_accessor(a), args, 0);
    self->section_length = grib_arguments_get_name(grib_handle_of_accessor(a), args, 1);

    a->length = preferred_size(a, 1);
}
