/*
 * (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.
 */

#include "grib_api_internal.h"

/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_gen
   IMPLEMENTS = unpack_long
   IMPLEMENTS = pack_long
   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 pack_long(grib_accessor*, const long* val, size_t* len);
static int unpack_long(grib_accessor*, long* val, size_t* len);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_int64
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in int64 */
} grib_accessor_int64;

extern grib_accessor_class* grib_accessor_class_gen;

static grib_accessor_class _grib_accessor_class_int64 = {
    &grib_accessor_class_gen,    /* super                     */
    "int64",                     /* name                      */
    sizeof(grib_accessor_int64), /* size                      */
    0,                           /* inited */
    &init_class,                 /* init_class */
    0,                           /* 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      */
    &pack_long,                  /* grib_pack procedures long      */
    &unpack_long,                /* 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   */
    0,                           /* 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_int64 = &_grib_accessor_class_int64;


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_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->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->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 int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    long value                = 0;
    long pos                  = a->offset;
    unsigned char* data       = grib_handle_of_accessor(a)->buffer->data;
    unsigned long long result = 0, tmp;
    int i;

    if (*len < 1) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Wrong size for %s it contains %d values ", a->name, 1);
        *len = 0;
        return GRIB_ARRAY_TOO_SMALL;
    }

    for (i = 0; i < 8; i++) {
        result <<= 8;
        result |= data[pos + i];
    }

    value = result;
    tmp   = value;

    /* Result does not fit in long */
    if (tmp != result) {
        grib_context_log(a->context, GRIB_LOG_ERROR, "Value for %s cannot be decoded as a 'long' (%llu)", a->name, result);
        return GRIB_DECODING_ERROR;
    }

    *val = value;
    *len = 1;
    return GRIB_SUCCESS;
}


static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    return GRIB_NOT_IMPLEMENTED;
}