gnss-sdr/src/core/libs/supl/asn-supl/xer_encoder.c

/*-
 * SPDX-FileCopyrightText: (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * SPDX-License-Identifier: BSD-1-Clause
 */
#include <asn_internal.h>
#include <errno.h>
#include <stdio.h>

/*
 * The XER encoder of any type. May be invoked by the application.
 */
asn_enc_rval_t xer_encode(asn_TYPE_descriptor_t *td, void *sptr,
    enum xer_encoder_flags_e xer_flags,
    asn_app_consume_bytes_f *cb, void *app_key)
{
    asn_enc_rval_t er;
    asn_enc_rval_t tmper;
    const char *mname;
    size_t mlen;
    int xcan = (xer_flags & XER_F_CANONICAL) ? 1 : 2;

    if (!td || !sptr)
        {
            goto cb_failed;
        }

    mname = td->xml_tag;
    mlen = strlen(mname);

    _ASN_CALLBACK3("<", 1, mname, mlen, ">", 1);

    tmper = td->xer_encoder(td, sptr, 1, xer_flags, cb, app_key);
    if (tmper.encoded == -1)
        {
            return tmper;
        }

    _ASN_CALLBACK3("</", 2, mname, mlen, ">\n", xcan);

    er.encoded = 4 + xcan + (2 * mlen) + tmper.encoded;

    _ASN_ENCODED_OK(er);
cb_failed:
    _ASN_ENCODE_FAILED;
}

/*
 * This is a helper function for xer_fprint, which directs all incoming data
 * into the provided file descriptor.
 */
static int xer__print2fp(const void *buffer, size_t size, void *app_key)
{
    FILE *stream = (FILE *)app_key;

    if (fwrite(buffer, 1, size, stream) != size)
        {
            return -1;
        }

    return 0;
}

int xer_fprint(FILE *stream, asn_TYPE_descriptor_t *td, void *sptr)
{
    asn_enc_rval_t er;

    if (!stream)
        {
            stream = stdout;
        }
    if (!td || !sptr)
        {
            return -1;
        }

    er = xer_encode(td, sptr, XER_F_BASIC, xer__print2fp, stream);
    if (er.encoded == -1)
        {
            return -1;
        }

    return fflush(stream);
}