NativeEnumerated.c

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/*-
 * Copyright (c) 2004, 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
/*
 * Read the NativeInteger.h for the explanation wrt. differences between
 * INTEGER and NativeInteger.
 * Basically, both are decoders and encoders of ASN.1 INTEGER type, but this
 * implementation deals with the standard (machine-specific) representation
 * of them instead of using the platform-independent buffer.
 */
#include <asn_internal.h>
#include <NativeEnumerated.h>

/*
 * NativeEnumerated basic type description.
 */
static ber_tlv_tag_t asn_DEF_NativeEnumerated_tags[] = {
    (ASN_TAG_CLASS_UNIVERSAL | (10 << 2))
};
asn_TYPE_descriptor_t asn_DEF_NativeEnumerated = {
    "ENUMERATED",           /* The ASN.1 type is still ENUMERATED */
    "ENUMERATED",
    NativeInteger_free,
    NativeInteger_print,
    asn_generic_no_constraint,
    NativeInteger_decode_ber,
    NativeInteger_encode_der,
    NativeInteger_decode_xer,
    NativeEnumerated_encode_xer,
    NativeEnumerated_decode_uper,
    NativeEnumerated_encode_uper,
    0, /* Use generic outmost tag fetcher */
    asn_DEF_NativeEnumerated_tags,
    sizeof(asn_DEF_NativeEnumerated_tags) / sizeof(asn_DEF_NativeEnumerated_tags[0]),
    asn_DEF_NativeEnumerated_tags,  /* Same as above */
    sizeof(asn_DEF_NativeEnumerated_tags) / sizeof(asn_DEF_NativeEnumerated_tags[0]),
    0,  /* No PER visible constraints */
    0, 0,   /* No members */
    0   /* No specifics */
};

asn_enc_rval_t
NativeEnumerated_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
        int ilevel, enum xer_encoder_flags_e flags,
                asn_app_consume_bytes_f *cb, void *app_key) {
    asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
        asn_enc_rval_t er;
        const long *native = (const long *)sptr;
    const asn_INTEGER_enum_map_t *el;

        (void)ilevel;
        (void)flags;

        if(!native) _ASN_ENCODE_FAILED;

    el = INTEGER_map_value2enum(specs, *native);
    if(el) {
        size_t srcsize = el->enum_len + 5;
        char *src = (char *)alloca(srcsize);

        er.encoded = snprintf(src, srcsize, "<%s/>", el->enum_name);
        assert(er.encoded > 0 && (size_t)er.encoded < srcsize);
        if(cb(src, er.encoded, app_key) < 0) _ASN_ENCODE_FAILED;
        _ASN_ENCODED_OK(er);
    } else {
        ASN_DEBUG("ASN.1 forbids dealing with "
            "unknown value of ENUMERATED type");
        _ASN_ENCODE_FAILED;
    }
}

asn_dec_rval_t
NativeEnumerated_decode_uper(asn_codec_ctx_t *opt_codec_ctx,
    asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints,
    void **sptr, asn_per_data_t *pd) {
    asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
    asn_dec_rval_t rval = { RC_OK, 0 };
    long *native = (long *)*sptr;
    asn_per_constraint_t *ct;
    long value;

    (void)opt_codec_ctx;

    if(constraints) ct = &constraints->value;
    else if(td->per_constraints) ct = &td->per_constraints->value;
    else _ASN_DECODE_FAILED;    /* Mandatory! */
    if(!specs) _ASN_DECODE_FAILED;

    if(!native) {
        native = (long *)(*sptr = CALLOC(1, sizeof(*native)));
        if(!native) _ASN_DECODE_FAILED;
    }

    ASN_DEBUG("Decoding %s as NativeEnumerated", td->name);

    if(ct->flags & APC_EXTENSIBLE) {
        int inext = per_get_few_bits(pd, 1);
        if(inext < 0) _ASN_DECODE_STARVED;
        if(inext) ct = 0;
    }

    if(ct && ct->range_bits >= 0) {
        value = per_get_few_bits(pd, ct->range_bits);
        if(value < 0) _ASN_DECODE_STARVED;
        if(value >= (specs->extension
            ? specs->extension - 1 : specs->map_count))
            _ASN_DECODE_FAILED;
    } else {
        if(!specs->extension)
            _ASN_DECODE_FAILED;
        /*
         * X.691, #10.6: normally small non-negative whole number;
         */
        value = uper_get_nsnnwn(pd);
        if(value < 0) _ASN_DECODE_STARVED;
        value += specs->extension - 1;
        if(value >= specs->map_count)
            _ASN_DECODE_FAILED;
    }

    *native = specs->value2enum[value].nat_value;
    ASN_DEBUG("Decoded %s = %ld", td->name, *native);

    return rval;
}

static int
NativeEnumerated__compar_value2enum(const void *ap, const void *bp) {
    const asn_INTEGER_enum_map_t *a = ap;
    const asn_INTEGER_enum_map_t *b = bp;
    if(a->nat_value == b->nat_value)
        return 0;
    if(a->nat_value < b->nat_value)
        return -1;
    return 1;
}

asn_enc_rval_t
NativeEnumerated_encode_uper(asn_TYPE_descriptor_t *td,
    asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
    asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
    asn_enc_rval_t er;
    long native, value;
    asn_per_constraint_t *ct;
    int inext = 0;
    asn_INTEGER_enum_map_t key;
    asn_INTEGER_enum_map_t *kf;

    if(!sptr) _ASN_ENCODE_FAILED;
    if(!specs) _ASN_ENCODE_FAILED;

    if(constraints) ct = &constraints->value;
    else if(td->per_constraints) ct = &td->per_constraints->value;
    else _ASN_ENCODE_FAILED;    /* Mandatory! */

    ASN_DEBUG("Encoding %s as NativeEnumerated", td->name);

    er.encoded = 0;

    native = *(long *)sptr;
    if(native < 0) _ASN_ENCODE_FAILED;

    key.nat_value = native;
    kf = bsearch(&key, specs->value2enum, specs->map_count,
        sizeof(key), NativeEnumerated__compar_value2enum);
    if(!kf) {
        ASN_DEBUG("No element corresponds to %ld", native);
        _ASN_ENCODE_FAILED;
    }
    value = kf - specs->value2enum;

    if(ct->range_bits >= 0) {
        int cmpWith = specs->extension
                ? specs->extension - 1 : specs->map_count;
        if(value >= cmpWith)
            inext = 1;
    }
    if(ct->flags & APC_EXTENSIBLE) {
        if(per_put_few_bits(po, inext, 1))
            _ASN_ENCODE_FAILED;
        if(inext) ct = 0;
    } else if(inext) {
        _ASN_ENCODE_FAILED;
    }

    if(ct && ct->range_bits >= 0) {
        if(per_put_few_bits(po, value, ct->range_bits))
            _ASN_ENCODE_FAILED;
        _ASN_ENCODED_OK(er);
    }

    if(!specs->extension)
        _ASN_ENCODE_FAILED;

    /*
     * X.691, #10.6: normally small non-negative whole number;
     */
    ASN_DEBUG("value = %ld, ext = %d, inext = %d, res = %ld",
        value, specs->extension, inext,
        value - (inext ? (specs->extension - 1) : 0));
    if(uper_put_nsnnwn(po, value - (inext ? (specs->extension - 1) : 0)))
        _ASN_ENCODE_FAILED;

    _ASN_ENCODED_OK(er);
}