BOOLEAN.c

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/*-
 * Copyright (c) 2003, 2005 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <asn_codecs_prim.h>
#include <BOOLEAN.h>

/*
 * BOOLEAN basic type description.
 */
static ber_tlv_tag_t asn_DEF_BOOLEAN_tags[] = {
    (ASN_TAG_CLASS_UNIVERSAL | (1 << 2))
};
asn_TYPE_descriptor_t asn_DEF_BOOLEAN = {
    "BOOLEAN",
    "BOOLEAN",
    BOOLEAN_free,
    BOOLEAN_print,
    asn_generic_no_constraint,
    BOOLEAN_decode_ber,
    BOOLEAN_encode_der,
    BOOLEAN_decode_xer,
    BOOLEAN_encode_xer,
    BOOLEAN_decode_uper,    /* Unaligned PER decoder */
    BOOLEAN_encode_uper,    /* Unaligned PER encoder */
    0, /* Use generic outmost tag fetcher */
    asn_DEF_BOOLEAN_tags,
    sizeof(asn_DEF_BOOLEAN_tags) / sizeof(asn_DEF_BOOLEAN_tags[0]),
    asn_DEF_BOOLEAN_tags,   /* Same as above */
    sizeof(asn_DEF_BOOLEAN_tags) / sizeof(asn_DEF_BOOLEAN_tags[0]),
    0,  /* No PER visible constraints */
    0, 0,   /* No members */
    0   /* No specifics */
};

/*
 * Decode BOOLEAN type.
 */
asn_dec_rval_t
BOOLEAN_decode_ber(asn_codec_ctx_t *opt_codec_ctx,
        asn_TYPE_descriptor_t *td,
        void **bool_value, const void *buf_ptr, size_t size,
        int tag_mode) {
    BOOLEAN_t *st = (BOOLEAN_t *)*bool_value;
    asn_dec_rval_t rval;
    ber_tlv_len_t length;
    ber_tlv_len_t lidx;

    if(st == NULL) {
        st = (BOOLEAN_t *)(*bool_value = CALLOC(1, sizeof(*st)));
        if(st == NULL) {
            rval.code = RC_FAIL;
            rval.consumed = 0;
            return rval;
        }
    }

    ASN_DEBUG("Decoding %s as BOOLEAN (tm=%d)",
        td->name, tag_mode);

    /*
     * Check tags.
     */
    rval = ber_check_tags(opt_codec_ctx, td, 0, buf_ptr, size,
        tag_mode, 0, &length, 0);
    if(rval.code != RC_OK)
        return rval;

    ASN_DEBUG("Boolean length is %d bytes", (int)length);

    buf_ptr = ((const char *)buf_ptr) + rval.consumed;
    size -= rval.consumed;
    if(length > (ber_tlv_len_t)size) {
        rval.code = RC_WMORE;
        rval.consumed = 0;
        return rval;
    }

    /*
     * Compute boolean value.
     */
    for(*st = 0, lidx = 0;
        (lidx < length) && *st == 0; lidx++) {
        /*
         * Very simple approach: read bytes until the end or
         * value is already TRUE.
         * BOOLEAN is not supposed to contain meaningful data anyway.
         */
        *st |= ((const uint8_t *)buf_ptr)[lidx];
    }

    rval.code = RC_OK;
    rval.consumed += length;

    ASN_DEBUG("Took %ld/%ld bytes to encode %s, value=%d",
        (long)rval.consumed, (long)length,
        td->name, *st);
    
    return rval;
}

asn_enc_rval_t
BOOLEAN_encode_der(asn_TYPE_descriptor_t *td, void *sptr,
    int tag_mode, ber_tlv_tag_t tag,
    asn_app_consume_bytes_f *cb, void *app_key) {
    asn_enc_rval_t erval;
    BOOLEAN_t *st = (BOOLEAN_t *)sptr;

    erval.encoded = der_write_tags(td, 1, tag_mode, 0, tag, cb, app_key);
    if(erval.encoded == -1) {
        erval.failed_type = td;
        erval.structure_ptr = sptr;
        return erval;
    }

    if(cb) {
        uint8_t bool_value;

        bool_value = *st ? 0xff : 0; /* 0xff mandated by DER */

        if(cb(&bool_value, 1, app_key) < 0) {
            erval.encoded = -1;
            erval.failed_type = td;
            erval.structure_ptr = sptr;
            return erval;
        }
    }

    erval.encoded += 1;

    _ASN_ENCODED_OK(erval);
}


/*
 * Decode the chunk of XML text encoding INTEGER.
 */
static enum xer_pbd_rval
BOOLEAN__xer_body_decode(asn_TYPE_descriptor_t *td, void *sptr, const void *chunk_buf, size_t chunk_size) {
    BOOLEAN_t *st = (BOOLEAN_t *)sptr;
    const char *p = (const char *)chunk_buf;

    (void)td;

    if(chunk_size && p[0] == 0x3c /* '<' */) {
        switch(xer_check_tag(chunk_buf, chunk_size, "false")) {
        case XCT_BOTH:
            /* "<false/>" */
            *st = 0;
            break;
        case XCT_UNKNOWN_BO:
            if(xer_check_tag(chunk_buf, chunk_size, "true")
                    != XCT_BOTH)
                return XPBD_BROKEN_ENCODING;
            /* "<true/>" */
            *st = 1;    /* Or 0xff as in DER?.. */
            break;
        default:
            return XPBD_BROKEN_ENCODING;
        }
        return XPBD_BODY_CONSUMED;
    } else {
        return XPBD_BROKEN_ENCODING;
    }
}


asn_dec_rval_t
BOOLEAN_decode_xer(asn_codec_ctx_t *opt_codec_ctx,
    asn_TYPE_descriptor_t *td, void **sptr, const char *opt_mname,
        const void *buf_ptr, size_t size) {

    return xer_decode_primitive(opt_codec_ctx, td,
        sptr, sizeof(BOOLEAN_t), opt_mname, buf_ptr, size,
        BOOLEAN__xer_body_decode);
}

asn_enc_rval_t
BOOLEAN_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) {
    const BOOLEAN_t *st = (const BOOLEAN_t *)sptr;
    asn_enc_rval_t er;

    (void)ilevel;
    (void)flags;

    if(!st) _ASN_ENCODE_FAILED;

    if(*st) {
        _ASN_CALLBACK("<true/>", 7);
        er.encoded = 7;
    } else {
        _ASN_CALLBACK("<false/>", 8);
        er.encoded = 8;
    }

    _ASN_ENCODED_OK(er);
cb_failed:
    _ASN_ENCODE_FAILED;
}

int
BOOLEAN_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
    asn_app_consume_bytes_f *cb, void *app_key) {
    const BOOLEAN_t *st = (const BOOLEAN_t *)sptr;
    const char *buf;
    size_t buflen;

    (void)td;   /* Unused argument */
    (void)ilevel;   /* Unused argument */

    if(st) {
        if(*st) {
            buf = "TRUE";
            buflen = 4;
        } else {
            buf = "FALSE";
            buflen = 5;
        }
    } else {
        buf = "<absent>";
        buflen = 8;
    }

    return (cb(buf, buflen, app_key) < 0) ? -1 : 0;
}

void
BOOLEAN_free(asn_TYPE_descriptor_t *td, void *ptr, int contents_only) {
    if(td && ptr && !contents_only) {
        FREEMEM(ptr);
    }
}

asn_dec_rval_t
BOOLEAN_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_dec_rval_t rv;
    BOOLEAN_t *st = (BOOLEAN_t *)*sptr;

    (void)opt_codec_ctx;
    (void)constraints;

    if(!st) {
        st = (BOOLEAN_t *)(*sptr = MALLOC(sizeof(*st)));
        if(!st) _ASN_DECODE_FAILED;
    }

    /*
     * Extract a single bit
     */
    switch(per_get_few_bits(pd, 1)) {
    case 1: *st = 1; break;
    case 0: *st = 0; break;
    case -1: default: _ASN_DECODE_STARVED;
    }

    ASN_DEBUG("%s decoded as %s", td->name, *st ? "TRUE" : "FALSE");

    rv.code = RC_OK;
    rv.consumed = 1;
    return rv;
}


asn_enc_rval_t
BOOLEAN_encode_uper(asn_TYPE_descriptor_t *td,
    asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
    const BOOLEAN_t *st = (const BOOLEAN_t *)sptr;
    asn_enc_rval_t er = { 0, 0, 0 };

    (void)constraints;

    if(!st) _ASN_ENCODE_FAILED;

    if(per_put_few_bits(po, *st ? 1 : 0, 1))
        _ASN_ENCODE_FAILED;

    _ASN_ENCODED_OK(er);
}