source: branches/samba-3.5.x/source4/heimdal/lib/asn1/extra.c

/*
 * Copyright (c) 2003 - 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "der_locl.h"
#include "heim_asn1.h"

RCSID("$Id$");

int
encode_heim_any(unsigned char *p, size_t len,
                const heim_any *data, size_t *size)
{
    if (data->length > len)
        return ASN1_OVERFLOW;
    p -= data->length;
    len -= data->length;
    memcpy (p+1, data->data, data->length);
    *size = data->length;
    return 0;
}

int
decode_heim_any(const unsigned char *p, size_t len,
                heim_any *data, size_t *size)
{
    size_t len_len, length, l;
    Der_class thisclass;
    Der_type thistype;
    unsigned int thistag;
    int e;

    memset(data, 0, sizeof(*data));

    e = der_get_tag (p, len, &thisclass, &thistype, &thistag, &l);
    if (e) return e;
    if (l > len)
        return ASN1_OVERFLOW;
    e = der_get_length(p + l, len - l, &length, &len_len);
    if (e) return e;
    if (length == ASN1_INDEFINITE) {
        if (len < len_len + l)
            return ASN1_OVERFLOW;
        length = len - (len_len + l);
    } else {
        if (len < length + len_len + l)
            return ASN1_OVERFLOW;
    }
   
    data->data = malloc(length + len_len + l);
    if (data->data == NULL)
        return ENOMEM;
    data->length = length + len_len + l;
    memcpy(data->data, p, length + len_len + l);
   
    if (size)
        *size = length + len_len + l;

    return 0;
}

void
free_heim_any(heim_any *data)
{
    free(data->data);
    data->data = NULL;
}

size_t
length_heim_any(const heim_any *data)
{
    return data->length;
}

int
copy_heim_any(const heim_any *from, heim_any *to)
{
    to->data = malloc(from->length);
    if (to->data == NULL && from->length != 0)
        return ENOMEM;
    memcpy(to->data, from->data, from->length);
    to->length = from->length;
    return 0;
}

int
encode_heim_any_set(unsigned char *p, size_t len,
                    const heim_any_set *data, size_t *size)
{
    return encode_heim_any(p, len, data, size);
}


int
decode_heim_any_set(const unsigned char *p, size_t len,
                heim_any_set *data, size_t *size)
{
    memset(data, 0, sizeof(*data));
    data->data = malloc(len);
    if (data->data == NULL && len != 0)
        return ENOMEM;
    data->length = len;
    memcpy(data->data, p, len);
    if (size) *size = len;
    return 0;
}

void
free_heim_any_set(heim_any_set *data)
{
    free_heim_any(data);
}

size_t
length_heim_any_set(const heim_any *data)
{
    return length_heim_any(data);
}

int
copy_heim_any_set(const heim_any_set *from, heim_any_set *to)
{
    return copy_heim_any(from, to);
}

int
heim_any_cmp(const heim_any_set *p, const heim_any_set *q)
{
    if (p->length != q->length)
        return p->length - q->length;
    return memcmp(p->data, q->data, p->length);
}