/*
 * Copyright (c) 1995 - 2000 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.
 */

/* Almost all programs use these routines (implicitly) so it's a good
 * place to put the version string. */

#include "version.h"

#include "krb_locl.h"

RCSID("$Id: rw.c,v 1.12.2.1 2000/06/23 03:37:33 assar Exp $");

int
krb_get_int(void *f, u_int32_t *to, int size, int lsb)
{
    int i;
    unsigned char *from = (unsigned char *)f;

    *to = 0;
    if(lsb){
	for(i = size-1; i >= 0; i--)
	    *to = (*to << 8) | from[i];
    }else{
	for(i = 0; i < size; i++)
	    *to = (*to << 8) | from[i];
    }
    return size;
}

int
krb_put_int(u_int32_t from, void *to, size_t rem, int size)
{
    int i;
    unsigned char *p = (unsigned char *)to;

    if (rem < size)
	return -1;

    for(i = size - 1; i >= 0; i--){
	p[i] = from & 0xff;
	from >>= 8;
    }
    return size;
}


/* addresses are always sent in network byte order */

int
krb_get_address(void *from, u_int32_t *to)
{
    unsigned char *p = (unsigned char*)from;
    *to = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
    return 4;
}

int
krb_put_address(u_int32_t addr, void *to, size_t rem)
{
    return krb_put_int(ntohl(addr), to, rem, 4);
}

int
krb_put_string(const char *from, void *to, size_t rem)
{
    size_t len = strlen(from) + 1;

    if (rem < len)
	return -1;
    memcpy(to, from, len);
    return len;
}

int
krb_get_string(void *from, char *to, size_t to_size)
{
    strlcpy (to, (char *)from, to_size);
    return strlen((char *)from) + 1;
}

int
krb_get_nir(void *from,
	    char *name, size_t name_len,
	    char *instance, size_t instance_len,
	    char *realm, size_t realm_len)
{
    char *p = (char *)from;

    p += krb_get_string(p, name, name_len);
    p += krb_get_string(p, instance, instance_len);
    if(realm)
	p += krb_get_string(p, realm, realm_len);
    return p - (char *)from;
}

int
krb_put_nir(const char *name,
	    const char *instance,
	    const char *realm,
	    void *to,
	    size_t rem)
{
    char *p = (char *)to;
    int tmp;
    
    tmp = krb_put_string(name, p, rem);
    if (tmp < 0)
	return tmp;
    p += tmp;
    rem -= tmp;

    tmp = krb_put_string(instance, p, rem);
    if (tmp < 0)
	return tmp;
    p += tmp;
    rem -= tmp;
    
    if (realm) {
	tmp = krb_put_string(realm, p, rem);
	if (tmp < 0)
	    return tmp;
	p += tmp;
	rem -= tmp;
    }
    return p - (char *)to;
}