/*
 * Copyright (c) 1995-2004, Index Data
 * See the file LICENSE for details.
 *
 * $Id: ber_oct.c,v 1.2 2004/10/15 00:18:59 adam Exp $
 */

/** 
 * \file ber_oct.c
 * \brief Implements ber_octetstring
 *
 * This source file implements BER encoding and decoding of
 * the OCTETSTRING type.
 */

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include "odr-priv.h"

int ber_octetstring(ODR o, Odr_oct *p, int cons)
{
    int res, len;
    const unsigned char *base;
    unsigned char *c;

    switch (o->direction)
    {
    case ODR_DECODE:
	if ((res = ber_declen(o->bp, &len, odr_max(o))) < 0)
	{
	    odr_seterror(o, OPROTO, 14);
	    return 0;
	}
	o->bp += res;
	if (cons)       /* fetch component strings */
	{
	    base = o->bp;
	    while (odp_more_chunks(o, base, len))
		if (!odr_octetstring(o, &p, 0, 0))
		    return 0;
	    return 1;
	}
	/* primitive octetstring */
	if (len < 0)
	{
	    odr_seterror(o, OOTHER, 15);
	    return 0;
	}
	if (len > odr_max(o))
	{
	    odr_seterror(o, OOTHER, 16);
	    return 0;
	}
	if (len + 1 > p->size - p->len)
	{
	    c = (unsigned char *)odr_malloc(o, p->size += len + 1);
	    if (p->len)
		memcpy(c, p->buf, p->len);
	    p->buf = c;
	}
	if (len)
	    memcpy(p->buf + p->len, o->bp, len);
	p->len += len;
	o->bp += len;
	/* the final null is really not part of the buffer, but */
	/* it helps somes applications that assumes C strings */
	if (len)
	    p->buf[p->len] = '\0';
	return 1;
    case ODR_ENCODE:
	if ((res = ber_enclen(o, p->len, 5, 0)) < 0)
	    return 0;
	if (p->len == 0)
	    return 1;
	if (odr_write(o, p->buf, p->len) < 0)
	    return 0;
	return 1;
    case ODR_PRINT:
	return 1;
    default:
	odr_seterror(o, OOTHER, 17);
	return 0;
    }
}
