krb5/asn.1/asn1_get.h

/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 * src/lib/krb5/asn.1/asn1_get.h
 *
 * Copyright 1994 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */

#ifndef __ASN1_GET_H__
#define __ASN1_GET_H__

/* ASN.1 substructure decoding procedures */

#include "k5-int.h"
#include "krbasn1.h"
#include "asn1buf.h"

typedef struct {
#if 1
    /*
     * Smaller run-time storage, and on x86 the compiler can use byte
     * loads, stores, and compares, but on other platforms the compiler
     * may need to load and widen before comparing... see how this works
     * out.
     */
    unsigned int asn1class : 8, construction : 8;
#else
    asn1_class asn1class;
    asn1_construction construction;
#endif
    asn1_tagnum tagnum;
    unsigned int length;
    int indef;
} taginfo;

asn1_error_code asn1_get_tag_2 (asn1buf *buf, taginfo *tinfo);

#if 0
asn1_error_code asn1_get_tag_indef(asn1buf *buf,
                                   asn1_class *Class,
                                   asn1_construction *construction,
                                   asn1_tagnum *tagnum,
                                   unsigned int *retlen, int *indef);

asn1_error_code asn1_get_tag(asn1buf *buf,
                             asn1_class *Class,
                             asn1_construction *construction,
                             asn1_tagnum *tagnum,
                             unsigned int *retlen);
/*
 * requires  *buf is allocated
 * effects   Decodes the tag in *buf.  If class != NULL, returns
 *           the class in *Class.  Similarly, the construction,
 *           tag number, and length are returned in *construction,
 *           *tagnum, and *retlen, respectively.
 *
 *           If *buf is empty to begin with, *tagnum is set to
 *           ASN1_TAGNUM_CEILING.
 *
 *           Returns ASN1_OVERRUN if *buf is exhausted during the
 *           parse.
 */
#endif

asn1_error_code asn1_get_sequence(asn1buf *buf, unsigned int *retlen,
                                  int *indef);
/*
 * requires  *buf is allocated
 * effects   Decodes a tag from *buf and returns ASN1_BAD_ID if it
 *           doesn't have a sequence ID.  If retlen != NULL, the
 *           associated length is returned in *retlen.
 */
#endif