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132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Utility routines to complement the ASN.1 encoding and decoding functions.
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*
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* $Id: secasn1u.c,v 1.5 2011/10/01 00:39:15 wtc%google.com Exp $
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*/
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#include "secasn1.h"
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/*
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* We have a length that needs to be encoded; how many bytes will the
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* encoding take?
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*
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* The rules are that 0 - 0x7f takes one byte (the length itself is the
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* entire encoding); everything else takes one plus the number of bytes
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* in the length.
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*/
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int
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SEC_ASN1LengthLength (unsigned long len)
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{
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int lenlen = 1;
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if (len > 0x7f) {
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do {
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lenlen++;
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len >>= 8;
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} while (len);
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}
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return lenlen;
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}
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/*
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* XXX Move over (and rewrite as appropriate) the rest of the
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* stuff in dersubr.c!
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*/
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/*
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* Find the appropriate subtemplate for the given template.
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* This may involve calling a "chooser" function, or it may just
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* be right there. In either case, it is expected to *have* a
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* subtemplate; this is asserted in debug builds (in non-debug
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* builds, NULL will be returned).
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*
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* "thing" is a pointer to the structure being encoded/decoded
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* "encoding", when true, means that we are in the process of encoding
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* (as opposed to in the process of decoding)
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*/
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const SEC_ASN1Template *
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SEC_ASN1GetSubtemplate (const SEC_ASN1Template *theTemplate, void *thing,
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PRBool encoding)
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{
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const SEC_ASN1Template *subt = NULL;
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PORT_Assert (theTemplate->sub != NULL);
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if (theTemplate->sub != NULL) {
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if (theTemplate->kind & SEC_ASN1_DYNAMIC) {
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SEC_ASN1TemplateChooserPtr chooserp;
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chooserp = *(SEC_ASN1TemplateChooserPtr *) theTemplate->sub;
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if (chooserp) {
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if (thing != NULL)
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thing = (char *)thing - theTemplate->offset;
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subt = (* chooserp)(thing, encoding);
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}
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} else {
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subt = (SEC_ASN1Template*)theTemplate->sub;
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}
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}
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return subt;
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}
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PRBool SEC_ASN1IsTemplateSimple(const SEC_ASN1Template *theTemplate)
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{
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if (!theTemplate) {
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return PR_TRUE; /* it doesn't get any simpler than NULL */
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}
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/* only templates made of one primitive type or a choice of primitive
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types are considered simple */
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if (! (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK))) {
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return PR_TRUE; /* primitive type */
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}
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if (!(theTemplate->kind & SEC_ASN1_CHOICE)) {
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return PR_FALSE; /* no choice means not simple */
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}
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while (++theTemplate && theTemplate->kind) {
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if (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK)) {
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return PR_FALSE; /* complex type */
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}
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}
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return PR_TRUE; /* choice of primitive types */
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}
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