зеркало из https://github.com/mozilla/pjs.git
107 строки
3.2 KiB
C
107 строки
3.2 KiB
C
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* 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
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*/
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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 1.2 2001-01-07 08:13:12 nelsonb%netscape.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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