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/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/*
* Utility routines to complement the ASN.1 encoding and decoding functions.
*
* $Id$
*/
#include "secasn1.h"
/*
* We have a length that needs to be encoded; how many bytes will the
* encoding take?
*
* The rules are that 0 - 0x7f takes one byte (the length itself is the
* entire encoding); everything else takes one plus the number of bytes
* in the length.
*/
int
SEC_ASN1LengthLength (unsigned long len)
{
int lenlen = 1;
if (len > 0x7f) {
do {
lenlen++;
len >>= 8;
} while (len);
}
return lenlen;
}
/*
* XXX Move over (and rewrite as appropriate) the rest of the
* stuff in dersubr.c!
*/
/*
* Find the appropriate subtemplate for the given template.
* This may involve calling a "chooser" function, or it may just
* be right there. In either case, it is expected to *have* a
* subtemplate; this is asserted in debug builds (in non-debug
* builds, NULL will be returned).
*
* "thing" is a pointer to the structure being encoded/decoded
* "encoding", when true, means that we are in the process of encoding
* (as opposed to in the process of decoding)
*/
const SEC_ASN1Template *
SEC_ASN1GetSubtemplate (const SEC_ASN1Template *theTemplate, void *thing,
PRBool encoding)
{
const SEC_ASN1Template *subt = NULL;
PORT_Assert (theTemplate->sub != NULL);
if (theTemplate->sub != NULL) {
if (theTemplate->kind & SEC_ASN1_DYNAMIC) {
SEC_ASN1TemplateChooserPtr chooserp;
chooserp = *(SEC_ASN1TemplateChooserPtr *) theTemplate->sub;
if (chooserp) {
if (thing != NULL)
thing = (char *)thing - theTemplate->offset;
subt = (* chooserp)(thing, encoding);
}
} else {
subt = (SEC_ASN1Template*)theTemplate->sub;
}
}
return subt;
}
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