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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* 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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