зеркало из https://github.com/mozilla/gecko-dev.git
95 строки
2.7 KiB
C
95 строки
2.7 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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#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
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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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