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Side by Side Diff: nss/lib/util/secasn1u.c

Issue 2078763002: Delete bundled copy of NSS and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/nss@master
Patch Set: Delete bundled copy of NSS and replace with README. Created 4 years, 6 months ago
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4
5 /*
6 * Utility routines to complement the ASN.1 encoding and decoding functions.
7 */
8
9 #include "secasn1.h"
10
11
12 /*
13 * We have a length that needs to be encoded; how many bytes will the
14 * encoding take?
15 *
16 * The rules are that 0 - 0x7f takes one byte (the length itself is the
17 * entire encoding); everything else takes one plus the number of bytes
18 * in the length.
19 */
20 int
21 SEC_ASN1LengthLength (unsigned long len)
22 {
23 int lenlen = 1;
24
25 if (len > 0x7f) {
26 do {
27 lenlen++;
28 len >>= 8;
29 } while (len);
30 }
31
32 return lenlen;
33 }
34
35
36 /*
37 * XXX Move over (and rewrite as appropriate) the rest of the
38 * stuff in dersubr.c!
39 */
40
41
42 /*
43 * Find the appropriate subtemplate for the given template.
44 * This may involve calling a "chooser" function, or it may just
45 * be right there. In either case, it is expected to *have* a
46 * subtemplate; this is asserted in debug builds (in non-debug
47 * builds, NULL will be returned).
48 *
49 * "thing" is a pointer to the structure being encoded/decoded
50 * "encoding", when true, means that we are in the process of encoding
51 * (as opposed to in the process of decoding)
52 */
53 const SEC_ASN1Template *
54 SEC_ASN1GetSubtemplate (const SEC_ASN1Template *theTemplate, void *thing,
55 PRBool encoding)
56 {
57 const SEC_ASN1Template *subt = NULL;
58
59 PORT_Assert (theTemplate->sub != NULL);
60 if (theTemplate->sub != NULL) {
61 if (theTemplate->kind & SEC_ASN1_DYNAMIC) {
62 SEC_ASN1TemplateChooserPtr chooserp;
63
64 chooserp = *(SEC_ASN1TemplateChooserPtr *) theTemplate->sub;
65 if (chooserp) {
66 if (thing != NULL)
67 thing = (char *)thing - theTemplate->offset;
68 subt = (* chooserp)(thing, encoding);
69 }
70 } else {
71 subt = (SEC_ASN1Template*)theTemplate->sub;
72 }
73 }
74 return subt;
75 }
76
77 PRBool SEC_ASN1IsTemplateSimple(const SEC_ASN1Template *theTemplate)
78 {
79 if (!theTemplate) {
80 return PR_TRUE; /* it doesn't get any simpler than NULL */
81 }
82 /* only templates made of one primitive type or a choice of primitive
83 types are considered simple */
84 if (! (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK))) {
85 return PR_TRUE; /* primitive type */
86 }
87 if (!(theTemplate->kind & SEC_ASN1_CHOICE)) {
88 return PR_FALSE; /* no choice means not simple */
89 }
90 while (++theTemplate && theTemplate->kind) {
91 if (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK)) {
92 return PR_FALSE; /* complex type */
93 }
94 }
95 return PR_TRUE; /* choice of primitive types */
96 }
97
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