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annotate nss/lib/util/secasn1u.c @ 0:1e5118fa0cb1

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This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4
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5 /*
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6 * Utility routines to complement the ASN.1 encoding and decoding functions.
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7 */
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8
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9 #include "secasn1.h"
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10
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11
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12 /*
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13 * We have a length that needs to be encoded; how many bytes will the
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14 * encoding take?
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15 *
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16 * The rules are that 0 - 0x7f takes one byte (the length itself is the
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17 * entire encoding); everything else takes one plus the number of bytes
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18 * in the length.
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19 */
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20 int
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21 SEC_ASN1LengthLength (unsigned long len)
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22 {
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23 int lenlen = 1;
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24
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25 if (len > 0x7f) {
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26 do {
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27 lenlen++;
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28 len >>= 8;
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29 } while (len);
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30 }
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31
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32 return lenlen;
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33 }
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34
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35
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36 /*
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37 * XXX Move over (and rewrite as appropriate) the rest of the
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38 * stuff in dersubr.c!
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39 */
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40
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41
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42 /*
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43 * Find the appropriate subtemplate for the given template.
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44 * This may involve calling a "chooser" function, or it may just
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45 * be right there. In either case, it is expected to *have* a
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46 * subtemplate; this is asserted in debug builds (in non-debug
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47 * builds, NULL will be returned).
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48 *
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49 * "thing" is a pointer to the structure being encoded/decoded
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50 * "encoding", when true, means that we are in the process of encoding
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51 * (as opposed to in the process of decoding)
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52 */
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53 const SEC_ASN1Template *
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54 SEC_ASN1GetSubtemplate (const SEC_ASN1Template *theTemplate, void *thing,
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55 PRBool encoding)
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56 {
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57 const SEC_ASN1Template *subt = NULL;
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58
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59 PORT_Assert (theTemplate->sub != NULL);
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60 if (theTemplate->sub != NULL) {
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61 if (theTemplate->kind & SEC_ASN1_DYNAMIC) {
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62 SEC_ASN1TemplateChooserPtr chooserp;
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63
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64 chooserp = *(SEC_ASN1TemplateChooserPtr *) theTemplate->sub;
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65 if (chooserp) {
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66 if (thing != NULL)
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67 thing = (char *)thing - theTemplate->offset;
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68 subt = (* chooserp)(thing, encoding);
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69 }
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70 } else {
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71 subt = (SEC_ASN1Template*)theTemplate->sub;
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72 }
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73 }
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74 return subt;
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75 }
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76
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77 PRBool SEC_ASN1IsTemplateSimple(const SEC_ASN1Template *theTemplate)
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78 {
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79 if (!theTemplate) {
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80 return PR_TRUE; /* it doesn't get any simpler than NULL */
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81 }
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82 /* only templates made of one primitive type or a choice of primitive
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83 types are considered simple */
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84 if (! (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK))) {
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85 return PR_TRUE; /* primitive type */
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86 }
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87 if (!(theTemplate->kind & SEC_ASN1_CHOICE)) {
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88 return PR_FALSE; /* no choice means not simple */
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89 }
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90 while (++theTemplate && theTemplate->kind) {
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91 if (theTemplate->kind & (~SEC_ASN1_TAGNUM_MASK)) {
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92 return PR_FALSE; /* complex type */
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93 }
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94 }
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95 return PR_TRUE; /* choice of primitive types */
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96 }
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97
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