1/* 2 * The contents of this file are subject to the Mozilla Public 3 * License Version 1.1 (the "License"); you may not use this file 4 * except in compliance with the License. You may obtain a copy of 5 * the License at http://www.mozilla.org/MPL/ 6 * 7 * Software distributed under the License is distributed on an "AS 8 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 9 * implied. See the License for the specific language governing 10 * rights and limitations under the License. 11 * 12 * The Original Code is the Netscape security libraries. 13 * 14 * The Initial Developer of the Original Code is Netscape 15 * Communications Corporation. Portions created by Netscape are 16 * Copyright (C) 1994-2000 Netscape Communications Corporation. All 17 * Rights Reserved. 18 * 19 * Contributor(s): 20 * 21 * Alternatively, the contents of this file may be used under the 22 * terms of the GNU General Public License Version 2 or later (the 23 * "GPL"), in which case the provisions of the GPL are applicable 24 * instead of those above. If you wish to allow use of your 25 * version of this file only under the terms of the GPL and not to 26 * allow others to use your version of this file under the MPL, 27 * indicate your decision by deleting the provisions above and 28 * replace them with the notice and other provisions required by 29 * the GPL. If you do not delete the provisions above, a recipient 30 * may use your version of this file under either the MPL or the 31 * GPL. 32 */ 33 34/* 35 * Utility routines to complement the ASN.1 encoding and decoding functions. 36 * 37 * $Id: secasn1u.c,v 1.3 2004/05/13 15:29:13 dmitch Exp $ 38 */ 39 40#include "secasn1.h" 41 42 43/* 44 * We have a length that needs to be encoded; how many bytes will the 45 * encoding take? 46 * 47 * The rules are that 0 - 0x7f takes one byte (the length itself is the 48 * entire encoding); everything else takes one plus the number of bytes 49 * in the length. 50 */ 51int 52SEC_ASN1LengthLength (unsigned long len) 53{ 54 int lenlen = 1; 55 56 if (len > 0x7f) { 57 do { 58 lenlen++; 59 len >>= 8; 60 } while (len); 61 } 62 63 return lenlen; 64} 65 66 67/* 68 * XXX Move over (and rewrite as appropriate) the rest of the 69 * stuff in dersubr.c! 70 */ 71 72 73/* 74 * Find the appropriate subtemplate for the given template. 75 * This may involve calling a "chooser" function, or it may just 76 * be right there. In either case, it is expected to *have* a 77 * subtemplate; this is asserted in debug builds (in non-debug 78 * builds, NULL will be returned). 79 * 80 * "thing" is a pointer to the structure being encoded/decoded 81 * "encoding", when true, means that we are in the process of encoding 82 * (as opposed to in the process of decoding) 83 */ 84const SecAsn1Template * 85SEC_ASN1GetSubtemplate ( 86 const SecAsn1Template *theTemplate, 87 void *thing, 88 PRBool encoding 89 #ifdef __APPLE__ 90 , 91 const char *buf // for decode only 92 #endif 93 ) 94{ 95 const SecAsn1Template *subt = NULL; 96 97 PORT_Assert (theTemplate->sub != NULL); 98 if (theTemplate->sub != NULL) { 99 if (theTemplate->kind & SEC_ASN1_DYNAMIC) { 100 SecAsn1TemplateChooserPtr chooserp; 101 102 chooserp = *(SecAsn1TemplateChooserPtr *) theTemplate->sub; 103 if (chooserp) { 104 void *dest = thing; 105 if (thing != NULL) { 106 thing = (char *)thing - theTemplate->offset; 107 } 108 subt = (* chooserp)(thing, encoding, buf, dest); 109 } 110 } else { 111 subt = (SecAsn1Template*)theTemplate->sub; 112 } 113 } 114 return subt; 115} 116