/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ // file: .../c++-lib/src/asn-tag.C - ASN.1 tag manipulation routines // // MS 92/06/18 // Copyright (C) 1992 Michael Sample and the University of British Columbia // // This library is free software; you can redistribute it and/or // modify it provided that this copyright/license information is retained // in original form. // // If you modify this file, you must clearly indicate your changes. // // This source code is distributed in the hope that it will be // useful, but WITHOUT ANY WARRANTY; without even the implied warranty // of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. // // $Header: /cvs/Darwin/Security/SecuritySNACCRuntime/c++-lib/c++/asn-tag.cpp,v 1.1.1.1 2001/05/18 23:14:06 mb Exp $ // $Log: asn-tag.cpp,v $ // Revision 1.1.1.1 2001/05/18 23:14:06 mb // Move from private repository to open source repository // // Revision 1.2 2001/05/05 00:59:17 rmurphy // Adding darwin license headers // // Revision 1.1 2000/06/15 18:44:58 dmitch // These snacc-generated source files are now checked in to allow cross-platform build. // // Revision 1.2 2000/06/08 20:05:36 dmitch // Mods for X port. These files are actually machine generated and probably don't need to be in CVS.... // // Revision 1.1.1.1 2000/03/09 01:00:06 rmurphy // Base Fortissimo Tree // // Revision 1.1 1999/02/25 05:21:54 mb // Added snacc c++ library // // Revision 1.6 1997/09/03 12:10:30 wan // Patch to tag decoding for tags > 2^14 (thanks to Enrico Badella) // // Revision 1.5 1997/02/16 20:26:06 rj // check-in of a few cosmetic changes // // Revision 1.4 1995/07/24 20:33:17 rj // changed `_' to `-' in file names. // // Revision 1.3 1994/10/08 04:18:30 rj // code for meta structures added (provides information about the generated code itself). // // code for Tcl interface added (makes use of the above mentioned meta code). // // virtual inline functions (the destructor, the Clone() function, BEnc(), BDec() and Print()) moved from inc/*.h to src/*.C because g++ turns every one of them into a static non-inline function in every file where the .h file gets included. // // made Print() const (and some other, mainly comparison functions). // // several `unsigned long int' turned into `size_t'. // // Revision 1.2 1994/08/28 10:01:20 rj // comment leader fixed. // // Revision 1.1 1994/08/28 09:21:09 rj // first check-in. for a list of changes to the snacc-1.1 distribution please refer to the ChangeLog. #include "asn-config.h" #include "asn-len.h" #include "asn-tag.h" /* * Decode a BER Tag from the given buffer. Error is * flagged if the tag is too long or if a read error occurs. */ AsnTag BDecTag (BUF_TYPE b, AsnLen &bytesDecoded, ENV_TYPE env) { AsnTag tagId; AsnTag tmpTagId; int i; tagId = ((AsnTag) b.GetByte()) << ((sizeof (AsnTag)-1) *8); bytesDecoded++; /* check if long tag format (ie code > 31) */ if ((tagId & (((AsnTag) 0x1f) << ((sizeof (AsnTag)-1)*8))) == (((AsnTag)0x1f) << ((sizeof (AsnTag)-1)*8))) { i = 2; do { tmpTagId = (AsnTag) b.GetByte(); tagId |= (tmpTagId << ((sizeof (AsnTag)-i)*8)); bytesDecoded++; i++; } while ((tmpTagId & (AsnTag)0x80) && (i <= sizeof (AsnTag))); /* * check for too long a tag */ if (i > (sizeof (AsnTag)+1)) { Asn1Error << "BDecTag: ERROR - tag value overflow" << endl; longjmp (env, -21); } } if (b.ReadError()) { Asn1Error << "BDecTag: ERROR - decoded past the end of data" << endl; longjmp (env, -22); } return tagId; } /* BDecTag */