/* * 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. */ /* * asn_tag.c - BER encode, decode and untility routines for ASN.1 Tags. * * MS 92 * 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/src/asn-tag.c,v 1.1.1.1 2001/05/18 23:14:08 mb Exp $ * $Log: asn-tag.c,v $ * Revision 1.1.1.1 2001/05/18 23:14:08 mb * Move from private repository to open source repository * * Revision 1.2 2001/05/05 00:59:25 rmurphy * Adding darwin license headers * * Revision 1.1.1.1 1999/03/16 18:06:32 aram * Originals from SMIME Free Library. * * Revision 1.5 1997/09/03 12:11:41 wan * Patch to tag decoding for tags > 2^14 (thanks to Enrico Badella) * Patch to TblEncTag to emit final 0x00 if previous octet signals continuation * * Revision 1.4 1997/03/13 09:15:18 wan * Improved dependency generation for stupid makedepends. * Corrected PeekTag to peek into buffer only as far as necessary. * Added installable error handler. * Fixed small glitch in idl-code generator (Markku Savela <msa@msa.tte.vtt.fi>). * * Revision 1.3 1997/02/28 13:39:50 wan * Modifications collected for new version 1.3: Bug fixes, tk4.2. * * Revision 1.2 1995/07/27 09:01:25 rj * merged PeekTag(), a function used only by the type table code. * * changed `_' to `-' in file names. * * Revision 1.1 1994/08/28 09:46:01 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" /* * Returns an AsnTag. An AsnTag is simply an encoded tag * shifted to fill up an unsigned long int (first tag byte * in most sig byte of long int) * This rep permits easy case stmt comparison of tags. * NOTE: The unsigned long rep for tag BREAKS if the * the tag's code is over 2^21 (very unlikely) * * RETURNS 0 if decoded a 0 byte (ie first byte of an EOC) */ AsnTag BDecTag PARAMS ((b, bytesDecoded, env), BUF_TYPE b _AND_ AsnLen *bytesDecoded _AND_ jmp_buf env) { AsnTag tagId; AsnTag tmpTagId; int i; tagId = ((AsnTag)BufGetByte (b)) << ((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) BufGetByte (b); tagId |= (tmpTagId << ((sizeof (AsnTag)-i)*8)); (*bytesDecoded)++; i++; } while ((tmpTagId & (AsnTag)0x80) && (i <= sizeof (AsnTag))); /* * check for tag that is too long */ if (i > (sizeof (AsnTag)+1)) { Asn1Error ("BDecTag: ERROR - tag value overflow\n"); longjmp (env, -25); } } if (BufReadError (b)) { Asn1Error ("BDecTag: ERROR - decoded past the end of data\n"); longjmp (env, -26); } return tagId; } /* BDecTag */ #if TTBL AsnTag PeekTag PARAMS ((b, env), BUF_TYPE b _AND_ ENV_TYPE env) { AsnTag tagId, tmpTagId; int i; unsigned char buf[sizeof(AsnTag)]; unsigned char* p = buf; /* * peek/copy the next (max size of tag) bytes * to get the tag info. The Peek buffer routines * were added to the standard set for this function. */ BufPeekCopy ((char*)buf, b, 1); tagId = ((AsnTag)*p++) << ((sizeof (AsnTag)-1)*8); /* 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 { BufPeekCopy ((char*)buf, b, i); tmpTagId = (AsnTag) *p++; tagId |= (tmpTagId << ((sizeof (AsnTag)-i)*8)); i++; } while ((tmpTagId & (AsnTag)0x80) && (i <= sizeof (AsnTag))); /* * check for tag that is too long */ if (i > (sizeof (AsnTag)+1)) { Asn1Error ("BDecTag: ERROR - tag value overflow\n"); longjmp (env, -1004); } } return tagId; } /* PeekTag */ #endif /* TTBL */