/* * 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-len.C - ASN.1 Length manipluation 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-len.cpp,v 1.1.1.1 2001/05/18 23:14:05 mb Exp $ // $Log: asn-len.cpp,v $ // Revision 1.1.1.1 2001/05/18 23:14:05 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 18:44:57 dmitch // These snacc-generated source files are now checked in to allow cross-platform build. // // Revision 1.2 2000/06/08 20:05:35 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 05:21:51 mb // Added snacc c++ library // // Revision 1.5 1997/02/16 20:26:04 rj // check-in of a few cosmetic changes // // Revision 1.4 1995/07/24 20:33:15 rj // changed `_' to `-' in file names. // // Revision 1.3 1994/10/08 04:18:24 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 10:01:13 rj // comment leader fixed. // // Revision 1.1 1994/08/28 09:21:00 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" /* * Encodes the given length to the given buffer. * returns the number of octets written to the buffer. */ AsnLen BEncDefLen (BUF_TYPE b, AsnLen len) { /* * unrolled for efficiency * (check each possibitlity of the 4 byte integer) */ if (len < 128) { b.PutByteRvs (len); return 1; } else if (len < 256) { b.PutByteRvs (len); b.PutByteRvs (0x81); return 2; } else if (len < 65536) { b.PutByteRvs (len); b.PutByteRvs (len >> 8); b.PutByteRvs (0x82); return 3; } else if (len < 16777126) { b.PutByteRvs (len); b.PutByteRvs (len >> 8); b.PutByteRvs (len >> 16); b.PutByteRvs (0x83); return 4; } else { b.PutByteRvs (len); b.PutByteRvs (len >> 8); b.PutByteRvs (len >> 16); b.PutByteRvs (len >> 24); b.PutByteRvs (0x84); return 5; } } /* EncodeDefLen */ /* * Decode a BER length from the given buffer. Increments bytesDecoded * by the number of octets of the encoded length. Flags an * error if the length is too large or a read error occurs */ AsnLen BDecLen (BUF_TYPE b, AsnLen &bytesDecoded, ENV_TYPE env) { AsnLen len; unsigned char byte; int lenBytes; byte = b.GetByte(); if (b.ReadError()) { Asn1Error << "BDecLen: decoded past end of data" << endl; longjmp (env, -9); } bytesDecoded++; if (byte < 128) /* short length */ return byte; else if (byte == (unsigned char) 0x080) /* indef len indicator */ return INDEFINITE_LEN; else /* long len form */ { /* * strip high bit to get # bytes left in len */ lenBytes = byte & (unsigned char) 0x7f; if (lenBytes > sizeof (long int)) { Asn1Error << "BDecLen: ERROR - length overflow" << endl; longjmp (env, -10); } bytesDecoded += lenBytes; for (len = 0; lenBytes > 0; lenBytes--) len = (len << 8) | (unsigned long int) b.GetByte(); if (b.ReadError()) { Asn1Error << "BDecLen: decoded past end of data" << endl; longjmp (env, -11); } return len; } /* not reached */ } /* * Encodes an End of Contents (EOC) to the given buffer. * Returns the encoded length. */ AsnLen BEncEoc (BUF_TYPE b) { b.PutByteRvs (0); b.PutByteRvs (0); return 2; } /* BEncEoc */ /* * Decodes an EOC from the given buffer. flags an error if the * octets are non-zero or if read error occured. */ void BDecEoc (BUF_TYPE b, AsnLen &bytesDecoded, ENV_TYPE env) { if ((b.GetByte() != 0) || (b.GetByte() != 0) || b.ReadError()) { Asn1Error << "BDecEoc: ERROR - non zero byte in EOC or end of data reached" << endl; longjmp (env, -12); } bytesDecoded += 2; } /* BDecEoc */