/* * 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_len.c - BER encode, decode and utilities for ASN.1 lengths. * * indefinite lens are representd by the highest AsnLen * * 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-len.c,v 1.1.1.1 2001/05/18 23:14:08 mb Exp $ * $Log: asn-len.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 18:06:30 aram * Originals from SMIME Free Library. * * Revision 1.2 1995/07/27 08:58:36 rj * merged PeekEoc(), a function used only by the type table code. * * changed `_' to `-' in file names. * * Revision 1.1 1994/08/28 09:45:54 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" AsnLen BEncDefLen PARAMS ((b, len), BUF_TYPE b _AND_ AsnLen len) { /* * unrolled for efficiency * check each possibitlity of the 4 byte integer */ if (len < 128) { BufPutByteRvs (b, len); return 1; } else if (len < 256) { BufPutByteRvs (b, len); BufPutByteRvs (b, 0x81); return 2; } else if (len < 65536) { BufPutByteRvs (b, len); BufPutByteRvs (b, len >> 8); BufPutByteRvs (b, 0x82); return 3; } else if (len < 16777126) { BufPutByteRvs (b, len); BufPutByteRvs (b, len >> 8); BufPutByteRvs (b, len >> 16); BufPutByteRvs (b, 0x83); return 4; } else { BufPutByteRvs (b, len); BufPutByteRvs (b, len >> 8); BufPutByteRvs (b, len >> 16); BufPutByteRvs (b, len >> 24); BufPutByteRvs (b, 0x84); return 5; } } /* BEncDefLen */ /* * non unrolled version */ AsnLen BEncDefLen2 PARAMS ((b, len), BUF_TYPE b _AND_ long int len) { int i; unsigned long int j; if (len < 128) { BufPutByteRvs (b, len); return 1; } else { for (i = 0, j = len; j > 0; j >>= 8, i++) BufPutByteRvs (b, j); BufPutByteRvs (b, 0x80 | i); return i + 1; } } /* BEncDefLen2 */ /* * decodes and returns an ASN.1 length */ AsnLen BDecLen PARAMS ((b, bytesDecoded, env), BUF_TYPE b _AND_ unsigned long int *bytesDecoded _AND_ jmp_buf env) { AsnLen len; AsnLen byte; int lenBytes; byte = (unsigned long int) BufGetByte (b); if (BufReadError (b)) { Asn1Error ("BDecLen: ERROR - decoded past end of data\n"); longjmp (env, -13); } (*bytesDecoded)++; if (byte < 128) /* short length */ return byte; else if (byte == (AsnLen) 0x080) /* indef len indicator */ return INDEFINITE_LEN; else /* long len form */ { /* * strip high bit to get # bytes left in len */ lenBytes = byte & (AsnLen) 0x7f; if (lenBytes > sizeof (AsnLen)) { Asn1Error ("BDecLen: ERROR - length overflow\n"); longjmp (env, -14); } (*bytesDecoded) += lenBytes; for (len = 0; lenBytes > 0; lenBytes--) len = (len << 8) | (AsnLen) BufGetByte (b); if (BufReadError (b)) { Asn1Error ("BDecLen: ERROR - decoded past end of data\n"); longjmp (env, -15); } return len; } /* not reached */ } /* BDecLen */ /* MACRO AsnLen BEncEoc PARAMS ((b), BUF_TYPE b) { BufPutByteRvs (b, 0); BufPutByteRvs (b, 0); return 2; } BEncEoc */ /* * Decodes an End of Contents (EOC) marker from the given buffer. * Flags and error if the octets are non-zero or if a read error * occurs. Increments bytesDecoded by the length of the EOC marker. */ void BDecEoc PARAMS ((b, bytesDecoded, env), BUF_TYPE b _AND_ AsnLen *bytesDecoded _AND_ jmp_buf env) { if ((BufGetByte (b) != 0) || (BufGetByte (b) != 0) || BufReadError (b)) { Asn1Error ("BDecEoc: ERROR - non zero byte in EOC or end of data reached\n"); longjmp (env, -16); } (*bytesDecoded) += 2; } /* BDecEoc */ #if TTBL /* returns true if the next tag is actually and EOC */ int PeekEoc PARAMS ((b), BUF_TYPE b) { return BufPeekByte (b) == 0; } /* PeekEoc */ #endif