SecuritySNACCRuntime/c-lib/inc/min-buf.h

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20  * .../c-lib/inc/min-buf.h - trivial buffer routines.
  21  *             only use these for
  22  *                encoding - if you know you 'buffer' is big enough
  23  *                            to hold the encoded value
  24  *
  25  *                decoding - if you know that the encoding is error
  26  *                           free.
  27  *
  28  *
  29  * The minimal buffer is simply a block of mem referenced
  30  * by a char **(ie BUF_TYPE char**).  These are very efficient
  31  * but should only be used when it is safe (see above) or you're
  32  * willing to risk reading past the end of the buffer or writing
  33  * 'past' the beginning (segmentation faults/bus errors etc).
  34  *
  35  * No checks for reading or writing past the buffer are done.
  36  * every operation is assumed to succeed.
  37  * MS 92
  38  *
  39  * Copyright (C) 1992 Michael Sample and the University of British Columbia
  40  *
  41  * This library is free software; you can redistribute it and/or
  42  * modify it provided that this copyright/license information is retained
  43  * in original form.
  44  *
  45  * If you modify this file, you must clearly indicate your changes.
  46  *
  47  * This source code is distributed in the hope that it will be
  48  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  49  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  50  *
  51  * $Header: /cvs/Darwin/Security/SecuritySNACCRuntime/c-lib/inc/min-buf.h,v 1.1.1.1 2001/05/18 23:14:08 mb Exp $
  52  * $Log: min-buf.h,v $
  53  * Revision 1.1.1.1  2001/05/18 23:14:08  mb
  54  * Move from private repository to open source repository
  55  *
  56  * Revision 1.2  2001/05/05 00:59:23  rmurphy
  57  * Adding darwin license headers
  58  *
  59  * Revision 1.1.1.1  1999/03/16 18:06:21  aram
  60  * Originals from SMIME Free Library.
  61  *
  62  * Revision 1.2  1995/07/24 21:01:21  rj
  63  * changed `_' to `-' in file names.
  64  *
  65  * Revision 1.1  1994/08/28  09:21:42  rj
  66  * first check-in. for a list of changes to the snacc-1.1 distribution please refer to the ChangeLog.
  67  *
  68  */
  69
  70 #ifndef _min_buf_h_
  71 #define _min_buf_h_
  72
  73 #define MinBufGetByte(b)\
  74     (unsigned char)(*((*(b))++))
  75
  76 #define MinBufGetSeg( b, lenPtr)\
  77     *(b);\
  78     (*b) += *lenPtr;
  79
  80 #define MinBufCopy( dst, b, len)\
  81     memcpy ((dst), *(b), (len));\
  82     (*(b)) += (len);
  83
  84 #define MinBufSkip( b, len) ((*(b)) += len)
  85
  86 #define MinBufPeekByte( b)  (**(b))
  87
  88
  89 #define MinBufPutByteRvs( b,  byte)\
  90     (*(--(*(b))) = (byte))
  91
  92 #define MinBufPutSegRvs( b, data, len)\
  93     ((*(b)) = (*(b)) - (len));\
  94     memcpy (*(b), (data), (len));
  95
  96
  97 #define MinBufReadError( b)     0  /* always false */
  98 #define MinBufWriteError( b)    0  /* always false */
  99
 100 #endif /* conditional include */