mui/classes/thebar/mcc/brc1.c

   1 /***************************************************************************
   2
   3  TheBar.mcc - Next Generation Toolbar MUI Custom Class
   4  Copyright (C) 2003-2005 Alfonso Ranieri
   5  Copyright (C) 2005-2013 by TheBar.mcc Open Source Team
   6
   7  This library is free software; you can redistribute it and/or
   8  modify it under the terms of the GNU Lesser General Public
   9  License as published by the Free Software Foundation; either
  10  version 2.1 of the License, or (at your option) any later version.
  11
  12  This library is distributed in the hope that it will be useful,
  13  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  Lesser General Public License for more details.
  16
  17  TheBar class Support Site:  http://www.sf.net/projects/thebar
  18
  19  $Id$
  20
  21 ***************************************************************************/
  22
  23 #include "class.h"
  24
  25 /***********************************************************************/
  26
  27 #define DUMP     0
  28 #define RUN      1
  29 #define MINRUN   3
  30 #define MAXRUN 128
  31 #define MAXDAT 128
  32
  33 #define BRCUnpackOK    0
  34 #define BRCUnpackError 1
  35
  36 /***********************************************************************/
  37
  38 int
  39 BRCUnpack(APTR pSource, APTR pDest, LONG srcBytes0, LONG dstBytes0)
  40 {
  41   signed char *source = pSource;
  42   signed char *dest = pDest;
  43   LONG srcBytes = srcBytes0;
  44   LONG dstBytes = dstBytes0;
  45   int result = BRCUnpackOK;
  46
  47   ENTER();
  48
  49   while(dstBytes > 0)
  50   {
  51     WORD n;
  52
  53     if(--srcBytes < 0)
  54     {
  55       result = BRCUnpackError;
  56       break;
  57     }
  58
  59     n = *source++;
  60
  61     if(n >= 0)
  62     {
  63       n++;
  64
  65       srcBytes -= n;
  66       dstBytes -= n;
  67       if(srcBytes < 0 || dstBytes < 0)
  68       {
  69         result = BRCUnpackError;
  70         break;
  71       }
  72
  73       do
  74       {
  75         *dest++ = *source++;
  76       }
  77       while(--n > 0);
  78     }
  79     else if(n != -128)
  80     {
  81       signed char c;
  82
  83       n = -n + 1;
  84
  85       srcBytes--;
  86       dstBytes -= n;
  87       if(srcBytes < 0 || dstBytes < 0)
  88       {
  89         result = BRCUnpackError;
  90         break;
  91       }
  92
  93       c = *source++;
  94
  95       do
  96       {
  97         *dest++ = c;
  98       }
  99       while(--n > 0);
 100     }
 101   }
 102
 103   RETURN(result);
 104   return result;
 105 }
 106
 107 /***********************************************************************/