src/helper/binarybuffer.h

   1 /***************************************************************************
   2  *   Copyright (C) 2004, 2005 by Dominic Rath                              *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                      *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifndef BINARYBUFFER_H
  24 #define BINARYBUFFER_H
  25
  26 #include "types.h"
  27
  28 /* support functions to access arbitrary bits in a byte array
  29  * flip_u32 inverses the bit order inside a 32-bit word (31..0 -> 0..31)
  30  */
  31
  32 /* inlining this will help show what fn that is taking time during profiling. */
  33 static __inline void buf_set_u32(u8* buffer, unsigned int first, unsigned int num, u32 value)
  34 {
  35         if ((num==32)&&(first==0))
  36         {
  37                 buffer[3]=(value>>24)&0xff;
  38                 buffer[2]=(value>>16)&0xff;
  39                 buffer[1]=(value>>8)&0xff;
  40                 buffer[0]=(value>>0)&0xff;
  41         } else
  42         {
  43                 unsigned int i;
  44
  45                 for (i=first; i<first+num; i++)
  46                 {
  47                         if (((value >> (i-first))&1) == 1)
  48                                 buffer[i/8] |= 1 << (i%8);
  49                         else
  50                                 buffer[i/8] &= ~(1 << (i%8));
  51                 }
  52         }
  53 }
  54 static __inline u32 buf_get_u32(u8* buffer, unsigned int first, unsigned int num)
  55 {
  56         if ((num==32)&&(first==0))
  57         {
  58                 return (((u32)buffer[3])<<24)|(((u32)buffer[2])<<16)|(((u32)buffer[1])<<8)|(((u32)buffer[0])<<0);
  59         } else
  60         {
  61                 u32 result = 0;
  62                 unsigned int i;
  63
  64                 for (i=first; i<first+num; i++)
  65                 {
  66                         if (((buffer[i/8]>>(i%8))&1) == 1)
  67                                 result |= 1 << (i-first);
  68                 }
  69
  70                 return result;
  71         }
  72 }
  73
  74 extern u32 flip_u32(u32 value, unsigned int num);
  75
  76 extern int buf_cmp(u8 *buf1, u8 *buf2, int size);
  77 extern int buf_cmp_mask(u8 *buf1, u8 *buf2, u8 *mask, int size);
  78 extern u8* buf_cpy(u8 *from, u8 *to, int size);
  79
  80 extern u8* buf_set_ones(u8 *buf, int count);
  81 extern u8* buf_set_buf(u8 *src, int src_start, u8 *dst, int dst_start, int len);
  82
  83 extern int str_to_buf(const char *str, int len, u8 *bin_buf, int buf_size, int radix);
  84 extern char* buf_to_str(const u8 *buf, int size, int radix);
  85
  86 struct scan_field_s;
  87 extern int buf_to_u32_handler(u8 *in_buf, void *priv, struct scan_field_s *field);
  88
  89 #define CEIL(m, n)      ((m + n - 1) / n)
  90
  91 /* read a u32 from a buffer in target memory endianness */
  92 static __inline u32 fast_target_buffer_get_u32(u8 *buffer, int little)
  93 {
  94         if (little)
  95                 return le_to_h_u32(buffer);
  96         else
  97                 return be_to_h_u32(buffer);
  98 }
  99
 100 #endif /* BINARYBUFFER_H */