src/helper/binarybuffer.c

   1 /***************************************************************************
   2  *   Copyright (C) 2004, 2005 by Dominic Rath                              *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "types.h"
  28 #include "log.h"
  29
  30 #include "binarybuffer.h"
  31
  32 const unsigned char bit_reverse_table256[] =
  33 {
  34   0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
  35   0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
  36   0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
  37   0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
  38   0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
  39   0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
  40   0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
  41   0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
  42   0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
  43   0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
  44   0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
  45   0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
  46   0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
  47   0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
  48   0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
  49   0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
  50 };
  51
  52
  53 u8* buf_cpy(u8 *from, u8 *to, int size)
  54 {
  55         int num_bytes = CEIL(size, 8);
  56         unsigned int i;
  57
  58         if (from == NULL)
  59                 return NULL;
  60
  61         for (i = 0; i < num_bytes; i++)
  62                 to[i] = from[i];
  63
  64         /* mask out bits that don't belong to the buffer */
  65         if (size % 8)
  66         {
  67                 to[size / 8] &= (0xff >> (8 - (size % 8)));
  68         }
  69
  70         return to;
  71 }
  72
  73 int buf_cmp(u8 *buf1, u8 *buf2, int size)
  74 {
  75         int num_bytes = CEIL(size, 8);
  76         int i;
  77
  78         if (!buf1 || !buf2)
  79                 return 1;
  80
  81         for (i = 0; i < num_bytes; i++)
  82         {
  83                 /* last byte */
  84                 /* mask out bits that don't really belong to the buffer if size isn't a multiple of 8 bits */
  85                 if ((size % 8) && (i == num_bytes -1 ))
  86                 {
  87                         if ((buf1[i] & ((1 << (size % 8)) - 1)) != (buf2[i] & ((1 << (size % 8)) - 1)))
  88                                 return 1;
  89                 }
  90                 else
  91                 {
  92                         if (buf1[i] != buf2[i])
  93                                 return 1;
  94                 }
  95         }
  96
  97         return 0;
  98 }
  99
 100 int buf_cmp_mask(u8 *buf1, u8 *buf2, u8 *mask, int size)
 101 {
 102         int num_bytes = CEIL(size, 8);
 103         int i;
 104
 105         for (i = 0; i < num_bytes; i++)
 106         {
 107                 /* last byte */
 108                 /* mask out bits that don't really belong to the buffer if size isn't a multiple of 8 bits */
 109                 if ((size % 8) && (i == num_bytes -1 ))
 110                 {
 111                         if ((buf1[i] & ((1 << (size % 8)) - 1) & mask[i]) !=
 112                                 (buf2[i] & ((1 << (size % 8)) - 1) & mask[i]))
 113                                 return 1;
 114                 }
 115                 else
 116                 {
 117                         if ((buf1[i] & mask[i]) != (buf2[i] & mask[i]))
 118                                 return 1;
 119                 }
 120         }
 121
 122         return 0;
 123 }
 124
 125 u8* buf_set_ones(u8 *buf, int count)
 126 {
 127         int num_bytes = CEIL(count, 8);
 128         int i;
 129
 130         for (i = 0; i < num_bytes; i++)
 131         {
 132                 if (count >= 8)
 133                         buf[i] = 0xff;
 134                 else
 135                         buf[i] = (1 << count) - 1;
 136
 137                 count -= 8;
 138         }
 139
 140         return buf;
 141 }
 142
 143 u8* buf_set_buf(u8 *src, int src_start, u8 *dst, int dst_start, int len)
 144 {
 145         int src_idx = src_start, dst_idx = dst_start;
 146         int i;
 147
 148         for (i = 0; i < len; i++)
 149         {
 150                 if (((src[src_idx/8] >> (src_idx % 8)) & 1) == 1)
 151                         dst[dst_idx/8] |= 1 << (dst_idx%8);
 152                 else
 153                         dst[dst_idx/8] &= ~(1 << (dst_idx%8));
 154                 dst_idx++;
 155                 src_idx++;
 156         }
 157
 158         return dst;
 159 }
 160
 161 u32 flip_u32(u32 value, unsigned int num)
 162 {
 163         u32 c;
 164
 165         c = (bit_reverse_table256[value & 0xff] << 24) |
 166                 (bit_reverse_table256[(value >> 8) & 0xff] << 16) |
 167                 (bit_reverse_table256[(value >> 16) & 0xff] << 8) |
 168                 (bit_reverse_table256[(value >> 24) & 0xff]);
 169
 170         if (num < 32)
 171                 c = c >> (32 - num);
 172
 173         return c;
 174 }
 175
 176 int ceil_f_to_u32(float x)
 177 {
 178         u32 y;
 179
 180         if (x < 0)      /* return zero for negative numbers */
 181                 return 0;
 182
 183         y = x;  /* cut off fraction */
 184
 185         if ((x - y) > 0.0) /* if there was a fractional part, increase by one */
 186                 y++;
 187
 188         return y;
 189 }
 190
 191 char* buf_to_str(u8 *buf, int buf_len, int radix)
 192 {
 193         const char *DIGITS = "0123456789abcdef";
 194         float factor;
 195         char *str;
 196         int str_len;
 197         int b256_len = CEIL(buf_len, 8);
 198         u32 tmp;
 199
 200         int j; /* base-256 digits */
 201         int i; /* output digits (radix) */
 202
 203         if (radix == 16)
 204         {
 205                 factor = 2.0;   /* log(256) / log(16) = 2.0 */
 206         }
 207         else if (radix == 10)
 208         {
 209                 factor = 2.40824;   /* log(256) / log(10) = 2.40824 */
 210     }
 211         else if (radix == 8)
 212         {
 213                 factor = 2.66667;       /* log(256) / log(8) = 2.66667 */
 214         }
 215         else
 216                 return NULL;
 217
 218         str_len = ceil_f_to_u32(CEIL(buf_len, 8) * factor);
 219         str = calloc(str_len + 1, 1);
 220
 221         for (i = b256_len - 1; i >= 0; i--)
 222     {
 223         tmp = buf[i];
 224         if ((i == (buf_len / 8)) && (buf_len % 8))
 225                 tmp &= (0xff >> (8 - (buf_len % 8)));
 226
 227         for (j = str_len; j > 0; j--)
 228         {
 229             tmp += (u32)str[j-1] * 256;
 230             str[j-1] = (u8)(tmp % radix);
 231             tmp /= radix;
 232         }
 233     }
 234
 235     for (j = 0; j < str_len; j++)
 236                 str[j] = DIGITS[(int)str[j]];
 237
 238         return str;
 239 }
 240
 241 int str_to_buf(char* str, int str_len, u8 *buf, int buf_len, int radix)
 242 {
 243         char *charbuf;
 244         u32 tmp;
 245         float factor;
 246         u8 *b256_buf;
 247         int b256_len;
 248
 249         int j; /* base-256 digits */
 250         int i; /* input digits (ASCII) */
 251
 252         if (radix == 0)
 253         {
 254                 /* identify radix, and skip radix-prefix (0, 0x or 0X) */
 255                 if ((str[0] == '0') && (str[1] && ((str[1] == 'x') || (str[1] == 'X'))))
 256                 {
 257                         radix = 16;
 258                         str += 2;
 259                         str_len -= 2;
 260                 }
 261                 else if ((str[0] == '0') && (str_len != 1))
 262                 {
 263                         radix = 8;
 264                         str += 1;
 265                         str_len -= 1;
 266                 }
 267                 else
 268                 {
 269                         radix = 10;
 270                 }
 271         }
 272
 273         if (radix == 16)
 274                 factor = 0.5; /* log(16) / log(256) = 0.5 */
 275         else if (radix == 10)
 276                 factor = 0.41524; /* log(10) / log(256) = 0.41524 */
 277         else if (radix == 8)
 278                 factor = 0.375; /* log(8) / log(256) = 0.375 */
 279         else
 280                 return 0;
 281
 282         /* copy to zero-terminated buffer */
 283         charbuf = malloc(str_len + 1);
 284         memcpy(charbuf, str, str_len);
 285         charbuf[str_len] = '\0';
 286
 287         /* number of digits in base-256 notation */
 288         b256_len = ceil_f_to_u32(str_len * factor);
 289         b256_buf = calloc(b256_len, 1);
 290
 291         /* go through zero terminated buffer */
 292         for (i = 0; charbuf[i]; i++)
 293         {
 294                 tmp = charbuf[i];
 295         if ((tmp >= '0') && (tmp <= '9'))
 296                 tmp = (tmp - '0');
 297         else if ((tmp >= 'a') && (tmp <= 'f'))
 298                 tmp = (tmp - 'a' + 10);
 299         else if ((tmp >= 'A') && (tmp <= 'F'))
 300                 tmp = (tmp - 'A' + 10);
 301         else continue;  /* skip characters other than [0-9,a-f,A-F] */
 302
 303                 if (tmp >= radix)
 304                         continue;       /* skip digits invalid for the current radix */
 305
 306                 for (j = 0; j < b256_len; j++)
 307         {
 308             tmp += (u32)b256_buf[j] * radix;
 309             b256_buf[j] = (u8)(tmp & 0xFF);
 310             tmp >>= 8;
 311         }
 312
 313         }
 314
 315         for (j = 0; j < CEIL(buf_len, 8); j++)
 316         {
 317                 if (j < b256_len)
 318                         buf[j] = b256_buf[j];
 319                 else
 320                         buf[j] = 0;
 321         }
 322
 323         /* mask out bits that don't belong to the buffer */
 324         if (buf_len % 8)
 325                 buf[(buf_len / 8)] &= 0xff >> (8 - (buf_len % 8));
 326
 327         free(b256_buf);
 328         free(charbuf);
 329
 330         return i;
 331 }
 332
 333 int buf_to_u32_handler(u8 *in_buf, void *priv, struct scan_field_s *field)
 334 {
 335         u32 *dest = priv;
 336
 337         *dest = buf_get_u32(in_buf, 0, 32);
 338
 339         return ERROR_OK;
 340 }