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 int buf_set_u32(u8* buffer, unsigned int first, unsigned int num, u32 value);
  33 u32 buf_get_u32(u8* buffer, unsigned int first, unsigned int num);
  34 u32 flip_u32(u32 value, unsigned int num);
  35
  36 const unsigned char bit_reverse_table256[] =
  37 {
  38   0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
  39   0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
  40   0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
  41   0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
  42   0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
  43   0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
  44   0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
  45   0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
  46   0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
  47   0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
  48   0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
  49   0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
  50   0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
  51   0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
  52   0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
  53   0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
  54 };
  55
  56 int buf_set_u32(u8* buffer, unsigned int first, unsigned int num, u32 value)
  57 {
  58         unsigned int i;
  59
  60         if (!buffer)
  61                 return ERROR_INVALID_ARGUMENTS;
  62
  63         for (i=first; i<first+num; i++)
  64         {
  65                 if (((value >> (i-first))&1) == 1)
  66                         buffer[i/8] |= 1 << (i%8);
  67                 else
  68                         buffer[i/8] &= ~(1 << (i%8));
  69         }
  70
  71         return ERROR_OK;
  72 }
  73
  74 u32 buf_get_u32(u8* buffer, unsigned int first, unsigned int num)
  75 {
  76         u32 result = 0;
  77         unsigned int i;
  78
  79         if (!buffer)
  80         {
  81                 LOG_ERROR("buffer not initialized");
  82                 return 0;
  83         }
  84
  85         for (i=first; i<first+num; i++)
  86         {
  87                 if (((buffer[i/8]>>(i%8))&1) == 1)
  88                         result |= 1 << (i-first);
  89         }
  90
  91         return result;
  92 }
  93
  94 u8* buf_cpy(u8 *from, u8 *to, int size)
  95 {
  96         int num_bytes = CEIL(size, 8);
  97         unsigned int i;
  98
  99         if (from == NULL)
 100                 return NULL;
 101
 102         for (i = 0; i < num_bytes; i++)
 103                 to[i] = from[i];
 104
 105         /* mask out bits that don't belong to the buffer */
 106         if (size % 8)
 107         {
 108                 to[size / 8] &= (0xff >> (8 - (size % 8)));
 109         }
 110
 111         return to;
 112 }
 113
 114 int buf_cmp(u8 *buf1, u8 *buf2, int size)
 115 {
 116         int num_bytes = CEIL(size, 8);
 117         int i;
 118
 119         if (!buf1 || !buf2)
 120                 return 1;
 121
 122         for (i = 0; i < num_bytes; i++)
 123         {
 124                 /* last byte */
 125                 /* mask out bits that don't really belong to the buffer if size isn't a multiple of 8 bits */
 126                 if ((size % 8) && (i == num_bytes -1 ))
 127                 {
 128                         if ((buf1[i] & ((1 << (size % 8)) - 1)) != (buf2[i] & ((1 << (size % 8)) - 1)))
 129                                 return 1;
 130                 }
 131                 else
 132                 {
 133                         if (buf1[i] != buf2[i])
 134                                 return 1;
 135                 }
 136         }
 137
 138         return 0;
 139 }
 140
 141 int buf_cmp_mask(u8 *buf1, u8 *buf2, u8 *mask, int size)
 142 {
 143         int num_bytes = CEIL(size, 8);
 144         int i;
 145
 146         for (i = 0; i < num_bytes; i++)
 147         {
 148                 /* last byte */
 149                 /* mask out bits that don't really belong to the buffer if size isn't a multiple of 8 bits */
 150                 if ((size % 8) && (i == num_bytes -1 ))
 151                 {
 152                         if ((buf1[i] & ((1 << (size % 8)) - 1) & mask[i]) !=
 153                                 (buf2[i] & ((1 << (size % 8)) - 1) & mask[i]))
 154                                 return 1;
 155                 }
 156                 else
 157                 {
 158                         if ((buf1[i] & mask[i]) != (buf2[i] & mask[i]))
 159                                 return 1;
 160                 }
 161         }
 162
 163         return 0;
 164 }
 165
 166 u8* buf_set_ones(u8 *buf, int count)
 167 {
 168         int num_bytes = CEIL(count, 8);
 169         int i;
 170
 171         for (i = 0; i < num_bytes; i++)
 172         {
 173                 if (count >= 8)
 174                         buf[i] = 0xff;
 175                 else
 176                         buf[i] = (1 << count) - 1;
 177
 178                 count -= 8;
 179         }
 180
 181         return buf;
 182 }
 183
 184 u8* buf_set_buf(u8 *src, int src_start, u8 *dst, int dst_start, int len)
 185 {
 186         int src_idx = src_start, dst_idx = dst_start;
 187         int i;
 188
 189         for (i = 0; i < len; i++)
 190         {
 191                 if (((src[src_idx/8] >> (src_idx % 8)) & 1) == 1)
 192                         dst[dst_idx/8] |= 1 << (dst_idx%8);
 193                 else
 194                         dst[dst_idx/8] &= ~(1 << (dst_idx%8));
 195                 dst_idx++;
 196                 src_idx++;
 197         }
 198
 199         return dst;
 200 }
 201
 202 u32 flip_u32(u32 value, unsigned int num)
 203 {
 204         u32 c;
 205
 206         c = (bit_reverse_table256[value & 0xff] << 24) |
 207                 (bit_reverse_table256[(value >> 8) & 0xff] << 16) |
 208                 (bit_reverse_table256[(value >> 16) & 0xff] << 8) |
 209                 (bit_reverse_table256[(value >> 24) & 0xff]);
 210
 211         if (num < 32)
 212                 c = c >> (32 - num);
 213
 214         return c;
 215 }
 216
 217 int ceil_f_to_u32(float x)
 218 {
 219         u32 y;
 220
 221         if (x < 0)      /* return zero for negative numbers */
 222                 return 0;
 223
 224         y = x;  /* cut off fraction */
 225
 226         if ((x - y) > 0.0) /* if there was a fractional part, increase by one */
 227                 y++;
 228
 229         return y;
 230 }
 231
 232 char* buf_to_str(u8 *buf, int buf_len, int radix)
 233 {
 234         const char *DIGITS = "0123456789abcdef";
 235         float factor;
 236         char *str;
 237         int str_len;
 238         int b256_len = CEIL(buf_len, 8);
 239         u32 tmp;
 240
 241         int j; /* base-256 digits */
 242         int i; /* output digits (radix) */
 243
 244         if (radix == 16)
 245         {
 246                 factor = 2.0;   /* log(256) / log(16) = 2.0 */
 247         }
 248         else if (radix == 10)
 249         {
 250                 factor = 2.40824;   /* log(256) / log(10) = 2.40824 */
 251     }
 252         else if (radix == 8)
 253         {
 254                 factor = 2.66667;       /* log(256) / log(8) = 2.66667 */
 255         }
 256         else
 257                 return NULL;
 258
 259         str_len = ceil_f_to_u32(CEIL(buf_len, 8) * factor);
 260         str = calloc(str_len + 1, 1);
 261
 262         for (i = b256_len - 1; i >= 0; i--)
 263     {
 264         tmp = buf[i];
 265         if ((i == (buf_len / 8)) && (buf_len % 8))
 266                 tmp &= (0xff >> (8 - (buf_len % 8)));
 267
 268         for (j = str_len; j > 0; j--)
 269         {
 270             tmp += (u32)str[j-1] * 256;
 271             str[j-1] = (u8)(tmp % radix);
 272             tmp /= radix;
 273         }
 274     }
 275
 276     for (j = 0; j < str_len; j++)
 277                 str[j] = DIGITS[(int)str[j]];
 278
 279         return str;
 280 }
 281
 282 int str_to_buf(char* str, int str_len, u8 *buf, int buf_len, int radix)
 283 {
 284         char *charbuf;
 285         u32 tmp;
 286         float factor;
 287         u8 *b256_buf;
 288         int b256_len;
 289
 290         int j; /* base-256 digits */
 291         int i; /* input digits (ASCII) */
 292
 293         if (radix == 0)
 294         {
 295                 /* identify radix, and skip radix-prefix (0, 0x or 0X) */
 296                 if ((str[0] == '0') && (str[1] && ((str[1] == 'x') || (str[1] == 'X'))))
 297                 {
 298                         radix = 16;
 299                         str += 2;
 300                         str_len -= 2;
 301                 }
 302                 else if ((str[0] == '0') && (str_len != 1))
 303                 {
 304                         radix = 8;
 305                         str += 1;
 306                         str_len -= 1;
 307                 }
 308                 else
 309                 {
 310                         radix = 10;
 311                 }
 312         }
 313
 314         if (radix == 16)
 315                 factor = 0.5; /* log(16) / log(256) = 0.5 */
 316         else if (radix == 10)
 317                 factor = 0.41524; /* log(10) / log(256) = 0.41524 */
 318         else if (radix == 8)
 319                 factor = 0.375; /* log(8) / log(256) = 0.375 */
 320         else
 321                 return 0;
 322
 323         /* copy to zero-terminated buffer */
 324         charbuf = malloc(str_len + 1);
 325         memcpy(charbuf, str, str_len);
 326         charbuf[str_len] = '\0';
 327
 328         /* number of digits in base-256 notation */
 329         b256_len = ceil_f_to_u32(str_len * factor);
 330         b256_buf = calloc(b256_len, 1);
 331
 332         /* go through zero terminated buffer */
 333         for (i = 0; charbuf[i]; i++)
 334         {
 335                 tmp = charbuf[i];
 336         if ((tmp >= '0') && (tmp <= '9'))
 337                 tmp = (tmp - '0');
 338         else if ((tmp >= 'a') && (tmp <= 'f'))
 339                 tmp = (tmp - 'a' + 10);
 340         else if ((tmp >= 'A') && (tmp <= 'F'))
 341                 tmp = (tmp - 'A' + 10);
 342         else continue;  /* skip characters other than [0-9,a-f,A-F] */
 343
 344                 if (tmp >= radix)
 345                         continue;       /* skip digits invalid for the current radix */
 346
 347                 for (j = 0; j < b256_len; j++)
 348         {
 349             tmp += (u32)b256_buf[j] * radix;
 350             b256_buf[j] = (u8)(tmp & 0xFF);
 351             tmp >>= 8;
 352         }
 353
 354         }
 355
 356         for (j = 0; j < CEIL(buf_len, 8); j++)
 357         {
 358                 if (j < b256_len)
 359                         buf[j] = b256_buf[j];
 360                 else
 361                         buf[j] = 0;
 362         }
 363
 364         /* mask out bits that don't belong to the buffer */
 365         if (buf_len % 8)
 366                 buf[(buf_len / 8)] &= 0xff >> (8 - (buf_len % 8));
 367
 368         free(b256_buf);
 369         free(charbuf);
 370
 371         return i;
 372 }
 373
 374 int buf_to_u32_handler(u8 *in_buf, void *priv, struct scan_field_s *field)
 375 {
 376         u32 *dest = priv;
 377
 378         *dest = buf_get_u32(in_buf, 0, 32);
 379
 380         return ERROR_OK;
 381 }