src/helper/binarybuffer.c

   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 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include "log.h"
  28 #include "binarybuffer.h"
  29
  30 const unsigned char bit_reverse_table256[] =
  31 {
  32   0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
  33   0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
  34   0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
  35   0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
  36   0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
  37   0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
  38   0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
  39   0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
  40   0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
  41   0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
  42   0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
  43   0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
  44   0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
  45   0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
  46   0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
  47   0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
  48 };
  49
  50
  51 uint8_t* buf_cpy(const uint8_t *from, uint8_t *to, int size)
  52 {
  53         unsigned int num_bytes = CEIL(size, 8);
  54         unsigned int i;
  55
  56         if (from == NULL)
  57                 return NULL;
  58
  59         for (i = 0; i < num_bytes; i++)
  60                 to[i] = from[i];
  61
  62         /* mask out bits that don't belong to the buffer */
  63         if (size % 8)
  64         {
  65                 to[size / 8] &= (0xff >> (8 - (size % 8)));
  66         }
  67
  68         return to;
  69 }
  70
  71 int buf_cmp(const uint8_t *buf1, const uint8_t *buf2, int size)
  72 {
  73         int num_bytes = CEIL(size, 8);
  74         int i;
  75
  76         if (!buf1 || !buf2)
  77                 return 1;
  78
  79         for (i = 0; i < num_bytes; i++)
  80         {
  81                 /* last byte */
  82                 /* mask out bits that don't really belong to the buffer if size isn't a multiple of 8 bits */
  83                 if ((size % 8) && (i == num_bytes -1))
  84                 {
  85                         if ((buf1[i] & ((1 << (size % 8)) - 1)) != (buf2[i] & ((1 << (size % 8)) - 1)))
  86                                 return 1;
  87                 }
  88                 else
  89                 {
  90                         if (buf1[i] != buf2[i])
  91                                 return 1;
  92                 }
  93         }
  94
  95         return 0;
  96 }
  97
  98 int buf_cmp_mask(const uint8_t *buf1, const uint8_t *buf2, const uint8_t *mask, int size)
  99 {
 100         int num_bytes = CEIL(size, 8);
 101         int i;
 102
 103         for (i = 0; i < num_bytes; i++)
 104         {
 105                 /* last byte */
 106                 /* mask out bits that don't really belong to the buffer if size isn't a multiple of 8 bits */
 107                 if ((size % 8) && (i == num_bytes -1))
 108                 {
 109                         if ((buf1[i] & ((1 << (size % 8)) - 1) & mask[i]) !=
 110                                 (buf2[i] & ((1 << (size % 8)) - 1) & mask[i]))
 111                                 return 1;
 112                 }
 113                 else
 114                 {
 115                         if ((buf1[i] & mask[i]) != (buf2[i] & mask[i]))
 116                                 return 1;
 117                 }
 118         }
 119
 120         return 0;
 121 }
 122
 123 uint8_t* buf_set_ones(uint8_t *buf, int count)
 124 {
 125         int num_bytes = CEIL(count, 8);
 126         int i;
 127
 128         for (i = 0; i < num_bytes; i++)
 129         {
 130                 if (count >= 8)
 131                         buf[i] = 0xff;
 132                 else
 133                         buf[i] = (1 << count) - 1;
 134
 135                 count -= 8;
 136         }
 137
 138         return buf;
 139 }
 140
 141 uint8_t* buf_set_buf(const uint8_t *src, int src_start, uint8_t *dst, int dst_start, int len)
 142 {
 143         int src_idx = src_start, dst_idx = dst_start;
 144         int i;
 145
 146         for (i = 0; i < len; i++)
 147         {
 148                 if (((src[src_idx/8] >> (src_idx % 8)) & 1) == 1)
 149                         dst[dst_idx/8] |= 1 << (dst_idx%8);
 150                 else
 151                         dst[dst_idx/8] &= ~(1 << (dst_idx%8));
 152                 dst_idx++;
 153                 src_idx++;
 154         }
 155
 156         return dst;
 157 }
 158
 159 uint32_t flip_u32(uint32_t value, unsigned int num)
 160 {
 161         uint32_t c;
 162
 163         c = (bit_reverse_table256[value & 0xff] << 24) |
 164                 (bit_reverse_table256[(value >> 8) & 0xff] << 16) |
 165                 (bit_reverse_table256[(value >> 16) & 0xff] << 8) |
 166                 (bit_reverse_table256[(value >> 24) & 0xff]);
 167
 168         if (num < 32)
 169                 c = c >> (32 - num);
 170
 171         return c;
 172 }
 173
 174 int ceil_f_to_u32(float x)
 175 {
 176         uint32_t y;
 177
 178         if (x < 0)      /* return zero for negative numbers */
 179                 return 0;
 180
 181         y = x;  /* cut off fraction */
 182
 183         if ((x - y) > 0.0) /* if there was a fractional part, increase by one */
 184                 y++;
 185
 186         return y;
 187 }
 188
 189 char* buf_to_str(const uint8_t *buf, int buf_len, int radix)
 190 {
 191         const char *DIGITS = "0123456789ABCDEF";
 192         float factor;
 193         char *str;
 194         int str_len;
 195         int b256_len = CEIL(buf_len, 8);
 196         uint32_t tmp;
 197
 198         int j; /* base-256 digits */
 199         int i; /* output digits (radix) */
 200
 201         if (radix == 16)
 202         {
 203                 factor = 2.0;   /* log(256) / log(16) = 2.0 */
 204         }
 205         else if (radix == 10)
 206         {
 207                 factor = 2.40824;   /* log(256) / log(10) = 2.40824 */
 208         }
 209         else if (radix == 8)
 210         {
 211                 factor = 2.66667;       /* log(256) / log(8) = 2.66667 */
 212         }
 213         else
 214                 return NULL;
 215
 216         str_len = ceil_f_to_u32(CEIL(buf_len, 8) * factor);
 217         str = calloc(str_len + 1, 1);
 218
 219         for (i = b256_len - 1; i >= 0; i--)
 220         {
 221                 tmp = buf[i];
 222                 if ((i == (buf_len / 8)) && (buf_len % 8))
 223                         tmp &= (0xff >> (8 - (buf_len % 8)));
 224
 225                 for (j = str_len; j > 0; j--)
 226                 {
 227                         tmp += (uint32_t)str[j-1] * 256;
 228                         str[j-1] = (uint8_t)(tmp % radix);
 229                         tmp /= radix;
 230                 }
 231         }
 232
 233         for (j = 0; j < str_len; j++)
 234                 str[j] = DIGITS[(int)str[j]];
 235
 236         return str;
 237 }
 238
 239 int str_to_buf(const char *str, int str_len, uint8_t *buf, int buf_len, int radix)
 240 {
 241         char *charbuf;
 242         uint32_t tmp;
 243         float factor;
 244         uint8_t *b256_buf;
 245         int b256_len;
 246
 247         int j; /* base-256 digits */
 248         int i; /* input digits (ASCII) */
 249
 250         if (radix == 0)
 251         {
 252                 /* identify radix, and skip radix-prefix (0, 0x or 0X) */
 253                 if ((str[0] == '0') && (str[1] && ((str[1] == 'x') || (str[1] == 'X'))))
 254                 {
 255                         radix = 16;
 256                         str += 2;
 257                         str_len -= 2;
 258                 }
 259                 else if ((str[0] == '0') && (str_len != 1))
 260                 {
 261                         radix = 8;
 262                         str += 1;
 263                         str_len -= 1;
 264                 }
 265                 else
 266                 {
 267                         radix = 10;
 268                 }
 269         }
 270
 271         if (radix == 16)
 272                 factor = 0.5; /* log(16) / log(256) = 0.5 */
 273         else if (radix == 10)
 274                 factor = 0.41524; /* log(10) / log(256) = 0.41524 */
 275         else if (radix == 8)
 276                 factor = 0.375; /* log(8) / log(256) = 0.375 */
 277         else
 278                 return 0;
 279
 280         /* copy to zero-terminated buffer */
 281         charbuf = malloc(str_len + 1);
 282         memcpy(charbuf, str, str_len);
 283         charbuf[str_len] = '\0';
 284
 285         /* number of digits in base-256 notation */
 286         b256_len = ceil_f_to_u32(str_len * factor);
 287         b256_buf = calloc(b256_len, 1);
 288
 289         /* go through zero terminated buffer */
 290         for (i = 0; charbuf[i]; i++)
 291         {
 292                 tmp = charbuf[i];
 293                 if ((tmp >= '0') && (tmp <= '9'))
 294                         tmp = (tmp - '0');
 295                 else if ((tmp >= 'a') && (tmp <= 'f'))
 296                         tmp = (tmp - 'a' + 10);
 297                 else if ((tmp >= 'A') && (tmp <= 'F'))
 298                         tmp = (tmp - 'A' + 10);
 299                 else continue;  /* skip characters other than [0-9,a-f,A-F] */
 300
 301                 if (tmp >= (uint32_t)radix)
 302                         continue;       /* skip digits invalid for the current radix */
 303
 304                 for (j = 0; j < b256_len; j++)
 305                 {
 306                         tmp += (uint32_t)b256_buf[j] * radix;
 307                         b256_buf[j] = (uint8_t)(tmp & 0xFF);
 308                         tmp >>= 8;
 309                 }
 310
 311         }
 312
 313         for (j = 0; j < CEIL(buf_len, 8); j++)
 314         {
 315                 if (j < b256_len)
 316                         buf[j] = b256_buf[j];
 317                 else
 318                         buf[j] = 0;
 319         }
 320
 321         /* mask out bits that don't belong to the buffer */
 322         if (buf_len % 8)
 323                 buf[(buf_len / 8)] &= 0xff >> (8 - (buf_len % 8));
 324
 325         free(b256_buf);
 326         free(charbuf);
 327
 328         return i;
 329 }
 330
 331 int buf_to_u32_handler(uint8_t *in_buf, void *priv, struct scan_field_s *field)
 332 {
 333         uint32_t *dest = priv;
 334
 335         *dest = buf_get_u32(in_buf, 0, 32);
 336
 337         return ERROR_OK;
 338 }