Mercurial > public > ostc4
annotate ostc4pack/src/OSTC4pack_V4.cpp @ 677:1953cd9145b3 Betatest
Move include file to common to ...
... get things compiled. The configuration.h file is also used from the RTE
code, so it should be in the Common tree.
Signed-off-by: Jan Mulder <jan@jlmulder.nl>
| author | Jan Mulder <jan@jlmulder.nl> |
|---|---|
| date | Wed, 20 Apr 2022 20:25:04 +0200 |
| parents | ad98da7e74f8 |
| children | 01f40cb1057e |
| rev | line source |
|---|---|
| 49 | 1 #include <iostream> |
| 2 | |
| 3 /* run this program using the console pauser or add your own getch, system("pause") or input loop */ | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 #include <stdlib.h> | |
| 9 | |
| 10 /******************************************************************************/ | |
| 11 /* Start of crcmodel.h */ | |
| 12 /******************************************************************************/ | |
| 13 /* */ | |
| 14 /* Author : Ross Williams (ross@guest.adelaide.edu.au.). */ | |
| 15 /* Date : 3 June 1993. */ | |
| 16 /* Status : Public domain. */ | |
| 17 /* */ | |
| 18 /* Description : This is the header (.h) file for the reference */ | |
| 19 /* implementation of the Rocksoft^tm Model CRC Algorithm. For more */ | |
| 20 /* information on the Rocksoft^tm Model CRC Algorithm, see the document */ | |
| 21 /* titled "A Painless Guide to CRC Error Detection Algorithms" by Ross */ | |
| 22 /* Williams (ross@guest.adelaide.edu.au.). This document is likely to be in */ | |
| 23 /* "ftp.adelaide.edu.au/pub/rocksoft". */ | |
| 24 /* */ | |
| 25 /* Note: Rocksoft is a trademark of Rocksoft Pty Ltd, Adelaide, Australia. */ | |
| 26 /* */ | |
| 27 /******************************************************************************/ | |
| 28 /* */ | |
| 29 /* How to Use This Package */ | |
| 30 /* ----------------------- */ | |
| 31 /* Step 1: Declare a variable of type cm_t. Declare another variable */ | |
| 32 /* (p_cm say) of type p_cm_t and initialize it to point to the first */ | |
| 33 /* variable (e.g. p_cm_t p_cm = &cm_t). */ | |
| 34 /* */ | |
| 35 /* Step 2: Assign values to the parameter fields of the structure. */ | |
| 36 /* If you don't know what to assign, see the document cited earlier. */ | |
| 37 /* For example: */ | |
| 38 /* p_cm->cm_width = 16; */ | |
| 39 /* p_cm->cm_poly = 0x8005L; */ | |
| 40 /* p_cm->cm_init = 0L; */ | |
| 41 /* p_cm->cm_refin = TRUE; */ | |
| 42 /* p_cm->cm_refot = TRUE; */ | |
| 43 /* p_cm->cm_xorot = 0L; */ | |
| 44 /* Note: Poly is specified without its top bit (18005 becomes 8005). */ | |
| 45 /* Note: Width is one bit less than the raw poly width. */ | |
| 46 /* */ | |
| 47 /* Step 3: Initialize the instance with a call cm_ini(p_cm); */ | |
| 48 /* */ | |
| 49 /* Step 4: Process zero or more message bytes by placing zero or more */ | |
| 50 /* successive calls to cm_nxt. Example: cm_nxt(p_cm,ch); */ | |
| 51 /* */ | |
| 52 /* Step 5: Extract the CRC value at any time by calling crc = cm_crc(p_cm); */ | |
| 53 /* If the CRC is a 16-bit value, it will be in the bottom 16 bits. */ | |
| 54 /* */ | |
| 55 /******************************************************************************/ | |
| 56 /* */ | |
| 57 /* Design Notes */ | |
| 58 /* ------------ */ | |
| 59 /* PORTABILITY: This package has been coded very conservatively so that */ | |
| 60 /* it will run on as many machines as possible. For example, all external */ | |
| 61 /* identifiers have been restricted to 6 characters and all internal ones to */ | |
| 62 /* 8 characters. The prefix cm (for Crc Model) is used as an attempt to avoid */ | |
| 63 /* namespace collisions. This package is endian independent. */ | |
| 64 /* */ | |
| 65 /* EFFICIENCY: This package (and its interface) is not designed for */ | |
| 66 /* speed. The purpose of this package is to act as a well-defined reference */ | |
| 67 /* model for the specification of CRC algorithms. If you want speed, cook up */ | |
| 68 /* a specific table-driven implementation as described in the document cited */ | |
| 69 /* above. This package is designed for validation only; if you have found or */ | |
| 70 /* implemented a CRC algorithm and wish to describe it as a set of parameters */ | |
| 71 /* to the Rocksoft^tm Model CRC Algorithm, your CRC algorithm implementation */ | |
| 72 /* should behave identically to this package under those parameters. */ | |
| 73 /* */ | |
| 74 /******************************************************************************/ | |
| 75 | |
| 76 /* The following #ifndef encloses this entire */ | |
| 77 /* header file, rendering it indempotent. */ | |
| 78 #ifndef CM_DONE | |
| 79 #define CM_DONE | |
| 80 | |
| 81 /******************************************************************************/ | |
| 82 | |
| 83 /* The following definitions are extracted from my style header file which */ | |
| 84 /* would be cumbersome to distribute with this package. The DONE_STYLE is the */ | |
| 85 /* idempotence symbol used in my style header file. */ | |
| 86 | |
| 87 #ifndef DONE_STYLE | |
| 88 | |
| 89 typedef unsigned long ulong; | |
| 90 typedef unsigned char * p_ubyte_; | |
| 91 | |
| 92 #ifndef TRUE | |
| 93 #define FALSE 0 | |
| 94 #define TRUE 1 | |
| 95 #endif | |
| 96 | |
| 97 /* Change to the second definition if you don't have prototypes. */ | |
| 98 #define P_(A) A | |
| 99 /* #define P_(A) () */ | |
| 100 | |
| 101 /* Uncomment this definition if you don't have void. */ | |
| 102 /* typedef int void; */ | |
| 103 | |
| 104 #endif | |
| 105 | |
| 106 /******************************************************************************/ | |
| 107 | |
| 108 /* CRC Model Abstract Type */ | |
| 109 /* ----------------------- */ | |
| 110 /* The following type stores the context of an executing instance of the */ | |
| 111 /* model algorithm. Most of the fields are model parameters which must be */ | |
| 112 /* set before the first initializing call to cm_ini. */ | |
| 113 typedef struct | |
| 114 { | |
| 115 int cm_width; /* Parameter: Width in bits [8,32]. */ | |
| 116 ulong cm_poly; /* Parameter: The algorithm's polynomial. */ | |
| 117 ulong cm_init; /* Parameter: Initial register value. */ | |
| 118 bool cm_refin; /* Parameter: Reflect input bytes? */ | |
| 119 bool cm_refot; /* Parameter: Reflect output CRC? */ | |
| 120 ulong cm_xorot; /* Parameter: XOR this to output CRC. */ | |
| 121 | |
| 122 ulong cm_reg; /* Context: Context during execution. */ | |
| 123 } cm_t; | |
| 124 typedef cm_t *p_cm_t; | |
| 125 | |
| 126 /******************************************************************************/ | |
| 127 | |
| 128 /* Functions That Implement The Model */ | |
| 129 /* ---------------------------------- */ | |
| 130 /* The following functions animate the cm_t abstraction. */ | |
| 131 | |
| 132 void cm_ini P_((p_cm_t p_cm)); | |
| 133 /* Initializes the argument CRC model instance. */ | |
| 134 /* All parameter fields must be set before calling this. */ | |
| 135 | |
| 136 void cm_nxt P_((p_cm_t p_cm,int ch)); | |
| 137 /* Processes a single message byte [0,255]. */ | |
| 138 | |
| 139 void cm_blk P_((p_cm_t p_cm,p_ubyte_ blk_adr,ulong blk_len)); | |
| 140 /* Processes a block of message bytes. */ | |
| 141 | |
| 142 ulong cm_crc P_((p_cm_t p_cm)); | |
| 143 /* Returns the CRC value for the message bytes processed so far. */ | |
| 144 | |
| 145 /******************************************************************************/ | |
| 146 | |
| 147 /* Functions For Table Calculation */ | |
| 148 /* ------------------------------- */ | |
| 149 /* The following function can be used to calculate a CRC lookup table. */ | |
| 150 /* It can also be used at run-time to create or check static tables. */ | |
| 151 | |
| 152 ulong cm_tab P_((p_cm_t p_cm,int index)); | |
| 153 /* Returns the i'th entry for the lookup table for the specified algorithm. */ | |
| 154 /* The function examines the fields cm_width, cm_poly, cm_refin, and the */ | |
| 155 /* argument table index in the range [0,255] and returns the table entry in */ | |
| 156 /* the bottom cm_width bytes of the return value. */ | |
| 157 | |
| 158 /******************************************************************************/ | |
| 159 | |
| 160 /* End of the header file idempotence #ifndef */ | |
| 161 #endif | |
| 162 | |
| 163 /******************************************************************************/ | |
| 164 /* End of crcmodel.h */ | |
| 165 /******************************************************************************/ | |
| 166 | |
| 167 | |
| 168 /******************************************************************************/ | |
| 169 /* Start of crcmodel.c */ | |
| 170 /******************************************************************************/ | |
| 171 /* */ | |
| 172 /* Author : Ross Williams (ross@guest.adelaide.edu.au.). */ | |
| 173 /* Date : 3 June 1993. */ | |
| 174 /* Status : Public domain. */ | |
| 175 /* */ | |
| 176 /* Description : This is the implementation (.c) file for the reference */ | |
| 177 /* implementation of the Rocksoft^tm Model CRC Algorithm. For more */ | |
| 178 /* information on the Rocksoft^tm Model CRC Algorithm, see the document */ | |
| 179 /* titled "A Painless Guide to CRC Error Detection Algorithms" by Ross */ | |
| 180 /* Williams (ross@guest.adelaide.edu.au.). This document is likely to be in */ | |
| 181 /* "ftp.adelaide.edu.au/pub/rocksoft". */ | |
| 182 /* */ | |
| 183 /* Note: Rocksoft is a trademark of Rocksoft Pty Ltd, Adelaide, Australia. */ | |
| 184 /* */ | |
| 185 /******************************************************************************/ | |
| 186 /* */ | |
| 187 /* Implementation Notes */ | |
| 188 /* -------------------- */ | |
| 189 /* To avoid inconsistencies, the specification of each function is not echoed */ | |
| 190 /* here. See the header file for a description of these functions. */ | |
| 191 /* This package is light on checking because I want to keep it short and */ | |
| 192 /* simple and portable (i.e. it would be too messy to distribute my entire */ | |
| 193 /* C culture (e.g. assertions package) with this package. */ | |
| 194 /* */ | |
| 195 /******************************************************************************/ | |
| 196 | |
| 197 #include "crcmodel.h" | |
| 198 | |
| 199 /******************************************************************************/ | |
| 200 | |
| 201 /* The following definitions make the code more readable. */ | |
| 202 | |
| 203 #define BITMASK(X) (1L << (X)) | |
| 204 #define MASK32 0xFFFFFFFFL | |
| 205 #define LOCAL static | |
| 206 | |
| 207 /******************************************************************************/ | |
| 208 | |
| 209 ulong reflect P_((ulong v,int b)) | |
| 210 { | |
| 211 int i; | |
| 212 ulong t = v; | |
| 213 for (i=0; i<b; i++) | |
| 214 { | |
| 215 if (t & 1L) | |
| 216 v|= BITMASK((b-1)-i); | |
| 217 else | |
| 218 v&= ~BITMASK((b-1)-i); | |
| 219 t>>=1; | |
| 220 } | |
| 221 return v; | |
| 222 } | |
| 223 | |
| 224 /******************************************************************************/ | |
| 225 | |
| 226 LOCAL ulong widmask (p_cm_t p_cm) | |
| 227 { | |
| 228 return (((1L<<(p_cm->cm_width-1))-1L)<<1)|1L; | |
| 229 } | |
| 230 | |
| 231 /******************************************************************************/ | |
| 232 | |
| 233 void cm_ini (p_cm_t p_cm) | |
| 234 { | |
| 235 p_cm->cm_reg = p_cm->cm_init; | |
| 236 } | |
| 237 | |
| 238 /******************************************************************************/ | |
| 239 | |
| 240 void cm_nxt (p_cm_t p_cm,int ch) | |
| 241 { | |
| 242 int i; | |
| 243 ulong uch = (ulong) ch; | |
| 244 ulong topbit = BITMASK(p_cm->cm_width-1); | |
| 245 | |
| 246 if (p_cm->cm_refin) uch = reflect(uch,8); | |
| 247 p_cm->cm_reg ^= (uch << (p_cm->cm_width-8)); | |
| 248 for (i=0; i<8; i++) | |
| 249 { | |
| 250 if (p_cm->cm_reg & topbit) | |
| 251 p_cm->cm_reg = (p_cm->cm_reg << 1) ^ p_cm->cm_poly; | |
| 252 else | |
| 253 p_cm->cm_reg <<= 1; | |
| 254 p_cm->cm_reg &= widmask(p_cm); | |
| 255 } | |
| 256 } | |
| 257 | |
| 258 /******************************************************************************/ | |
| 259 | |
| 260 void cm_blk (p_cm_t p_cm,p_ubyte_ blk_adr,ulong blk_len) | |
| 261 { | |
| 262 while (blk_len--) cm_nxt(p_cm,*blk_adr++); | |
| 263 } | |
| 264 | |
| 265 /******************************************************************************/ | |
| 266 | |
| 267 ulong cm_crc (p_cm_t p_cm) | |
| 268 { | |
| 269 if (p_cm->cm_refot) | |
| 270 return p_cm->cm_xorot ^ reflect(p_cm->cm_reg,p_cm->cm_width); | |
| 271 else | |
| 272 return p_cm->cm_xorot ^ p_cm->cm_reg; | |
| 273 } | |
| 274 | |
| 275 /******************************************************************************/ | |
| 276 | |
| 277 ulong cm_tab (p_cm_t p_cm,int index) | |
| 278 { | |
| 279 int i; | |
| 280 ulong r; | |
| 281 ulong topbit = BITMASK(p_cm->cm_width-1); | |
| 282 ulong inbyte = (ulong) index; | |
| 283 | |
| 284 if (p_cm->cm_refin) inbyte = reflect(inbyte,8); | |
| 285 r = inbyte << (p_cm->cm_width-8); | |
| 286 for (i=0; i<8; i++) | |
| 287 if (r & topbit) | |
| 288 r = (r << 1) ^ p_cm->cm_poly; | |
| 289 else | |
| 290 r<<=1; | |
| 291 if (p_cm->cm_refin) r = reflect(r,p_cm->cm_width); | |
| 292 return r & widmask(p_cm); | |
| 293 } | |
| 294 | |
| 295 /******************************************************************************/ | |
| 296 /* End of crcmodel.c */ | |
| 297 /******************************************************************************/ | |
| 298 | |
| 299 #define uint32_t unsigned int | |
| 300 #define uint8_t unsigned char | |
| 301 | |
| 302 uint32_t CRC_CalcBlockCRC(uint32_t *buffer, uint32_t words) | |
| 303 { | |
| 304 cm_t crc_model; | |
| 305 uint32_t word_to_do; | |
| 306 uint8_t byte_to_do; | |
| 307 int i; | |
| 308 | |
| 309 // Values for the STM32F generator. | |
| 310 | |
| 311 crc_model.cm_width = 32; // 32-bit CRC | |
| 312 crc_model.cm_poly = 0x04C11DB7; // CRC-32 polynomial | |
| 313 crc_model.cm_init = 0xFFFFFFFF; // CRC initialized to 1's | |
| 314 crc_model.cm_refin = FALSE; // CRC calculated MSB first | |
| 315 crc_model.cm_refot = FALSE; // Final result is not bit-reversed | |
| 316 crc_model.cm_xorot = 0x00000000; // Final result XOR'ed with this | |
| 317 | |
| 318 cm_ini(&crc_model); | |
| 319 | |
| 320 while (words--) | |
| 321 { | |
| 322 // The STM32F10x hardware does 32-bit words at a time!!! | |
| 323 | |
| 324 word_to_do = *buffer++; | |
| 325 | |
| 326 // Do all bytes in the 32-bit word. | |
| 327 | |
| 328 for (i = 0; i < sizeof(word_to_do); i++) | |
| 329 { | |
| 330 // We calculate a *byte* at a time. If the CRC is MSB first we | |
| 331 // do the next MS byte and vica-versa. | |
| 332 | |
| 333 if (crc_model.cm_refin == FALSE) | |
| 334 { | |
| 335 // MSB first. Do the next MS byte. | |
| 336 | |
| 337 byte_to_do = (uint8_t) ((word_to_do & 0xFF000000) >> 24); | |
| 338 word_to_do <<= 8; | |
| 339 } | |
| 340 else | |
| 341 { | |
| 342 // LSB first. Do the next LS byte. | |
| 343 | |
| 344 byte_to_do = (uint8_t) (word_to_do & 0x000000FF); | |
| 345 word_to_do >>= 8; | |
| 346 } | |
| 347 | |
| 348 cm_nxt(&crc_model, byte_to_do); | |
| 349 } | |
| 350 } | |
| 351 | |
| 352 // Return the final result. | |
| 353 | |
| 354 return (cm_crc(&crc_model)); | |
| 355 } | |
| 356 | |
| 357 | |
| 358 unsigned checksum(void *buffer, size_t len, unsigned int seed) | |
| 359 { | |
| 360 unsigned char *buf = (unsigned char *)buffer; | |
| 361 size_t i; | |
| 362 | |
| 363 for (i = 0; i < len; ++i) | |
| 364 seed += (unsigned int)(*buf++); | |
| 365 return seed; | |
| 366 } | |
| 367 | |
| 368 unsigned int crc32c_checksum(unsigned char* message, int length) { | |
| 369 int i, j; | |
| 370 unsigned int byte, crc, mask; | |
| 371 static unsigned int table[256] = {0}; | |
| 372 | |
| 373 /* Set up the table, if necessary. */ | |
| 374 | |
| 375 if (table[1] == 0) { | |
| 376 for (byte = 0; byte <= 255; byte++) { | |
| 377 crc = byte; | |
| 378 for (j = 7; j >= 0; j--) { // Do eight times. | |
| 379 mask = -(crc & 1); | |
| 380 crc = (crc >> 1) ^ (0xEDB88320 & mask); | |
| 381 } | |
| 382 table[byte] = crc; | |
| 383 } | |
| 384 } | |
| 385 | |
| 386 /* Through with table setup, now calculate the CRC. */ | |
| 387 i = 0; | |
| 388 crc = 0xFFFFFFFF; | |
| 389 while (length--) { | |
| 390 byte = message[i]; | |
| 391 crc = (crc >> 8) ^ table[(crc ^ byte) & 0xFF]; | |
| 392 i = i + 1; | |
| 393 } | |
| 394 return ~crc; | |
| 395 } | |
| 396 | |
| 397 | |
| 398 | |
| 399 | |
| 400 | |
| 401 | |
| 402 /******************************************************************************/ | |
| 403 | |
| 404 /* MAIN */ | |
| 405 /* ----------------------- */ | |
| 406 /* */ | |
| 407 | |
| 408 | |
| 409 #include <stdio.h> | |
| 410 #include <string.h> | |
| 411 int main(int argc, char** argv) { | |
| 412 | |
| 413 | |
|
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ad98da7e74f8
OSTC4pack_V4: do not hard code output filename for fonts
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parents:
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diff
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414 if (argc != 3) { |
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ad98da7e74f8
OSTC4pack_V4: do not hard code output filename for fonts
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parents:
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changeset
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415 fprintf(stderr, "Usage: OSTC4pack_V4 <type> <bin file>\n"); |
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416 return(-1); |
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ad98da7e74f8
OSTC4pack_V4: do not hard code output filename for fonts
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parents:
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changeset
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417 } |
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ad98da7e74f8
OSTC4pack_V4: do not hard code output filename for fonts
Jan Mulder <jlmulder@xs4all.nl>
parents:
49
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changeset
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418 |
| 49 | 419 FILE *fp, * fpout; |
| 420 size_t len; | |
| 421 unsigned char buf[1050000]; | |
| 422 char *file = argv[2]; | |
| 423 int type = atoi(argv[1]); | |
| 424 unsigned int pruefsumme; | |
| 425 | |
| 426 //write File with length and cheksum | |
| 427 char filename[500], filenameout[510] ; | |
| 428 sprintf(filename,"%s",file); | |
| 429 int filelength = strlen(filename); | |
| 430 filename[filelength -4] = 0; | |
| 431 | |
| 432 if (NULL == (fp = fopen(file, "rb"))) | |
| 433 { | |
| 434 printf("Unable to open %s for reading\n", file); | |
| 435 return -1; | |
| 436 } | |
| 437 len = fread(buf, sizeof(char), sizeof(buf), fp); | |
| 438 printf("%d bytes read (hex: %#x )\n", len,len); | |
| 439 // unsigned int checksum = crc32c_checksum(buf, len); | |
| 440 unsigned int checksum = CRC_CalcBlockCRC((uint32_t *)buf, (uint32_t)(len/4)); | |
| 441 printf("The checksum of %s is %#x\n", file, checksum); | |
| 442 | |
| 443 fclose(fp); | |
| 444 if(type == 0) | |
| 445 sprintf(filenameout,"%s_upload.bin",filename); | |
| 446 else | |
| 447 if(type == 2) | |
|
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OSTC4pack_V4: do not hard code output filename for fonts
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parents:
49
diff
changeset
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448 sprintf(filenameout,"%s_upload.bin",filename); |
| 49 | 449 else |
| 450 sprintf(filenameout,"%s_upload.bin",filename); | |
| 451 | |
| 452 unsigned char buf2[4]; | |
| 453 | |
| 454 buf2[0] = 0xFF & (len >> 24);; | |
| 455 buf2[1] = 0xFF & (len >> 16);; | |
| 456 buf2[2] = 0xFF & (len >> 8); | |
| 457 buf2[3] = 0xFF & len; | |
| 458 fpout = fopen(filenameout, "wb"); | |
| 459 fwrite(buf2,sizeof(char),4,fp); | |
| 460 | |
| 461 | |
| 462 unsigned char buf3offset[4]; | |
| 463 unsigned char bufVersion[4]; | |
| 464 if(type == 2) | |
| 465 { | |
| 466 buf3offset[0] = 0x10; | |
| 467 buf3offset[1] = 0x00; | |
| 468 buf3offset[2] = 0x03; | |
| 469 buf3offset[3] = 0x20; | |
| 470 bufVersion[0] = buf[0x00]; | |
| 471 bufVersion[1] = buf[0x01]; | |
| 472 bufVersion[2] = buf[0x02]; | |
| 473 bufVersion[3] = buf[0x03]; | |
| 474 } | |
| 475 else | |
| 476 if(type == 0) | |
| 477 { | |
| 478 buf3offset[0] = 0xFE; | |
| 479 buf3offset[1] = 'R'; | |
| 480 buf3offset[2] = 'T'; | |
| 481 buf3offset[3] = 'E'; | |
| 482 bufVersion[0] = buf[0x5000]; | |
| 483 bufVersion[1] = buf[0x5001]; | |
| 484 bufVersion[2] = buf[0x5002]; | |
| 485 bufVersion[3] = buf[0x5003]; | |
| 486 } | |
| 487 else | |
| 488 { | |
| 489 buf3offset[0] = 0xFF; | |
| 490 buf3offset[1] = 0; | |
| 491 buf3offset[2] = 'H'; | |
| 492 buf3offset[3] = 'W'; | |
| 493 bufVersion[0] = buf[0x10000]; | |
| 494 bufVersion[1] = buf[0x10001]; | |
| 495 bufVersion[2] = buf[0x10002]; | |
| 496 bufVersion[3] = buf[0x10003]; | |
| 497 } | |
| 498 | |
| 499 fwrite(buf3offset,sizeof(char),4,fp); | |
| 500 | |
| 501 pruefsumme = len + (256*256*256*buf3offset[0]) + (256*256*buf3offset[1]) + (256*buf3offset[2]) + buf3offset[3]; | |
| 502 fwrite(&pruefsumme,sizeof(char),4,fp); | |
| 503 | |
| 504 fwrite(bufVersion,sizeof(char),4,fp); | |
| 505 | |
| 506 for(int i = 0;i <len;i++) | |
| 507 { | |
| 508 if(fwrite(&buf[i],1,1,fpout) != 1) | |
| 509 printf("error writing\n"); | |
| 510 } | |
| 511 | |
| 512 | |
| 513 buf2[0] = 0xFF & (checksum >> 24);// & 0xFF000000; | |
| 514 buf2[1] = 0xFF & (checksum >> 16); | |
| 515 buf2[2] = 0xFF & (checksum >> 8); | |
| 516 buf2[3] = 0xFF & checksum; | |
| 517 | |
| 518 fwrite(buf2,sizeof(char),4,fp); | |
| 519 | |
| 520 } |