symbian/QQrDecoder/zxing/oned/Code128Reader.cpp

   1 /*
   2  *  Code128Reader.cpp
   3  *  ZXing
   4  *
   5  *  Created by Lukasz Warchol on 10-01-15.
   6  *  Copyright 2010 ZXing authors All rights reserved.
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20
  21 #include "Code128Reader.h"
  22 #include <zxing/oned/OneDResultPoint.h>
  23 #include <zxing/common/Array.h>
  24 #include <zxing/ReaderException.h>
  25 #include <math.h>
  26 #include <string.h>
  27
  28 namespace zxing {
  29         namespace oned {
  30
  31                 const int CODE_PATTERNS_LENGHT = 107;
  32                 const int countersLenght = 6;
  33                 static const int CODE_PATTERNS[CODE_PATTERNS_LENGHT][countersLenght] = {
  34                         {2, 1, 2, 2, 2, 2}, /* 0 */
  35                         {2, 2, 2, 1, 2, 2},
  36                         {2, 2, 2, 2, 2, 1},
  37                         {1, 2, 1, 2, 2, 3},
  38                         {1, 2, 1, 3, 2, 2},
  39                         {1, 3, 1, 2, 2, 2}, /* 5 */
  40                         {1, 2, 2, 2, 1, 3},
  41                         {1, 2, 2, 3, 1, 2},
  42                         {1, 3, 2, 2, 1, 2},
  43                         {2, 2, 1, 2, 1, 3},
  44                         {2, 2, 1, 3, 1, 2}, /* 10 */
  45                         {2, 3, 1, 2, 1, 2},
  46                         {1, 1, 2, 2, 3, 2},
  47                         {1, 2, 2, 1, 3, 2},
  48                         {1, 2, 2, 2, 3, 1},
  49                         {1, 1, 3, 2, 2, 2}, /* 15 */
  50                         {1, 2, 3, 1, 2, 2},
  51                         {1, 2, 3, 2, 2, 1},
  52                         {2, 2, 3, 2, 1, 1},
  53                         {2, 2, 1, 1, 3, 2},
  54                         {2, 2, 1, 2, 3, 1}, /* 20 */
  55                         {2, 1, 3, 2, 1, 2},
  56                         {2, 2, 3, 1, 1, 2},
  57                         {3, 1, 2, 1, 3, 1},
  58                         {3, 1, 1, 2, 2, 2},
  59                         {3, 2, 1, 1, 2, 2}, /* 25 */
  60                         {3, 2, 1, 2, 2, 1},
  61                         {3, 1, 2, 2, 1, 2},
  62                         {3, 2, 2, 1, 1, 2},
  63                         {3, 2, 2, 2, 1, 1},
  64                         {2, 1, 2, 1, 2, 3}, /* 30 */
  65                         {2, 1, 2, 3, 2, 1},
  66                         {2, 3, 2, 1, 2, 1},
  67                         {1, 1, 1, 3, 2, 3},
  68                         {1, 3, 1, 1, 2, 3},
  69                         {1, 3, 1, 3, 2, 1}, /* 35 */
  70                         {1, 1, 2, 3, 1, 3},
  71                         {1, 3, 2, 1, 1, 3},
  72                         {1, 3, 2, 3, 1, 1},
  73                         {2, 1, 1, 3, 1, 3},
  74                         {2, 3, 1, 1, 1, 3}, /* 40 */
  75                         {2, 3, 1, 3, 1, 1},
  76                         {1, 1, 2, 1, 3, 3},
  77                         {1, 1, 2, 3, 3, 1},
  78                         {1, 3, 2, 1, 3, 1},
  79                         {1, 1, 3, 1, 2, 3}, /* 45 */
  80                         {1, 1, 3, 3, 2, 1},
  81                         {1, 3, 3, 1, 2, 1},
  82                         {3, 1, 3, 1, 2, 1},
  83                         {2, 1, 1, 3, 3, 1},
  84                         {2, 3, 1, 1, 3, 1}, /* 50 */
  85                         {2, 1, 3, 1, 1, 3},
  86                         {2, 1, 3, 3, 1, 1},
  87                         {2, 1, 3, 1, 3, 1},
  88                         {3, 1, 1, 1, 2, 3},
  89                         {3, 1, 1, 3, 2, 1}, /* 55 */
  90                         {3, 3, 1, 1, 2, 1},
  91                         {3, 1, 2, 1, 1, 3},
  92                         {3, 1, 2, 3, 1, 1},
  93                         {3, 3, 2, 1, 1, 1},
  94                         {3, 1, 4, 1, 1, 1}, /* 60 */
  95                         {2, 2, 1, 4, 1, 1},
  96                         {4, 3, 1, 1, 1, 1},
  97                         {1, 1, 1, 2, 2, 4},
  98                         {1, 1, 1, 4, 2, 2},
  99                         {1, 2, 1, 1, 2, 4}, /* 65 */
 100                         {1, 2, 1, 4, 2, 1},
 101                         {1, 4, 1, 1, 2, 2},
 102                         {1, 4, 1, 2, 2, 1},
 103                         {1, 1, 2, 2, 1, 4},
 104                         {1, 1, 2, 4, 1, 2}, /* 70 */
 105                         {1, 2, 2, 1, 1, 4},
 106                         {1, 2, 2, 4, 1, 1},
 107                         {1, 4, 2, 1, 1, 2},
 108                         {1, 4, 2, 2, 1, 1},
 109                         {2, 4, 1, 2, 1, 1}, /* 75 */
 110                         {2, 2, 1, 1, 1, 4},
 111                         {4, 1, 3, 1, 1, 1},
 112                         {2, 4, 1, 1, 1, 2},
 113                         {1, 3, 4, 1, 1, 1},
 114                         {1, 1, 1, 2, 4, 2}, /* 80 */
 115                         {1, 2, 1, 1, 4, 2},
 116                         {1, 2, 1, 2, 4, 1},
 117                         {1, 1, 4, 2, 1, 2},
 118                         {1, 2, 4, 1, 1, 2},
 119                         {1, 2, 4, 2, 1, 1}, /* 85 */
 120                         {4, 1, 1, 2, 1, 2},
 121                         {4, 2, 1, 1, 1, 2},
 122                         {4, 2, 1, 2, 1, 1},
 123                         {2, 1, 2, 1, 4, 1},
 124                         {2, 1, 4, 1, 2, 1}, /* 90 */
 125                         {4, 1, 2, 1, 2, 1},
 126                         {1, 1, 1, 1, 4, 3},
 127                         {1, 1, 1, 3, 4, 1},
 128                         {1, 3, 1, 1, 4, 1},
 129                         {1, 1, 4, 1, 1, 3}, /* 95 */
 130                         {1, 1, 4, 3, 1, 1},
 131                         {4, 1, 1, 1, 1, 3},
 132                         {4, 1, 1, 3, 1, 1},
 133                         {1, 1, 3, 1, 4, 1},
 134                         {1, 1, 4, 1, 3, 1}, /* 100 */
 135                         {3, 1, 1, 1, 4, 1},
 136                         {4, 1, 1, 1, 3, 1},
 137                         {2, 1, 1, 4, 1, 2},
 138                         {2, 1, 1, 2, 1, 4},
 139                         {2, 1, 1, 2, 3, 2}, /* 105 */
 140                         {2, 3, 3, 1, 1, 1}
 141                 };
 142
 143
 144                 Code128Reader::Code128Reader(){
 145                 }
 146
 147                 int* Code128Reader::findStartPattern(Ref<BitArray> row){
 148                         int width = row->getSize();
 149                         int rowOffset = 0;
 150                         while (rowOffset < width) {
 151                                 if (row->get(rowOffset)) {
 152                                         break;
 153                                 }
 154                                 rowOffset++;
 155                         }
 156
 157                         int counterPosition = 0;
 158                         int counters[countersLenght] = {0,0,0,0,0,0};
 159                         int patternStart = rowOffset;
 160                         bool isWhite = false;
 161                         int patternLength =  sizeof(counters) / sizeof(int);
 162
 163                         for (int i = rowOffset; i < width; i++) {
 164                                 bool pixel = row->get(i);
 165                                 if (pixel ^ isWhite) {
 166                                         counters[counterPosition]++;
 167                                 } else {
 168                                         if (counterPosition == patternLength - 1) {
 169                                                 int bestVariance = MAX_AVG_VARIANCE;
 170                                                 int bestMatch = -1;
 171                                                 for (int startCode = CODE_START_A; startCode <= CODE_START_C; startCode++) {
 172                                                         int variance = patternMatchVariance(counters, sizeof(counters)/sizeof(int), CODE_PATTERNS[startCode], MAX_INDIVIDUAL_VARIANCE);
 173                                                         if (variance < bestVariance) {
 174                                                                 bestVariance = variance;
 175                                                                 bestMatch = startCode;
 176                                                         }
 177                                                 }
 178                                                 if (bestMatch >= 0) {
 179                                                         // Look for whitespace before start pattern, >= 50% of width of start pattern
 180                                                         if (row->isRange(fmaxl(0, patternStart - (i - patternStart) / 2), patternStart, false)) {
 181                                                                 int* resultValue = new int[3];
 182                                                                 resultValue[0] = patternStart;
 183                                                                 resultValue[1] = i;
 184                                                                 resultValue[2] = bestMatch;
 185                                                                 return resultValue;
 186                                                         }
 187                                                 }
 188                                                 patternStart += counters[0] + counters[1];
 189                                                 for (int y = 2; y < patternLength; y++) {
 190                                                         counters[y - 2] = counters[y];
 191                                                 }
 192                                                 counters[patternLength - 2] = 0;
 193                                                 counters[patternLength - 1] = 0;
 194                                                 counterPosition--;
 195                                         } else {
 196                                                 counterPosition++;
 197                                         }
 198                                         counters[counterPosition] = 1;
 199                                         isWhite = !isWhite;
 200                                 }
 201                         }
 202                         throw ReaderException("");
 203                 }
 204
 205                 int Code128Reader::decodeCode(Ref<BitArray> row, int counters[], int countersCount, int rowOffset){
 206                         recordPattern(row, rowOffset, counters, countersCount);
 207                         int bestVariance = MAX_AVG_VARIANCE; // worst variance we'll accept
 208                         int bestMatch = -1;
 209                         for (int d = 0; d < CODE_PATTERNS_LENGHT; d++) {
 210                                 int pattern[countersLenght];
 211
 212                                 for(int ind = 0; ind< countersLenght; ind++){
 213                                         pattern[ind] = CODE_PATTERNS[d][ind];
 214                                 }
 215 //                              memcpy(pattern, CODE_PATTERNS[d], countersLenght);
 216                                 int variance = patternMatchVariance(counters, countersCount, pattern, MAX_INDIVIDUAL_VARIANCE);
 217                                 if (variance < bestVariance) {
 218                                         bestVariance = variance;
 219                                         bestMatch = d;
 220                                 }
 221                         }
 222                         // TODO We're overlooking the fact that the STOP pattern has 7 values, not 6.
 223                         if (bestMatch >= 0) {
 224                                 return bestMatch;
 225                         } else {
 226                                 throw ReaderException("");
 227                         }
 228                 }
 229
 230                 Ref<Result> Code128Reader::decodeRow(int rowNumber, Ref<BitArray> row){
 231
 232                         int* startPatternInfo = findStartPattern(row);
 233                         int startCode = startPatternInfo[2];
 234                         int codeSet;
 235                         switch (startCode) {
 236                                 case CODE_START_A:
 237                                         codeSet = CODE_CODE_A;
 238                                         break;
 239                                 case CODE_START_B:
 240                                         codeSet = CODE_CODE_B;
 241                                         break;
 242                                 case CODE_START_C:
 243                                         codeSet = CODE_CODE_C;
 244                                         break;
 245                                 default:
 246                                         throw ReaderException("");
 247                         }
 248
 249                         bool done = false;
 250                         bool isNextShifted = false;
 251
 252                         std::string tmpResultString;
 253
 254
 255                         int lastStart = startPatternInfo[0];
 256                         int nextStart = startPatternInfo[1];
 257                         int counters[countersLenght] = {0,0,0,0,0,0};
 258
 259                         int lastCode = 0;
 260                         int code = 0;
 261                         int checksumTotal = startCode;
 262                         int multiplier = 0;
 263                         bool lastCharacterWasPrintable = true;
 264
 265                         while (!done) {
 266
 267                                 bool unshift = isNextShifted;
 268                                 isNextShifted = false;
 269
 270                                 // Save off last code
 271                                 lastCode = code;
 272
 273                                 // Decode another code from image
 274                                 code = decodeCode(row, counters, sizeof(counters)/sizeof(int), nextStart);
 275
 276                                 // Remember whether the last code was printable or not (excluding CODE_STOP)
 277                                 if (code != CODE_STOP) {
 278                                         lastCharacterWasPrintable = true;
 279                                 }
 280
 281                                 // Add to checksum computation (if not CODE_STOP of course)
 282                                 if (code != CODE_STOP) {
 283                                         multiplier++;
 284                                         checksumTotal += multiplier * code;
 285                                 }
 286
 287                                 // Advance to where the next code will to start
 288                                 lastStart = nextStart;
 289                                 int _countersLenght = sizeof(counters) / sizeof(int);
 290                                 for (int i = 0; i < _countersLenght; i++) {
 291                                         nextStart += counters[i];
 292                                 }
 293
 294                                 // Take care of illegal start codes
 295                                 switch (code) {
 296                                         case CODE_START_A:
 297                                         case CODE_START_B:
 298                                         case CODE_START_C:
 299                                                 throw ReaderException("");
 300                                 }
 301
 302                                 switch (codeSet) {
 303
 304                                         case CODE_CODE_A:
 305                                                 if (code < 64) {
 306                                                         tmpResultString.append(1, (char) (' ' + code));
 307                                                 } else if (code < 96) {
 308                                                         tmpResultString.append(1, (char) (code - 64));
 309                                                 } else {
 310                                                         // Don't let CODE_STOP, which always appears, affect whether whether we think the last
 311                                                         // code was printable or not.
 312                                                         if (code != CODE_STOP) {
 313                                                                 lastCharacterWasPrintable = false;
 314                                                         }
 315                                                         switch (code) {
 316                                                                 case CODE_FNC_1:
 317                                                                 case CODE_FNC_2:
 318                                                                 case CODE_FNC_3:
 319                                                                 case CODE_FNC_4_A:
 320                                                                         // do nothing?
 321                                                                         break;
 322                                                                 case CODE_SHIFT:
 323                                                                         isNextShifted = true;
 324                                                                         codeSet = CODE_CODE_B;
 325                                                                         break;
 326                                                                 case CODE_CODE_B:
 327                                                                         codeSet = CODE_CODE_B;
 328                                                                         break;
 329                                                                 case CODE_CODE_C:
 330                                                                         codeSet = CODE_CODE_C;
 331                                                                         break;
 332                                                                 case CODE_STOP:
 333                                                                         done = true;
 334                                                                         break;
 335                                                         }
 336                                                 }
 337                                                 break;
 338                                         case CODE_CODE_B:
 339                                                 if (code < 96) {
 340                                                         tmpResultString.append(1, (char) (' ' + code));
 341                                                 } else {
 342                                                         if (code != CODE_STOP) {
 343                                                                 lastCharacterWasPrintable = false;
 344                                                         }
 345                                                         switch (code) {
 346                                                                 case CODE_FNC_1:
 347                                                                 case CODE_FNC_2:
 348                                                                 case CODE_FNC_3:
 349                                                                 case CODE_FNC_4_B:
 350                                                                         // do nothing?
 351                                                                         break;
 352                                                                 case CODE_SHIFT:
 353                                                                         isNextShifted = true;
 354                                                                         codeSet = CODE_CODE_C;
 355                                                                         break;
 356                                                                 case CODE_CODE_A:
 357                                                                         codeSet = CODE_CODE_A;
 358                                                                         break;
 359                                                                 case CODE_CODE_C:
 360                                                                         codeSet = CODE_CODE_C;
 361                                                                         break;
 362                                                                 case CODE_STOP:
 363                                                                         done = true;
 364                                                                         break;
 365                                                         }
 366                                                 }
 367                                                 break;
 368                                         case CODE_CODE_C:
 369                                                 if (code < 100) {
 370                                                         if (code < 10) {
 371                                                                 tmpResultString.append(1, '0');
 372                                                         }
 373                                                         tmpResultString.append(1, code);
 374                                                 } else {
 375                                                         if (code != CODE_STOP) {
 376                                                                 lastCharacterWasPrintable = false;
 377                                                         }
 378                                                         switch (code) {
 379                                                                 case CODE_FNC_1:
 380                                                                         // do nothing?
 381                                                                         break;
 382                                                                 case CODE_CODE_A:
 383                                                                         codeSet = CODE_CODE_A;
 384                                                                         break;
 385                                                                 case CODE_CODE_B:
 386                                                                         codeSet = CODE_CODE_B;
 387                                                                         break;
 388                                                                 case CODE_STOP:
 389                                                                         done = true;
 390                                                                         break;
 391                                                         }
 392                                                 }
 393                                                 break;
 394                                 }
 395
 396                                 // Unshift back to another code set if we were shifted
 397                                 if (unshift) {
 398                                         switch (codeSet) {
 399                                                 case CODE_CODE_A:
 400                                                         codeSet = CODE_CODE_C;
 401                                                         break;
 402                                                 case CODE_CODE_B:
 403                                                         codeSet = CODE_CODE_A;
 404                                                         break;
 405                                                 case CODE_CODE_C:
 406                                                         codeSet = CODE_CODE_B;
 407                                                         break;
 408                                         }
 409                                 }
 410
 411                         }
 412
 413                         // Check for ample whitespace following pattern, but, to do this we first need to remember that
 414                         // we fudged decoding CODE_STOP since it actually has 7 bars, not 6. There is a black bar left
 415                         // to read off. Would be slightly better to properly read. Here we just skip it:
 416                         int width = row->getSize();
 417                         while (nextStart < width && row->get(nextStart)) {
 418                                 nextStart++;
 419                         }
 420                         if (!row->isRange(nextStart, fminl(width, nextStart + (nextStart - lastStart) / 2), false)) {
 421                                 throw ReaderException("");
 422                         }
 423
 424                         // Pull out from sum the value of the penultimate check code
 425                         checksumTotal -= multiplier * lastCode;
 426                         // lastCode is the checksum then:
 427                         if (checksumTotal % 103 != lastCode) {
 428                                 throw ReaderException("");
 429                         }
 430
 431                         // Need to pull out the check digits from string
 432                         int resultLength = tmpResultString.length();
 433                         // Only bother if the result had at least one character, and if the checksum digit happened to
 434                         // be a printable character. If it was just interpreted as a control code, nothing to remove.
 435                         if (resultLength > 0 && lastCharacterWasPrintable) {
 436                                 if (codeSet == CODE_CODE_C) {
 437                                         tmpResultString.erase(resultLength - 2, resultLength);
 438                                 } else {
 439                                         tmpResultString.erase(resultLength - 1, resultLength);
 440                                 }
 441                         }
 442
 443                         Ref<String> resultString(new String(tmpResultString));
 444 //                      String resultString(tmpResultString);
 445
 446                         if (tmpResultString.length() == 0) {
 447                                 // Almost surely a false positive
 448                                 throw ReaderException("");
 449                         }
 450
 451                         float left = (float) (startPatternInfo[1] + startPatternInfo[0]) / 2.0f;
 452                         float right = (float) (nextStart + lastStart) / 2.0f;
 453
 454                         std::vector< Ref<ResultPoint> > resultPoints(2);
 455                         Ref<OneDResultPoint> resultPoint1(new OneDResultPoint(left, (float) rowNumber));
 456                         Ref<OneDResultPoint> resultPoint2(new OneDResultPoint(right, (float) rowNumber));
 457                         resultPoints[0] = resultPoint1;
 458                         resultPoints[1] = resultPoint2;
 459
 460                         ArrayRef<unsigned char> resultBytes(1);
 461
 462                         delete [] startPatternInfo;
 463                         startPatternInfo = NULL;
 464
 465                         Ref<Result> res(new Result(resultString, resultBytes, resultPoints, BarcodeFormat_CODE_128));
 466                         return res;
 467                 }
 468
 469                 void Code128Reader::append(char* s, char c){
 470                         int len = strlen(s);
 471                         s[len] = c;
 472                         s[len + 1] = '\0';
 473                 }
 474
 475                 Code128Reader::~Code128Reader(){
 476                 }
 477         }
 478 }