--- /dev/null
+/*
+ * Code128Reader.cpp
+ * ZXing
+ *
+ * Created by Lukasz Warchol on 10-01-15.
+ * Copyright 2010 ZXing authors All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Code128Reader.h"
+#include <zxing/oned/OneDResultPoint.h>
+#include <zxing/common/Array.h>
+#include <zxing/ReaderException.h>
+#include <math.h>
+
+namespace zxing {
+ namespace oned {
+
+ const int CODE_PATTERNS_LENGHT = 107;
+ const int countersLenght = 6;
+ static const int CODE_PATTERNS[CODE_PATTERNS_LENGHT][countersLenght] = {
+ {2, 1, 2, 2, 2, 2}, /* 0 */
+ {2, 2, 2, 1, 2, 2},
+ {2, 2, 2, 2, 2, 1},
+ {1, 2, 1, 2, 2, 3},
+ {1, 2, 1, 3, 2, 2},
+ {1, 3, 1, 2, 2, 2}, /* 5 */
+ {1, 2, 2, 2, 1, 3},
+ {1, 2, 2, 3, 1, 2},
+ {1, 3, 2, 2, 1, 2},
+ {2, 2, 1, 2, 1, 3},
+ {2, 2, 1, 3, 1, 2}, /* 10 */
+ {2, 3, 1, 2, 1, 2},
+ {1, 1, 2, 2, 3, 2},
+ {1, 2, 2, 1, 3, 2},
+ {1, 2, 2, 2, 3, 1},
+ {1, 1, 3, 2, 2, 2}, /* 15 */
+ {1, 2, 3, 1, 2, 2},
+ {1, 2, 3, 2, 2, 1},
+ {2, 2, 3, 2, 1, 1},
+ {2, 2, 1, 1, 3, 2},
+ {2, 2, 1, 2, 3, 1}, /* 20 */
+ {2, 1, 3, 2, 1, 2},
+ {2, 2, 3, 1, 1, 2},
+ {3, 1, 2, 1, 3, 1},
+ {3, 1, 1, 2, 2, 2},
+ {3, 2, 1, 1, 2, 2}, /* 25 */
+ {3, 2, 1, 2, 2, 1},
+ {3, 1, 2, 2, 1, 2},
+ {3, 2, 2, 1, 1, 2},
+ {3, 2, 2, 2, 1, 1},
+ {2, 1, 2, 1, 2, 3}, /* 30 */
+ {2, 1, 2, 3, 2, 1},
+ {2, 3, 2, 1, 2, 1},
+ {1, 1, 1, 3, 2, 3},
+ {1, 3, 1, 1, 2, 3},
+ {1, 3, 1, 3, 2, 1}, /* 35 */
+ {1, 1, 2, 3, 1, 3},
+ {1, 3, 2, 1, 1, 3},
+ {1, 3, 2, 3, 1, 1},
+ {2, 1, 1, 3, 1, 3},
+ {2, 3, 1, 1, 1, 3}, /* 40 */
+ {2, 3, 1, 3, 1, 1},
+ {1, 1, 2, 1, 3, 3},
+ {1, 1, 2, 3, 3, 1},
+ {1, 3, 2, 1, 3, 1},
+ {1, 1, 3, 1, 2, 3}, /* 45 */
+ {1, 1, 3, 3, 2, 1},
+ {1, 3, 3, 1, 2, 1},
+ {3, 1, 3, 1, 2, 1},
+ {2, 1, 1, 3, 3, 1},
+ {2, 3, 1, 1, 3, 1}, /* 50 */
+ {2, 1, 3, 1, 1, 3},
+ {2, 1, 3, 3, 1, 1},
+ {2, 1, 3, 1, 3, 1},
+ {3, 1, 1, 1, 2, 3},
+ {3, 1, 1, 3, 2, 1}, /* 55 */
+ {3, 3, 1, 1, 2, 1},
+ {3, 1, 2, 1, 1, 3},
+ {3, 1, 2, 3, 1, 1},
+ {3, 3, 2, 1, 1, 1},
+ {3, 1, 4, 1, 1, 1}, /* 60 */
+ {2, 2, 1, 4, 1, 1},
+ {4, 3, 1, 1, 1, 1},
+ {1, 1, 1, 2, 2, 4},
+ {1, 1, 1, 4, 2, 2},
+ {1, 2, 1, 1, 2, 4}, /* 65 */
+ {1, 2, 1, 4, 2, 1},
+ {1, 4, 1, 1, 2, 2},
+ {1, 4, 1, 2, 2, 1},
+ {1, 1, 2, 2, 1, 4},
+ {1, 1, 2, 4, 1, 2}, /* 70 */
+ {1, 2, 2, 1, 1, 4},
+ {1, 2, 2, 4, 1, 1},
+ {1, 4, 2, 1, 1, 2},
+ {1, 4, 2, 2, 1, 1},
+ {2, 4, 1, 2, 1, 1}, /* 75 */
+ {2, 2, 1, 1, 1, 4},
+ {4, 1, 3, 1, 1, 1},
+ {2, 4, 1, 1, 1, 2},
+ {1, 3, 4, 1, 1, 1},
+ {1, 1, 1, 2, 4, 2}, /* 80 */
+ {1, 2, 1, 1, 4, 2},
+ {1, 2, 1, 2, 4, 1},
+ {1, 1, 4, 2, 1, 2},
+ {1, 2, 4, 1, 1, 2},
+ {1, 2, 4, 2, 1, 1}, /* 85 */
+ {4, 1, 1, 2, 1, 2},
+ {4, 2, 1, 1, 1, 2},
+ {4, 2, 1, 2, 1, 1},
+ {2, 1, 2, 1, 4, 1},
+ {2, 1, 4, 1, 2, 1}, /* 90 */
+ {4, 1, 2, 1, 2, 1},
+ {1, 1, 1, 1, 4, 3},
+ {1, 1, 1, 3, 4, 1},
+ {1, 3, 1, 1, 4, 1},
+ {1, 1, 4, 1, 1, 3}, /* 95 */
+ {1, 1, 4, 3, 1, 1},
+ {4, 1, 1, 1, 1, 3},
+ {4, 1, 1, 3, 1, 1},
+ {1, 1, 3, 1, 4, 1},
+ {1, 1, 4, 1, 3, 1}, /* 100 */
+ {3, 1, 1, 1, 4, 1},
+ {4, 1, 1, 1, 3, 1},
+ {2, 1, 1, 4, 1, 2},
+ {2, 1, 1, 2, 1, 4},
+ {2, 1, 1, 2, 3, 2}, /* 105 */
+ {2, 3, 3, 1, 1, 1}
+ };
+
+
+ Code128Reader::Code128Reader(){
+ }
+
+ int* Code128Reader::findStartPattern(Ref<BitArray> row){
+ int width = row->getSize();
+ int rowOffset = 0;
+ while (rowOffset < width) {
+ if (row->get(rowOffset)) {
+ break;
+ }
+ rowOffset++;
+ }
+
+ int counterPosition = 0;
+ int counters[countersLenght] = {0,0,0,0,0,0};
+ int patternStart = rowOffset;
+ bool isWhite = false;
+ int patternLength = sizeof(counters) / sizeof(int);
+
+ for (int i = rowOffset; i < width; i++) {
+ bool pixel = row->get(i);
+ if (pixel ^ isWhite) {
+ counters[counterPosition]++;
+ } else {
+ if (counterPosition == patternLength - 1) {
+ int bestVariance = MAX_AVG_VARIANCE;
+ int bestMatch = -1;
+ for (int startCode = CODE_START_A; startCode <= CODE_START_C; startCode++) {
+ int variance = patternMatchVariance(counters, sizeof(counters)/sizeof(int), CODE_PATTERNS[startCode], MAX_INDIVIDUAL_VARIANCE);
+ if (variance < bestVariance) {
+ bestVariance = variance;
+ bestMatch = startCode;
+ }
+ }
+ if (bestMatch >= 0) {
+ // Look for whitespace before start pattern, >= 50% of width of start pattern
+ if (row->isRange(fmaxl(0, patternStart - (i - patternStart) / 2), patternStart, false)) {
+ int* resultValue = new int[3];
+ resultValue[0] = patternStart;
+ resultValue[1] = i;
+ resultValue[2] = bestMatch;
+ return resultValue;
+ }
+ }
+ patternStart += counters[0] + counters[1];
+ for (int y = 2; y < patternLength; y++) {
+ counters[y - 2] = counters[y];
+ }
+ counters[patternLength - 2] = 0;
+ counters[patternLength - 1] = 0;
+ counterPosition--;
+ } else {
+ counterPosition++;
+ }
+ counters[counterPosition] = 1;
+ isWhite = !isWhite;
+ }
+ }
+ throw ReaderException("");
+ }
+
+ int Code128Reader::decodeCode(Ref<BitArray> row, int counters[], int countersCount, int rowOffset){
+ recordPattern(row, rowOffset, counters, countersCount);
+ int bestVariance = MAX_AVG_VARIANCE; // worst variance we'll accept
+ int bestMatch = -1;
+ for (int d = 0; d < CODE_PATTERNS_LENGHT; d++) {
+ int pattern[countersLenght];
+
+ for(int ind = 0; ind< countersLenght; ind++){
+ pattern[ind] = CODE_PATTERNS[d][ind];
+ }
+// memcpy(pattern, CODE_PATTERNS[d], countersLenght);
+ int variance = patternMatchVariance(counters, countersCount, pattern, MAX_INDIVIDUAL_VARIANCE);
+ if (variance < bestVariance) {
+ bestVariance = variance;
+ bestMatch = d;
+ }
+ }
+ // TODO We're overlooking the fact that the STOP pattern has 7 values, not 6.
+ if (bestMatch >= 0) {
+ return bestMatch;
+ } else {
+ throw ReaderException("");
+ }
+ }
+
+ Ref<Result> Code128Reader::decodeRow(int rowNumber, Ref<BitArray> row){
+
+ int* startPatternInfo = findStartPattern(row);
+ int startCode = startPatternInfo[2];
+ int codeSet;
+ switch (startCode) {
+ case CODE_START_A:
+ codeSet = CODE_CODE_A;
+ break;
+ case CODE_START_B:
+ codeSet = CODE_CODE_B;
+ break;
+ case CODE_START_C:
+ codeSet = CODE_CODE_C;
+ break;
+ default:
+ throw ReaderException("");
+ }
+
+ bool done = false;
+ bool isNextShifted = false;
+
+ std::string tmpResultString;
+
+
+ int lastStart = startPatternInfo[0];
+ int nextStart = startPatternInfo[1];
+ int counters[countersLenght] = {0,0,0,0,0,0};
+
+ int lastCode = 0;
+ int code = 0;
+ int checksumTotal = startCode;
+ int multiplier = 0;
+ bool lastCharacterWasPrintable = true;
+
+ while (!done) {
+
+ bool unshift = isNextShifted;
+ isNextShifted = false;
+
+ // Save off last code
+ lastCode = code;
+
+ // Decode another code from image
+ code = decodeCode(row, counters, sizeof(counters)/sizeof(int), nextStart);
+
+ // Remember whether the last code was printable or not (excluding CODE_STOP)
+ if (code != CODE_STOP) {
+ lastCharacterWasPrintable = true;
+ }
+
+ // Add to checksum computation (if not CODE_STOP of course)
+ if (code != CODE_STOP) {
+ multiplier++;
+ checksumTotal += multiplier * code;
+ }
+
+ // Advance to where the next code will to start
+ lastStart = nextStart;
+ int _countersLenght = sizeof(counters) / sizeof(int);
+ for (int i = 0; i < _countersLenght; i++) {
+ nextStart += counters[i];
+ }
+
+ // Take care of illegal start codes
+ switch (code) {
+ case CODE_START_A:
+ case CODE_START_B:
+ case CODE_START_C:
+ throw ReaderException("");
+ }
+
+ switch (codeSet) {
+
+ case CODE_CODE_A:
+ if (code < 64) {
+ tmpResultString.append(1, (char) (' ' + code));
+ } else if (code < 96) {
+ tmpResultString.append(1, (char) (code - 64));
+ } else {
+ // Don't let CODE_STOP, which always appears, affect whether whether we think the last
+ // code was printable or not.
+ if (code != CODE_STOP) {
+ lastCharacterWasPrintable = false;
+ }
+ switch (code) {
+ case CODE_FNC_1:
+ case CODE_FNC_2:
+ case CODE_FNC_3:
+ case CODE_FNC_4_A:
+ // do nothing?
+ break;
+ case CODE_SHIFT:
+ isNextShifted = true;
+ codeSet = CODE_CODE_B;
+ break;
+ case CODE_CODE_B:
+ codeSet = CODE_CODE_B;
+ break;
+ case CODE_CODE_C:
+ codeSet = CODE_CODE_C;
+ break;
+ case CODE_STOP:
+ done = true;
+ break;
+ }
+ }
+ break;
+ case CODE_CODE_B:
+ if (code < 96) {
+ tmpResultString.append(1, (char) (' ' + code));
+ } else {
+ if (code != CODE_STOP) {
+ lastCharacterWasPrintable = false;
+ }
+ switch (code) {
+ case CODE_FNC_1:
+ case CODE_FNC_2:
+ case CODE_FNC_3:
+ case CODE_FNC_4_B:
+ // do nothing?
+ break;
+ case CODE_SHIFT:
+ isNextShifted = true;
+ codeSet = CODE_CODE_C;
+ break;
+ case CODE_CODE_A:
+ codeSet = CODE_CODE_A;
+ break;
+ case CODE_CODE_C:
+ codeSet = CODE_CODE_C;
+ break;
+ case CODE_STOP:
+ done = true;
+ break;
+ }
+ }
+ break;
+ case CODE_CODE_C:
+ if (code < 100) {
+ if (code < 10) {
+ tmpResultString.append(1, '0');
+ }
+ tmpResultString.append(1, code);
+ } else {
+ if (code != CODE_STOP) {
+ lastCharacterWasPrintable = false;
+ }
+ switch (code) {
+ case CODE_FNC_1:
+ // do nothing?
+ break;
+ case CODE_CODE_A:
+ codeSet = CODE_CODE_A;
+ break;
+ case CODE_CODE_B:
+ codeSet = CODE_CODE_B;
+ break;
+ case CODE_STOP:
+ done = true;
+ break;
+ }
+ }
+ break;
+ }
+
+ // Unshift back to another code set if we were shifted
+ if (unshift) {
+ switch (codeSet) {
+ case CODE_CODE_A:
+ codeSet = CODE_CODE_C;
+ break;
+ case CODE_CODE_B:
+ codeSet = CODE_CODE_A;
+ break;
+ case CODE_CODE_C:
+ codeSet = CODE_CODE_B;
+ break;
+ }
+ }
+
+ }
+
+ // Check for ample whitespace following pattern, but, to do this we first need to remember that
+ // we fudged decoding CODE_STOP since it actually has 7 bars, not 6. There is a black bar left
+ // to read off. Would be slightly better to properly read. Here we just skip it:
+ int width = row->getSize();
+ while (nextStart < width && row->get(nextStart)) {
+ nextStart++;
+ }
+ if (!row->isRange(nextStart, fminl(width, nextStart + (nextStart - lastStart) / 2), false)) {
+ throw ReaderException("");
+ }
+
+ // Pull out from sum the value of the penultimate check code
+ checksumTotal -= multiplier * lastCode;
+ // lastCode is the checksum then:
+ if (checksumTotal % 103 != lastCode) {
+ throw ReaderException("");
+ }
+
+ // Need to pull out the check digits from string
+ int resultLength = tmpResultString.length();
+ // Only bother if the result had at least one character, and if the checksum digit happened to
+ // be a printable character. If it was just interpreted as a control code, nothing to remove.
+ if (resultLength > 0 && lastCharacterWasPrintable) {
+ if (codeSet == CODE_CODE_C) {
+ tmpResultString.erase(resultLength - 2, resultLength);
+ } else {
+ tmpResultString.erase(resultLength - 1, resultLength);
+ }
+ }
+
+ Ref<String> resultString(new String(tmpResultString));
+// String resultString(tmpResultString);
+
+ if (tmpResultString.length() == 0) {
+ // Almost surely a false positive
+ throw ReaderException("");
+ }
+
+ float left = (float) (startPatternInfo[1] + startPatternInfo[0]) / 2.0f;
+ float right = (float) (nextStart + lastStart) / 2.0f;
+
+ std::vector< Ref<ResultPoint> > resultPoints(2);
+ Ref<OneDResultPoint> resultPoint1(new OneDResultPoint(left, (float) rowNumber));
+ Ref<OneDResultPoint> resultPoint2(new OneDResultPoint(right, (float) rowNumber));
+ resultPoints[0] = resultPoint1;
+ resultPoints[1] = resultPoint2;
+
+ ArrayRef<unsigned char> resultBytes(1);
+
+ delete [] startPatternInfo;
+ startPatternInfo = NULL;
+
+ Ref<Result> res(new Result(resultString, resultBytes, resultPoints, BarcodeFormat_CODE_128));
+ return res;
+ }
+
+ void Code128Reader::append(char* s, char c){
+ int len = strlen(s);
+ s[len] = c;
+ s[len + 1] = '\0';
+ }
+
+ Code128Reader::~Code128Reader(){
+ }
+ }
+}
projects / zxing.git / blobdiff