* UPCEANReader.cpp
* ZXing
*
- * Created by Lukasz Warchol on 10-01-21.
* Copyright 2010 ZXing authors All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
#include "UPCEANReader.h"
#include <zxing/oned/OneDResultPoint.h>
#include <zxing/ReaderException.h>
+
namespace zxing {
namespace oned {
-
+
/**
* Start/end guard pattern.
*/
static const int START_END_PATTERN[3] = {1, 1, 1};
-
+
/**
* Pattern marking the middle of a UPC/EAN pattern, separating the two halves.
*/
static const int MIDDLE_PATTERN_LEN = 5;
static const int MIDDLE_PATTERN[MIDDLE_PATTERN_LEN] = {1, 1, 1, 1, 1};
-
+
/**
* "Odd", or "L" patterns used to encode UPC/EAN digits.
*/
{1, 2, 1, 3}, // 8
{3, 1, 1, 2} // 9
};
-
+
/**
* As above but also including the "even", or "G" patterns used to encode UPC/EAN digits.
*/
{3, 1, 2, 1}, // 18 reversed 8
{2, 1, 1, 3} // 19 reversed 9
};
-
- const int UPCEANReader::getMIDDLE_PATTERN_LEN(){
+
+ const int UPCEANReader::getMIDDLE_PATTERN_LEN() {
return MIDDLE_PATTERN_LEN;
}
- const int* UPCEANReader::getMIDDLE_PATTERN(){
+
+ const int* UPCEANReader::getMIDDLE_PATTERN() {
return MIDDLE_PATTERN;
}
-
- UPCEANReader::UPCEANReader(){
+
+ UPCEANReader::UPCEANReader() {
}
-
-
+
+
Ref<Result> UPCEANReader::decodeRow(int rowNumber, Ref<BitArray> row) {
- int* start = NULL;
- try {
- start = findStartGuardPattern(row);
- Ref<Result> result = decodeRow(rowNumber, row, start);
- delete [] start;
- return result;
- } catch (ReaderException const& re) {
- delete [] start;
- throw re;
+ int* start = findStartGuardPattern(row);
+ if (start != NULL) {
+ try {
+ Ref<Result> result = decodeRow(rowNumber, row, start);
+ delete [] start;
+ return result;
+ } catch (ReaderException const& re) {
+ delete [] start;
+ }
}
+ return Ref<Result>();
}
-
- Ref<Result> UPCEANReader::decodeRow(int rowNumber, Ref<BitArray> row, int startGuardRange[]){
- int* endRange = NULL;
- try {
- std::string tmpResultString;
- std::string& tmpResultStringRef = tmpResultString;
- int endStart;
- endStart = decodeMiddle(row, startGuardRange, 2 /*reference findGuardPattern*/ , tmpResultStringRef);
-
- endRange = decodeEnd(row, endStart);
-
- // Make sure there is a quiet zone at least as big as the end pattern after the barcode. The
- // spec might want more whitespace, but in practice this is the maximum we can count on.
- size_t end = endRange[1];
- size_t quietEnd = end + (end - endRange[0]);
- if (quietEnd >= row->getSize() || !row->isRange(end, quietEnd, false)) {
- throw ReaderException("Quiet zone asserrt fail.");
- }
- if (!checkChecksum(tmpResultString)) {
- throw ReaderException("Checksum fail.");
- }
-
- Ref<String> resultString(new String(tmpResultString));
-
- float left = (float) (startGuardRange[1] + startGuardRange[0]) / 2.0f;
- float right = (float) (endRange[1] + endRange[0]) / 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);
-
- Ref<Result> res(new Result(resultString, resultBytes, resultPoints, getBarcodeFormat()));
+ Ref<Result> UPCEANReader::decodeRow(int rowNumber, Ref<BitArray> row, int startGuardRange[]) {
+ std::string tmpResultString;
+ std::string& tmpResultStringRef = tmpResultString;
+ int endStart = decodeMiddle(row, startGuardRange, 2 /*reference findGuardPattern*/ ,
+ tmpResultStringRef);
+ if (endStart < 0) {
+ return Ref<Result>();
+ }
+ int* endRange = decodeEnd(row, endStart);
+ if (endRange == NULL) {
+ return Ref<Result>();
+ }
+
+ // Make sure there is a quiet zone at least as big as the end pattern after the barcode.
+ // The spec might want more whitespace, but in practice this is the maximum we can count on.
+ size_t end = endRange[1];
+ size_t quietEnd = end + (end - endRange[0]);
+ if (quietEnd >= row->getSize() || !row->isRange(end, quietEnd, false)) {
delete [] endRange;
- return res;
- } catch (ReaderException const& re) {
+ return Ref<Result>();
+ }
+
+ if (!checkChecksum(tmpResultString)) {
delete [] endRange;
- throw re;
- }
+ return Ref<Result>();
+ }
+
+ Ref<String> resultString(new String(tmpResultString));
+ float left = (float) (startGuardRange[1] + startGuardRange[0]) / 2.0f;
+ float right = (float) (endRange[1] + endRange[0]) / 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);
+ Ref<Result> res(new Result(resultString, resultBytes, resultPoints, getBarcodeFormat()));
+ delete [] endRange;
+ return res;
}
-
- int* UPCEANReader::findStartGuardPattern(Ref<BitArray> row){
+
+ int* UPCEANReader::findStartGuardPattern(Ref<BitArray> row) {
bool foundStart = false;
-
int* startRange = NULL;
int nextStart = 0;
- try {
- while (!foundStart) {
- delete [] startRange;
- startRange = NULL;
- startRange = findGuardPattern(row, nextStart, false, START_END_PATTERN, sizeof(START_END_PATTERN)/sizeof(int));
- int start = startRange[0];
- nextStart = startRange[1];
- // Make sure there is a quiet zone at least as big as the start pattern before the barcode.
- // If this check would run off the left edge of the image, do not accept this barcode,
- // as it is very likely to be a false positive.
- int quietStart = start - (nextStart - start);
- if (quietStart >= 0) {
- foundStart = row->isRange(quietStart, start, false);
- }
- }
- return startRange;
- } catch (ReaderException const& re) {
+ while (!foundStart) {
delete [] startRange;
- throw re;
+ startRange = findGuardPattern(row, nextStart, false, START_END_PATTERN,
+ sizeof(START_END_PATTERN) / sizeof(int));
+ if (startRange == NULL) {
+ return NULL;
+ }
+ int start = startRange[0];
+ nextStart = startRange[1];
+ // Make sure there is a quiet zone at least as big as the start pattern before the barcode.
+ // If this check would run off the left edge of the image, do not accept this barcode,
+ // as it is very likely to be a false positive.
+ int quietStart = start - (nextStart - start);
+ if (quietStart >= 0) {
+ foundStart = row->isRange(quietStart, start, false);
+ }
}
+ return startRange;
}
-
+
// TODO(flyashi): Return a pair<int, int> for return value to avoid using the heap.
- int* UPCEANReader::findGuardPattern(Ref<BitArray> row, int rowOffset, bool whiteFirst, const int pattern[], int patternLen){
+ int* UPCEANReader::findGuardPattern(Ref<BitArray> row, int rowOffset, bool whiteFirst,
+ const int pattern[], int patternLen) {
int patternLength = patternLen;
int counters[patternLength];
int countersCount = sizeof(counters) / sizeof(int);
}
rowOffset++;
}
-
+
int counterPosition = 0;
int patternStart = rowOffset;
for (int x = rowOffset; x < width; x++) {
counters[counterPosition]++;
} else {
if (counterPosition == patternLength - 1) {
- if (patternMatchVariance(counters, countersCount, pattern, MAX_INDIVIDUAL_VARIANCE) < MAX_AVG_VARIANCE) {
+ if (patternMatchVariance(counters, countersCount, pattern,
+ MAX_INDIVIDUAL_VARIANCE) < MAX_AVG_VARIANCE) {
int* resultValue = new int[2];
resultValue[0] = patternStart;
resultValue[1] = x;
isWhite = !isWhite;
}
}
- throw ReaderException("findGuardPattern");
+ return NULL;
}
-
- int* UPCEANReader::decodeEnd(Ref<BitArray> row, int endStart){
- return findGuardPattern(row, endStart, false, START_END_PATTERN, sizeof(START_END_PATTERN)/sizeof(int));
+
+ int* UPCEANReader::decodeEnd(Ref<BitArray> row, int endStart) {
+ return findGuardPattern(row, endStart, false, START_END_PATTERN,
+ sizeof(START_END_PATTERN) / sizeof(int));
}
-
-// int UPCEANReader::decodeDigit(Ref<BitArray> row, int counters[], int countersLen, int rowOffset, int** patterns/*[][]*/, int paterns1Len, int paterns2Len)
- int UPCEANReader::decodeDigit(Ref<BitArray> row, int counters[], int countersLen, int rowOffset, UPC_EAN_PATTERNS patternType){
- recordPattern(row, rowOffset, counters, countersLen);
+
+ int UPCEANReader::decodeDigit(Ref<BitArray> row, int counters[], int countersLen, int rowOffset,
+ UPC_EAN_PATTERNS patternType) {
+ if (!recordPattern(row, rowOffset, counters, countersLen)) {
+ return -1;
+ }
unsigned int bestVariance = MAX_AVG_VARIANCE; // worst variance we'll accept
int bestMatch = -1;
-
+
int max = 0;
switch (patternType) {
case UPC_EAN_PATTERNS_L_PATTERNS:
for(int j = 0; j< countersLen; j++){
pattern[j] = L_PATTERNS[i][j];
}
-
- unsigned int variance = patternMatchVariance(counters, countersLen, pattern, MAX_INDIVIDUAL_VARIANCE);
+
+ unsigned int variance = patternMatchVariance(counters, countersLen, pattern,
+ MAX_INDIVIDUAL_VARIANCE);
if (variance < bestVariance) {
bestVariance = variance;
bestMatch = i;
for(int j = 0; j< countersLen; j++){
pattern[j] = L_AND_G_PATTERNS[i][j];
}
-
- unsigned int variance = patternMatchVariance(counters, countersLen, pattern, MAX_INDIVIDUAL_VARIANCE);
+
+ unsigned int variance = patternMatchVariance(counters, countersLen, pattern,
+ MAX_INDIVIDUAL_VARIANCE);
if (variance < bestVariance) {
bestVariance = variance;
bestMatch = i;
default:
break;
}
- if (bestMatch >= 0) {
- return bestMatch;
- } else {
- throw ReaderException("UPCEANReader::decodeDigit: No best mach");
- }
+ return bestMatch;
}
-
-
+
/**
* @return {@link #checkStandardUPCEANChecksum(String)}
*/
- bool UPCEANReader::checkChecksum(std::string s){
+ bool UPCEANReader::checkChecksum(std::string s) {
return checkStandardUPCEANChecksum(s);
}
-
+
/**
* Computes the UPC/EAN checksum on a string of digits, and reports
* whether the checksum is correct or not.
*
* @param s string of digits to check
* @return true iff string of digits passes the UPC/EAN checksum algorithm
- * @throws ReaderException if the string does not contain only digits
*/
- bool UPCEANReader::checkStandardUPCEANChecksum(std::string s){
+ bool UPCEANReader::checkStandardUPCEANChecksum(std::string s) {
int length = s.length();
if (length == 0) {
return false;
}
-
+
int sum = 0;
for (int i = length - 2; i >= 0; i -= 2) {
int digit = (int) s[i] - (int) '0';
if (digit < 0 || digit > 9) {
- throw ReaderException("checkStandardUPCEANChecksum");
+ return false;
}
sum += digit;
}
for (int i = length - 1; i >= 0; i -= 2) {
int digit = (int) s[i] - (int) '0';
if (digit < 0 || digit > 9) {
- throw ReaderException("checkStandardUPCEANChecksum");
+ return false;
}
sum += digit;
}
return sum % 10 == 0;
}
- UPCEANReader::~UPCEANReader(){
+
+ UPCEANReader::~UPCEANReader() {
}
}
}
projects / zxing.git / blobdiff