added missing methods

src/zxing/zxing/common/Str.cpp

@@ -43,8 +43,8 @@ int String::size() const { return int(text_.size()); }
 
 int String::length() const { return int(text_.size()); }
 
-Ref<String> String::substring(int i) const {
+Ref<String> String::substring(int i, int j) const {
-  return Ref<String>(new String(text_.substr(i)));
+  return Ref<String>(new String(text_.substr(i, j)));
 }
 
 void String::append(const std::string &tail) {

src/zxing/zxing/common/Str.h

@@ -37,7 +37,7 @@ public:
   explicit String(const std::string &text);
   explicit String(int);
   char charAt(int) const;
-  Ref<String> substring(int) const;
+  Ref<String> substring(int, int = -1) const;
   const std::string& getText() const;
   int size() const;
   void append(std::string const& tail);

src/zxing/zxing/common/detector/MathUtils.h

@@ -18,6 +18,7 @@
  */
 
 #include <cmath>
+#include <vector>
 
 namespace zxing {
 namespace common {
@@ -48,6 +49,14 @@ class MathUtils {
     int yDiff = aY - bY;
     return sqrt(float(xDiff * xDiff + yDiff * yDiff));
   }
+
+  static inline int sum(std::vector<int> array) {
+    int count = 0;
+    for (int a : array) {
+      count += a;
+    }
+    return count;
+  }
 };
 
 }

src/zxing/zxing/oned/OneDReader.cpp

@@ -221,4 +221,24 @@ void OneDReader::recordPattern(Ref<BitArray> row,
   }
 }
 
+void OneDReader::recordPatternInReverse(Ref<BitArray> row,
+                                        int start,
+                                        vector<int>& counters)
+{
+    // This could be more efficient I guess
+    int numTransitionsLeft = int(counters.size());
+    bool last = row->get(start);
+    while (start > 0 && numTransitionsLeft >= 0) {
+        if (row->get(--start) != last) {
+            numTransitionsLeft--;
+            last = !last;
+        }
+    }
+    if (numTransitionsLeft >= 0)
+    {
+        throw NotFoundException();
+    }
+    recordPattern(row, start + 1, counters);
+}
+
 OneDReader::~OneDReader() {}

src/zxing/zxing/oned/OneDReader.h

@@ -72,6 +72,10 @@ public:
   static void recordPattern(Ref<BitArray> row,
                             int start,
                             std::vector<int>& counters);
+
+  static void recordPatternInReverse(Ref<BitArray> row,
+                                     int start,
+                                     std::vector<int>& counters);
   virtual ~OneDReader();
 };