qzxing/source/zxing/oned/UPCEANReader.h

// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
#ifndef __UPC_EAN_READER_H__
#define __UPC_EAN_READER_H__

/*
 *  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 <zxing/oned/OneDReader.h>
#include <zxing/common/BitArray.h>
#include <zxing/Result.h>

typedef enum UPC_EAN_PATTERNS {
	UPC_EAN_PATTERNS_L_PATTERNS = 0,
	UPC_EAN_PATTERNS_L_AND_G_PATTERNS
} UPC_EAN_PATTERNS;

namespace zxing {
	namespace oned {
		class UPCEANReader : public OneDReader {

		private:
      enum {MAX_AVG_VARIANCE = (unsigned int) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 420/1000)};
      enum {MAX_INDIVIDUAL_VARIANCE = (int) (PATTERN_MATCH_RESULT_SCALE_FACTOR * 700/1000)};

			static bool findStartGuardPattern(Ref<BitArray> row, int* rangeStart, int* rangeEnd);

			virtual bool decodeEnd(Ref<BitArray> row, int endStart, int* endGuardBegin, int* endGuardEnd);

			static bool checkStandardUPCEANChecksum(std::string s);
		protected:
			static bool findGuardPattern(Ref<BitArray> row, int rowOffset, bool whiteFirst,
			    const int pattern[], int patternLen, int* start, int* end);

			virtual int getMIDDLE_PATTERN_LEN();
			virtual const int* getMIDDLE_PATTERN();

		public:
			UPCEANReader();

      // Returns < 0 on failure, >= 0 on success.
			virtual int decodeMiddle(Ref<BitArray> row, int startGuardBegin, int startGuardEnd,
			    std::string& resultString) = 0;

			Ref<Result> decodeRow(int rowNumber, Ref<BitArray> row);

			// TODO(dswitkin): Should this be virtual so that UPCAReader can override it?
			Ref<Result> decodeRow(int rowNumber, Ref<BitArray> row, int startGuardBegin,
          int startGuardEnd);

      // Returns < 0 on failure, >= 0 on success.
			static int decodeDigit(Ref<BitArray> row, int counters[], int countersLen, int rowOffset,
			    UPC_EAN_PATTERNS patternType);

			virtual bool checkChecksum(std::string s);

			virtual BarcodeFormat getBarcodeFormat() = 0;
			virtual ~UPCEANReader();
		};
	}
}

#endif