/*
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* Copyright 2012 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "ZXBitArray.h"
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#import "ZXEAN8Reader.h"
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#import "ZXIntArray.h"
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@interface ZXEAN8Reader ()
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@property (nonatomic, strong, readonly) ZXIntArray *decodeMiddleCounters;
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@end
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@implementation ZXEAN8Reader
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- (id)init {
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if (self = [super init]) {
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_decodeMiddleCounters = [[ZXIntArray alloc] initWithLength:4];
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}
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return self;
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}
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- (int)decodeMiddle:(ZXBitArray *)row startRange:(NSRange)startRange result:(NSMutableString *)result error:(NSError **)error {
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ZXIntArray *counters = self.decodeMiddleCounters;
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[counters clear];
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int end = row.size;
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int rowOffset = (int)NSMaxRange(startRange);
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for (int x = 0; x < 4 && rowOffset < end; x++) {
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int bestMatch = [ZXUPCEANReader decodeDigit:row counters:counters rowOffset:rowOffset patternType:ZX_UPC_EAN_PATTERNS_L_PATTERNS error:error];
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if (bestMatch == -1) {
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return -1;
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}
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[result appendFormat:@"%C", (unichar)('0' + bestMatch)];
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rowOffset += [counters sum];
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}
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NSRange middleRange = [[self class] findGuardPattern:row rowOffset:rowOffset whiteFirst:YES pattern:ZX_UPC_EAN_MIDDLE_PATTERN patternLen:ZX_UPC_EAN_MIDDLE_PATTERN_LEN error:error];
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if (middleRange.location == NSNotFound) {
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return -1;
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}
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rowOffset = (int)NSMaxRange(middleRange);
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for (int x = 0; x < 4 && rowOffset < end; x++) {
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int bestMatch = [ZXUPCEANReader decodeDigit:row counters:counters rowOffset:rowOffset patternType:ZX_UPC_EAN_PATTERNS_L_PATTERNS error:error];
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if (bestMatch == -1) {
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return -1;
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}
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[result appendFormat:@"%C", (unichar)('0' + bestMatch)];
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rowOffset += [counters sum];
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}
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return rowOffset;
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}
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- (ZXBarcodeFormat)barcodeFormat {
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return kBarcodeFormatEan8;
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}
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@end
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