/*
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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 "ZXBarcodeFormat.h"
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#import "ZXBitArray.h"
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#import "ZXErrors.h"
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#import "ZXIntArray.h"
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#import "ZXResult.h"
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#import "ZXResultMetadataType.h"
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#import "ZXResultPoint.h"
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#import "ZXUPCEANExtension2Support.h"
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#import "ZXUPCEANReader.h"
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@interface ZXUPCEANExtension2Support ()
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@property (nonatomic, strong, readonly) ZXIntArray *decodeMiddleCounters;
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@end
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@implementation ZXUPCEANExtension2Support
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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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- (ZXResult *)decodeRow:(int)rowNumber row:(ZXBitArray *)row extensionStartRange:(NSRange)extensionStartRange error:(NSError **)error {
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NSMutableString *resultString = [NSMutableString string];
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int end = [self decodeMiddle:row startRange:extensionStartRange result:resultString error:error];
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if (end == -1) {
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return nil;
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}
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NSMutableDictionary *extensionData = [self parseExtensionString:resultString];
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ZXResult *extensionResult = [[ZXResult alloc] initWithText:resultString
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rawBytes:nil
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resultPoints:@[[[ZXResultPoint alloc] initWithX:(extensionStartRange.location + NSMaxRange(extensionStartRange)) / 2.0f y:rowNumber],
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[[ZXResultPoint alloc] initWithX:end y:rowNumber]]
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format:kBarcodeFormatUPCEANExtension];
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if (extensionData != nil) {
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[extensionResult putAllMetadata:extensionData];
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}
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return extensionResult;
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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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int checkParity = 0;
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for (int x = 0; x < 2 && rowOffset < end; x++) {
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int bestMatch = [ZXUPCEANReader decodeDigit:row counters:counters rowOffset:rowOffset patternType:ZX_UPC_EAN_PATTERNS_L_AND_G_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 % 10)];
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rowOffset += [counters sum];
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if (bestMatch >= 10) {
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checkParity |= 1 << (1 - x);
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}
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if (x != 1) {
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// Read off separator if not last
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rowOffset = [row nextSet:rowOffset];
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rowOffset = [row nextUnset:rowOffset];
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}
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}
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if (result.length != 2) {
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if (error) *error = ZXNotFoundErrorInstance();
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return -1;
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}
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if ([result intValue] % 4 != checkParity) {
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if (error) *error = ZXNotFoundErrorInstance();
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return -1;
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}
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return rowOffset;
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}
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/**
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* @param raw raw content of extension
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* @return formatted interpretation of raw content as a NSDictionary mapping
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* one ZXResultMetadataType to appropriate value, or nil if not known
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*/
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- (NSMutableDictionary *)parseExtensionString:(NSString *)raw {
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if (raw.length != 2) {
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return nil;
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}
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return [NSMutableDictionary dictionaryWithObject:@([raw intValue])
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forKey:@(kResultMetadataTypeIssueNumber)];
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}
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@end
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