/*
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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 "ZXDecodeHints.h"
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#import "ZXEAN8Reader.h"
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#import "ZXEAN13Reader.h"
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#import "ZXErrors.h"
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#import "ZXMultiFormatUPCEANReader.h"
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#import "ZXReader.h"
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#import "ZXResult.h"
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#import "ZXUPCAReader.h"
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#import "ZXUPCEReader.h"
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@interface ZXMultiFormatUPCEANReader ()
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@property (nonatomic, strong, readonly) NSMutableArray *readers;
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@end
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@implementation ZXMultiFormatUPCEANReader
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- (id)initWithHints:(ZXDecodeHints *)hints {
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if (self = [super init]) {
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_readers = [NSMutableArray array];
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if (hints != nil) {
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if ([hints containsFormat:kBarcodeFormatEan13]) {
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[_readers addObject:[[ZXEAN13Reader alloc] init]];
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} else if ([hints containsFormat:kBarcodeFormatUPCA]) {
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[_readers addObject:[[ZXUPCAReader alloc] init]];
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}
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if ([hints containsFormat:kBarcodeFormatEan8]) {
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[_readers addObject:[[ZXEAN8Reader alloc] init]];
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}
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if ([hints containsFormat:kBarcodeFormatUPCE]) {
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[_readers addObject:[[ZXUPCEReader alloc] init]];
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}
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}
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if ([_readers count] == 0) {
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[_readers addObject:[[ZXEAN13Reader alloc] init]];
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[_readers addObject:[[ZXEAN8Reader alloc] init]];
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[_readers addObject:[[ZXUPCEReader alloc] init]];
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}
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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 hints:(ZXDecodeHints *)hints error:(NSError **)error {
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NSRange startGuardPattern = [ZXUPCEANReader findStartGuardPattern:row error:error];
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if (startGuardPattern.location == NSNotFound) {
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return nil;
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}
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for (ZXUPCEANReader *reader in self.readers) {
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ZXResult *result = [reader decodeRow:rowNumber row:row startGuardRange:startGuardPattern hints:hints error:error];
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if (!result) {
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continue;
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}
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// Special case: a 12-digit code encoded in UPC-A is identical to a "0"
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// followed by those 12 digits encoded as EAN-13. Each will recognize such a code,
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// UPC-A as a 12-digit string and EAN-13 as a 13-digit string starting with "0".
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// Individually these are correct and their readers will both read such a code
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// and correctly call it EAN-13, or UPC-A, respectively.
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//
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// In this case, if we've been looking for both types, we'd like to call it
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// a UPC-A code. But for efficiency we only run the EAN-13 decoder to also read
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// UPC-A. So we special case it here, and convert an EAN-13 result to a UPC-A
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// result if appropriate.
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//
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// But, don't return UPC-A if UPC-A was not a requested format!
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BOOL ean13MayBeUPCA = kBarcodeFormatEan13 == result.barcodeFormat && [result.text characterAtIndex:0] == '0';
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BOOL canReturnUPCA = hints == nil || [hints numberOfPossibleFormats] == 0 || [hints containsFormat:kBarcodeFormatUPCA];
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if (ean13MayBeUPCA && canReturnUPCA) {
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// Transfer the metdata across
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ZXResult *resultUPCA = [ZXResult resultWithText:[result.text substringFromIndex:1]
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rawBytes:result.rawBytes
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resultPoints:result.resultPoints
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format:kBarcodeFormatUPCA];
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[resultUPCA putAllMetadata:result.resultMetadata];
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return resultUPCA;
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}
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return result;
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}
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if (error) *error = ZXNotFoundErrorInstance();
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return nil;
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}
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- (void)reset {
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for (id<ZXReader> reader in self.readers) {
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[reader reset];
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}
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}
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@end
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