/*
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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 "ZXAI01decoder.h"
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#import "ZXBitArray.h"
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#import "ZXRSSExpandedGeneralAppIdDecoder.h"
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const int ZX_AI01_GTIN_SIZE = 40;
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@implementation ZXAI01decoder
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- (void)encodeCompressedGtin:(NSMutableString *)buf currentPos:(int)currentPos {
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[buf appendString:@"(01)"];
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int initialPosition = (int)[buf length];
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[buf appendString:@"9"];
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[self encodeCompressedGtinWithoutAI:buf currentPos:currentPos initialBufferPosition:initialPosition];
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}
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- (void)encodeCompressedGtinWithoutAI:(NSMutableString *)buf currentPos:(int)currentPos initialBufferPosition:(int)initialBufferPosition {
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for (int i = 0; i < 4; ++i) {
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int currentBlock = [self.generalDecoder extractNumericValueFromBitArray:currentPos + 10 * i bits:10];
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if (currentBlock / 100 == 0) {
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[buf appendString:@"0"];
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}
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if (currentBlock / 10 == 0) {
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[buf appendString:@"0"];
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}
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[buf appendFormat:@"%d", currentBlock];
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}
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[self appendCheckDigit:buf currentPos:initialBufferPosition];
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}
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- (void)appendCheckDigit:(NSMutableString *)buf currentPos:(int)currentPos {
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int checkDigit = 0;
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for (int i = 0; i < 13; i++) {
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int digit = [buf characterAtIndex:i + currentPos] - '0';
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checkDigit += (i & 0x01) == 0 ? 3 * digit : digit;
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}
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checkDigit = 10 - (checkDigit % 10);
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if (checkDigit == 10) {
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checkDigit = 0;
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}
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[buf appendFormat:@"%d", checkDigit];
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}
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@end
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