/*
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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 "ZXBoolArray.h"
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#import "ZXEAN13Reader.h"
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#import "ZXEAN13Writer.h"
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#import "ZXUPCEANReader.h"
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const int ZX_EAN13_CODE_WIDTH = 3 + // start guard
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(7 * 6) + // left bars
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5 + // middle guard
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(7 * 6) + // right bars
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3; // end guard
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@implementation ZXEAN13Writer
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- (ZXBitMatrix *)encode:(NSString *)contents format:(ZXBarcodeFormat)format width:(int)width height:(int)height hints:(ZXEncodeHints *)hints error:(NSError **)error {
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if (format != kBarcodeFormatEan13) {
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@throw [NSException exceptionWithName:NSInvalidArgumentException
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reason:[NSString stringWithFormat:@"Can only encode EAN_13, but got %d", format]
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userInfo:nil];
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}
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return [super encode:contents format:format width:width height:height hints:hints error:error];
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}
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- (ZXBoolArray *)encode:(NSString *)contents {
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if ([contents length] != 13) {
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[NSException raise:NSInvalidArgumentException
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format:@"Requested contents should be 13 digits long, but got %d", (int)[contents length]];
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}
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if (![ZXUPCEANReader checkStandardUPCEANChecksum:contents]) {
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[NSException raise:NSInvalidArgumentException
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format:@"Contents do not pass checksum"];
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}
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int firstDigit = [[contents substringToIndex:1] intValue];
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int parities = ZX_EAN13_FIRST_DIGIT_ENCODINGS[firstDigit];
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ZXBoolArray *result = [[ZXBoolArray alloc] initWithLength:ZX_EAN13_CODE_WIDTH];
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int pos = 0;
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pos += [self appendPattern:result pos:pos pattern:ZX_UPC_EAN_START_END_PATTERN patternLen:ZX_UPC_EAN_START_END_PATTERN_LEN startColor:YES];
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for (int i = 1; i <= 6; i++) {
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int digit = [[contents substringWithRange:NSMakeRange(i, 1)] intValue];
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if ((parities >> (6 - i) & 1) == 1) {
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digit += 10;
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}
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pos += [self appendPattern:result pos:pos pattern:ZX_UPC_EAN_L_AND_G_PATTERNS[digit] patternLen:ZX_UPC_EAN_L_PATTERNS_SUB_LEN startColor:FALSE];
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}
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pos += [self appendPattern:result pos:pos pattern:ZX_UPC_EAN_MIDDLE_PATTERN patternLen:ZX_UPC_EAN_MIDDLE_PATTERN_LEN startColor:FALSE];
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for (int i = 7; i <= 12; i++) {
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int digit = [[contents substringWithRange:NSMakeRange(i, 1)] intValue];
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pos += [self appendPattern:result pos:pos pattern:ZX_UPC_EAN_L_PATTERNS[digit] patternLen:ZX_UPC_EAN_L_PATTERNS_SUB_LEN startColor:YES];
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}
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[self appendPattern:result pos:pos pattern:ZX_UPC_EAN_START_END_PATTERN patternLen:ZX_UPC_EAN_START_END_PATTERN_LEN startColor:YES];
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return result;
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}
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@end
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