/*
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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 "ZXBoolArray.h"
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#import "ZXITFReader.h"
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#import "ZXITFWriter.h"
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const int ZX_ITF_WRITER_START_PATTERN[] = {1, 1, 1, 1};
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const int ZX_ITF_WRITER_END_PATTERN[] = {3, 1, 1};
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@implementation ZXITFWriter
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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 != kBarcodeFormatITF) {
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[NSException raise:NSInvalidArgumentException format:@"Can only encode ITF"];
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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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int length = (int)[contents length];
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if (length % 2 != 0) {
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[NSException raise:NSInvalidArgumentException format:@"The length of the input should be even"];
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}
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if (length > 80) {
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[NSException raise:NSInvalidArgumentException format:@"Requested contents should be less than 80 digits long, but got %d", length];
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}
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ZXBoolArray *result = [[ZXBoolArray alloc] initWithLength:9 + 9 * length];
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int pos = [self appendPattern:result pos:0 pattern:ZX_ITF_WRITER_START_PATTERN patternLen:sizeof(ZX_ITF_WRITER_START_PATTERN)/sizeof(int) startColor:YES];
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for (int i = 0; i < length; i += 2) {
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int one = [[contents substringWithRange:NSMakeRange(i, 1)] intValue];
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int two = [[contents substringWithRange:NSMakeRange(i + 1, 1)] intValue];
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const int encodingLen = 18;
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int encoding[encodingLen];
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memset(encoding, 0, encodingLen * sizeof(int));
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for (int j = 0; j < 5; j++) {
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encoding[2 * j] = ZX_ITF_PATTERNS[one][j];
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encoding[2 * j + 1] = ZX_ITF_PATTERNS[two][j];
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}
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pos += [super appendPattern:result pos:pos pattern:encoding patternLen:encodingLen startColor:YES];
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}
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[self appendPattern:result pos:pos pattern:ZX_ITF_WRITER_END_PATTERN patternLen:sizeof(ZX_ITF_WRITER_END_PATTERN)/sizeof(int) startColor:YES];
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return result;
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}
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@end
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