/*
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* Copyright 2014 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 "ZXAztecBinaryShiftToken.h"
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#import "ZXBitArray.h"
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#import "ZXByteArray.h"
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@interface ZXAztecBinaryShiftToken ()
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@property (nonatomic, assign, readonly) int16_t binaryShiftStart;
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@property (nonatomic, assign, readonly) int16_t binaryShiftByteCount;
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@end
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@implementation ZXAztecBinaryShiftToken
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- (id)initWithPrevious:(ZXAztecToken *)previous binaryShiftStart:(int)binaryShiftStart binaryShiftByteCount:(int)binaryShiftByteCount {
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if (self = [super initWithPrevious:previous]) {
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_binaryShiftStart = (int16_t) binaryShiftStart;
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_binaryShiftByteCount = (int16_t) binaryShiftByteCount;
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}
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return self;
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}
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- (void)appendTo:(ZXBitArray *)bitArray text:(ZXByteArray *)text {
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for (int i = 0; i < self.binaryShiftByteCount; i++) {
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if (i == 0 || (i == 31 && self.binaryShiftByteCount <= 62)) {
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// We need a header before the first character, and before
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// character 31 when the total byte code is <= 62
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[bitArray appendBits:31 numBits:5]; // BINARY_SHIFT
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if (self.binaryShiftByteCount > 62) {
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[bitArray appendBits:self.binaryShiftByteCount - 31 numBits:16];
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} else if (i == 0) {
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// 1 <= binaryShiftByteCode <= 62
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[bitArray appendBits:MIN(self.binaryShiftByteCount, 31) numBits:5];
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} else {
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// 32 <= binaryShiftCount <= 62 and i == 31
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[bitArray appendBits:self.binaryShiftByteCount - 31 numBits:5];
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}
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}
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[bitArray appendBits:text.array[self.binaryShiftStart + i] numBits:8];
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}
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}
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@end
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