/*
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* Copyright 2013 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 SimpleToken from './SimpleToken';
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export default /*final*/ class BinaryShiftToken extends SimpleToken {
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constructor(previous, binaryShiftStart, binaryShiftByteCount) {
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super(previous, 0, 0);
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this.binaryShiftStart = binaryShiftStart;
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this.binaryShiftByteCount = binaryShiftByteCount;
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}
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/**
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* @Override
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*/
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appendTo(bitArray, text) {
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for (let i = 0; i < this.binaryShiftByteCount; i++) {
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if (i === 0 || (i === 31 && this.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, 5); // BINARY_SHIFT
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if (this.binaryShiftByteCount > 62) {
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bitArray.appendBits(this.binaryShiftByteCount - 31, 16);
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}
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else if (i === 0) {
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// 1 <= binaryShiftByteCode <= 62
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bitArray.appendBits(Math.min(this.binaryShiftByteCount, 31), 5);
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}
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else {
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// 32 <= binaryShiftCount <= 62 and i == 31
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bitArray.appendBits(this.binaryShiftByteCount - 31, 5);
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}
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}
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bitArray.appendBits(text[this.binaryShiftStart + i], 8);
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}
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}
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addBinaryShift(start, byteCount) {
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// int bitCount = (byteCount * 8) + (byteCount <= 31 ? 10 : byteCount <= 62 ? 20 : 21);
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return new BinaryShiftToken(this, start, byteCount);
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}
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/**
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* @Override
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*/
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toString() {
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return '<' + this.binaryShiftStart + '::' + (this.binaryShiftStart + this.binaryShiftByteCount - 1) + '>';
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}
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}
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