com.google.zxing.aztec.encoder.BinaryShiftToken Maven / Gradle / Ivy
/*
* Copyright 2013 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.aztec.encoder;
import com.google.zxing.common.BitArray;
final class BinaryShiftToken extends Token {
private final short binaryShiftStart;
private final short binaryShiftByteCount;
BinaryShiftToken(Token previous,
int binaryShiftStart,
int binaryShiftByteCount) {
super(previous);
this.binaryShiftStart = (short) binaryShiftStart;
this.binaryShiftByteCount = (short) binaryShiftByteCount;
}
@Override
public void appendTo(BitArray bitArray, byte[] text) {
for (int i = 0; i < binaryShiftByteCount; i++) {
if (i == 0 || (i == 31 && binaryShiftByteCount <= 62)) {
// We need a header before the first character, and before
// character 31 when the total byte code is <= 62
bitArray.appendBits(31, 5); // BINARY_SHIFT
if (binaryShiftByteCount > 62) {
bitArray.appendBits(binaryShiftByteCount - 31, 16);
} else if (i == 0) {
// 1 <= binaryShiftByteCode <= 62
bitArray.appendBits(Math.min(binaryShiftByteCount, 31), 5);
} else {
// 32 <= binaryShiftCount <= 62 and i == 31
bitArray.appendBits(binaryShiftByteCount - 31, 5);
}
}
bitArray.appendBits(text[binaryShiftStart + i], 8);
}
}
@Override
public String toString() {
return "<" + binaryShiftStart + "::" + (binaryShiftStart + binaryShiftByteCount - 1) + '>';
}
}