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1 | /*
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2 | * RangeDecoderFromStream
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3 | *
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4 | * Authors: Lasse Collin <lasse.collin@tukaani.org>
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5 | * Igor Pavlov <http://7-zip.org/>
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6 | *
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7 | * This file has been put into the public domain.
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8 | * You can do whatever you want with this file.
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9 | */
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10 |
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11 | package org.tukaani.xz.rangecoder;
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12 |
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13 | import java.io.InputStream;
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14 | import java.io.DataInputStream;
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15 | import java.io.IOException;
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16 | import org.tukaani.xz.CorruptedInputException;
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17 |
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18 | public final class RangeDecoderFromStream extends RangeDecoder {
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19 | private final DataInputStream inData;
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20 |
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21 | public RangeDecoderFromStream(InputStream in) throws IOException {
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22 | inData = new DataInputStream(in);
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23 |
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24 | if (inData.readUnsignedByte() != 0x00)
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25 | throw new CorruptedInputException();
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26 |
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27 | code = inData.readInt();
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28 | range = 0xFFFFFFFF;
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29 | }
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30 |
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31 | public boolean isFinished() {
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32 | return code == 0;
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33 | }
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34 |
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35 | public void normalize() throws IOException {
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36 | if ((range & TOP_MASK) == 0) {
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37 | code = (code << SHIFT_BITS) | inData.readUnsignedByte();
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38 | range <<= SHIFT_BITS;
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39 | }
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40 | }
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41 | }
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