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[13350] | 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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