| 1 | /*
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| 2 | * BCJDecoder
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| 3 | *
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| 4 | * Author: Lasse Collin <lasse.collin@tukaani.org>
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| 5 | *
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| 6 | * This file has been put into the public domain.
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| 7 | * You can do whatever you want with this file.
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| 8 | */
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| 9 |
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| 10 | package org.tukaani.xz;
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| 11 |
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| 12 | import java.io.InputStream;
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| 13 | import org.tukaani.xz.simple.*;
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| 14 |
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| 15 | class BCJDecoder extends BCJCoder implements FilterDecoder {
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| 16 | private final long filterID;
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| 17 | private final int startOffset;
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| 18 |
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| 19 | BCJDecoder(long filterID, byte[] props)
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| 20 | throws UnsupportedOptionsException {
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| 21 | assert isBCJFilterID(filterID);
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| 22 | this.filterID = filterID;
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| 23 |
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| 24 | if (props.length == 0) {
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| 25 | startOffset = 0;
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| 26 | } else if (props.length == 4) {
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| 27 | int n = 0;
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| 28 | for (int i = 0; i < 4; ++i)
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| 29 | n |= (props[i] & 0xFF) << (i * 8);
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| 30 |
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| 31 | startOffset = n;
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| 32 | } else {
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| 33 | throw new UnsupportedOptionsException(
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| 34 | "Unsupported BCJ filter properties");
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| 35 | }
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| 36 | }
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| 37 |
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| 38 | public int getMemoryUsage() {
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| 39 | return SimpleInputStream.getMemoryUsage();
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| 40 | }
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| 41 |
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| 42 | public InputStream getInputStream(InputStream in, ArrayCache arrayCache) {
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| 43 | SimpleFilter simpleFilter = null;
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| 44 |
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| 45 | if (filterID == X86_FILTER_ID)
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| 46 | simpleFilter = new X86(false, startOffset);
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| 47 | else if (filterID == POWERPC_FILTER_ID)
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| 48 | simpleFilter = new PowerPC(false, startOffset);
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| 49 | else if (filterID == IA64_FILTER_ID)
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| 50 | simpleFilter = new IA64(false, startOffset);
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| 51 | else if (filterID == ARM_FILTER_ID)
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| 52 | simpleFilter = new ARM(false, startOffset);
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| 53 | else if (filterID == ARMTHUMB_FILTER_ID)
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| 54 | simpleFilter = new ARMThumb(false, startOffset);
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| 55 | else if (filterID == SPARC_FILTER_ID)
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| 56 | simpleFilter = new SPARC(false, startOffset);
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| 57 | else
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| 58 | assert false;
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| 59 |
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| 60 | return new SimpleInputStream(in, simpleFilter);
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| 61 | }
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| 62 | }
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