63 lines
1.8 KiB
Java
63 lines
1.8 KiB
Java
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/*
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* BCJDecoder
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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package org.tukaani.xz;
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import java.io.InputStream;
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import org.tukaani.xz.simple.*;
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class BCJDecoder extends BCJCoder implements FilterDecoder {
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private final long filterID;
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private final int startOffset;
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BCJDecoder(long filterID, byte[] props)
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throws UnsupportedOptionsException {
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assert isBCJFilterID(filterID);
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this.filterID = filterID;
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if (props.length == 0) {
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startOffset = 0;
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} else if (props.length == 4) {
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int n = 0;
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for (int i = 0; i < 4; ++i)
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n |= (props[i] & 0xFF) << (i * 8);
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startOffset = n;
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} else {
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throw new UnsupportedOptionsException(
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"Unsupported BCJ filter properties");
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}
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}
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public int getMemoryUsage() {
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return SimpleInputStream.getMemoryUsage();
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}
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public InputStream getInputStream(InputStream in) {
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SimpleFilter simpleFilter = null;
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if (filterID == X86_FILTER_ID)
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simpleFilter = new X86(false, startOffset);
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else if (filterID == POWERPC_FILTER_ID)
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simpleFilter = new PowerPC(false, startOffset);
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else if (filterID == IA64_FILTER_ID)
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simpleFilter = new IA64(false, startOffset);
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else if (filterID == ARM_FILTER_ID)
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simpleFilter = new ARM(false, startOffset);
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else if (filterID == ARMTHUMB_FILTER_ID)
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simpleFilter = new ARMThumb(false, startOffset);
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else if (filterID == SPARC_FILTER_ID)
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simpleFilter = new SPARC(false, startOffset);
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else
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assert false;
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return new SimpleInputStream(in, simpleFilter);
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}
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}
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