55 lines
1.6 KiB
Java
55 lines
1.6 KiB
Java
package eu.siacs.conversations.utils.zlib;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.zip.Inflater;
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import java.util.zip.InflaterInputStream;
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/**
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* ZLibInputStream is a zlib and input stream compatible version of an
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* InflaterInputStream. This class solves the incompatibility between
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* {@link InputStream#available()} and {@link InflaterInputStream#available()}.
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*/
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public class ZLibInputStream extends InflaterInputStream {
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/**
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* Construct a ZLibInputStream, reading data from the underlying stream.
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*
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* @param is
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* The {@code InputStream} to read data from.
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* @throws IOException
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* If an {@code IOException} occurs.
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*/
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public ZLibInputStream(InputStream is) throws IOException {
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super(is, new Inflater(), 512);
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}
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/**
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* Provide a more InputStream compatible version of available. A return
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* value of 1 means that it is likly to read one byte without blocking, 0
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* means that the system is known to block for more input.
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*
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* @return 0 if no data is available, 1 otherwise
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* @throws IOException
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*/
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@Override
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public int available() throws IOException {
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/*
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* This is one of the funny code blocks. InflaterInputStream.available
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* violates the contract of InputStream.available, which breaks kXML2.
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*
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* I'm not sure who's to blame, oracle/sun for a broken api or the
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* google guys for mixing a sun bug with a xml reader that can't handle
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* it....
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*
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* Anyway, this simple if breaks suns distorted reality, but helps to
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* use the api as intended.
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*/
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if (inf.needsInput()) {
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return 0;
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}
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return super.available();
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}
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}
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