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copied!<p>According to the specification, <a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/GZIPInputStream.html" rel="nofollow"><code>GZIPInputStream</code></a> is a subclass of <a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/InflaterInputStream.html" rel="nofollow"><code>InflaterInputStream</code></a>. <code>InflaterInputStream</code> has a <a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/InflaterInputStream.html#inf" rel="nofollow"><code>protected Inflater inf</code></a> field that is the <a href="http://docs.oracle.com/javase/6/docs/api/java/util/zip/Inflater.html" rel="nofollow"><code>Inflater</code></a> used for the decompression work. <a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html#getBytesRead%28%29" rel="nofollow"><code>Inflater.getBytesRead</code></a> should be particularly useful for your purposes.</p> <p>Unfortunately, <code>GZIPInputStream</code> does not expose <code>inf</code>, so probably you'll have to create your own subclass and expose the <code>Inflater</code>, e.g.</p> <pre><code>public final class ExposedGZIPInputStream extends GZIPInputStream { public ExposedGZIPInputStream(final InputStream stream) { super(stream); } public ExposedGZIPInputStream(final InputStream stream, final int n) { super(stream, n); } public Inflater inflater() { return super.inf; } } ... final ExposedGZIPInputStream gzip = new ExposedGZIPInputStream(...); ... final Inflater inflater = gzip.inflater(); final long read = inflater.getBytesRead(); </code></pre>

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