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<div class="subTitle">org.tukaani.xz</div>
<h2 title="Class SeekableXZInputStream" class="title">Class SeekableXZInputStream</h2>
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<li><a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">org.tukaani.xz.SeekableInputStream</a></li>
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<li>org.tukaani.xz.SeekableXZInputStream</li>
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<pre>public class <span class="strong">SeekableXZInputStream</span>
extends <a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a></pre>
<div class="block">Decompresses a .xz file in random access mode.
This supports decompressing concatenated .xz files.
<p>
Each .xz file consist of one or more Streams. Each Stream consist of zero
or more Blocks. Each Stream contains an Index of Streams' Blocks.
The Indexes from all Streams are loaded in RAM by a constructor of this
class. A typical .xz file has only one Stream, and parsing its Index will
need only three or four seeks.
<p>
To make random access possible, the data in a .xz file must be splitted
into multiple Blocks of reasonable size. Decompression can only start at
a Block boundary. When seeking to an uncompressed position that is not at
a Block boundary, decompression starts at the beginning of the Block and
throws away data until the target position is reached. Thus, smaller Blocks
mean faster seeks to arbitrary uncompressed positions. On the other hand,
smaller Blocks mean worse compression. So one has to make a compromise
between random access speed and compression ratio.
<p>
Implementation note: This class uses linear search to locate the correct
Stream from the data structures in RAM. It was the simplest to implement
and should be fine as long as there aren't too many Streams. The correct
Block inside a Stream is located using binary search and thus is fast
even with a huge number of Blocks.
<h4>Memory usage</h4>
<p>
The amount of memory needed for the Indexes is taken into account when
checking the memory usage limit. Each Stream is calculated to need at
least 1 KiB of memory and each Block 16 bytes of memory, rounded up
to the next kibibyte. So unless the file has a huge number of Streams or
Blocks, these don't take significant amount of memory.
<h4>Creating random-accessible .xz files</h4>
<p>
When using <a href="../../../org/tukaani/xz/XZOutputStream.html" title="class in org.tukaani.xz"><code>XZOutputStream</code></a>, a new Block can be started by calling
its <a href="../../../org/tukaani/xz/XZOutputStream.html#endBlock()"><code>endBlock</code></a> method. If you know
that the decompressor will only need to seek to certain uncompressed
positions, it can be a good idea to start a new Block at (some of) these
positions (and only at these positions to get better compression ratio).
<p>
liblzma in XZ Utils supports starting a new Block with
<code>LZMA_FULL_FLUSH</code>. XZ Utils 5.1.1alpha added threaded
compression which creates multi-Block .xz files. XZ Utils 5.1.1alpha
also added the option <code>--block-size=SIZE</code> to the xz command
line tool. XZ Utils 5.1.2alpha added a partial implementation of
<code>--block-list=SIZES</code> which allows specifying sizes of
individual Blocks.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/tukaani/xz/SeekableFileInputStream.html" title="class in org.tukaani.xz"><code>SeekableFileInputStream</code></a>,
<a href="../../../org/tukaani/xz/XZInputStream.html" title="class in org.tukaani.xz"><code>XZInputStream</code></a>,
<a href="../../../org/tukaani/xz/XZOutputStream.html" title="class in org.tukaani.xz"><code>XZOutputStream</code></a></dd></dl>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#SeekableXZInputStream(org.tukaani.xz.SeekableInputStream)">SeekableXZInputStream</a></strong>(<a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a> in)</code>
<div class="block">Creates a new seekable XZ decompressor without a memory usage limit.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#SeekableXZInputStream(org.tukaani.xz.SeekableInputStream, int)">SeekableXZInputStream</a></strong>(<a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a> in,
int memoryLimit)</code>
<div class="block">Creates a new seekable XZ decomporessor with an optional
memory usage limit.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#available()">available</a></strong>()</code>
<div class="block">Returns the number of uncompressed bytes that can be read
without blocking.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#close()">close</a></strong>()</code>
<div class="block">Closes the stream and calls <code>in.close()</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockCheckType(int)">getBlockCheckType</a></strong>(int blockNumber)</code>
<div class="block">Gets integrity check type (Check ID) of the given Block.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockCompPos(int)">getBlockCompPos</a></strong>(int blockNumber)</code>
<div class="block">Gets the position where the given compressed Block starts in
the underlying .xz file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockCompSize(int)">getBlockCompSize</a></strong>(int blockNumber)</code>
<div class="block">Gets the compressed size of the given Block.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockCount()">getBlockCount</a></strong>()</code>
<div class="block">Gets the number of Blocks in the .xz file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockNumber(long)">getBlockNumber</a></strong>(long pos)</code>
<div class="block">Gets the number of the Block that contains the byte at the given
uncompressed position.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockPos(int)">getBlockPos</a></strong>(int blockNumber)</code>
<div class="block">Gets the uncompressed start position of the given Block.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getBlockSize(int)">getBlockSize</a></strong>(int blockNumber)</code>
<div class="block">Gets the uncompressed size of the given Block.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getCheckTypes()">getCheckTypes</a></strong>()</code>
<div class="block">Gets the types of integrity checks used in the .xz file.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getIndexMemoryUsage()">getIndexMemoryUsage</a></strong>()</code>
<div class="block">Gets the amount of memory in kibibytes (KiB) used by
the data structures needed to locate the XZ Blocks.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getLargestBlockSize()">getLargestBlockSize</a></strong>()</code>
<div class="block">Gets the uncompressed size of the largest XZ Block in bytes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getStreamCount()">getStreamCount</a></strong>()</code>
<div class="block">Gets the number of Streams in the .xz file.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#length()">length</a></strong>()</code>
<div class="block">Gets the uncompressed size of this input stream.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#position()">position</a></strong>()</code>
<div class="block">Gets the current uncompressed position in this input stream.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#read()">read</a></strong>()</code>
<div class="block">Decompresses the next byte from this input stream.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#read(byte[], int, int)">read</a></strong>(byte[] buf,
int off,
int len)</code>
<div class="block">Decompresses into an array of bytes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#seek(long)">seek</a></strong>(long pos)</code>
<div class="block">Seeks to the specified absolute uncompressed position in the stream.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#seekToBlock(int)">seekToBlock</a></strong>(int blockNumber)</code>
<div class="block">Seeks to the beginning of the given XZ Block.</div>
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<h3>Methods inherited from class org.tukaani.xz.<a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a></h3>
<code><a href="../../../org/tukaani/xz/SeekableInputStream.html#skip(long)">skip</a></code></li>
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<code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#mark(int)" title="class or interface in java.io">mark</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#markSupported()" title="class or interface in java.io">markSupported</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#read(byte[])" title="class or interface in java.io">read</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#reset()" title="class or interface in java.io">reset</a></code></li>
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<code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<h4>SeekableXZInputStream</h4>
<pre>public SeekableXZInputStream(<a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a> in)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Creates a new seekable XZ decompressor without a memory usage limit.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>in</code> - seekable input stream containing one or more
XZ Streams; the whole input stream is used</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/XZFormatException.html" title="class in org.tukaani.xz">XZFormatException</a></code> - input is not in the XZ format</dd>
<dd><code><a href="../../../org/tukaani/xz/CorruptedInputException.html" title="class in org.tukaani.xz">CorruptedInputException</a></code> - XZ data is corrupt or truncated</dd>
<dd><code><a href="../../../org/tukaani/xz/UnsupportedOptionsException.html" title="class in org.tukaani.xz">UnsupportedOptionsException</a></code> - XZ headers seem valid but they specify
options not supported by this implementation</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/EOFException.html?is-external=true" title="class or interface in java.io">EOFException</a></code> - less than 6 bytes of input was available
from <code>in</code>, or (unlikely) the size
of the underlying stream got smaller while
this was reading from it</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - may be thrown by <code>in</code></dd></dl>
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<h4>SeekableXZInputStream</h4>
<pre>public SeekableXZInputStream(<a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a> in,
int memoryLimit)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Creates a new seekable XZ decomporessor with an optional
memory usage limit.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>in</code> - seekable input stream containing one or more
XZ Streams; the whole input stream is used</dd><dd><code>memoryLimit</code> - memory usage limit in kibibytes (KiB)
or <code>-1</code> to impose no
memory usage limit</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/XZFormatException.html" title="class in org.tukaani.xz">XZFormatException</a></code> - input is not in the XZ format</dd>
<dd><code><a href="../../../org/tukaani/xz/CorruptedInputException.html" title="class in org.tukaani.xz">CorruptedInputException</a></code> - XZ data is corrupt or truncated</dd>
<dd><code><a href="../../../org/tukaani/xz/UnsupportedOptionsException.html" title="class in org.tukaani.xz">UnsupportedOptionsException</a></code> - XZ headers seem valid but they specify
options not supported by this implementation</dd>
<dd><code><a href="../../../org/tukaani/xz/MemoryLimitException.html" title="class in org.tukaani.xz">MemoryLimitException</a></code> - decoded XZ Indexes would need more memory
than allowed by the memory usage limit</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/EOFException.html?is-external=true" title="class or interface in java.io">EOFException</a></code> - less than 6 bytes of input was available
from <code>in</code>, or (unlikely) the size
of the underlying stream got smaller while
this was reading from it</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - may be thrown by <code>in</code></dd></dl>
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<h3>Method Detail</h3>
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<h4>getCheckTypes</h4>
<pre>public int getCheckTypes()</pre>
<div class="block">Gets the types of integrity checks used in the .xz file.
Multiple checks are possible only if there are multiple
concatenated XZ Streams.
<p>
The returned value has a bit set for every check type that is present.
For example, if CRC64 and SHA-256 were used, the return value is
<code>(1 << XZ.CHECK_CRC64)
| (1 << XZ.CHECK_SHA256)</code>.</div>
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<h4>getIndexMemoryUsage</h4>
<pre>public int getIndexMemoryUsage()</pre>
<div class="block">Gets the amount of memory in kibibytes (KiB) used by
the data structures needed to locate the XZ Blocks.
This is usually useless information but since it is calculated
for memory usage limit anyway, it is nice to make it available to too.</div>
</li>
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<h4>getLargestBlockSize</h4>
<pre>public long getLargestBlockSize()</pre>
<div class="block">Gets the uncompressed size of the largest XZ Block in bytes.
This can be useful if you want to check that the file doesn't
have huge XZ Blocks which could make seeking to arbitrary offsets
very slow. Note that huge Blocks don't automatically mean that
seeking would be slow, for example, seeking to the beginning of
any Block is always fast.</div>
</li>
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<a name="getStreamCount()">
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<h4>getStreamCount</h4>
<pre>public int getStreamCount()</pre>
<div class="block">Gets the number of Streams in the .xz file.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
<a name="getBlockCount()">
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<h4>getBlockCount</h4>
<pre>public int getBlockCount()</pre>
<div class="block">Gets the number of Blocks in the .xz file.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
<a name="getBlockPos(int)">
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<h4>getBlockPos</h4>
<pre>public long getBlockPos(int blockNumber)</pre>
<div class="block">Gets the uncompressed start position of the given Block.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - if
<code>blockNumber < 0</code> or
<code>blockNumber >= getBlockCount()</code>.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
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<h4>getBlockSize</h4>
<pre>public long getBlockSize(int blockNumber)</pre>
<div class="block">Gets the uncompressed size of the given Block.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - if
<code>blockNumber < 0</code> or
<code>blockNumber >= getBlockCount()</code>.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
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<h4>getBlockCompPos</h4>
<pre>public long getBlockCompPos(int blockNumber)</pre>
<div class="block">Gets the position where the given compressed Block starts in
the underlying .xz file.
This information is rarely useful to the users of this class.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - if
<code>blockNumber < 0</code> or
<code>blockNumber >= getBlockCount()</code>.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
<a name="getBlockCompSize(int)">
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<h4>getBlockCompSize</h4>
<pre>public long getBlockCompSize(int blockNumber)</pre>
<div class="block">Gets the compressed size of the given Block.
This together with the uncompressed size can be used to calculate
the compression ratio of the specific Block.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - if
<code>blockNumber < 0</code> or
<code>blockNumber >= getBlockCount()</code>.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
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<h4>getBlockCheckType</h4>
<pre>public int getBlockCheckType(int blockNumber)</pre>
<div class="block">Gets integrity check type (Check ID) of the given Block.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - if
<code>blockNumber < 0</code> or
<code>blockNumber >= getBlockCount()</code>.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/tukaani/xz/SeekableXZInputStream.html#getCheckTypes()"><code>getCheckTypes()</code></a></dd></dl>
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<h4>getBlockNumber</h4>
<pre>public int getBlockNumber(long pos)</pre>
<div class="block">Gets the number of the Block that contains the byte at the given
uncompressed position.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IndexOutOfBoundsException.html?is-external=true" title="class or interface in java.lang">IndexOutOfBoundsException</a></code> - if
<code>pos < 0</code> or
<code>pos >= length()</code>.</dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
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<h4>read</h4>
<pre>public int read()
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Decompresses the next byte from this input stream.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#read()" title="class or interface in java.io">read</a></code> in class <code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the next decompressed byte, or <code>-1</code>
to indicate the end of the compressed stream</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/CorruptedInputException.html" title="class in org.tukaani.xz">CorruptedInputException</a></code></dd>
<dd><code><a href="../../../org/tukaani/xz/UnsupportedOptionsException.html" title="class in org.tukaani.xz">UnsupportedOptionsException</a></code></dd>
<dd><code><a href="../../../org/tukaani/xz/MemoryLimitException.html" title="class in org.tukaani.xz">MemoryLimitException</a></code></dd>
<dd><code><a href="../../../org/tukaani/xz/XZIOException.html" title="class in org.tukaani.xz">XZIOException</a></code> - if the stream has been closed</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - may be thrown by <code>in</code></dd></dl>
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<h4>read</h4>
<pre>public int read(byte[] buf,
int off,
int len)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Decompresses into an array of bytes.
<p>
If <code>len</code> is zero, no bytes are read and <code>0</code>
is returned. Otherwise this will try to decompress <code>len</code>
bytes of uncompressed data. Less than <code>len</code> bytes may
be read only in the following situations:
<ul>
<li>The end of the compressed data was reached successfully.</li>
<li>An error is detected after at least one but less than
<code>len</code> bytes have already been successfully
decompressed. The next call with non-zero <code>len</code>
will immediately throw the pending exception.</li>
<li>An exception is thrown.</li>
</ul></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#read(byte[], int, int)" title="class or interface in java.io">read</a></code> in class <code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>buf</code> - target buffer for uncompressed data</dd><dd><code>off</code> - start offset in <code>buf</code></dd><dd><code>len</code> - maximum number of uncompressed bytes to read</dd>
<dt><span class="strong">Returns:</span></dt><dd>number of bytes read, or <code>-1</code> to indicate
the end of the compressed stream</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/CorruptedInputException.html" title="class in org.tukaani.xz">CorruptedInputException</a></code></dd>
<dd><code><a href="../../../org/tukaani/xz/UnsupportedOptionsException.html" title="class in org.tukaani.xz">UnsupportedOptionsException</a></code></dd>
<dd><code><a href="../../../org/tukaani/xz/MemoryLimitException.html" title="class in org.tukaani.xz">MemoryLimitException</a></code></dd>
<dd><code><a href="../../../org/tukaani/xz/XZIOException.html" title="class in org.tukaani.xz">XZIOException</a></code> - if the stream has been closed</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - may be thrown by <code>in</code></dd></dl>
</li>
</ul>
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<h4>available</h4>
<pre>public int available()
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Returns the number of uncompressed bytes that can be read
without blocking. The value is returned with an assumption
that the compressed input data will be valid. If the compressed
data is corrupt, <code>CorruptedInputException</code> may get
thrown before the number of bytes claimed to be available have
been read from this input stream.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#available()" title="class or interface in java.io">available</a></code> in class <code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the number of uncompressed bytes that can be read
without blocking</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
</li>
</ul>
<a name="close()">
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<ul class="blockList">
<li class="blockList">
<h4>close</h4>
<pre>public void close()
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Closes the stream and calls <code>in.close()</code>.
If the stream was already closed, this does nothing.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</a></code> in interface <code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/AutoCloseable.html?is-external=true#close()" title="class or interface in java.lang">close</a></code> in interface <code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true#close()" title="class or interface in java.io">close</a></code> in class <code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if thrown by <code>in.close()</code></dd></dl>
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<a name="length()">
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<h4>length</h4>
<pre>public long length()</pre>
<div class="block">Gets the uncompressed size of this input stream. If there are multiple
XZ Streams, the total uncompressed size of all XZ Streams is returned.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/tukaani/xz/SeekableInputStream.html#length()">length</a></code> in class <code><a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a></code></dd>
</dl>
</li>
</ul>
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<h4>position</h4>
<pre>public long position()
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Gets the current uncompressed position in this input stream.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/tukaani/xz/SeekableInputStream.html#position()">position</a></code> in class <code><a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/XZIOException.html" title="class in org.tukaani.xz">XZIOException</a></code> - if the stream has been closed</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
</li>
</ul>
<a name="seek(long)">
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<ul class="blockList">
<li class="blockList">
<h4>seek</h4>
<pre>public void seek(long pos)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Seeks to the specified absolute uncompressed position in the stream.
This only stores the new position, so this function itself is always
very fast. The actual seek is done when <code>read</code> is called
to read at least one byte.
<p>
Seeking past the end of the stream is possible. In that case
<code>read</code> will return <code>-1</code> to indicate
the end of the stream.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../org/tukaani/xz/SeekableInputStream.html#seek(long)">seek</a></code> in class <code><a href="../../../org/tukaani/xz/SeekableInputStream.html" title="class in org.tukaani.xz">SeekableInputStream</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>pos</code> - new uncompressed read position</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/XZIOException.html" title="class in org.tukaani.xz">XZIOException</a></code> - if <code>pos</code> is negative, or
if stream has been closed</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <code>pos</code> is negative or if
a stream-specific I/O error occurs</dd></dl>
</li>
</ul>
<a name="seekToBlock(int)">
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</a>
<ul class="blockListLast">
<li class="blockList">
<h4>seekToBlock</h4>
<pre>public void seekToBlock(int blockNumber)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Seeks to the beginning of the given XZ Block.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/tukaani/xz/XZIOException.html" title="class in org.tukaani.xz">XZIOException</a></code> - if <code>blockNumber < 0</code> or
<code>blockNumber >= getBlockCount()</code>,
or if stream has been closed</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd><dt><span class="strong">Since:</span></dt>
<dd>1.3</dd></dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
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<li>Summary: </li>
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