1 files changed, 144 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/compress/compressors/lzma/LZMACompressorInputStream.java b/src/main/java/org/apache/commons/compress/compressors/lzma/LZMACompressorInputStream.java
new file mode 100644
index 000000000..794e3a540
--- /dev/null
+++ b/src/main/java/org/apache/commons/compress/compressors/lzma/LZMACompressorInputStream.java
@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.commons.compress.compressors.lzma;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.apache.commons.compress.MemoryLimitException;
+import org.tukaani.xz.LZMAInputStream;
+
+import org.apache.commons.compress.compressors.CompressorInputStream;
+import org.apache.commons.compress.utils.CountingInputStream;
+import org.apache.commons.compress.utils.IOUtils;
+import org.apache.commons.compress.utils.InputStreamStatistics;
+
+/**
+ * LZMA decompressor.
+ * @since 1.6
+ */
+public class LZMACompressorInputStream extends CompressorInputStream
+    implements InputStreamStatistics {
+
+    private final CountingInputStream countingStream;
+    private final InputStream in;
+
+    /**
+     * Creates a new input stream that decompresses LZMA-compressed data
+     * from the specified input stream.
+     *
+     * @param       inputStream where to read the compressed data
+     *
+     * @throws      IOException if the input is not in the .lzma format,
+     *                          the input is corrupt or truncated, the .lzma
+     *                          headers specify sizes that are not supported
+     *                          by this implementation, or the underlying
+     *                          <code>inputStream</code> throws an exception
+     */
+    public LZMACompressorInputStream(final InputStream inputStream)
+            throws IOException {
+        in = new LZMAInputStream(countingStream = new CountingInputStream(inputStream), -1);
+    }
+
+    /**
+     * Creates a new input stream that decompresses LZMA-compressed data
+     * from the specified input stream.
+     *
+     * @param       inputStream where to read the compressed data
+     *
+     * @param       memoryLimitInKb calculated memory use threshold.  Throws MemoryLimitException
+     *                            if calculate memory use is above this threshold
+     *
+     * @throws      IOException if the input is not in the .lzma format,
+     *                          the input is corrupt or truncated, the .lzma
+     *                          headers specify sizes that are not supported
+     *                          by this implementation, or the underlying
+     *                          <code>inputStream</code> throws an exception
+     *
+     * @since 1.14
+     */
+    public LZMACompressorInputStream(final InputStream inputStream, int memoryLimitInKb)
+            throws IOException {
+        try {
+            in = new LZMAInputStream(countingStream = new CountingInputStream(inputStream), memoryLimitInKb);
+        } catch (org.tukaani.xz.MemoryLimitException e) {
+            //convert to commons-compress exception
+            throw new MemoryLimitException(e.getMemoryNeeded(), e.getMemoryLimit(), e);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int read() throws IOException {
+        final int ret = in.read();
+        count(ret == -1 ? 0 : 1);
+        return ret;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int read(final byte[] buf, final int off, final int len) throws IOException {
+        final int ret = in.read(buf, off, len);
+        count(ret);
+        return ret;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public long skip(final long n) throws IOException {
+        return IOUtils.skip(in, n);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int available() throws IOException {
+        return in.available();
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void close() throws IOException {
+        in.close();
+    }
+
+    /**
+     * @since 1.17
+     */
+    @Override
+    public long getCompressedCount() {
+        return countingStream.getBytesRead();
+    }
+
+    /**
+     * Checks if the signature matches what is expected for an lzma file.
+     *
+     * @param signature
+     *            the bytes to check
+     * @param length
+     *            the number of bytes to check
+     * @return true, if this stream is an lzma  compressed stream, false otherwise
+     *
+     * @since 1.10
+     */
+    public static boolean matches(final byte[] signature, final int length) {
+        return signature != null && length >= 3 &&
+                signature[0] == 0x5d && signature[1] == 0 &&
+                signature[2] == 0;
+    }
+}