1 files changed, 107 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/compress/compressors/zstandard/ZstdCompressorInputStream.java b/src/main/java/org/apache/commons/compress/compressors/zstandard/ZstdCompressorInputStream.java
new file mode 100644
index 000000000..7a47f1000
--- /dev/null
+++ b/src/main/java/org/apache/commons/compress/compressors/zstandard/ZstdCompressorInputStream.java
@@ -0,0 +1,107 @@
+/*
+ * 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.zstandard;
+
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import com.github.luben.zstd.ZstdInputStream;
+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;
+
+/**
+ * {@link CompressorInputStream} implementation to decode Zstandard encoded stream.
+ * Library relies on <a href="https://github.com/luben/zstd-jni/">Zstandard JNI</a>
+ *
+ * @since 1.16
+ */
+public class ZstdCompressorInputStream extends CompressorInputStream
+    implements InputStreamStatistics {
+
+    private final CountingInputStream countingStream;
+    private final ZstdInputStream decIS;
+
+    public ZstdCompressorInputStream(final InputStream in) throws IOException {
+        this.decIS = new ZstdInputStream(countingStream = new CountingInputStream(in));
+    }
+
+    @Override
+    public int available() throws IOException {
+        return decIS.available();
+    }
+
+    @Override
+    public void close() throws IOException {
+        decIS.close();
+    }
+
+    @Override
+    public int read(final byte[] b) throws IOException {
+        return decIS.read(b);
+    }
+
+    @Override
+    public long skip(final long n) throws IOException {
+        return IOUtils.skip(decIS, n);
+    }
+
+    @Override
+    public void mark(final int readlimit) {
+        decIS.mark(readlimit);
+    }
+
+    @Override
+    public boolean markSupported() {
+        return decIS.markSupported();
+    }
+
+    @Override
+    public int read() throws IOException {
+        final int ret = decIS.read();
+        count(ret == -1 ? 0 : 1);
+        return ret;
+    }
+
+    @Override
+    public int read(final byte[] buf, final int off, final int len) throws IOException {
+        final int ret = decIS.read(buf, off, len);
+        count(ret);
+        return ret;
+    }
+
+    @Override
+    public String toString() {
+        return decIS.toString();
+    }
+
+    @Override
+    public void reset() throws IOException {
+        decIS.reset();
+    }
+
+    /**
+     * @since 1.17
+     */
+    @Override
+    public long getCompressedCount() {
+        return countingStream.getBytesRead();
+    }
+}