1 files changed, 96 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/compress/compressors/CompressorInputStream.java b/src/main/java/org/apache/commons/compress/compressors/CompressorInputStream.java
new file mode 100644
index 000000000..67de705a2
--- /dev/null
+++ b/src/main/java/org/apache/commons/compress/compressors/CompressorInputStream.java
@@ -0,0 +1,96 @@
+/*
+ * 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;
+
+import java.io.InputStream;
+
+public abstract class CompressorInputStream extends InputStream {
+    private long bytesRead = 0;
+
+    /**
+     * Increments the counter of already read bytes.
+     * Doesn't increment if the EOF has been hit (read == -1)
+     *
+     * @param read the number of bytes read
+     *
+     * @since 1.1
+     */
+    protected void count(final int read) {
+        count((long) read);
+    }
+
+    /**
+     * Increments the counter of already read bytes.
+     * Doesn't increment if the EOF has been hit (read == -1)
+     *
+     * @param read the number of bytes read
+     */
+    protected void count(final long read) {
+        if (read != -1) {
+            bytesRead = bytesRead + read;
+        }
+    }
+
+    /**
+     * Decrements the counter of already read bytes.
+     *
+     * @param pushedBack the number of bytes pushed back.
+     * @since 1.7
+     */
+    protected void pushedBackBytes(final long pushedBack) {
+        bytesRead -= pushedBack;
+    }
+
+    /**
+     * Returns the current number of bytes read from this stream.
+     * @return the number of read bytes
+     * @deprecated this method may yield wrong results for large
+     * archives, use #getBytesRead instead
+     */
+    @Deprecated
+    public int getCount() {
+        return (int) bytesRead;
+    }
+
+    /**
+     * Returns the current number of bytes read from this stream.
+     * @return the number of read bytes
+     *
+     * @since 1.1
+     */
+    public long getBytesRead() {
+        return bytesRead;
+    }
+
+    /**
+     * Returns the amount of raw or compressed bytes read by the stream.
+     *
+     * <p>This implementation invokes {@link #getBytesRead}.</p>
+     *
+     * <p>Provides half of {@link
+     * org.apache.commons.compress.utils.InputStreamStatistics}
+     * without forcing subclasses to implement the other half.</p>
+     *
+     * @return the amount of decompressed bytes returned by the stream
+     * @since 1.17
+     */
+    public long getUncompressedCount() {
+        return getBytesRead();
+    }
+}