1 files changed, 132 insertions, 0 deletions
diff --git a/src/org/apache/http/impl/io/ContentLengthOutputStream.java b/src/org/apache/http/impl/io/ContentLengthOutputStream.java
new file mode 100644
index 0000000..afcb883
--- /dev/null
+++ b/src/org/apache/http/impl/io/ContentLengthOutputStream.java
@@ -0,0 +1,132 @@
+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/ContentLengthOutputStream.java $
+ * $Revision: 560343 $
+ * $Date: 2007-07-27 11:18:19 -0700 (Fri, 27 Jul 2007) $
+ *
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.http.impl.io;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.apache.http.io.SessionOutputBuffer;
+
+/**
+ * A stream wrapper that closes itself after a defined number of bytes.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ *
+ * @version $Revision: 560343 $
+ * 
+ * @since 4.0
+ */
+public class ContentLengthOutputStream extends OutputStream {
+    
+    /**
+     * Wrapped session outbut buffer.
+     */
+    private final SessionOutputBuffer out;
+
+    /**
+     * The maximum number of bytes that can be written the stream. Subsequent
+     * write operations will be ignored.
+     */
+    private final long contentLength;
+
+    /** Total bytes written */
+    private long total = 0;
+
+    /** True if the stream is closed. */
+    private boolean closed = false;
+
+    /**
+     * Creates a new length limited stream
+     *
+     * @param out The data transmitter to wrap
+     * @param contentLength The maximum number of bytes that can be written to
+     * the stream. Subsequent write operations will be ignored.
+     * 
+     * @since 4.0
+     */
+    public ContentLengthOutputStream(final SessionOutputBuffer out, long contentLength) {
+        super();
+        if (out == null) {
+            throw new IllegalArgumentException("Session output buffer may not be null");
+        }
+        if (contentLength < 0) {
+            throw new IllegalArgumentException("Content length may not be negative");
+        }
+        this.out = out;
+        this.contentLength = contentLength;
+    }
+
+    /**
+     * <p>Does not close the underlying socket output.</p>
+     * 
+     * @throws IOException If an I/O problem occurs.
+     */
+    public void close() throws IOException {
+        if (!this.closed) {
+            this.closed = true;
+            this.out.flush();
+        }
+    }
+
+    public void flush() throws IOException {
+        this.out.flush();
+    }
+
+    public void write(byte[] b, int off, int len) throws IOException {
+        if (this.closed) {
+            throw new IOException("Attempted write to closed stream.");
+        }
+        if (this.total < this.contentLength) {
+            long max = this.contentLength - this.total;
+            if (len > max) {
+                len = (int) max;
+            }
+            this.out.write(b, off, len);
+            this.total += len;
+        }
+    }
+
+    public void write(byte[] b) throws IOException {
+        write(b, 0, b.length);
+    }
+
+    public void write(int b) throws IOException {
+        if (this.closed) {
+            throw new IOException("Attempted write to closed stream.");
+        }
+        if (this.total < this.contentLength) {
+            this.out.write(b);
+            this.total++;
+        }
+    }
+    
+}