[Cronet] Implement getOutputStream in CronetHttpURLConnection

components/cronet/android/java/src/org/chromium/net/urlconnection/CronetOutputStream.java

Index: components/cronet/android/java/src/org/chromium/net/urlconnection/CronetOutputStream.java
diff --git a/components/cronet/android/java/src/org/chromium/net/urlconnection/CronetOutputStream.java b/components/cronet/android/java/src/org/chromium/net/urlconnection/CronetOutputStream.java
new file mode 100644
index 0000000000000000000000000000000000000000..6abb1a37db837a380136a2f77638894e2b763b4a
--- /dev/null
+++ b/components/cronet/android/java/src/org/chromium/net/urlconnection/CronetOutputStream.java
@@ -0,0 +1,90 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.net.urlconnection;
+
+import org.chromium.net.UploadDataProvider;
+import org.chromium.net.UploadDataSink;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+/**
+ * An implementation of {@link java.io.OutputStream} to send data to a server,
+ * when {@link CronetHttpURLConnection#setFixedLengthStreamingMode} is used.
+ * This implementation does not buffer entire request body in memory.
+ */
+final class CronetOutputStream extends OutputStream implements UploadDataProvider {
+    // CronetUploadStream buffers up to this value and wait for UploadDataStream

[pauljensen, 2015/03/04 16:44:11]

What is CronetUploadStream?  Do you mean CronetUploadDataStream?

[xunjieli, 2015/03/05 17:43:11]

Done. Sorry, it should be CronetOutputStream. 

+    // to consume the data.
+    private static int sDefaultBufferLength = 2048;
+    private final CronetHttpURLConnection mConnection;
+    private final long mContentLength;
+    private final ByteBuffer mBuffer;
+    private long mBytesReceived;
+
+    /**
+     * Packaged protected constructor.
+     * @param connection The CronetHttpURLConnection object.
+     * @param contentLength The content length of the request body. Non-zero for
+     *            non-chunked upload.
+     */
+    CronetOutputStream(CronetHttpURLConnection connection, long contentLength) {
+        if (connection == null) {
+            throw new NullPointerException();
+        }
+        if (contentLength < 0) {
+            throw new IllegalArgumentException(
+                    "Content length must be larger than 0 for non-chunked upload.");
+        }
+        mContentLength = contentLength;
+        int bufferSize = (int) Math.min(mContentLength, sDefaultBufferLength);
+        mBuffer = ByteBuffer.allocate(bufferSize);
+        mConnection = connection;
+        mBytesReceived = 0;
+    }
+
+    @Override
+    public long getLength() {
+        return mContentLength;
+    }
+
+    @Override
+    public void read(UploadDataSink uploadDataSink, ByteBuffer byteBuffer) {
+        mBuffer.flip();
+        byteBuffer.put(mBuffer);
+        // Reuse this buffer.
+        mBuffer.clear();
+        uploadDataSink.onReadSucceeded(false);
+        // Wait for more data if not enough data is received.
+        if (mBytesReceived < mContentLength) {
+            mConnection.waitForPostData();
+        }
+    }
+
+    @Override
+    public void rewind(UploadDataSink uploadDataSink) {
+        uploadDataSink.onRewindError(null);
+    }
+
+    @Override
+    public void write(int oneByte) throws IOException {
+        if (mBuffer.position() == mBuffer.limit()) {
+            // Wait until buffer is consumed.
+            mConnection.waitForPostDataConsumed();
+        }
+        mBuffer.put((byte) oneByte);
+        mBytesReceived++;
+        if (mBytesReceived == mContentLength) {
+            // Entire post data has been received. Now wait for network stack to
+            // consume it.
+            mConnection.waitForPostDataConsumed();
+        }
+    }
+
+    static void setDefaultBufferLengthForTesting(int bufferLength) {
+        sDefaultBufferLength = bufferLength;
+    }
+}