Upstreaming AndroidProtocolAdapter.

chrome/browser/android/android_stream_reader_url_request_job.h

+// Copyright (c) 2012 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.
+
+#ifndef CHROME_BROWSER_ANDROID_ANDROID_STREAM_READER_URL_REQUEST_JOB_H_
+#define CHROME_BROWSER_ANDROID_ANDROID_STREAM_READER_URL_REQUEST_JOB_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/non_thread_safe.h"
+#include "net/http/http_byte_range.h"
+#include "net/url_request/url_request_job.h"
+
+namespace net {
+class URLRequest;
+}
+
+// A request job that reads data from a Java InputStream.
+class AndroidStreamReaderURLRequestJob : public net::URLRequestJob {
+ public:
+  /*
+   * We use a delegate so that we can share code for this job in slightly
+   * different contexts.
+   */
+  class Delegate {
+   public:
+    virtual base::android::ScopedJavaLocalRef<jobject> OpenInputStream(
+        JNIEnv* env,
+        net::URLRequest* request) = 0;
+
+    virtual bool GetMimeType(
+        JNIEnv* env,
+        net::URLRequest* request,
+        jobject stream,
+        std::string* mime_type) = 0;
+
+    virtual bool GetCharset(
+        JNIEnv* env,
+        net::URLRequest* request,
+        jobject stream,
+        std::string* charset) = 0;
+
+    virtual ~Delegate() {}
+  };
+
+  explicit AndroidStreamReaderURLRequestJob(net::URLRequest* request,
+                                            scoped_ptr<Delegate> delegate);
+
+  // Register JNI methods.
+  static bool InitJNIBindings(JNIEnv* env);
+
+  // URLRequestJob:
+  virtual void Start() OVERRIDE;
+  virtual bool ReadRawData(net::IOBuffer* buf,
+                           int buf_size,
+                           int* bytes_read) OVERRIDE;
+  virtual void SetExtraRequestHeaders(
+      const net::HttpRequestHeaders& headers) OVERRIDE;
+  virtual bool GetMimeType(std::string* mime_type) const OVERRIDE;
+  virtual bool GetCharset(std::string* charset) OVERRIDE;
+
+ protected:
+  virtual ~AndroidStreamReaderURLRequestJob();
+
+ private:
+  // Verify the requested range against the stream size.
+  bool VerifyRequestedRange(JNIEnv* env);
+
+  // Skip to the first byte of the requested read range.
+  bool SkipToRequestedRange(JNIEnv* env);
+
+  net::HttpByteRange byte_range_;
+  scoped_ptr<Delegate> delegate_;
+  base::android::ScopedJavaGlobalRef<jobject> stream_;
+  base::android::ScopedJavaGlobalRef<jbyteArray> buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(AndroidStreamReaderURLRequestJob);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_ANDROID_STREAM_READER_URL_REQUEST_JOB_H_