net: Make UploadDataStream::Read() asynchronous

net/base/upload_bytes_element_reader.cc

 // 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.
 
 #include "net/base/upload_bytes_element_reader.h"
 
 #include "base/logging.h"
+#include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 UploadBytesElementReader::UploadBytesElementReader(const char* bytes,
                                                    int bytes_length)
     : bytes_(bytes),
       bytes_length_(bytes_length),
       offset_(0) {
 }
@@ skipping 10 matching lines @@
 }
 
 uint64 UploadBytesElementReader::GetContentLength() const {
   return bytes_length_;
 }
 
 uint64 UploadBytesElementReader::BytesRemaining() const {
   return bytes_length_ - offset_;
 }
 
-int UploadBytesElementReader::ReadSync(char* buf, int buf_length) {
+bool UploadBytesElementReader::IsInMemory() const {
+  return true;
+}
+
+int UploadBytesElementReader::Read(IOBuffer* buf,
+                                   int buf_length,
+                                   const CompletionCallback& callback) {
+  DCHECK(!callback.is_null());
+  return ReadSync(buf, buf_length);
+}
+
+int UploadBytesElementReader::ReadSync(IOBuffer* buf, int buf_length) {
   DCHECK_LT(0, buf_length);
 
   const size_t num_bytes_to_read =
       std::min(BytesRemaining(), static_cast<uint64>(buf_length));
 
   // Check if we have anything to copy first, because we are getting
   // the address of an element in |bytes_| and that will throw an
   // exception if |bytes_| is an empty vector.
   if (num_bytes_to_read > 0)
-    memcpy(buf, bytes_ + offset_, num_bytes_to_read);
+    memcpy(buf->data(), bytes_ + offset_, num_bytes_to_read);
 
   offset_ += num_bytes_to_read;
   return num_bytes_to_read;
 }
 
-bool UploadBytesElementReader::IsInMemory() const {
-  return true;
-}
-
 }  // namespace net