Revert 244857 "net: Remove classes which were used only by Chrom..."

trunk/src/net/base/upload_file_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_file_element_reader.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/location.h"
 #include "base/task_runner_util.h"
@@ skipping 229 matching lines @@
 UploadFileElementReader::ScopedOverridingContentLengthForTests::
 ScopedOverridingContentLengthForTests(uint64 value) {
   overriding_content_length = value;
 }
 
 UploadFileElementReader::ScopedOverridingContentLengthForTests::
 ~ScopedOverridingContentLengthForTests() {
   overriding_content_length = 0;
 }
 
+UploadFileElementReaderSync::UploadFileElementReaderSync(
+    const base::FilePath& path,
+    uint64 range_offset,
+    uint64 range_length,
+    const base::Time& expected_modification_time)
+    : path_(path),
+      range_offset_(range_offset),
+      range_length_(range_length),
+      expected_modification_time_(expected_modification_time),
+      content_length_(0),
+      bytes_remaining_(0) {
+}
+
+UploadFileElementReaderSync::~UploadFileElementReaderSync() {
+}
+
+int UploadFileElementReaderSync::Init(const CompletionCallback& callback) {
+  bytes_remaining_ = 0;
+  content_length_ = 0;
+  file_stream_.reset();
+
+  const int result = InitInternal(path_, range_offset_, range_length_,
+                                  expected_modification_time_,
+                                  &file_stream_, &content_length_);
+  bytes_remaining_ = GetContentLength();
+  return result;
+}
+
+uint64 UploadFileElementReaderSync::GetContentLength() const {
+  return content_length_;
+}
+
+uint64 UploadFileElementReaderSync::BytesRemaining() const {
+  return bytes_remaining_;
+}
+
+int UploadFileElementReaderSync::Read(IOBuffer* buf,
+                                      int buf_length,
+                                      const CompletionCallback& callback) {
+  const int result = ReadInternal(buf, buf_length, BytesRemaining(),
+                                  file_stream_.get());
+  if (result > 0) {
+    DCHECK_GE(bytes_remaining_, static_cast<uint64>(result));
+    bytes_remaining_ -= result;
+  }
+  return result;
+}
+
 }  // namespace net