Turn FileDescriptorInfo a collection class

content/browser/file_descriptor_info_impl.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 "content/browser/file_descriptor_info_impl.h"
+
+namespace content {
+
+// static
+scoped_ptr<FileDescriptorInfo> FileDescriptorInfoImpl::Create() {
+  return scoped_ptr<FileDescriptorInfo>(new FileDescriptorInfoImpl());
+}
+
+FileDescriptorInfoImpl::FileDescriptorInfoImpl() {
+}
+
+FileDescriptorInfoImpl::~FileDescriptorInfoImpl() {
+}
+
+void FileDescriptorInfoImpl::Share(int id, base::PlatformFile fd) {
+  AddToMapping(id, fd);
+}
+
+void FileDescriptorInfoImpl::Transfer(int id, base::ScopedFD fd) {
+  AddToMapping(id, fd.get());
+  owned_descriptors_.push_back(new base::ScopedFD(fd.Pass()));
+}
+
+base::PlatformFile FileDescriptorInfoImpl::GetFDAt(size_t i) const {
+  return mapping_[i].first;
+}
+
+int FileDescriptorInfoImpl::GetIDAt(size_t i) const {
+  return mapping_[i].second;
+}
+
+size_t FileDescriptorInfoImpl::GetMappingSize() const {
+  return mapping_.size();
+}
+
+bool FileDescriptorInfoImpl::HasID(int id) const {
+  for (unsigned i = 0; i < mapping_.size(); ++i) {
+    if (mapping_[i].second == id)
+      return true;
+  }
+
+  return false;
+}
+
+void FileDescriptorInfoImpl::AddToMapping(int id, base::PlatformFile fd) {
+  DCHECK(!HasID(id));
+  mapping_.push_back(std::make_pair(fd, id));
+}
+
+const base::FileHandleMappingVector& FileDescriptorInfoImpl::GetMapping()
+    const {
+  return mapping_;
+}
+
+base::FileHandleMappingVector
+FileDescriptorInfoImpl::GetMappingWithIDAdjustment(int delta) const {
+  base::FileHandleMappingVector result = mapping_;
+  // Adding delta to each ID.
+  for (unsigned i = 0; i < mapping_.size(); ++i)
+    result[i].second += delta;
+  return result;
+}
+
+}  // namespace content