content/browser/file_descriptor_info_impl.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/file_descriptor_info_impl.h"
   6
   7 namespace content {
   8
   9 // static
  10 scoped_ptr<FileDescriptorInfo> FileDescriptorInfoImpl::Create() {
  11   return scoped_ptr<FileDescriptorInfo>(new FileDescriptorInfoImpl());
  12 }
  13
  14 FileDescriptorInfoImpl::FileDescriptorInfoImpl() {
  15 }
  16
  17 FileDescriptorInfoImpl::~FileDescriptorInfoImpl() {
  18 }
  19
  20 void FileDescriptorInfoImpl::Share(int id, base::PlatformFile fd) {
  21   AddToMapping(id, fd);
  22 }
  23
  24 void FileDescriptorInfoImpl::Transfer(int id, base::ScopedFD fd) {
  25   AddToMapping(id, fd.get());
  26   owned_descriptors_.push_back(new base::ScopedFD(fd.Pass()));
  27 }
  28
  29 base::PlatformFile FileDescriptorInfoImpl::GetFDAt(size_t i) const {
  30   return mapping_[i].first;
  31 }
  32
  33 int FileDescriptorInfoImpl::GetIDAt(size_t i) const {
  34   return mapping_[i].second;
  35 }
  36
  37 size_t FileDescriptorInfoImpl::GetMappingSize() const {
  38   return mapping_.size();
  39 }
  40
  41 bool FileDescriptorInfoImpl::HasID(int id) const {
  42   for (unsigned i = 0; i < mapping_.size(); ++i) {
  43     if (mapping_[i].second == id)
  44       return true;
  45   }
  46
  47   return false;
  48 }
  49
  50 bool FileDescriptorInfoImpl::OwnsFD(base::PlatformFile file) const {
  51   return owned_descriptors_.end() !=
  52          std::find_if(
  53              owned_descriptors_.begin(), owned_descriptors_.end(),
  54              [file](const base::ScopedFD* fd) { return fd->get() == file; });
  55 }
  56
  57 base::ScopedFD FileDescriptorInfoImpl::ReleaseFD(base::PlatformFile file) {
  58   DCHECK(OwnsFD(file));
  59
  60   base::ScopedFD fd;
  61   auto found = std::find_if(
  62       owned_descriptors_.begin(), owned_descriptors_.end(),
  63       [file](const base::ScopedFD* fd) { return fd->get() == file; });
  64
  65   (*found)->swap(fd);
  66   owned_descriptors_.erase(found);
  67
  68   return fd.Pass();
  69 }
  70
  71 void FileDescriptorInfoImpl::AddToMapping(int id, base::PlatformFile fd) {
  72   DCHECK(!HasID(id));
  73   mapping_.push_back(std::make_pair(fd, id));
  74 }
  75
  76 const base::FileHandleMappingVector& FileDescriptorInfoImpl::GetMapping()
  77     const {
  78   return mapping_;
  79 }
  80
  81 base::FileHandleMappingVector
  82 FileDescriptorInfoImpl::GetMappingWithIDAdjustment(int delta) const {
  83   base::FileHandleMappingVector result = mapping_;
  84   // Adding delta to each ID.
  85   for (unsigned i = 0; i < mapping_.size(); ++i)
  86     result[i].second += delta;
  87   return result;
  88 }
  89
  90 }  // namespace content