chrome/browser/media_galleries/linux/snapshot_file_details.cc

   1 // Copyright 2013 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 "chrome/browser/media_galleries/linux/snapshot_file_details.h"
   6
   7 #include "base/numerics/safe_conversions.h"
   8
   9 ////////////////////////////////////////////////////////////////////////////////
  10 //                             SnapshotRequestInfo                            //
  11 ////////////////////////////////////////////////////////////////////////////////
  12
  13 SnapshotRequestInfo::SnapshotRequestInfo(
  14     const std::string& device_file_path,
  15     const base::FilePath& snapshot_file_path,
  16     const MTPDeviceAsyncDelegate::CreateSnapshotFileSuccessCallback&
  17         success_callback,
  18     const MTPDeviceAsyncDelegate::ErrorCallback& error_callback)
  19     : device_file_path(device_file_path),
  20       snapshot_file_path(snapshot_file_path),
  21       success_callback(success_callback),
  22       error_callback(error_callback) {
  23 }
  24
  25 SnapshotRequestInfo::~SnapshotRequestInfo() {
  26 }
  27
  28 ////////////////////////////////////////////////////////////////////////////////
  29 //                             SnapshotFileDetails                            //
  30 ////////////////////////////////////////////////////////////////////////////////
  31
  32 SnapshotFileDetails::SnapshotFileDetails(
  33     const SnapshotRequestInfo& request_info,
  34     const base::PlatformFileInfo& file_info)
  35     : request_info_(request_info),
  36       file_info_(file_info),
  37       bytes_written_(0),
  38       error_occurred_(false) {
  39 }
  40
  41 SnapshotFileDetails::~SnapshotFileDetails() {
  42 }
  43
  44 void SnapshotFileDetails::set_error_occurred(bool error) {
  45   error_occurred_ = error;
  46 }
  47
  48 bool SnapshotFileDetails::AddBytesWritten(uint32 bytes_written) {
  49   if ((bytes_written == 0) ||
  50       (bytes_written_ > kuint32max - bytes_written) ||
  51       (bytes_written_ + bytes_written > file_info_.size))
  52     return false;
  53
  54   bytes_written_ += bytes_written;
  55   return true;
  56 }
  57
  58 bool SnapshotFileDetails::IsSnapshotFileWriteComplete() const {
  59   return !error_occurred_ && (bytes_written_ == file_info_.size);
  60 }
  61
  62 uint32 SnapshotFileDetails::BytesToRead() const {
  63   // Read data in 1MB chunks.
  64   static const uint32 kReadChunkSize = 1024 * 1024;
  65   return std::min(
  66       kReadChunkSize,
  67       base::checked_cast<uint32>(file_info_.size) - bytes_written_);
  68 }