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// Copyright 2016 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 "chrome/installer/setup/progress_calculator.h"
#include <math.h>
#include "base/check_op.h"
// An install operation generally proceeds through the stages in order. A
// progress value is computed assuming all stages take an equal amount of
// time. Diff vs. full installs diverge early on but then rejoin.
int ProgressCalculator::Calculate(installer::InstallerStage stage) const {
DCHECK_GT(stage, last_stage_);
// mini_installer.exe has already extracted resources by the time setup.exe
// does any processing. Figure this takes ~5% of overall time (pure I/O).
constexpr double kMinProgress = 5.0;
constexpr double kMaxProgress = 100.0;
last_stage_ = stage;
static_assert(installer::NUM_STAGES > 1, "There must be more than one stage");
double fraction = static_cast<double>(stage) / (installer::NUM_STAGES - 1.0);
return round(((kMaxProgress - kMinProgress) * fraction) + kMinProgress);
}