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// Copyright 2013 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 "webkit/browser/fileapi/quota/open_file_handle_context.h"
#include "base/file_util.h"
#include "webkit/browser/fileapi/quota/quota_reservation_buffer.h"
namespace fileapi {
OpenFileHandleContext::OpenFileHandleContext(
const base::FilePath& platform_path,
QuotaReservationBuffer* reservation_buffer)
: initial_file_size_(0),
maximum_written_offset_(0),
platform_path_(platform_path),
reservation_buffer_(reservation_buffer) {
DCHECK(sequence_checker_.CalledOnValidSequencedThread());
base::GetFileSize(platform_path, &initial_file_size_);
maximum_written_offset_ = initial_file_size_;
}
void OpenFileHandleContext::UpdateMaxWrittenOffset(
int64 offset,
int64* new_file_size,
int64* growth) {
DCHECK(sequence_checker_.CalledOnValidSequencedThread());
if (offset > maximum_written_offset_) {
*growth = offset - maximum_written_offset_;
maximum_written_offset_ = offset;
} else {
*growth = 0;
}
*new_file_size = maximum_written_offset_;
}
OpenFileHandleContext::~OpenFileHandleContext() {
DCHECK(sequence_checker_.CalledOnValidSequencedThread());
// TODO(tzik): Optimize this for single operation.
int64 file_size = 0;
base::GetFileSize(platform_path_, &file_size);
int64 usage_delta = file_size - initial_file_size_;
// |quota_consumption| may be greater than the recorded file growth when a
// plugin crashed before reporting its consumption.
// In this case, the reserved quota for the plugin should be handled as
// consumed quota.
int64 quota_consumption =
std::max(maximum_written_offset_, file_size) - initial_file_size_;
reservation_buffer_->CommitFileGrowth(quota_consumption, usage_delta);
reservation_buffer_->DetachOpenFileHandleContext(this);
}
} // namespace fileapi
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