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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),
append_mode_write_amount_(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_;
}
int64 OpenFileHandleContext::UpdateMaxWrittenOffset(int64 offset) {
DCHECK(sequence_checker_.CalledOnValidSequencedThread());
if (offset <= maximum_written_offset_)
return 0;
int64 growth = offset - maximum_written_offset_;
maximum_written_offset_ = offset;
return growth;
}
void OpenFileHandleContext::AddAppendModeWriteAmount(int64 amount) {
DCHECK(sequence_checker_.CalledOnValidSequencedThread());
append_mode_write_amount_ += amount;
}
int64 OpenFileHandleContext::GetEstimatedFileSize() const {
DCHECK(sequence_checker_.CalledOnValidSequencedThread());
return maximum_written_offset_ + append_mode_write_amount_;
}
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_;
// |reserved_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 reserved_quota_consumption =
std::max(GetEstimatedFileSize(), file_size) - initial_file_size_;
reservation_buffer_->CommitFileGrowth(
reserved_quota_consumption, usage_delta);
reservation_buffer_->DetachOpenFileHandleContext(this);
}
} // namespace fileapi
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