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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_quota_usageinfo_h__
#define mozilla_dom_quota_usageinfo_h__
#include "mozilla/dom/quota/QuotaCommon.h"
#include "mozilla/Atomics.h"
#include "mozilla/CheckedInt.h"
BEGIN_QUOTA_NAMESPACE
class UsageInfo
{
public:
UsageInfo()
: mDatabaseUsage(0)
, mFileUsage(0)
, mLimit(0)
{ }
virtual ~UsageInfo()
{ }
void
Append(const UsageInfo& aUsageInfo)
{
IncrementUsage(&mDatabaseUsage, aUsageInfo.mDatabaseUsage);
IncrementUsage(&mFileUsage, aUsageInfo.mFileUsage);
}
void
AppendToDatabaseUsage(uint64_t aUsage)
{
IncrementUsage(&mDatabaseUsage, aUsage);
}
void
AppendToFileUsage(uint64_t aUsage)
{
IncrementUsage(&mFileUsage, aUsage);
}
void
SetLimit(uint64_t aLimit)
{
mLimit = aLimit;
}
uint64_t
DatabaseUsage()
{
return mDatabaseUsage;
}
uint64_t
FileUsage()
{
return mFileUsage;
}
uint64_t
Limit()
{
return mLimit;
}
uint64_t
TotalUsage()
{
uint64_t totalUsage = mDatabaseUsage;
IncrementUsage(&totalUsage, mFileUsage);
return totalUsage;
}
void
ResetUsage()
{
mDatabaseUsage = 0;
mFileUsage = 0;
}
static void
IncrementUsage(uint64_t* aUsage, uint64_t aDelta)
{
MOZ_ASSERT(aUsage);
CheckedUint64 value = *aUsage;
value += aDelta;
if (value.isValid()) {
*aUsage = value.value();
} else {
*aUsage = UINT64_MAX;
}
}
private:
uint64_t mDatabaseUsage;
uint64_t mFileUsage;
uint64_t mLimit;
};
END_QUOTA_NAMESPACE
#endif // mozilla_dom_quota_usageinfo_h__
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