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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 __MsiDatabase_h__
#define __MsiDatabase_h__
#include "mozilla/Maybe.h"
#include "mozilla/UniquePtr.h"
#include "nsWindowsHelpers.h"
#include <windows.h>
#include <msi.h>
#include <msiquery.h>
namespace mozilla {
class MsiDatabase final {
static UniquePtr<wchar_t[]> GetRecordString(MSIHANDLE aRecord,
UINT aFieldIndex);
nsAutoMsiHandle mDatabase;
MsiDatabase() = default;
explicit MsiDatabase(const wchar_t* aDatabasePath);
public:
// A callback function passed to ExecuteSingleColumnQuery uses this type
// to control the enumeration loop.
enum class CallbackResult { Continue, Stop };
static Maybe<MsiDatabase> FromProductId(const wchar_t* aProductId);
MsiDatabase(const MsiDatabase&) = delete;
MsiDatabase& operator=(const MsiDatabase&) = delete;
MsiDatabase(MsiDatabase&& aOther) : mDatabase(aOther.mDatabase.disown()) {}
MsiDatabase& operator=(MsiDatabase&& aOther) {
if (this != &aOther) {
mDatabase.own(aOther.mDatabase.disown());
}
return *this;
}
explicit operator bool() const;
template <typename CallbackT>
bool ExecuteSingleColumnQuery(const wchar_t* aQuery,
const CallbackT& aCallback) const {
MSIHANDLE handle;
UINT ret = ::MsiDatabaseOpenViewW(mDatabase, aQuery, &handle);
if (ret != ERROR_SUCCESS) {
return false;
}
nsAutoMsiHandle view(handle);
ret = ::MsiViewExecute(view, 0);
if (ret != ERROR_SUCCESS) {
return false;
}
for (;;) {
ret = ::MsiViewFetch(view, &handle);
if (ret == ERROR_NO_MORE_ITEMS) {
break;
} else if (ret != ERROR_SUCCESS) {
return false;
}
nsAutoMsiHandle record(handle);
UniquePtr<wchar_t[]> guidStr = GetRecordString(record, 1);
if (!guidStr) {
continue;
}
CallbackResult result = aCallback(guidStr.get());
if (result == CallbackResult::Continue) {
continue;
} else if (result == CallbackResult::Stop) {
break;
} else {
MOZ_ASSERT_UNREACHABLE("Unexpected CallbackResult.");
}
}
return true;
}
};
} // namespace mozilla
#endif // __MsiDatabase_h__
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