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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/base/encoded_value_storage.h"
#include <cstring>
#include "mongo/base/data_type_endian.h"
#include "mongo/base/static_assert.h"
#include "mongo/platform/endian.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
// Simplistic encoded value view and value classes to test EncodedValueStorage
namespace EncodedValueStorageTest {
#pragma pack(1)
struct Layout {
uint32_t native;
uint32_t le;
uint32_t be;
};
#pragma pack()
class ConstView {
public:
typedef ConstDataView view_type;
ConstView(const char* data) : _data(data) {}
const char* view2ptr() const {
return data().view();
}
uint32_t getNative() {
return data().read<uint32_t>(offsetof(Layout, native));
}
uint32_t getLE() {
return data().read<LittleEndian<uint32_t>>(offsetof(Layout, le));
}
uint32_t getBE() {
return data().read<BigEndian<uint32_t>>(offsetof(Layout, be));
}
protected:
const view_type& data() const {
return _data;
}
private:
view_type _data;
};
class View : public ConstView {
public:
typedef DataView view_type;
View(char* data) : ConstView(data) {}
using ConstView::view2ptr;
char* view2ptr() {
return data().view();
}
void setNative(uint32_t value) {
data().write(value, offsetof(Layout, native));
}
void setLE(uint32_t value) {
data().write(tagLittleEndian(value), offsetof(Layout, le));
}
void setBE(uint32_t value) {
data().write(tagBigEndian(value), offsetof(Layout, be));
}
private:
view_type data() const {
return const_cast<char*>(ConstView::view2ptr());
}
};
class Value : public EncodedValueStorage<Layout, ConstView, View> {
public:
Value() {
MONGO_STATIC_ASSERT(sizeof(Value) == sizeof(Layout));
}
Value(ZeroInitTag_t zit) : EncodedValueStorage<Layout, ConstView, View>(zit) {}
};
}
TEST(EncodedValueStorage, EncodedValueStorage) {
EncodedValueStorageTest::Value raw;
EncodedValueStorageTest::Value zerod(kZeroInitTag);
char buf[sizeof(EncodedValueStorageTest::Layout)] = {0};
ASSERT_EQUALS(raw.view().view2ptr(), raw.constView().view2ptr());
// ensure zeroing with the init tag works
ASSERT_EQUALS(std::memcmp(zerod.view().view2ptr(), buf, sizeof(buf)), 0);
// see if value assignment and view() works
zerod.view().setNative(1234);
EncodedValueStorageTest::View(buf).setNative(1234);
raw = zerod;
ASSERT_EQUALS(std::memcmp(raw.view().view2ptr(), buf, sizeof(buf)), 0);
// see if view() and constView() work appropriately
raw.view().setNative(1);
raw.view().setLE(2);
raw.view().setBE(3);
ASSERT_EQUALS(static_cast<uint32_t>(1), raw.constView().getNative());
ASSERT_EQUALS(static_cast<uint32_t>(2), raw.constView().getLE());
ASSERT_EQUALS(static_cast<uint32_t>(3), raw.constView().getBE());
}
} // namespace mongo
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