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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/data_cursor.h"
#include "mongo/base/data_type_endian.h"
#include "mongo/platform/endian.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
TEST(DataCursor, ConstDataCursor) {
char buf[100];
DataView(buf).write<uint16_t>(1);
DataView(buf).write<LittleEndian<uint32_t>>(2, sizeof(uint16_t));
DataView(buf).write<BigEndian<uint64_t>>(3, sizeof(uint16_t) + sizeof(uint32_t));
ConstDataCursor cdc(buf);
ASSERT_EQUALS(static_cast<uint16_t>(1), cdc.readAndAdvance<uint16_t>());
ASSERT_EQUALS(static_cast<uint32_t>(2), cdc.readAndAdvance<LittleEndian<uint32_t>>());
ASSERT_EQUALS(static_cast<uint64_t>(3), cdc.readAndAdvance<BigEndian<uint64_t>>());
// test skip()
cdc = buf;
cdc.skip<uint32_t>();
ASSERT_EQUALS(buf + sizeof(uint32_t), cdc.view());
// test x +
cdc = buf;
ASSERT_EQUALS(buf + sizeof(uint32_t), (cdc + sizeof(uint32_t)).view());
// test x -
cdc = buf + sizeof(uint32_t);
ASSERT_EQUALS(buf, (cdc - sizeof(uint32_t)).view());
// test x += and x -=
cdc = buf;
cdc += sizeof(uint32_t);
ASSERT_EQUALS(buf + sizeof(uint32_t), cdc.view());
cdc -= sizeof(uint16_t);
ASSERT_EQUALS(buf + sizeof(uint16_t), cdc.view());
// test ++x
cdc = buf;
ASSERT_EQUALS(buf + sizeof(uint8_t), (++cdc).view());
ASSERT_EQUALS(buf + sizeof(uint8_t), cdc.view());
// test x++
cdc = buf;
ASSERT_EQUALS(buf, (cdc++).view());
ASSERT_EQUALS(buf + sizeof(uint8_t), cdc.view());
// test --x
cdc = buf + sizeof(uint8_t);
ASSERT_EQUALS(buf, (--cdc).view());
ASSERT_EQUALS(buf, cdc.view());
// test x--
cdc = buf + sizeof(uint8_t);
ASSERT_EQUALS(buf + sizeof(uint8_t), (cdc--).view());
ASSERT_EQUALS(buf, cdc.view());
}
TEST(DataCursor, DataCursor) {
char buf[100];
DataCursor dc(buf);
dc.writeAndAdvance<uint16_t>(1);
dc.writeAndAdvance<LittleEndian<uint32_t>>(2);
dc.writeAndAdvance<BigEndian<uint64_t>>(3);
ConstDataCursor cdc(buf);
ASSERT_EQUALS(static_cast<uint16_t>(1), cdc.readAndAdvance<uint16_t>());
ASSERT_EQUALS(static_cast<uint32_t>(2), cdc.readAndAdvance<LittleEndian<uint32_t>>());
ASSERT_EQUALS(static_cast<uint64_t>(3), cdc.readAndAdvance<BigEndian<uint64_t>>());
}
} // namespace mongo
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