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#ifndef QPID_LINEARSTORE_JOURNAL_UTILS_REC_TAIL_H
#define QPID_LINEARSTORE_JOURNAL_UTILS_REC_TAIL_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include <stdint.h>
#include "rec_hdr.h"
#ifdef __cplusplus
extern "C"{
#endif
#pragma pack(1)
/**
* \brief Struct for data common to the tail of all records. The magic number
* used here is the binary inverse (1's complement) of the magic used in the
* record header; this minimizes possible confusion with other headers that may
* be present during recovery. The tail is used with all records that have either
* XIDs or data - ie any size-variable content. Currently the only records that
* do NOT use the tail are non-transactional dequeues and filler records.
*
* The checksum is used to verify the xid and/or data portion of the record
* on recovery, and excludes the header and tail.
*
* Record header info in binary format (24 bytes):
* <pre>
* 0 7
* +---+---+---+---+---+---+---+---+
* | ~(magic) | checksum |
* +---+---+---+---+---+---+---+---+
* | serial |
* +---+---+---+---+---+---+---+---+
* | rid |
* +---+---+---+---+---+---+---+---+
*
* ~(magic) = 1's compliment of magic of matching record header
* rid = Record ID of matching record header
* </pre>
*/
typedef struct rec_tail_t {
uint32_t _xmagic; /**< Binary inverse (1's complement) of hdr magic number */
uint32_t _checksum; /**< Checksum of xid and data (excluding header itself) */
uint64_t _serial; /**< Serial number for this journal file */
uint64_t _rid; /**< Record ID (rotating 64-bit counter) */
} rec_tail_t;
void rec_tail_init(rec_tail_t* dest, const uint32_t xmagic, const uint32_t checksum, const uint64_t serial,
const uint64_t rid);
void rec_tail_copy(rec_tail_t* dest, const rec_hdr_t* src, const uint32_t checksum);
int rec_tail_check(const rec_tail_t* tail, const rec_hdr_t* header, const uint32_t checksum);
#pragma pack()
#ifdef __cplusplus
}
#endif
#endif /* ifnedf QPID_LINEARSTORE_JOURNAL_UTILS_REC_TAIL_H */
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