// Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
// SPDX-FileCopyrightText: 2024 Redict Contributors
// SPDX-FileCopyrightText: 2024 Salvatore Sanfilippo <antirez at gmail dot com>
//
// SPDX-License-Identifier: BSD-3-Clause
// SPDX-License-Identifier: LGPL-3.0-only

#ifndef __RDB_H
#define __RDB_H

#include <stdio.h>
#include "rio.h"

/* TBD: include only necessary headers. */
#include "server.h"

/* The current RDB version. When the format changes in a way that is no longer
 * backward compatible this number gets incremented. */
#define RDB_VERSION 12

/* Defines related to the dump file format. To store 32 bits lengths for short
 * keys requires a lot of space, so we check the most significant 2 bits of
 * the first byte to interpreter the length:
 *
 * 00|XXXXXX => if the two MSB are 00 the len is the 6 bits of this byte
 * 01|XXXXXX XXXXXXXX =>  01, the len is 14 bits, 6 bits + 8 bits of next byte
 * 10|000000 [32 bit integer] => A full 32 bit len in net byte order will follow
 * 10|000001 [64 bit integer] => A full 64 bit len in net byte order will follow
 * 11|OBKIND this means: specially encoded object will follow. The six bits
 *           number specify the kind of object that follows.
 *           See the RDB_ENC_* defines.
 *
 * Lengths up to 63 are stored using a single byte, most DB keys, and may
 * values, will fit inside. */
#define RDB_6BITLEN 0
#define RDB_14BITLEN 1
#define RDB_32BITLEN 0x80
#define RDB_64BITLEN 0x81
#define RDB_ENCVAL 3
#define RDB_LENERR UINT64_MAX

/* When a length of a string object stored on disk has the first two bits
 * set, the remaining six bits specify a special encoding for the object
 * accordingly to the following defines: */
#define RDB_ENC_INT8 0        /* 8 bit signed integer */
#define RDB_ENC_INT16 1       /* 16 bit signed integer */
#define RDB_ENC_INT32 2       /* 32 bit signed integer */
#define RDB_ENC_LZF 3         /* string compressed with FASTLZ */

/* Map object types to RDB object types. Macros starting with OBJ_ are for
 * memory storage and may change. Instead RDB types must be fixed because
 * we store them on disk. */
#define RDB_TYPE_STRING 0
#define RDB_TYPE_LIST   1
#define RDB_TYPE_SET    2
#define RDB_TYPE_ZSET   3
#define RDB_TYPE_HASH   4
#define RDB_TYPE_ZSET_2 5 /* ZSET version 2 with doubles stored in binary. */
#define RDB_TYPE_MODULE_PRE_GA 6 /* Used in 4.0 release candidates */
#define RDB_TYPE_MODULE_2 7 /* Module value with annotations for parsing without
                               the generating module being loaded. */
#define RDB_TYPE_HASH_ZIPMAP    9
#define RDB_TYPE_LIST_ZIPLIST  10
#define RDB_TYPE_SET_INTSET    11
#define RDB_TYPE_ZSET_ZIPLIST  12
#define RDB_TYPE_HASH_ZIPLIST  13
#define RDB_TYPE_LIST_QUICKLIST 14
#define RDB_TYPE_STREAM_LISTPACKS 15
#define RDB_TYPE_HASH_LISTPACK 16
#define RDB_TYPE_ZSET_LISTPACK 17
#define RDB_TYPE_LIST_QUICKLIST_2   18
#define RDB_TYPE_STREAM_LISTPACKS_2 19
#define RDB_TYPE_SET_LISTPACK  20
#define RDB_TYPE_STREAM_LISTPACKS_3 21
/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType(), and rdb_type_string[] */

/* Test if a type is an object type. */
#define rdbIsObjectType(t) (((t) >= 0 && (t) <= 7) || ((t) >= 9 && (t) <= 21))

/* Special RDB opcodes (saved/loaded with rdbSaveType/rdbLoadType). */
#define RDB_OPCODE_SLOT_INFO  244   /* Individual slot info, such as slot id and size (cluster mode only). */
#define RDB_OPCODE_FUNCTION2  245   /* function library data */
#define RDB_OPCODE_FUNCTION_PRE_GA   246   /* old function library data for 7.0 rc1 and rc2 */
#define RDB_OPCODE_MODULE_AUX 247   /* Module auxiliary data. */
#define RDB_OPCODE_IDLE       248   /* LRU idle time. */
#define RDB_OPCODE_FREQ       249   /* LFU frequency. */
#define RDB_OPCODE_AUX        250   /* RDB aux field. */
#define RDB_OPCODE_RESIZEDB   251   /* Hash table resize hint. */
#define RDB_OPCODE_EXPIRETIME_MS 252    /* Expire time in milliseconds. */
#define RDB_OPCODE_EXPIRETIME 253       /* Old expire time in seconds. */
#define RDB_OPCODE_SELECTDB   254   /* DB number of the following keys. */
#define RDB_OPCODE_EOF        255   /* End of the RDB file. */

/* Module serialized values sub opcodes */
#define RDB_MODULE_OPCODE_EOF   0   /* End of module value. */
#define RDB_MODULE_OPCODE_SINT  1   /* Signed integer. */
#define RDB_MODULE_OPCODE_UINT  2   /* Unsigned integer. */
#define RDB_MODULE_OPCODE_FLOAT 3   /* Float. */
#define RDB_MODULE_OPCODE_DOUBLE 4  /* Double. */
#define RDB_MODULE_OPCODE_STRING 5  /* String. */

/* rdbLoad...() functions flags. */
#define RDB_LOAD_NONE   0
#define RDB_LOAD_ENC    (1<<0)
#define RDB_LOAD_PLAIN  (1<<1)
#define RDB_LOAD_SDS    (1<<2)

/* flags on the purpose of rdb save or load */
#define RDBFLAGS_NONE 0                 /* No special RDB loading or saving. */
#define RDBFLAGS_AOF_PREAMBLE (1<<0)    /* Load/save the RDB as AOF preamble. */
#define RDBFLAGS_REPLICATION (1<<1)     /* Load/save for SYNC. */
#define RDBFLAGS_ALLOW_DUP (1<<2)       /* Allow duplicated keys when loading.*/
#define RDBFLAGS_FEED_REPL (1<<3)       /* Feed replication stream when loading.*/
#define RDBFLAGS_KEEP_CACHE (1<<4)      /* Don't reclaim cache after rdb file is generated */

/* When rdbLoadObject() returns NULL, the err flag is
 * set to hold the type of error that occurred */
#define RDB_LOAD_ERR_EMPTY_KEY  1   /* Error of empty key */
#define RDB_LOAD_ERR_OTHER      2   /* Any other errors */

ssize_t rdbWriteRaw(rio *rdb, void *p, size_t len);
int rdbSaveType(rio *rdb, unsigned char type);
int rdbLoadType(rio *rdb);
time_t rdbLoadTime(rio *rdb);
int rdbSaveLen(rio *rdb, uint64_t len);
ssize_t rdbSaveMillisecondTime(rio *rdb, long long t);
long long rdbLoadMillisecondTime(rio *rdb, int rdbver);
uint64_t rdbLoadLen(rio *rdb, int *isencoded);
int rdbLoadLenByRef(rio *rdb, int *isencoded, uint64_t *lenptr);
int rdbSaveObjectType(rio *rdb, robj *o);
int rdbLoadObjectType(rio *rdb);
int rdbLoad(char *filename, rdbSaveInfo *rsi, int rdbflags);
int rdbSaveBackground(int req, char *filename, rdbSaveInfo *rsi, int rdbflags);
int rdbSaveToSlavesSockets(int req, rdbSaveInfo *rsi);
void rdbRemoveTempFile(pid_t childpid, int from_signal);
int rdbSaveToFile(const char *filename);
int rdbSave(int req, char *filename, rdbSaveInfo *rsi, int rdbflags);
ssize_t rdbSaveObject(rio *rdb, robj *o, robj *key, int dbid);
size_t rdbSavedObjectLen(robj *o, robj *key, int dbid);
robj *rdbLoadObject(int rdbtype, rio *rdb, sds key, int dbid, int *error);
void backgroundSaveDoneHandler(int exitcode, int bysignal);
int rdbSaveKeyValuePair(rio *rdb, robj *key, robj *val, long long expiretime,int dbid);
ssize_t rdbSaveSingleModuleAux(rio *rdb, int when, moduleType *mt);
robj *rdbLoadCheckModuleValue(rio *rdb, char *modulename);
robj *rdbLoadStringObject(rio *rdb);
ssize_t rdbSaveStringObject(rio *rdb, robj *obj);
ssize_t rdbSaveRawString(rio *rdb, unsigned char *s, size_t len);
void *rdbGenericLoadStringObject(rio *rdb, int flags, size_t *lenptr);
int rdbSaveBinaryDoubleValue(rio *rdb, double val);
int rdbLoadBinaryDoubleValue(rio *rdb, double *val);
int rdbSaveBinaryFloatValue(rio *rdb, float val);
int rdbLoadBinaryFloatValue(rio *rdb, float *val);
int rdbLoadRio(rio *rdb, int rdbflags, rdbSaveInfo *rsi);
int rdbLoadRioWithLoadingCtx(rio *rdb, int rdbflags, rdbSaveInfo *rsi, rdbLoadingCtx *rdb_loading_ctx);
int rdbFunctionLoad(rio *rdb, int ver, functionsLibCtx* lib_ctx, int rdbflags, sds *err);
int rdbSaveRio(int req, rio *rdb, int *error, int rdbflags, rdbSaveInfo *rsi);
ssize_t rdbSaveFunctions(rio *rdb);
rdbSaveInfo *rdbPopulateSaveInfo(rdbSaveInfo *rsi);

#endif
