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+/*
+ * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#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 8
+
+/* 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 byes, 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 */
+
+/* Dup object types to RDB object types. Only reason is readability (are we
+ * dealing with RDB types or with in-memory object types?). */
+#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 6
+/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType() BELOW */
+
+/* Object types for encoded objects. */
+#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
+/* NOTE: WHEN ADDING NEW RDB TYPE, UPDATE rdbIsObjectType() BELOW */
+
+/* Test if a type is an object type. */
+#define rdbIsObjectType(t) ((t >= 0 && t <= 6) || (t >= 9 && t <= 14))
+
+/* Special RDB opcodes (saved/loaded with rdbSaveType/rdbLoadType). */
+#define RDB_OPCODE_AUX        250
+#define RDB_OPCODE_RESIZEDB   251
+#define RDB_OPCODE_EXPIRETIME_MS 252
+#define RDB_OPCODE_EXPIRETIME 253
+#define RDB_OPCODE_SELECTDB   254
+#define RDB_OPCODE_EOF        255
+
+/* 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)
+
+#define RDB_SAVE_NONE 0
+#define RDB_SAVE_AOF_PREAMBLE (1<<0)
+
+int rdbSaveType(rio *rdb, unsigned char type);
+int rdbLoadType(rio *rdb);
+int rdbSaveTime(rio *rdb, time_t t);
+time_t rdbLoadTime(rio *rdb);
+int rdbSaveLen(rio *rdb, uint64_t len);
+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 rdbSaveBackground(char *filename, rdbSaveInfo *rsi);
+int rdbSaveToSlavesSockets(rdbSaveInfo *rsi);
+void rdbRemoveTempFile(pid_t childpid);
+int rdbSave(char *filename, rdbSaveInfo *rsi);
+ssize_t rdbSaveObject(rio *rdb, robj *o);
+size_t rdbSavedObjectLen(robj *o);
+robj *rdbLoadObject(int type, rio *rdb);
+void backgroundSaveDoneHandler(int exitcode, int bysignal);
+int rdbSaveKeyValuePair(rio *rdb, robj *key, robj *val, long long expiretime, long long now);
+robj *rdbLoadStringObject(rio *rdb);
+int 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, rdbSaveInfo *rsi);
+
+#endif