1 #ifndef __REDIS_RDB_H 2 #define __REDIS_RDB_H 3 4 #include <stdio.h> 5 #include "rio.h" 6 7 /* TBD: include only necessary headers. */ 8 #include "redis.h" 9 10 /* Defines related to the dump file format. To store 32 bits lengths for short 11 * keys requires a lot of space, so we check the most significant 2 bits of 12 * the first byte to interpreter the length: 13 * 14 * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte 15 * 01|000000 00000000 => 01, the len is 14 byes, 6 bits + 8 bits of next byte 16 * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow 17 * 11|000000 this means: specially encoded object will follow. The six bits 18 * number specify the kind of object that follows. 19 * See the REDIS_RDB_ENC_* defines. 20 * 21 * Lenghts up to 63 are stored using a single byte, most DB keys, and may 22 * values, will fit inside. */ 23 #define REDIS_RDB_6BITLEN 0 24 #define REDIS_RDB_14BITLEN 1 25 #define REDIS_RDB_32BITLEN 2 26 #define REDIS_RDB_ENCVAL 3 27 #define REDIS_RDB_LENERR UINT_MAX 28 29 /* When a length of a string object stored on disk has the first two bits 30 * set, the remaining two bits specify a special encoding for the object 31 * accordingly to the following defines: */ 32 #define REDIS_RDB_ENC_INT8 0 /* 8 bit signed integer */ 33 #define REDIS_RDB_ENC_INT16 1 /* 16 bit signed integer */ 34 #define REDIS_RDB_ENC_INT32 2 /* 32 bit signed integer */ 35 #define REDIS_RDB_ENC_LZF 3 /* string compressed with FASTLZ */ 36 37 /* Dup object types to RDB object types. Only reason is readability (are we 38 * dealing with RDB types or with in-memory object types?). */ 39 #define REDIS_RDB_TYPE_STRING 0 40 #define REDIS_RDB_TYPE_LIST 1 41 #define REDIS_RDB_TYPE_SET 2 42 #define REDIS_RDB_TYPE_ZSET 3 43 #define REDIS_RDB_TYPE_HASH 4 44 45 /* Object types for encoded objects. */ 46 #define REDIS_RDB_TYPE_HASH_ZIPMAP 9 47 #define REDIS_RDB_TYPE_LIST_ZIPLIST 10 48 #define REDIS_RDB_TYPE_SET_INTSET 11 49 #define REDIS_RDB_TYPE_ZSET_ZIPLIST 12 50 51 /* Test if a type is an object type. */ 52 #define rdbIsObjectType(t) ((t >= 0 && t <= 4) || (t >= 9 && t <= 12)) 53 54 /* Special RDB opcodes (saved/loaded with rdbSaveType/rdbLoadType). */ 55 #define REDIS_RDB_OPCODE_EXPIRETIME_MS 252 56 #define REDIS_RDB_OPCODE_EXPIRETIME 253 57 #define REDIS_RDB_OPCODE_SELECTDB 254 58 #define REDIS_RDB_OPCODE_EOF 255 59 60 /* Test if a type is an opcode. */ 61 #define rdbIsOpcode(t) (t >= 253 && t <= 255) 62 63 int rdbSaveType(rio *rdb, unsigned char type); 64 int rdbLoadType(rio *rdb); 65 int rdbSaveTime(rio *rdb, time_t t); 66 time_t rdbLoadTime(rio *rdb); 67 int rdbSaveLen(rio *rdb, uint32_t len); 68 uint32_t rdbLoadLen(rio *rdb, int *isencoded); 69 int rdbSaveObjectType(rio *rdb, robj *o); 70 int rdbLoadObjectType(rio *rdb); 71 int rdbLoad(char *filename); 72 int rdbSaveBackground(char *filename); 73 void rdbRemoveTempFile(pid_t childpid); 74 int rdbSave(char *filename); 75 int rdbSaveObject(rio *rdb, robj *o); 76 off_t rdbSavedObjectLen(robj *o); 77 off_t rdbSavedObjectPages(robj *o); 78 robj *rdbLoadObject(int type, rio *rdb); 79 void backgroundSaveDoneHandler(int exitcode, int bysignal); 80 int rdbSaveKeyValuePair(rio *rdb, robj *key, robj *val, long long expiretime, long long now); 81 robj *rdbLoadStringObject(rio *rdb); 82 83 #endif 84