(KeepIt)简单愚蠢的数据库
KISSDB是一个最简单的key/value存储，使用纯C开发，只适用标准字符串和FILEIO函数。
特性：
Tiny,compilesto~4konanx86_64LinuxsystemSmallmemoryfootprint(onlycacheshashtables)Veryspace-efficient(ondisk)ifsmallhashtablesareusedMakesadecentefforttoberobustonpowerlossPrettyrespectablyfast,especiallygivenitssimplicity64-bit,filesizelimitis2^64bytesPortstoanythingwithaCcompilerandstdlib/stdioPublicdomain限制：
Fixed-sizekeysandvalues,mustrecreateandcopytochangeanyinitsizeparameterAdd/updateonly,nodeleteIterationissupportedbutkeyorderisundefinedNosearchforsubsetsofkeys/valuesNoindexesNotransactionsNospecialrecoveryfeaturesifadatabasegetscorruptedNobuilt-inthread-safety(guarditwithamutexinMTcode)Nobuilt-incachingofdata(onlyhashtablesarecachedforlookupspeed)Noendian-awareness(currently),sobig-endianDBswon'treadonlittle-endianmachines
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