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https://github.com/tym1116/BH3.git
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65 lines
4.0 KiB
C#
65 lines
4.0 KiB
C#
using System.IO;
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using System.Text;
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namespace MoleMole
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{
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internal class Crc32Utils
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{
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private static uint[] table = new uint[256]
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{
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0u, 4240017535u, 570562233u, 3736837830u, 1141124466u, 3099436301u, 1711684555u, 2596254644u, 2282248932u, 1957810843u,
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2852801629u, 1454621730u, 3423369110u, 817233897u, 3993919791u, 314042704u, 3412177807u, 936918000u, 3915621686u, 366619977u,
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2405801725u, 1943803522u, 2909243460u, 1373503547u, 1131014507u, 3218104596u, 1634467794u, 2647816109u, 124634137u, 4224994406u,
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628085408u, 3654703839u, 1303535961u, 2970347814u, 1873836000u, 2466906015u, 162941995u, 4111451220u, 733239954u, 3608007405u,
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3317316541u, 956543938u, 3887607044u, 453092731u, 2176718543u, 2097651376u, 2747007094u, 1594198025u, 2262029014u, 2053790377u,
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2765210735u, 1483230224u, 3268935588u, 1047427035u, 3772115229u, 476864866u, 249268274u, 4066508877u, 752459403u, 3495958260u,
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1256170816u, 3060149567u, 1759359993u, 2489596806u, 2607071922u, 1742555853u, 3110523915u, 1172266100u, 3747672000u, 601450431u,
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4251122041u, 31158534u, 325883990u, 4023717929u, 829329135u, 3453421200u, 1466479908u, 2882616667u, 1969922973u, 2312317922u,
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1342533949u, 2898065730u, 1913087876u, 2394877947u, 335633487u, 3904427056u, 906185462u, 3401237129u, 3624741849u, 615818150u,
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4195302752u, 112637215u, 2617837227u, 1622183636u, 3188396050u, 1119000685u, 3604390891u, 711928724u, 4107580754u, 141376813u,
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2463272601u, 1852507878u, 2966460448u, 1281953887u, 1591671055u, 2724688240u, 2094854070u, 2154129353u, 450548861u, 3865271298u,
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953729732u, 3294710459u, 498536548u, 3775830043u, 1068828381u, 3272380066u, 1504918806u, 2768942441u, 2075208623u, 2265490384u,
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2512341632u, 1762050815u, 3082640441u, 1258607686u, 3518719986u, 755167117u, 4089016651u, 251722036u, 3988292387u, 285281116u,
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3485111706u, 855842277u, 2847714897u, 1426400814u, 2344532200u, 1996959895u, 1706088903u, 2567524792u, 1202900862u, 3138078465u,
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565507253u, 3708648650u, 62317068u, 4279200371u, 651767980u, 3663771859u, 81470997u, 4167216746u, 1658658270u, 2657392033u,
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1088359271u, 3160834840u, 2932959816u, 1382605367u, 2362670321u, 1886057614u, 3939845946u, 376229701u, 3369554307u, 879679996u,
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2685067898u, 1555261957u, 2181625027u, 2125561020u, 3826175752u, 414664567u, 3322730929u, 984961486u, 671266974u, 3569037537u,
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167816743u, 4139329112u, 1812370924u, 2428444051u, 1308918613u, 2998733610u, 1802195445u, 2547177866u, 1231636300u, 3050360627u,
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795835527u, 3554079992u, 225274430u, 4057260609u, 3814918929u, 534414190u, 3244367272u, 1037604311u, 2808555107u, 1541320220u,
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2238001370u, 2044508325u, 1994146193u, 2321926638u, 1423857448u, 2825379671u, 853044451u, 3462522012u, 282753626u, 3965973029u,
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4275313525u, 40735498u, 3705015756u, 544179635u, 3134207495u, 1181335160u, 2563907774u, 1684777153u, 3183342110u, 1090812513u,
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2680153255u, 1661365464u, 4189708140u, 83908371u, 3686517205u, 654459306u, 901097722u, 3373015173u, 397917763u, 3943577148u,
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1907459464u, 2366115319u, 1404277553u, 2936675150u, 997073096u, 3352799415u, 426522225u, 3855990286u, 2137656762u, 2211677637u,
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1567103747u, 2714866556u, 3009837612u, 1340076627u, 2439277717u, 1843258602u, 4150417246u, 198958881u, 3579855335u, 702138776u,
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4027552583u, 213261112u, 3524101630u, 783551873u, 3020668469u, 1219638858u, 2517215372u, 1789927667u, 2013776291u, 2227061212u,
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1510334234u, 2797360997u, 1006888145u, 3233442990u, 503444072u, 3803740695u
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};
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private static uint seed = 4041331395u;
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public static uint crc32(MemoryStream stream)
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{
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return crc32(stream.GetBuffer(), (int)stream.Length);
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}
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public static uint crc32(uint seed, string str)
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{
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return crc32(Encoding.Default.GetBytes(str), str.Length);
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}
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public static uint crc32(byte[] buf, int buf_len)
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{
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if (buf.Length == 0 || buf_len == 0)
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{
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return 0u;
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}
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uint num = seed ^ 0xFFFFFFFFu;
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for (int i = 0; i < buf.Length && i < buf_len; i++)
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{
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num = (num >> 8) ^ table[(buf[i] ^ num) & 0xFF];
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}
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return num ^ 0xFFFFFFFFu;
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}
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}
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}
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