315 lines
5.1 KiB
Python
315 lines
5.1 KiB
Python
import array
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CRC_TABLE = (
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0x00000000,
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0xF26B8303,
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0xE13B70F7,
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0x1350F3F4,
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0xC79A971F,
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0x35F1141C,
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0x26A1E7E8,
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0xD4CA64EB,
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0x8AD958CF,
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0x78B2DBCC,
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0x6BE22838,
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0x9989AB3B,
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0x4D43CFD0,
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0xBF284CD3,
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0xAC78BF27,
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0x5E133C24,
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0x105EC76F,
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0xE235446C,
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0xF165B798,
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0x030E349B,
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0xD7C45070,
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0x25AFD373,
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0x36FF2087,
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0xC494A384,
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0x9A879FA0,
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0x68EC1CA3,
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0x7BBCEF57,
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0x89D76C54,
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0x5D1D08BF,
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0xAF768BBC,
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0xBC267848,
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0x4E4DFB4B,
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0x20BD8EDE,
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0xD2D60DDD,
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0xC186FE29,
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0x33ED7D2A,
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0xE72719C1,
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0x154C9AC2,
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0x061C6936,
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0xF477EA35,
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0xAA64D611,
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0x580F5512,
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0x4B5FA6E6,
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0xB93425E5,
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0x6DFE410E,
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0x9F95C20D,
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0x8CC531F9,
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0x7EAEB2FA,
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0x30E349B1,
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0xC288CAB2,
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0xD1D83946,
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0x23B3BA45,
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0xF779DEAE,
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0x05125DAD,
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0x1642AE59,
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0xE4292D5A,
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0xBA3A117E,
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0x4851927D,
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0x5B016189,
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0xA96AE28A,
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0x7DA08661,
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0x8FCB0562,
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0x9C9BF696,
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0x6EF07595,
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0x417B1DBC,
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0xB3109EBF,
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0xA0406D4B,
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0x522BEE48,
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0x86E18AA3,
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0x748A09A0,
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0x67DAFA54,
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0x95B17957,
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0xCBA24573,
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0x39C9C670,
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0x2A993584,
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0xD8F2B687,
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0x0C38D26C,
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0xFE53516F,
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0xED03A29B,
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0x1F682198,
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0x5125DAD3,
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0xA34E59D0,
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0xB01EAA24,
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0x42752927,
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0x96BF4DCC,
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0x64D4CECF,
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0x77843D3B,
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0x85EFBE38,
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0xDBFC821C,
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0x2997011F,
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0x3AC7F2EB,
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0xC8AC71E8,
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0x1C661503,
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0xEE0D9600,
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0xFD5D65F4,
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0x0F36E6F7,
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0x61C69362,
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0x93AD1061,
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0x80FDE395,
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0x72966096,
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0xA65C047D,
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0x5437877E,
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0x4767748A,
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0xB50CF789,
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0xEB1FCBAD,
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0x197448AE,
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0x0A24BB5A,
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0xF84F3859,
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0x2C855CB2,
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0xDEEEDFB1,
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0xCDBE2C45,
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0x3FD5AF46,
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0x7198540D,
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0x83F3D70E,
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0x90A324FA,
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0x62C8A7F9,
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0xB602C312,
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0x44694011,
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0x5739B3E5,
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0xA55230E6,
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0xFB410CC2,
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0x092A8FC1,
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0x1A7A7C35,
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0xE811FF36,
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0x3CDB9BDD,
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0xCEB018DE,
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0xDDE0EB2A,
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0x2F8B6829,
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0x82F63B78,
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0x709DB87B,
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0x63CD4B8F,
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0x91A6C88C,
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0x456CAC67,
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0xB7072F64,
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0xA457DC90,
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0x563C5F93,
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0x082F63B7,
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0xFA44E0B4,
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0xE9141340,
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0x1B7F9043,
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0xCFB5F4A8,
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0x3DDE77AB,
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0x2E8E845F,
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0xDCE5075C,
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0x92A8FC17,
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0x60C37F14,
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0x73938CE0,
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0x81F80FE3,
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0x55326B08,
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0xA759E80B,
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0xB4091BFF,
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0x466298FC,
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0x1871A4D8,
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0xEA1A27DB,
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0xF94AD42F,
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0x0B21572C,
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0xDFEB33C7,
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0x2D80B0C4,
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0x3ED04330,
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0xCCBBC033,
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0xA24BB5A6,
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0x502036A5,
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0x4370C551,
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0xB11B4652,
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0x65D122B9,
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0x97BAA1BA,
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0x84EA524E,
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0x7681D14D,
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0x2892ED69,
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0xDAF96E6A,
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0xC9A99D9E,
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0x3BC21E9D,
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0xEF087A76,
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0x1D63F975,
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0x0E330A81,
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0xFC588982,
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0xB21572C9,
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0x407EF1CA,
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0x532E023E,
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0xA145813D,
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0x758FE5D6,
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0x87E466D5,
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0x94B49521,
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0x66DF1622,
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0x38CC2A06,
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0xCAA7A905,
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0xD9F75AF1,
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0x2B9CD9F2,
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0xFF56BD19,
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0x0D3D3E1A,
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0x1E6DCDEE,
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0xEC064EED,
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0xC38D26C4,
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0x31E6A5C7,
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0x22B65633,
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0xD0DDD530,
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0x0417B1DB,
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0xF67C32D8,
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0xE52CC12C,
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0x1747422F,
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0x49547E0B,
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0xBB3FFD08,
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0xA86F0EFC,
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0x5A048DFF,
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0x8ECEE914,
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0x7CA56A17,
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0x6FF599E3,
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0x9D9E1AE0,
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0xD3D3E1AB,
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0x21B862A8,
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0x32E8915C,
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0xC083125F,
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0x144976B4,
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0xE622F5B7,
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0xF5720643,
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0x07198540,
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0x590AB964,
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0xAB613A67,
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0xB831C993,
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0x4A5A4A90,
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0x9E902E7B,
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0x6CFBAD78,
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0x7FAB5E8C,
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0x8DC0DD8F,
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0xE330A81A,
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0x115B2B19,
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0x020BD8ED,
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0xF0605BEE,
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0x24AA3F05,
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0xD6C1BC06,
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0xC5914FF2,
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0x37FACCF1,
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0x69E9F0D5,
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0x9B8273D6,
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0x88D28022,
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0x7AB90321,
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0xAE7367CA,
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0x5C18E4C9,
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0x4F48173D,
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0xBD23943E,
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0xF36E6F75,
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0x0105EC76,
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0x12551F82,
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0xE03E9C81,
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0x34F4F86A,
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0xC69F7B69,
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0xD5CF889D,
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0x27A40B9E,
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0x79B737BA,
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0x8BDCB4B9,
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0x988C474D,
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0x6AE7C44E,
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0xBE2DA0A5,
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0x4C4623A6,
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0x5F16D052,
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0xAD7D5351,
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)
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CRC_INIT = 0
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_MASK = 0xFFFFFFFF
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def crc_update(crc, data):
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"""Update CRC-32C checksum with data.
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Args:
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crc: 32-bit checksum to update as long.
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data: byte array, string or iterable over bytes.
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Returns:
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32-bit updated CRC-32C as long.
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"""
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if type(data) != array.array or data.itemsize != 1:
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buf = array.array("B", data)
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else:
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buf = data
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crc ^= _MASK
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for b in buf:
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table_index = (crc ^ b) & 0xFF
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crc = (CRC_TABLE[table_index] ^ (crc >> 8)) & _MASK
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return crc ^ _MASK
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def crc_finalize(crc):
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"""Finalize CRC-32C checksum.
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This function should be called as last step of crc calculation.
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Args:
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crc: 32-bit checksum as long.
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Returns:
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finalized 32-bit checksum as long
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"""
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return crc & _MASK
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def crc32c(data):
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"""Compute CRC-32C checksum of the data.
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Args:
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data: byte array, string or iterable over bytes.
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Returns:
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32-bit CRC-32C checksum of data as long.
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"""
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return crc_finalize(crc_update(CRC_INIT, data))
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