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--CRC32.lua by RamiLego4Game | ||
--[[ | ||
Made for use in LuaJIT (Requires the bitop library). | ||
local CRC32 = require("CRC32") | ||
local fileCRC = CRC32(DataString) | ||
References: | ||
https://en.wikipedia.org/wiki/Cyclic_redundancy_check | ||
http://www.ipgp.fr/~tuchais/earthworm/v6.3/src/data_sources/naqs2ew/crc32.c | ||
]] | ||
|
||
--[[ | ||
MIT License | ||
Copyright (c) 2018 Rami Sabbagh | ||
Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. | ||
]] | ||
|
||
local bit = require("bit") | ||
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local bxor, band, rshift = bit.bxor, bit.band, bit.rshift | ||
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local strByte = string.byte | ||
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local crctable = { | ||
0x00000000, | ||
0x77073096, | ||
0xEE0E612C, | ||
0x990951BA, | ||
0x076DC419, | ||
0x706AF48F, | ||
0xE963A535, | ||
0x9E6495A3, | ||
0x0EDB8832, | ||
0x79DCB8A4, | ||
0xE0D5E91E, | ||
0x97D2D988, | ||
0x09B64C2B, | ||
0x7EB17CBD, | ||
0xE7B82D07, | ||
0x90BF1D91, | ||
0x1DB71064, | ||
0x6AB020F2, | ||
0xF3B97148, | ||
0x84BE41DE, | ||
0x1ADAD47D, | ||
0x6DDDE4EB, | ||
0xF4D4B551, | ||
0x83D385C7, | ||
0x136C9856, | ||
0x646BA8C0, | ||
0xFD62F97A, | ||
0x8A65C9EC, | ||
0x14015C4F, | ||
0x63066CD9, | ||
0xFA0F3D63, | ||
0x8D080DF5, | ||
0x3B6E20C8, | ||
0x4C69105E, | ||
0xD56041E4, | ||
0xA2677172, | ||
0x3C03E4D1, | ||
0x4B04D447, | ||
0xD20D85FD, | ||
0xA50AB56B, | ||
0x35B5A8FA, | ||
0x42B2986C, | ||
0xDBBBC9D6, | ||
0xACBCF940, | ||
0x32D86CE3, | ||
0x45DF5C75, | ||
0xDCD60DCF, | ||
0xABD13D59, | ||
0x26D930AC, | ||
0x51DE003A, | ||
0xC8D75180, | ||
0xBFD06116, | ||
0x21B4F4B5, | ||
0x56B3C423, | ||
0xCFBA9599, | ||
0xB8BDA50F, | ||
0x2802B89E, | ||
0x5F058808, | ||
0xC60CD9B2, | ||
0xB10BE924, | ||
0x2F6F7C87, | ||
0x58684C11, | ||
0xC1611DAB, | ||
0xB6662D3D, | ||
0x76DC4190, | ||
0x01DB7106, | ||
0x98D220BC, | ||
0xEFD5102A, | ||
0x71B18589, | ||
0x06B6B51F, | ||
0x9FBFE4A5, | ||
0xE8B8D433, | ||
0x7807C9A2, | ||
0x0F00F934, | ||
0x9609A88E, | ||
0xE10E9818, | ||
0x7F6A0DBB, | ||
0x086D3D2D, | ||
0x91646C97, | ||
0xE6635C01, | ||
0x6B6B51F4, | ||
0x1C6C6162, | ||
0x856530D8, | ||
0xF262004E, | ||
0x6C0695ED, | ||
0x1B01A57B, | ||
0x8208F4C1, | ||
0xF50FC457, | ||
0x65B0D9C6, | ||
0x12B7E950, | ||
0x8BBEB8EA, | ||
0xFCB9887C, | ||
0x62DD1DDF, | ||
0x15DA2D49, | ||
0x8CD37CF3, | ||
0xFBD44C65, | ||
0x4DB26158, | ||
0x3AB551CE, | ||
0xA3BC0074, | ||
0xD4BB30E2, | ||
0x4ADFA541, | ||
0x3DD895D7, | ||
0xA4D1C46D, | ||
0xD3D6F4FB, | ||
0x4369E96A, | ||
0x346ED9FC, | ||
0xAD678846, | ||
0xDA60B8D0, | ||
0x44042D73, | ||
0x33031DE5, | ||
0xAA0A4C5F, | ||
0xDD0D7CC9, | ||
0x5005713C, | ||
0x270241AA, | ||
0xBE0B1010, | ||
0xC90C2086, | ||
0x5768B525, | ||
0x206F85B3, | ||
0xB966D409, | ||
0xCE61E49F, | ||
0x5EDEF90E, | ||
0x29D9C998, | ||
0xB0D09822, | ||
0xC7D7A8B4, | ||
0x59B33D17, | ||
0x2EB40D81, | ||
0xB7BD5C3B, | ||
0xC0BA6CAD, | ||
0xEDB88320, | ||
0x9ABFB3B6, | ||
0x03B6E20C, | ||
0x74B1D29A, | ||
0xEAD54739, | ||
0x9DD277AF, | ||
0x04DB2615, | ||
0x73DC1683, | ||
0xE3630B12, | ||
0x94643B84, | ||
0x0D6D6A3E, | ||
0x7A6A5AA8, | ||
0xE40ECF0B, | ||
0x9309FF9D, | ||
0x0A00AE27, | ||
0x7D079EB1, | ||
0xF00F9344, | ||
0x8708A3D2, | ||
0x1E01F268, | ||
0x6906C2FE, | ||
0xF762575D, | ||
0x806567CB, | ||
0x196C3671, | ||
0x6E6B06E7, | ||
0xFED41B76, | ||
0x89D32BE0, | ||
0x10DA7A5A, | ||
0x67DD4ACC, | ||
0xF9B9DF6F, | ||
0x8EBEEFF9, | ||
0x17B7BE43, | ||
0x60B08ED5, | ||
0xD6D6A3E8, | ||
0xA1D1937E, | ||
0x38D8C2C4, | ||
0x4FDFF252, | ||
0xD1BB67F1, | ||
0xA6BC5767, | ||
0x3FB506DD, | ||
0x48B2364B, | ||
0xD80D2BDA, | ||
0xAF0A1B4C, | ||
0x36034AF6, | ||
0x41047A60, | ||
0xDF60EFC3, | ||
0xA867DF55, | ||
0x316E8EEF, | ||
0x4669BE79, | ||
0xCB61B38C, | ||
0xBC66831A, | ||
0x256FD2A0, | ||
0x5268E236, | ||
0xCC0C7795, | ||
0xBB0B4703, | ||
0x220216B9, | ||
0x5505262F, | ||
0xC5BA3BBE, | ||
0xB2BD0B28, | ||
0x2BB45A92, | ||
0x5CB36A04, | ||
0xC2D7FFA7, | ||
0xB5D0CF31, | ||
0x2CD99E8B, | ||
0x5BDEAE1D, | ||
0x9B64C2B0, | ||
0xEC63F226, | ||
0x756AA39C, | ||
0x026D930A, | ||
0x9C0906A9, | ||
0xEB0E363F, | ||
0x72076785, | ||
0x05005713, | ||
0x95BF4A82, | ||
0xE2B87A14, | ||
0x7BB12BAE, | ||
0x0CB61B38, | ||
0x92D28E9B, | ||
0xE5D5BE0D, | ||
0x7CDCEFB7, | ||
0x0BDBDF21, | ||
0x86D3D2D4, | ||
0xF1D4E242, | ||
0x68DDB3F8, | ||
0x1FDA836E, | ||
0x81BE16CD, | ||
0xF6B9265B, | ||
0x6FB077E1, | ||
0x18B74777, | ||
0x88085AE6, | ||
0xFF0F6A70, | ||
0x66063BCA, | ||
0x11010B5C, | ||
0x8F659EFF, | ||
0xF862AE69, | ||
0x616BFFD3, | ||
0x166CCF45, | ||
0xA00AE278, | ||
0xD70DD2EE, | ||
0x4E048354, | ||
0x3903B3C2, | ||
0xA7672661, | ||
0xD06016F7, | ||
0x4969474D, | ||
0x3E6E77DB, | ||
0xAED16A4A, | ||
0xD9D65ADC, | ||
0x40DF0B66, | ||
0x37D83BF0, | ||
0xA9BCAE53, | ||
0xDEBB9EC5, | ||
0x47B2CF7F, | ||
0x30B5FFE9, | ||
0xBDBDF21C, | ||
0xCABAC28A, | ||
0x53B39330, | ||
0x24B4A3A6, | ||
0xBAD03605, | ||
0xCDD70693, | ||
0x54DE5729, | ||
0x23D967BF, | ||
0xB3667A2E, | ||
0xC4614AB8, | ||
0x5D681B02, | ||
0x2A6F2B94, | ||
0xB40BBE37, | ||
0xC30C8EA1, | ||
0x5A05DF1B, | ||
0x2D02EF8D, | ||
} | ||
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return function(data) | ||
local crc32 = 0xFFFFFFFF | ||
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for char in string.gmatch(data, ".") do | ||
local byte = strByte(char) | ||
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local nLookupIndex = band(bxor(crc32, byte), 0xFF) + 1 | ||
crc32 = bxor(rshift(crc32, 8), crctable[nLookupIndex]) | ||
end | ||
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crc32 = bxor(crc32, 0xFFFFFFFF) | ||
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return crc32 | ||
end |
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