Chunker内容定义组块实现
Chunker 是基于滚动 Rabin Hash 实现内容定义组块(CDC)。
CDC 算法是一种变长分块算法,它应用数据指纹(如Rabin指纹)将文件分割成长度大小不等的分块策略。与定长分块算法不同,它是基于文件内容进行数据块切分的,因此数据块大小是可变化的。
package chunker
import "github.com/restic/chunker"
对于以十六进制系数表示法对指定的多项式列表进行过滤,可以使用以下脚本:
# create x over F_2 = GF(2) x := Indeterminate(GF(2), "x"); # test if polynomial is irreducible, i.e. the number of factors is one IrredPoly := function (poly) return (Length(Factors(poly)) = 1); end;; # create a polynomial in x from the hexadecimal representation of the # coefficients Hex2Poly := function (s) return ValuePol(CoefficientsQadic(IntHexString(s), 2), x); end;; # list of candidates, in hex candidates := [ "3DA3358B4DC173" ]; # create real polynomials L := List(candidates, Hex2Poly); # filter and display the list of irreducible polynomials contained in L Display(Filtered(L, x -> (IrredPoly(x))));
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