mirror of
https://github.com/claunia/cuetools.net.git
synced 2025-12-16 18:14:25 +00:00
84 lines
3.9 KiB
C#
84 lines
3.9 KiB
C#
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<EFBFBD><EFBFBD>u s i n g S y s t e m ;
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u s i n g S y s t e m . C o l l e c t i o n s . G e n e r i c ;
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u s i n g S y s t e m . T e x t ;
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n a m e s p a c e C U E T o o l s . R i p p e r . S C S I
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{
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/ * *
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* <EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0: R S <EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0
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*
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* @ a u t h o r M a s a y u k i M i y a z a k i
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* h t t p : / / s o u r c e f o r g e . j p / p r o j e c t s / r e e d s o l o m o n /
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* /
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p u b l i c c l a s s R s E n c o d e
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{
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p r i v a t e s t a t i c G a l o i s g a l o i s = G a l o i s . i n s t a n c e ;
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p r i v a t e i n t n p a r ;
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p r i v a t e i n t [ ] e n c o d e G x ;
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/ * *
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* ubY<EFBFBD>_M<EFBFBD>Rn0\Ob
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* G ( x ) = <EFBFBD>[ k = 0 , n - 1 ] ( x + <EFBFBD>^ k )
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* e n c o d e G x n0<EFBFBD>mH0W[h0!kpen0&Ns0L0<EFBFBD>j0n0k0<EFBFBD>la
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* e n c o d e G x [ 0 ] = x ^ ( n p a r - 1 ) n0<EFBFBD>
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* e n c o d e G x [ 1 ] = x ^ ( n p a r - 2 ) n0<EFBFBD>
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* . . .
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* e n c o d e G x [ n p a r - 1 ] = x ^ 0 n0<EFBFBD>
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* /
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p u b l i c R s E n c o d e ( i n t n p a r )
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{
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t h i s . n p a r = n p a r ;
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e n c o d e G x = n e w i n t [ n p a r ] ;
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e n c o d e G x [ n p a r - 1 ] = 1 ;
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f o r ( i n t k o u = 0 ; k o u < n p a r ; k o u + + )
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{
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i n t e x = g a l o i s . t o E x p ( k o u ) ; / / e x = <EFBFBD>^ k o u
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/ / ( x + <EFBFBD>^ k o u ) <EFBFBD>0<EFBFBD>c<EFBFBD>0
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f o r ( i n t i = 0 ; i < n p a r - 1 ; i + + )
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{
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/ / <EFBFBD>s(Wn0<EFBFBD> * <EFBFBD>^ k o u + Nd0 Nn0!kpen0<EFBFBD>
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e n c o d e G x [ i ] = g a l o i s . m u l ( e n c o d e G x [ i ] , e x ) ^ e n c o d e G x [ i + 1 ] ;
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}
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e n c o d e G x [ n p a r - 1 ] = g a l o i s . m u l ( e n c o d e G x [ n p a r - 1 ] , e x ) ; / / g NMO<EFBFBD>n0<EFBFBD><EFBFBD>{
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}
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}
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/ * *
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* R S <EFBFBD>0<EFBFBD>0<EFBFBD>0n0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0
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*
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* @ p a r a m d a t a i n t [ ]
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* eQ<EFBFBD>R<EFBFBD>0<EFBFBD>0<EFBFBD>0M<EFBFBD>R
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* @ p a r a m l e n g t h i n t
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* eQ<EFBFBD>R<EFBFBD>0<EFBFBD>0<EFBFBD>0w<EFBFBD>
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* @ p a r a m p a r i t y i n t [ ]
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* <EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<h
}(uM<EFBFBD>R
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* @ p a r a m p a r i t y S t a r t P o s i n t
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* <EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<h
}(uI n d e x
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* @ r e t u r n b o o l
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* /
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p u b l i c v o i d e n c o d e ( b y t e [ ] d a t a , i n t d a t a p o s , i n t l e n g t h , b y t e [ ] p a r i t y , i n t p a r i t y S t a r t P o s )
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{
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i f ( l e n g t h < 0 | | l e n g t h + n p a r > 2 5 5 )
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t h r o w n e w E x c e p t i o n ( " R s E n c o d e : w r o n g l e n g t h " ) ;
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/ *
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* <EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<h
}(uM<EFBFBD>R
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* w r [ 0 ] g
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NMO
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* w r [ n p a r - 1 ] g NMO j0n0k0<EFBFBD>la
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* S0<EFBFBD>0g0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD>0<EFBFBD><EFBFBD>k0&Ny0K0H0j0O0f0<EFBFBD>0D0n0g00a r r a y c o p y L0OH0<EFBFBD>0
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* /
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b y t e [ ] w r = n e w b y t e [ n p a r ] ;
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f o r ( i n t i d x = d a t a p o s ; i d x < d a t a p o s + l e n g t h ; i d x + + )
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{
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i n t i b = w r [ 0 ] ^ d a t a [ i d x ] ;
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f o r ( i n t i = 0 ; i < n p a r - 1 ; i + + )
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w r [ i ] = ( b y t e ) ( w r [ i + 1 ] ^ g a l o i s . m u l ( i b , e n c o d e G x [ i ] ) ) ;
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w r [ n p a r - 1 ] = ( b y t e ) g a l o i s . m u l ( i b , e n c o d e G x [ n p a r - 1 ] ) ;
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}
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i f ( p a r i t y ! = n u l l )
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A r r a y . C o p y ( w r , 0 , p a r i t y , p a r i t y S t a r t P o s , n p a r ) ;
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}
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}
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}
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