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shift first then xor with generator

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This commit is contained in:
Ahmet Inan 2018-09-24 10:54:26 +02:00
commit ca24063591
1 changed files with 8 additions and 9 deletions
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17
bose_chaudhuri_hocquenghem_encoder.hh
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@ -58,15 +58,14 @@ public:
for (int l = K/8+1; l < N/8; ++l)
code[l] = 0;
for (int i = 0; i < K; ++i) {
if (get_be_bit(code, i) != get_be_bit(code, K)) {
for (int j = 1; j < NP; ++j)
set_be_bit(code, K+j-1, get_be_bit(generator, j) != get_be_bit(code, K+j));
set_be_bit(code, N-1, get_be_bit(generator, NP));
} else {
code[K/8] = (~mask&code[K/8]) | (mask&((code[K/8]<<1)|(code[K/8+1]>>7)));
for (int l = K/8+1; l < (N-1)/8; ++l)
code[l] = (code[l]<<1) | (code[l+1]>>7);
code[(N-1)/8] <<= 1;
bool fb = get_be_bit(code, i) != get_be_bit(code, K);
code[K/8] = (~mask&code[K/8]) | (mask&((code[K/8]<<1)|(code[K/8+1]>>7)));
for (int l = K/8+1; l < (N-1)/8; ++l)
code[l] = (code[l]<<1) | (code[l+1]>>7);
code[(N-1)/8] <<= 1;
if (fb) {
for (int j = 0; j <= NP; ++j)
xor_be_bit(code, K+j, get_be_bit(generator, j+1));
}
}
}