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38 lines
726 B
C
38 lines
726 B
C
#include "params.h"
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#include "small.h"
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/* XXX: these functions rely on p mod 4 = 1 */
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/* all coefficients in -1, 0, 1 */
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void small_encode(unsigned char *c,const small *f)
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{
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small c0;
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int i;
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for (i = 0;i < p/4;++i) {
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c0 = *f++ + 1;
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c0 += (*f++ + 1) << 2;
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c0 += (*f++ + 1) << 4;
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c0 += (*f++ + 1) << 6;
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*c++ = c0;
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}
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c0 = *f++ + 1;
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*c++ = c0;
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}
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void small_decode(small *f,const unsigned char *c)
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{
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unsigned char c0;
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int i;
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for (i = 0;i < p/4;++i) {
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c0 = *c++;
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*f++ = ((small) (c0 & 3)) - 1; c0 >>= 2;
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*f++ = ((small) (c0 & 3)) - 1; c0 >>= 2;
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*f++ = ((small) (c0 & 3)) - 1; c0 >>= 2;
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*f++ = ((small) (c0 & 3)) - 1;
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}
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c0 = *c++;
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*f++ = ((small) (c0 & 3)) - 1;
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}
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