50 lines
957 B
C
50 lines
957 B
C
#include "../util/masks.h"
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#include "bits_be.h"
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unsigned int bit_be_bitbuf;
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char *bit_be_filestart;
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int bit_be_inbytes;
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static unsigned int bit_be_subbitbuf;
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static int bit_be_bitcount;
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void
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bit_be_fillbuf ( /* Shift bit_be_bitbuf n bits left, read n bits */
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int n
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)
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{
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bit_be_bitbuf <<= n;
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while (n > bit_be_bitcount) {
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bit_be_bitbuf |= bit_be_subbitbuf << (n -= bit_be_bitcount);
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if(bit_be_inbytes == 0) {
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bit_be_subbitbuf = 0;
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} else {
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bit_be_subbitbuf = *bit_be_filestart++ & BYTEMASK;
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bit_be_inbytes--;
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}
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bit_be_bitcount = 8;
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}
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bit_be_bitbuf |= bit_be_subbitbuf >> (bit_be_bitcount -= n);
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bit_be_bitbuf &= WORDMASK;
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}
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unsigned int
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bit_be_getbits (int n)
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{
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unsigned int x;
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x = bit_be_bitbuf >> (BITBUFSIZ - n);
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bit_be_fillbuf(n);
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return x;
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}
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void
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bit_be_init_getbits (void)
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{
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bit_be_bitbuf = 0;
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bit_be_subbitbuf = 0;
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bit_be_bitcount = 0;
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bit_be_fillbuf(BITBUFSIZ);
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}
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