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extern ULONG mask_bits[], bitbuf;
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extern UCHAR *indata, bitcount;
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#define GETBITS(n) ((USHORT)(bitbuf >> (bitcount-(n))))
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#define DROPBITS(n) {bitbuf &= mask_bits[bitcount-=(n)]; while (bitcount<16) {bitbuf = (bitbuf << 8) | *indata++; bitcount += 8;}}
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void initbitbuf(UCHAR *);
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