xeye_ atsu / Mbed 2 deprecated RiceGolombDPCM_Player

For BU9480F D-A Conv.

Dependencies:   mbed

_bitio.cpp@0:805cffac956b, 2010-08-26 (annotated)

Committer:
lynxeyed_atsu
Date:
Thu Aug 26 12:48:50 2010 +0000
Revision:
0:805cffac956b
Child:
1:02bfb013660c

        

        
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#include "mbed.h"





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#include "string"





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#include "_bitio.h"





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/*





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#define TRUE     1





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#define FALSE    0





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*/





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#define rightbits(n, x) ((x) & ((1U << (n)) - 1U))  





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/*





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typedef unsigned int  Uint;





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typedef unsigned char Uchar;





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*/





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FILE *infp, *outfp;





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int  getcount, putcount;





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Uint bitbuf;





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void init_bit_o(void)





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{





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    putcount = 8; bitbuf = 0;





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}





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void init_bit_i(void)





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{





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    getcount = 0; bitbuf = 0;





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}





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Uint getbit(void)





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{





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    int flag;





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    if (--getcount >= 0)  return (bitbuf >> getcount) & 1U;





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    getcount = 7; 





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    if((flag = fgetc(infp))==EOF)return OVERRUN;





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    else bitbuf = flag;





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    return (bitbuf >> 7) & 1U;





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}





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Uint getbits(int n)





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{





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    Uint x = 0;





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    if (n < 1 || 25 < n)  return 0;





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    while (n > getcount) {





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        n -= getcount;





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        x |= rightbits(getcount, bitbuf) << n;





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        bitbuf = fgetc(infp); getcount = 8;





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    }





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    getcount -= n;





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    return x | rightbits(n, bitbuf >> getcount);





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}





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void putbit(Uint bit)





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{





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    putcount--;





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    if (bit != 0)  bitbuf |= (1 << putcount);





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    if (putcount == 0) {





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        if (fputc(bitbuf, outfp) == EOF)  error("can't write\r\n");





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        bitbuf = 0; putcount = 8;





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    }





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}





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void putbits(int n, Uint x)





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{





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    if (n < 1 || 25 < n)  return;





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    while (n >= putcount) {





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        n -= putcount;





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        bitbuf |= rightbits(putcount, x >> n);





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        if (fputc(bitbuf, outfp) == EOF)  error("cant write\r\n");





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        bitbuf = 0U; putcount = 8;





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    }





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    putcount -= n;





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    bitbuf |= rightbits(n, x) << putcount;





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}