File content as of revision 0:805cffac956b:

#include "mbed.h"
#include "string"
#include "_bitio.h"


/*
#define TRUE     1
#define FALSE    0
*/
#define rightbits(n, x) ((x) & ((1U << (n)) - 1U))  
/*
typedef unsigned int  Uint;
typedef unsigned char Uchar;
*/
FILE *infp, *outfp;
int  getcount, putcount;
Uint bitbuf;

void init_bit_o(void)
{
    putcount = 8; bitbuf = 0;
}

void init_bit_i(void)
{
    getcount = 0; bitbuf = 0;
}


Uint getbit(void)
{
    int flag;
    if (--getcount >= 0)  return (bitbuf >> getcount) & 1U;
    getcount = 7; 
    if((flag = fgetc(infp))==EOF)return OVERRUN;
    else bitbuf = flag;
    return (bitbuf >> 7) & 1U;
}

Uint getbits(int n)
{
    Uint x = 0;
    if (n < 1 || 25 < n)  return 0;
    while (n > getcount) {
        n -= getcount;
        x |= rightbits(getcount, bitbuf) << n;
        bitbuf = fgetc(infp); getcount = 8;
    }
    getcount -= n;
    return x | rightbits(n, bitbuf >> getcount);
}


void putbit(Uint bit)
{
    putcount--;
    if (bit != 0)  bitbuf |= (1 << putcount);
    if (putcount == 0) {
        if (fputc(bitbuf, outfp) == EOF)  error("can't write\r\n");
        bitbuf = 0; putcount = 8;
    }
}


void putbits(int n, Uint x)
{
    if (n < 1 || 25 < n)  return;
    while (n >= putcount) {
        n -= putcount;
        bitbuf |= rightbits(putcount, x >> n);
        if (fputc(bitbuf, outfp) == EOF)  error("cant write\r\n");
        bitbuf = 0U; putcount = 8;
    }
    putcount -= n;
    bitbuf |= rightbits(n, x) << putcount;
}