static int receivebits(int buf[], int num_of_bits) {

    int cnt, num; 
    unsigned int lastbits, lastbyte;
    unsigned char * cbuf;
    int mask = (1 << num_of_bits) -1;

    cbuf = ((unsigned char *)buf) + 3 * sizeof(*buf);
    cnt = buf[0];
    lastbits = (unsigned int) buf[1];
    lastbyte = (unsigned int) buf[2];
    
    num = 0;
    while (num_of_bits >= 8) {
    lastbyte = ( lastbyte << 8 ) | cbuf[cnt++];
    num |=  (lastbyte >> lastbits) << (num_of_bits - 8);
    num_of_bits -=8;
    }
    if (num_of_bits > 0) {
    if (lastbits < num_of_bits) {
        lastbits += 8;
        lastbyte = (lastbyte << 8) | cbuf[cnt++];
    }
    lastbits -= num_of_bits;
    num |= (lastbyte >> lastbits) & ((1 << num_of_bits) -1);
    }
    num &= mask;
    buf[0] = cnt;
    buf[1] = lastbits;
    buf[2] = lastbyte;
    return num; 
}

K>static int receivebits(int buf[], int num_of_bits) {

K>    int cnt, num; 
K>    unsigned int lastbits, lastbyte;
K>    unsigned char * cbuf;
K>    int mask = (1 << num_of_bits) -1;

K>    cbuf = ((unsigned char *)buf) + 3 * sizeof(*buf);
K>    cnt = buf[0];
K>    lastbits = (unsigned int) buf[1];
K>    lastbyte = (unsigned int) buf[2];
    
K>    num = 0;
K>    while (num_of_bits >= 8) {
K>    lastbyte = ( lastbyte << 8 ) | cbuf[cnt++];
K>    num |=  (lastbyte >> lastbits) << (num_of_bits - 8);
K>    num_of_bits -=8;
K>    }
K>    if (num_of_bits > 0) {
K>    if (lastbits < num_of_bits) {
K>        lastbits += 8;
K>        lastbyte = (lastbyte << 8) | cbuf[cnt++];
K>    }
K>    lastbits -= num_of_bits;
K>    num |= (lastbyte >> lastbits) & ((1 << num_of_bits) -1);
K>    }
K>    num &= mask;
K>    buf[0] = cnt;
K>    buf[1] = lastbits;
K>    buf[2] = lastbyte;
K>    return num; 
K>}
K>

struct {
  int cnt; // текущая позиция в buf
  int lastbits; // кол-во бит в аккумуляторе
  int lastbyte; // аккумулятор
  char buf[]; // поток данных
};