sprog/uucode.c

#include <sprog.h>
#include <uucode.h>

/* aaaa aa|aa bbbb|bbbb cc|cc cccc */

int uuencode_line(const struct sprog_data *d, char *dst, int *offset, int *checksum) {
  char srcbuf[64];
  char *dstd;
  int b;
  int n;
  int i;
  
  if(*offset >= d->size)
    return 0;
  
  b = d->size - *offset;
  if(b>45) b = 45;

  for(i=0; i<b; i++) {
    srcbuf[i] = d->data[*offset + i];
    *checksum += (unsigned char) srcbuf[i];
  }
  
  for(i=0; i<3; i++)
    srcbuf[b+i] = 0;
  
  dst[0] = b;
  
  dstd = &dst[1];
  
  n = 0;
  for(i=0; i<b; i+=3) {
    dstd[0] = (srcbuf[i]>>2) & 0x3f;
    dstd[1] = (srcbuf[i]<<4 & 0x30) | (srcbuf[i+1]>>4 & 0x0f);
    dstd[2] = (srcbuf[i+1]<<2 &0x3c) | (srcbuf[i+2]>>6 & 0x03);
    dstd[3] = srcbuf[i+2] & 0x3f;
    dstd += 4;
    n += 4;
  }
  
  
  for(i=0; i<n+1; i++) {
    if(dst[i])
      dst[i] += ' ';
    else
      dst[i] = '`';
  }
  
  dstd[0] = 0;
  
  *offset += b;
  
  if(*offset >= d->size)
    return 2;
  
  return 1;
}
  
  
  
void uudecode_line(struct sprog_data *d, const char *src, int *checksum) {
  d = 0;
  src = 0;
  checksum = 0;
  return;
}