void myerror   (char *buf, char *s1, char *s2);
int  getbits   (int n, int p, int x);
int  ipow      (int x, int y);
void uc_fread  (unsigned char *ptr, int num,    FILE *fp);
int  suckchunk (unsigned char *buf, int bufsiz, FILE *fp);
void uc_fwrite (unsigned char *ptr, int num,    FILE *fp);
void spewrest  (FILE *IStream, FILE *OStream);
void debugimageinfo (imageinfo *iinfo);