81     unsigned left;          /* bytes remaining at next */  member
113     in->left = 0;  in bopen()
127     if (in->left != 0)  in bload()
131         len = (long)read(in->fd, in->buf + in->left, CHUNK - in->left);  in bload()
134         in->left += (unsigned)len;  in bload()
135     } while (len != 0 && in->left < CHUNK);  in bload()
140 #define bget(in) (in->left ? 0 : bload(in), \
141                   in->left ? (in->left--, *(in->next)++) : \
164     if (skip <= in->left) {  in bskip()
165         in->left -= skip;  in bskip()
171     skip -= in->left;  in bskip()
172     in->left = 0;  in bskip()
176         unsigned left;  in bskip()  local
178         left = skip & (CHUNK - 1);  in bskip()
179         if (left == 0) {  in bskip()
189         lseek(in->fd, skip - left, SEEK_CUR);  in bskip()
190         skip = left;  in bskip()
195     if (skip > in->left)  in bskip()
197     in->left -= skip;  in bskip()
256     if (in->left == 0)  in zpull()
258     if (in->left == 0)  in zpull()
260     strm->avail_in = in->left;  in zpull()
322             in->left = 0;  in gzcopy()
363                     in->left = 0;  in gzcopy()
374     in->left = strm.avail_in;  in gzcopy()