266     file gz;  in gzscan()  local
269     gz.name = name;  in gzscan()
270     gz.fd = open(name, O_RDWR, 0);  in gzscan()
271     if (gz.fd == -1) bye("cannot open ", name);  in gzscan()
272     gz.buf = malloc(CHUNK);  in gzscan()
273     if (gz.buf == NULL) bye("out of memory", "");  in gzscan()
274     gz.size = LGCHUNK;  in gzscan()
275     gz.left = 0;  in gzscan()
278     gzheader(&gz);  in gzscan()
291     lastoff = lseek(gz.fd, 0L, SEEK_CUR) - gz.left;  in gzscan()
293     strm->avail_in = gz.left;  in gzscan()
294     strm->next_in = gz.next;  in gzscan()
300             readmore(&gz);  in gzscan()
301             strm->avail_in = gz.left;  in gzscan()
302             strm->next_in = gz.next;  in gzscan()
331                 lastoff = lseek(gz.fd, 0L, SEEK_CUR) - strm->avail_in;  in gzscan()
336     gz.left = strm->avail_in;  in gzscan()
337     gz.next = strm->next_in;  in gzscan()
340     end = lseek(gz.fd, 0L, SEEK_CUR) - gz.left;  in gzscan()
343     if (crc != read4(&gz))  in gzscan()
346     if ((tot & 0xffffffffUL) != read4(&gz))  in gzscan()
350     if (gz.left || readin(&gz))  in gzscan()
355     lseek(gz.fd, lastoff - (lastbit != 0), SEEK_SET);  in gzscan()
356     if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name);  in gzscan()
357     *gz.buf = (unsigned char)(*gz.buf ^ (1 << ((8 - lastbit) & 7)));  in gzscan()
358     lseek(gz.fd, -1L, SEEK_CUR);  in gzscan()
359     if (write(gz.fd, gz.buf, 1) != 1) bye("writing after seek to ", name);  in gzscan()
374         lseek(gz.fd, --end, SEEK_SET);  in gzscan()
375         if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name);  in gzscan()
376         deflatePrime(strm, 8 - left, *gz.buf);  in gzscan()
378     lseek(gz.fd, end, SEEK_SET);  in gzscan()
382     free(gz.buf);  in gzscan()
383     return gz.fd;  in gzscan()