gcc/zlib/zlib.h

86     z_const Bytef *next_in;     /* next input byte */
87     uInt     avail_in;  /* number of bytes available at next_in */
132      The application must update next_in and avail_in when avail_in has dropped
256   - Compress more input starting at next_in and update next_in and avail_in
258     enough room in the output buffer), next_in and avail_in are updated and
346   if next_in or next_out was Z_NULL), Z_BUF_ERROR if no progress is possible
371    next_in, avail_in, zalloc, zfree and opaque must be initialized before by
372    the caller.  If next_in is not Z_NULL and avail_in is large enough (the
385    will be done by inflate().  (So next_in and avail_in may be modified, but
402   - Decompress more input starting at next_in and update next_in and avail_in
404     enough room in the output buffer), next_in is updated and processing will
432   number of unused bits in the last byte taken from strm->next_in, plus 64 if
498   next_in or next_out was Z_NULL), Z_MEM_ERROR if there was not enough memory,
535    fields next_in, zalloc, zfree and opaque must be initialized before by the
774    fields next_in, avail_in, zalloc, zfree and opaque must be initialized
813    will be done by inflate().  (So next_in and avail_in may be modified, but
906    from next_in.  This function should only be used with raw inflate, and
1056    setting strm->next_in and strm->avail_in.  If that input is exhausted, then
1057    in() will be called.  Therefore strm->next_in must be initialized before
1058    calling inflateBack().  If strm->next_in is Z_NULL, then in() will be called
1059    immediately for input.  If strm->next_in is not Z_NULL, then strm->avail_in
1061    initially be taken from strm->next_in[0 ..  strm->avail_in - 1].
1068      On return, inflateBack() will set strm->next_in and strm->avail_in to
1075    using strm->next_in which will be Z_NULL only if in() returned an error.  If
1076    strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
1077    non-zero.  (in() will always be called before out(), so strm->next_in is