/* Copyright (C) 1994, 1995, 1996, 1997 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: srlx.h,v $ $Revision: 1.2.2.2 $ */
/* Definitions for RunLength filters */
/* Requires scommon.h; strimpl.h if any templates are referenced */

#ifndef srlx_INCLUDED
#  define srlx_INCLUDED

/* Common state */
#define stream_RL_state_common\
	stream_state_common;\
	bool EndOfData		/* true if 128 = EOD */

/* RunLengthEncode */
typedef struct stream_RLE_state_s {
    stream_RL_state_common;
    /* The following parameters are set by the client. */
    ulong record_size;
    /* The following change dynamically. */
    ulong record_left;		/* bytes left in current record */
    int copy_left;		/* # of bytes waiting to be copied */
} stream_RLE_state;

#define private_st_RLE_state()	/* in srle.c */\
  gs_private_st_simple(st_RLE_state, stream_RLE_state, "RunLengthEncode state")
/* We define the initialization procedure here, so that clients */
/* can avoid a procedure call. */
#define s_RLE_set_defaults_inline(ss)\
  ((ss)->EndOfData = true, (ss)->record_size = 0)
#define s_RLE_init_inline(ss)\
  ((ss)->record_left =\
   ((ss)->record_size == 0 ? ((ss)->record_size = max_uint) :\
    (ss)->record_size),\
   (ss)->copy_left = 0)
extern const stream_template s_RLE_template;

/* RunLengthDecode */
typedef struct stream_RLD_state_s {
    stream_RL_state_common;
    /* The following change dynamically. */
    int copy_left;		/* # of output bytes waiting to be produced */
    int copy_data;		/* -1 if copying, repeated byte if repeating */
} stream_RLD_state;

#define private_st_RLD_state()	/* in srld.c */\
  gs_private_st_simple(st_RLD_state, stream_RLD_state, "RunLengthDecode state")
/* We define the initialization procedure here, so that clients */
/* can avoid a procedure call. */
#define s_RLD_set_defaults_inline(ss)\
  ((ss)->EndOfData = true)
#define s_RLD_init_inline(ss)\
  ((ss)->min_left = ((ss)->EndOfData ? 1 : 0), (ss)->copy_left = 0)
extern const stream_template s_RLD_template;

#endif /* srlx_INCLUDED */
