/* Portions Copyright (C) 2001 artofcode LLC.
   Portions Copyright (C) 1996, 2001 Artifex Software Inc.
   Portions Copyright (C) 1988, 2000 Aladdin Enterprises.
   This software is based in part on the work of the Independent JPEG Group.
   All Rights Reserved.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/ or
   contact Artifex Software, Inc., 101 Lucas Valley Road #110,
   San Rafael, CA  94903, (415)492-9861, for further information. */

/*$RCSfile: srlx.h,v $ $Revision: 1.8 $ */
/* 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 */
