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/* Copyright (C) 1994, 1995, 1996, 1997 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: srlx.h,v 1.5 2002/02/21 22:24:54 giles Exp $ */
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/* Definitions for RunLength filters */
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/* Requires scommon.h; strimpl.h if any templates are referenced */
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#ifndef srlx_INCLUDED
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# define srlx_INCLUDED
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/* Common state */
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#define stream_RL_state_common\
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stream_state_common;\
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bool EndOfData /* true if 128 = EOD */
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/* RunLengthEncode */
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typedef struct stream_RLE_state_s {
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stream_RL_state_common;
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/* The following parameters are set by the client. */
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ulong record_size;
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/* The following change dynamically. */
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ulong record_left; /* bytes left in current record */
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int copy_left; /* # of bytes waiting to be copied */
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} stream_RLE_state;
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#define private_st_RLE_state() /* in srle.c */\
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gs_private_st_simple(st_RLE_state, stream_RLE_state, "RunLengthEncode state")
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/* We define the initialization procedure here, so that clients */
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/* can avoid a procedure call. */
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#define s_RLE_set_defaults_inline(ss)\
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((ss)->EndOfData = true, (ss)->record_size = 0)
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#define s_RLE_init_inline(ss)\
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((ss)->record_left =\
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((ss)->record_size == 0 ? ((ss)->record_size = max_uint) :\
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(ss)->record_size),\
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(ss)->copy_left = 0)
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extern const stream_template s_RLE_template;
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/* RunLengthDecode */
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typedef struct stream_RLD_state_s {
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stream_RL_state_common;
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/* The following change dynamically. */
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int copy_left; /* # of output bytes waiting to be produced */
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int copy_data; /* -1 if copying, repeated byte if repeating */
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} stream_RLD_state;
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#define private_st_RLD_state() /* in srld.c */\
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gs_private_st_simple(st_RLD_state, stream_RLD_state, "RunLengthDecode state")
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/* We define the initialization procedure here, so that clients */
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/* can avoid a procedure call. */
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#define s_RLD_set_defaults_inline(ss)\
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((ss)->EndOfData = true)
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#define s_RLD_init_inline(ss)\
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((ss)->min_left = ((ss)->EndOfData ? 1 : 0), (ss)->copy_left = 0)
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extern const stream_template s_RLD_template;
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#endif /* srlx_INCLUDED */
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