1 /* Copyright (C) 1994, 1995, 1996, 1997 Aladdin Enterprises. All rights reserved. 2 3 This software is provided AS-IS with no warranty, either express or 4 implied. 5 6 This software is distributed under license and may not be copied, 7 modified or distributed except as expressly authorized under the terms 8 of the license contained in the file LICENSE in this distribution. 9 10 For more information about licensing, please refer to 11 http://www.ghostscript.com/licensing/. For information on 12 commercial licensing, go to http://www.artifex.com/licensing/ or 13 contact Artifex Software, Inc., 101 Lucas Valley Road #110, 14 San Rafael, CA 94903, U.S.A., +1(415)492-9861. 15 */ 16 17 /* $Id: srlx.h,v 1.5 2002/02/21 22:24:54 giles Exp $ */ 18 /* Definitions for RunLength filters */ 19 /* Requires scommon.h; strimpl.h if any templates are referenced */ 20 21 #ifndef srlx_INCLUDED 22 # define srlx_INCLUDED 23 24 /* Common state */ 25 #define stream_RL_state_common\ 26 stream_state_common;\ 27 bool EndOfData /* true if 128 = EOD */ 28 29 /* RunLengthEncode */ 30 typedef struct stream_RLE_state_s { 31 stream_RL_state_common; 32 /* The following parameters are set by the client. */ 33 ulong record_size; 34 /* The following change dynamically. */ 35 ulong record_left; /* bytes left in current record */ 36 int copy_left; /* # of bytes waiting to be copied */ 37 } stream_RLE_state; 38 39 #define private_st_RLE_state() /* in srle.c */\ 40 gs_private_st_simple(st_RLE_state, stream_RLE_state, "RunLengthEncode state") 41 /* We define the initialization procedure here, so that clients */ 42 /* can avoid a procedure call. */ 43 #define s_RLE_set_defaults_inline(ss)\ 44 ((ss)->EndOfData = true, (ss)->record_size = 0) 45 #define s_RLE_init_inline(ss)\ 46 ((ss)->record_left =\ 47 ((ss)->record_size == 0 ? ((ss)->record_size = max_uint) :\ 48 (ss)->record_size),\ 49 (ss)->copy_left = 0) 50 extern const stream_template s_RLE_template; 51 52 /* RunLengthDecode */ 53 typedef struct stream_RLD_state_s { 54 stream_RL_state_common; 55 /* The following change dynamically. */ 56 int copy_left; /* # of output bytes waiting to be produced */ 57 int copy_data; /* -1 if copying, repeated byte if repeating */ 58 } stream_RLD_state; 59 60 #define private_st_RLD_state() /* in srld.c */\ 61 gs_private_st_simple(st_RLD_state, stream_RLD_state, "RunLengthDecode state") 62 /* We define the initialization procedure here, so that clients */ 63 /* can avoid a procedure call. */ 64 #define s_RLD_set_defaults_inline(ss)\ 65 ((ss)->EndOfData = true) 66 #define s_RLD_init_inline(ss)\ 67 ((ss)->min_left = ((ss)->EndOfData ? 1 : 0), (ss)->copy_left = 0) 68 extern const stream_template s_RLD_template; 69 70 #endif /* srlx_INCLUDED */ 71