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/* Copyright (C) 1993, 2000 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: sfilter.h,v 1.8 2002/02/21 22:24:54 giles Exp $ */
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/* Definitions for simple Ghostscript streams */
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/* Requires scommon.h; should require strimpl.h only if any templates */
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/* are referenced, but some compilers always require strimpl.h. */
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#ifndef sfilter_INCLUDED
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# define sfilter_INCLUDED
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#include "gstypes.h" /* for gs_[const_]string */
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/*
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* Define the processing states of the simplest Ghostscript streams.
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* We use abbreviations for the stream names so as not to exceed the
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* 31-character limit that some compilers put on identifiers.
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*
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* The processing state of a stream has three logical sections:
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* parameters set by the client before the stream is opened,
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* values computed from the parameters at initialization time,
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* and values that change dynamically. Unless otherwise indicated,
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* all structure members change dynamically.
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*/
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/* eexecEncode */
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typedef struct stream_exE_state_s {
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stream_state_common;
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/* The following parameters are set by the client. */
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ushort cstate; /* encryption state */
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} stream_exE_state;
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#define private_st_exE_state() /* in sfilter1.c */\
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gs_private_st_simple(st_exE_state, stream_exE_state, "eexecEncode state")
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extern const stream_template s_exE_template;
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/* eexecDecode */
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typedef struct stream_PFBD_state_s stream_PFBD_state;
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typedef struct stream_exD_state_s {
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stream_state_common;
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/* The following parameters are set by the client. */
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ushort cstate; /* encryption state */
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int binary; /* 1=binary, 0=hex, -1=don't know yet */
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int lenIV; /* # of initial decoded bytes to skip */
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stream_PFBD_state *pfb_state; /* state of underlying */
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/* PFBDecode stream, if any */
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/* The following change dynamically. */
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int odd; /* odd digit */
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long record_left; /* data left in binary record in .PFB file, */
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/* max_long if not reading a .PFB file */
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long hex_left; /* # of encoded chars to process as hex */
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/* if binary == 0 */
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int skip; /* # of decoded bytes to skip */
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} stream_exD_state;
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#define private_st_exD_state() /* in seexec.c */\
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gs_private_st_ptrs1(st_exD_state, stream_exD_state, "eexecDecode state",\
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exd_enum_ptrs, exd_reloc_ptrs, pfb_state)
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extern const stream_template s_exD_template;
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/* PFBDecode */
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/* The typedef for the state appears under eexecDecode above. */
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/*typedef */ struct stream_PFBD_state_s {
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stream_state_common;
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/* The following parameters are set by the client. */
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int binary_to_hex;
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/* The following change dynamically. */
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int record_type;
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ulong record_left; /* bytes left in current record */
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} /*stream_PFBD_state */ ;
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#define private_st_PFBD_state() /* in sfilter1.c */\
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gs_private_st_simple(st_PFBD_state, stream_PFBD_state, "PFBDecode state")
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extern const stream_template s_PFBD_template;
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/* SubFileDecode */
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typedef struct stream_SFD_state_s {
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stream_state_common;
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/* The following parameters are set by the client. */
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long count; /* # of chars or EODs to scan over */
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gs_const_string eod;
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long skip_count; /* # of initial chars or records to skip */
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/* The following change dynamically. */
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uint match; /* # of matched chars not copied to output */
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uint copy_count; /* # of matched characters left to copy */
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uint copy_ptr; /* index of next character to copy */
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} stream_SFD_state;
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#define private_st_SFD_state() /* in sfilter1.c */\
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gs_private_st_const_strings1(st_SFD_state, stream_SFD_state,\
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"SubFileDecode state", sfd_enum_ptrs, sfd_reloc_ptrs, eod)
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extern const stream_template s_SFD_template;
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#endif /* sfilter_INCLUDED */
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