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/* Copyright (C) 1995, 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: zfzlib.c,v 1.5 2002/02/21 22:24:54 giles Exp $ */
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/* zlib and Flate filter creation */
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#include "ghost.h"
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#include "oper.h"
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#include "idict.h"
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#include "strimpl.h"
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#include "spdiffx.h"
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#include "spngpx.h"
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#include "szlibx.h"
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#include "idparam.h"
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#include "ifilter.h"
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#include "ifrpred.h"
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#include "ifwpred.h"
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/* Common setup for zlib (Flate) filter */
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private int
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filter_zlib(i_ctx_t *i_ctx_p, stream_zlib_state *pzls)
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{
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os_ptr op = osp;
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int code = 0;
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(*s_zlibE_template.set_defaults)((stream_state *)pzls);
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if (r_has_type(op, t_dictionary))
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code = dict_int_param(op, "Effort", -1, 9, -1, &pzls->level);
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return code;
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}
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/* <source> zlibEncode/filter <file> */
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/* <source> <dict> zlibEncode/filter <file> */
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private int
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zzlibE(i_ctx_t *i_ctx_p)
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{
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stream_zlib_state zls;
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int code = filter_zlib(i_ctx_p, &zls);
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if (code < 0)
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return code;
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return filter_write(i_ctx_p, 0, &s_zlibE_template, (stream_state *)&zls, 0);
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}
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/* <target> zlibDecode/filter <file> */
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/* <target> <dict> zlibDecode/filter <file> */
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private int
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zzlibD(i_ctx_t *i_ctx_p)
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{
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stream_zlib_state zls;
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(*s_zlibD_template.set_defaults)((stream_state *)&zls);
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return filter_read(i_ctx_p, 0, &s_zlibD_template, (stream_state *)&zls, 0);
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}
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/* <source> FlateEncode/filter <file> */
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/* <source> <dict> FlateEncode/filter <file> */
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private int
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zFlateE(i_ctx_t *i_ctx_p)
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{
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stream_zlib_state zls;
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int code = filter_zlib(i_ctx_p, &zls);
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if (code < 0)
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return code;
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return filter_write_predictor(i_ctx_p, 0, &s_zlibE_template,
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(stream_state *)&zls);
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}
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/* <target> FlateDecode/filter <file> */
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/* <target> <dict> FlateDecode/filter <file> */
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private int
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zFlateD(i_ctx_t *i_ctx_p)
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{
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stream_zlib_state zls;
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(*s_zlibD_template.set_defaults)((stream_state *)&zls);
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return filter_read_predictor(i_ctx_p, 0, &s_zlibD_template,
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(stream_state *)&zls);
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}
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/* ------ Initialization procedure ------ */
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const op_def zfzlib_op_defs[] =
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{
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op_def_begin_filter(),
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{"1zlibEncode", zzlibE},
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{"1zlibDecode", zzlibD},
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{"1FlateEncode", zFlateE},
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{"1FlateDecode", zFlateD},
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op_def_end(0)
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};
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