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/* Copyright (C) 1994, 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: zfdctd.c,v 1.8 2002/02/21 22:24:54 giles Exp $ */
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/* DCTDecode filter creation */
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#include "memory_.h"
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#include "stdio_.h" /* for jpeglib.h */
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#include "jpeglib_.h"
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#include "ghost.h"
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#include "oper.h"
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#include "gsmalloc.h" /* for gs_memory_default */
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#include "strimpl.h"
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#include "sdct.h"
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#include "sjpeg.h"
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#include "ialloc.h"
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#include "ifilter.h"
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#include "iparam.h"
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private_st_jpeg_decompress_data();
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/* Import the parameter processing procedure from sddparam.c */
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stream_state_proc_put_params(s_DCTD_put_params, stream_DCT_state);
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/* <source> <dict> DCTDecode/filter <file> */
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/* <source> DCTDecode/filter <file> */
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private int
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zDCTD(i_ctx_t *i_ctx_p)
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{
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os_ptr op = osp;
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gs_memory_t *mem = (gs_memory_t *)(i_ctx_p->memory.current);
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stream_DCT_state state;
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dict_param_list list;
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jpeg_decompress_data *jddp;
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int code;
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const ref *dop;
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uint dspace;
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/* First allocate space for IJG parameters. */
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jddp = gs_alloc_struct_immovable(mem,jpeg_decompress_data,
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&st_jpeg_decompress_data, "zDCTD");
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if (jddp == 0)
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return_error(e_VMerror);
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if (s_DCTD_template.set_defaults)
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(*s_DCTD_template.set_defaults) ((stream_state *) & state);
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state.data.decompress = jddp;
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jddp->memory = state.jpeg_memory = mem; /* set now for allocation */
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jddp->scanline_buffer = NULL; /* set this early for safe error exit */
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state.report_error = filter_report_error; /* in case create fails */
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if ((code = gs_jpeg_create_decompress(&state)) < 0)
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goto fail; /* correct to do jpeg_destroy here */
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/* Read parameters from dictionary */
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if (r_has_type(op, t_dictionary))
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dop = op, dspace = r_space(op);
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else
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dop = 0, dspace = 0;
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if ((code = dict_param_list_read(&list, dop, NULL, false, iimemory)) < 0)
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goto fail;
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if ((code = s_DCTD_put_params((gs_param_list *) & list, &state)) < 0)
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goto rel;
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/* Create the filter. */
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jddp->template = s_DCTD_template;
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code = filter_read(i_ctx_p, 0, &jddp->template,
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(stream_state *) & state, dspace);
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if (code >= 0) /* Success! */
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return code;
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/*
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* We assume that if filter_read fails, the stream has not been
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* registered for closing, so s_DCTD_release will never be called.
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* Therefore we free the allocated memory before failing.
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*/
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rel:
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iparam_list_release(&list);
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fail:
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gs_jpeg_destroy(&state);
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gs_free_object(mem, jddp, "zDCTD fail");
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return code;
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}
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/* ------ Initialization procedure ------ */
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const op_def zfdctd_op_defs[] =
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{
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op_def_begin_filter(),
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{"2DCTDecode", zDCTD},
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op_def_end(0)
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};
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