/* Copyright (C) 2001-2006 artofcode LLC.
   All Rights Reserved.
  
  This file is part of GNU ghostscript

  GNU ghostscript is free software; you can redistribute it and/or
  modify it under the terms of the version 2 of the GNU General Public
  License as published by the Free Software Foundation.

  GNU ghostscript is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with
  ghostscript; see the file COPYING. If not, write to the Free Software Foundation,
  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

*/

/* $Id: zfunc0.c,v 1.6 2007/08/01 14:26:52 jemarch Exp $ */
/* PostScript language interface to FunctionType 0 (Sampled) Functions */
#include "memory_.h"
#include "ghost.h"
#include "oper.h"
#include "gsdsrc.h"
#include "gsfunc.h"
#include "gsfunc0.h"
#include "stream.h"		/* for files.h */
#include "files.h"
#include "ialloc.h"
#include "idict.h"
#include "idparam.h"
#include "ifunc.h"

/* Check prototype */
build_function_proc(gs_build_function_0);

/* Finish building a FunctionType 0 (Sampled) function. */
int
gs_build_function_0(i_ctx_t *i_ctx_p, const ref *op, const gs_function_params_t * mnDR,
		    int depth, gs_function_t ** ppfn, gs_memory_t *mem)
{
    gs_function_Sd_params_t params;
    ref *pDataSource;
    int code;

    *(gs_function_params_t *) & params = *mnDR;
    params.Encode = params.Decode = NULL;
    params.pole = NULL;
    params.Size = params.array_step = params.stream_step = NULL;
    if ((code = dict_find_string(op, "DataSource", &pDataSource)) <= 0)
	return (code < 0 ? code : gs_note_error(e_rangecheck));
    switch (r_type(pDataSource)) {
	case t_string:
	    data_source_init_string2(&params.DataSource,
				     pDataSource->value.const_bytes,
				     r_size(pDataSource));
	    break;
	case t_file: {
	    stream *s;

	    check_read_known_file_else(s, pDataSource, return_error,
				       return_error(e_invalidfileaccess));
	    if (!(s->modes & s_mode_seek))
		return_error(e_ioerror);
	    data_source_init_stream(&params.DataSource, s);
	    break;
	}
	default:
	    return_error(e_rangecheck);
    }
    if ((code = dict_int_param(op, "Order", 1, 3, 1, &params.Order)) < 0 ||
	(code = dict_int_param(op, "BitsPerSample", 1, 32, 0,
			       &params.BitsPerSample)) < 0 ||
	((code = fn_build_float_array(op, "Encode", false, true, &params.Encode, mem)) != 2 * params.m && (code != 0 || params.Encode != 0)) ||
	((code = fn_build_float_array(op, "Decode", false, true, &params.Decode, mem)) != 2 * params.n && (code != 0 || params.Decode != 0))
	) {
	goto fail;
    } {
	int *ptr = (int *)
	    gs_alloc_byte_array(mem, params.m, sizeof(int), "Size");

	if (ptr == 0) {
	    code = gs_note_error(e_VMerror);
	    goto fail;
	}
	params.Size = ptr;
	code = dict_ints_param(mem, op, "Size", params.m, ptr);
	if (code != params.m)
	    goto fail;
    }
    code = gs_function_Sd_init(ppfn, &params, mem);
    if (code >= 0)
	return 0;
fail:
    gs_function_Sd_free_params(&params, mem);
    return (code < 0 ? code : gs_note_error(e_rangecheck));
}
