/* Copyright (C) 2001-2023 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied,
   modified or distributed except as expressly authorized under the terms
   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/


/* 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(gs_error_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(gs_error_invalidfileaccess));
            if (!(s->modes & s_mode_seek))
                return_error(gs_error_ioerror);
            data_source_init_stream(&params.DataSource, s);
            break;
        }
        default:
            return_error(gs_error_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(gs_error_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(gs_error_rangecheck));
}
