/* Copyright (C) 2001-2020 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.,  1305 Grant Avenue - Suite 200, Novato,
   CA 94945, U.S.A., +1(415)492-9861, for further information.
*/


/* DCTEncode filter creation */
#include "memory_.h"
#include "stdio_.h"		/* for jpeglib.h */
#include "jpeglib_.h"
#include "ghost.h"
#include "oper.h"
#include "gsmemory.h"
#include "ialloc.h"
#include "idict.h"
#include "idparam.h"
#include "strimpl.h"
#include "sdct.h"
#include "sjpeg.h"
#include "ifilter.h"
#include "iparam.h"

/* Import the parameter processing procedure from sdeparam.c */
stream_state_proc_put_params(s_DCTE_put_params, stream_DCT_state);

/* <target> <dict> DCTEncode/filter <file> */
static int
zDCTE(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_memory_t *mem = gs_memory_stable(imemory);
    stream_DCT_state state;
    dict_param_list list;
    jpeg_compress_data *jcdp;
    int code;
    const ref *dop;
    uint dspace;

    /* First allocate space for IJG parameters. */
    jcdp = gs_alloc_struct_immovable(mem, jpeg_compress_data,
      &st_jpeg_compress_data, "zDCTE");
    if (jcdp == 0)
        return_error(gs_error_VMerror);
    state.memory = mem;
    if (s_DCTE_template.set_defaults)
        (*s_DCTE_template.set_defaults) ((stream_state *) & state);
    state.data.compress = jcdp;
    jcdp->memory = state.jpeg_memory = mem;	/* set now for allocation */
    state.report_error = filter_report_error;	/* in case create fails */
    if ((code = gs_jpeg_create_compress(&state)) < 0)
        goto fail;		/* correct to do jpeg_destroy here */
    /* Read parameters from dictionary */
    if (r_has_type(op, t_dictionary))
        dop = op, dspace = r_space(op);
    else
        dop = 0, dspace = 0;
    if ((code = dict_param_list_read(&list, dop, NULL, false, iimemory)) < 0)
        goto fail;
    if ((code = s_DCTE_put_params((gs_param_list *) & list, &state)) < 0)
        goto rel;
    /* Create the filter. */
    jcdp->templat = s_DCTE_template;
    /* Make sure we get at least a full scan line of input. */
    state.scan_line_size = jcdp->cinfo.input_components *
        jcdp->cinfo.image_width;
    state.icc_profile = NULL;
    jcdp->templat.min_in_size =
        max(s_DCTE_template.min_in_size, state.scan_line_size);
    /* Make sure we can write the user markers in a single go. */
    jcdp->templat.min_out_size =
        max(s_DCTE_template.min_out_size, state.Markers.size);
    code = filter_write(i_ctx_p, 0, &jcdp->templat,
                        (stream_state *) & state, dspace);
    if (code >= 0)		/* Success! */
        return code;
    /* We assume that if filter_write fails, the stream has not been
     * registered for closing, so s_DCTE_release will never be called.
     * Therefore we free the allocated memory before failing.
     */
rel:
    iparam_list_release(&list);
fail:
    gs_jpeg_destroy(&state);
    gs_free_object(mem, jcdp, "zDCTE fail");
    return code;
}

/* ------ Initialization procedure ------ */

const op_def zfdcte_op_defs[] =
{
    op_def_begin_filter(),
    {"2DCTEncode", zDCTE},
    op_def_end(0)
};