/* 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.
*/


/* CID-keyed font utilities */
#include "ghost.h"
#include "oper.h"
#include "gsmatrix.h"
#include "gxfcid.h"
#include "bfont.h"
#include "icid.h"
#include "idict.h"
#include "idparam.h"
#include "ifcid.h"
#include "store.h"

/* Get the CIDSystemInfo of a CIDFont. */
int
cid_font_system_info_param(gs_cid_system_info_t *pcidsi, const ref *prfont)
{
    ref *prcidsi;

    if (dict_find_string(prfont, "CIDSystemInfo", &prcidsi) <= 0)
        return_error(gs_error_rangecheck);
    return cid_system_info_param(pcidsi, prcidsi);
}

/* Get the additional information for a CIDFontType 0 or 2 CIDFont. */
int
cid_font_data_param(os_ptr op, gs_font_cid_data *pdata, ref *pGlyphDirectory)
{
    int code;
    ref *pgdir;

    check_type(*op, t_dictionary);
    if ((code = cid_font_system_info_param(&pdata->CIDSystemInfo, op)) < 0 ||
        (code = dict_int_param(op, "CIDCount", 0, max_int, -1,
                               &pdata->CIDCount)) < 0
        )
        return code;
    /* Start by assigning the highest CID to be the count of CIDs. */
    pdata->MaxCID = pdata->CIDCount + 1;
    /*
     * If the font doesn't have a GlyphDirectory, GDBytes is required.
     * If it does have a GlyphDirectory, GDBytes may still be needed for
     * CIDMap: it's up to the client to check this.
     */
    if (dict_find_string(op, "GlyphDirectory", &pgdir) <= 0) {
        /* Standard CIDFont, require GDBytes. */
        make_null(pGlyphDirectory);
        return dict_int_param(op, "GDBytes", 1, MAX_GDBytes, 0,
                              &pdata->GDBytes);
    }
    if (r_has_type(pgdir, t_dictionary) || r_is_array(pgdir)) {
        int index;
        ref element[2];

        /* GlyphDirectory, GDBytes is optional. */
        *pGlyphDirectory = *pgdir;
        code = dict_int_param(op, "GDBytes", 0, MAX_GDBytes, 0,
                              &pdata->GDBytes);

        /* If we have a GlyphDirectory then the maximum CID is *not* given by
         * the number of CIDs in the font. We need to know the maximum CID
         * when copying fonts, so calculate and store it now.
         */
        if (r_has_type(pgdir, t_dictionary)) {
            index = dict_first(pgdir);
            while (index >= 0) {
                index = dict_next(pgdir, index, (ref *)&element);
                if (index >= 0) {
                    if (element[0].value.intval > pdata->MaxCID)
                        pdata->MaxCID = element[0].value.intval;
                }
            }
        }
        else {
            pdata->MaxCID = r_size(pgdir) - 1;
        }
        return code;
    } else {
        return_error(gs_error_typecheck);
    }
}
