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/*
 * This file is part of preppie.
 *
 * Copyright (C) 2010  Mikhail Zabaluev <mikhail.zabaluev@gmail.com>
 *
 * This work is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This work 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301  USA
 */

#include "map.h"


SprepGenMap *
sprep_gen_map_new ()
{
        return g_new0 (SprepGenMap, 1);
}

void
sprep_gen_map_destroy (SprepGenMap *map)
{
        int i;

        for (i = 0; i < SPREP_PAGE_TABLE_SIZE; i++) {
                const SprepGenMapping **mappings = map->pages[i].mappings;
                if (mappings != NULL) {
                        g_free (mappings);
                }
        }

        g_free (map);
}

void
sprep_gen_map_add (SprepGenMap *map,
                   gunichar key,
                   const SprepGenMapping *value)
{
        const SprepGenMapping **mappings;
        guint ptable_index;
        guint mapping_index;

        g_return_if_fail (key <= SPREP_UNICHAR_MAX);

        ptable_index = key >> SPREP_PAGE_SIZE_SHIFT;

        mappings = map->pages[ptable_index].mappings;

        if (mappings == NULL) {
                mappings = g_new0 (const SprepGenMapping *, SPREP_PAGE_SIZE);
                map->pages[ptable_index].mappings = mappings;
        }

        mapping_index = key & SPREP_PAGE_INDEX_MASK;

        if (G_UNLIKELY (mappings[mapping_index] != NULL
                        && mappings[mapping_index] != value)) {
                g_warning ("remapping for character <U+%04X>", (guint) key);
        }

        mappings[mapping_index] = value;
}

gsize
sprep_gen_map_prepare_layout (SprepGenMap *map)
{
        guint next_offset = SPREP_PAGE_TABLE_SIZE;
        int i;

        for (i = 0; i < SPREP_PAGE_TABLE_SIZE; i++) {
                if (map->pages[i].mappings != NULL) {
                        map->pages[i].offset = next_offset;
                        next_offset += SPREP_PAGE_SIZE;
                }
        }

        return next_offset;
}